ArticlePDF Available

Can Cancer Trigger Autoimmunity?

Authors:

Abstract

A chronic autoimmune disease sometimes appears coincidently in patients with cancer. [Also see Research Article by Joseph et al. ]
DOI: 10.1126/science.1249486
, 147 (2014);343 Science
Michele W. L. Teng and Mark J. Smyth
Can Cancer Trigger Autoimmunity?
This copy is for your personal, non-commercial use only.
clicking here.colleagues, clients, or customers by , you can order high-quality copies for yourIf you wish to distribute this article to others
here.following the guidelines can be obtained byPermission to republish or repurpose articles or portions of articles
): January 9, 2014 www.sciencemag.org (this information is current as of
The following resources related to this article are available online at
http://www.sciencemag.org/content/343/6167/147.full.html
version of this article at: including high-resolution figures, can be found in the onlineUpdated information and services,
http://www.sciencemag.org/content/343/6167/147.full.html#related
found at: can berelated to this article A list of selected additional articles on the Science Web sites
http://www.sciencemag.org/content/343/6167/147.full.html#ref-list-1
, 2 of which can be accessed free:cites 8 articlesThis article
registered trademark of AAAS. is aScience2014 by the American Association for the Advancement of Science; all rights reserved. The title CopyrightAmerican Association for the Advancement of Science, 1200 New York Avenue NW, Washington, DC 20005.
(print ISSN 0036-8075; online ISSN 1095-9203) is published weekly, except the last week in December, by theScience
on January 9, 2014www.sciencemag.orgDownloaded from on January 9, 2014www.sciencemag.orgDownloaded from on January 9, 2014www.sciencemag.orgDownloaded from
www.sciencemag.org SCIENCE VOL 343 10 JANUARY 2014 147
PERSPECTIVES
Autoimmune diseases occur when
immune B and T cells fail to distin-
guish the body’s own proteins as self
and attack them, ultimately damaging tissues
and organs. There are many possible causes
of autoimmune diseases, such as chemical
exposures, infections, and genetic factors.
On page 152 of this issue, Joseph et al. ( 1)
raise another possibility—nascent growing
cancers might express new proteins (neoanti-
gens) whose exposure to the immune system
creates the potential for an autoimmune dis-
ease to develop.
Systemic sclerosis (scleroderma) is a
rare chronic autoimmune rheumatic dis-
ease associated with fi brosis of the skin and
widespread destruction of blood vessels that
affects organs, with life-threatening conse-
quences. Some rheumatic diseases are also
paraneoplastic—they are present with can-
cers—and removal of the tumor or its medi-
cal treatment causes regression of the clini-
cal manifestations. Coincidental timing of
scleroderma and cancer had been observed
in patients with autoantibodies specifi c for
RNA polymerase III subunit (RPC1) ( 2).
Joseph et al. examined tumor tissue and
blood samples from 16 scleroderma patients
with various types of cancer. Among the
eight patients who had anti-RPC1 autoanti-
bodies and coincident cancer, six had genetic
mutations—either somatic mutations or
loss of heterozygosity (only one copy of an
allele) in POLR3A (polymerase III polypep-
tide A, the gene encoding RPC1) (see the
gure, below). The other eight patients had
autoantibodies to either topoisomerase 1
(anti-TOP1) or centromere protein B (anti-
CENPB) and developed delayed cancer.
Interestingly, all the anti-RPC1 anti-
bodies recognized wild-type and mutated
RPC1, indicating that the humoral immune
response does not directly target the area
of the mutation or discriminate between
mutant and wild-type versions of RPC1.
But some patients with scleroderma who
possessed defi ned POLR3A mutations had
T cells that reacted to RPC1 protein frag-
ments produced from the mutated gene. The
reactivity was specific to the patient and
peptide, but the frequencies of these T cells
were comparable to those observed in other
autoimmune diseases. Given that POLR3A
mutations are exceedingly rare in cancer
(0.7% overall), it is unlikely that the onset
Can Cancer Trigger Autoimmunity?
CANCER
Michele W. L. Teng
1, 2 and Mark J. Smyth
1 ,2
A chronic autoimmune disease sometimes
appears coincidently in patients with cancer.
1Cancer Immunoregulation and Immunotherapy and Immu-
nology in Cancer and Infection Laboratories, QIMR Berg-
hofer Medical Research Institute, 300 Herston Road, Her-
ston, 4006 Queensland, Australia. 2School of Medicine,
University of Queensland, Herston, 4006 Queensland, Aus-
tralia. E-mail: mark.smyth@qimrberghofer.edu.au
during axonal growth and/or migration ( 5).
As neurons of different types and origins
adopt different strategies to polarize ( 6), it
will be interesting to explore whether apical
shedding is a marginal or widespread mecha-
nism in neurogenesis.
During mitosis of apical progenitors in the
mouse cortex, a ciliary remnant associates
with the centrosome at one pole of the mitotic
spindle, resulting in asymmetric inheritance
of a ciliary structure ( 7). Thus, the cilium is
partly conserved rather than dismantled dur-
ing cell division. The cell inheriting the cili-
ary remnant rapidly reconstitutes an apical
cilium and is more likely to retain apical pro-
genitor identity. Its sister produces a basolat-
eral cilium, a phenomenon associated with
basal progenitor identity. Basal progenitors’
restricted capacity to proliferate may result
from the reduced exposure of the basolat-
eral cilium to luminal mitogens ( 8). Future
research should address whether apical shed-
ding is also present in the developing cortex,
where indirect neurogenesis, through basal
progenitors, is predominant, and how shed-
ding integrates with asymmetric ciliary recy-
cling and basolateral cilia formation.
The cortex and neural tube appear to have
a remarkable plasticity of ciliary structures
during neurogenesis. Although mechanisti-
cally different, asymmetric recycling of cili-
ary remnants ( 7), differential positioning of
cilia ( 8), and dismantling of the cilium and
shedding of the ciliary membrane are many
ways for a cell to modulate the timing and
dosage of its exposure to environmental sig-
nals. These new layers of control in signal
reception are independent of the source con-
centration and may therefore contribute to the
diversity of cell fate decisions, allowing pro-
gression of neural differentiation and mainte-
nance of a pool of apical progenitors to occur
simultaneously in a niche.
References
1. R. M. Das, K. G. Storey, Science 343, 200 (2014).
2. R. M. Das, K. G. Storey, EMBO Rep. 13, 448 (2012).
3. D. L. Rousso et al., Neuron 74, 314 (2012).
4. J. P. Thiery, H. Acloque, R. Y. Huang, M. A. Nieto, Cell
139, 871 (2009).
5. P. L. Cheng, M. M. Poo, Annu. Rev. Neurosci. 35, 181
(2012).
6. Y. Hatanaka, K. Yamauchi, F. Murakami, Dev. Growth
Differ. 54, 398 (2012).
7. J. T. Paridaen, M. Wilsch-Bräuninger, W. B. Huttner, Cell
155, 333 (2013).
8. M. Wilsch-Bräuninger, J. Peters, J. T. Paridaen, W. B.
Huttner, Development 139, 95 (2012).
10.1126/science.1249497
POLR3A mutation or loss
of heterozygosity
Autoantibodies
Severe
Coincident Delayed,
~14 years later Not detectable
(occult? cured? never?)
Less severe ?
?
Anti-RPC1
Ant i-TOP1
or anti-CENPB
Scleroderma
Cancer
Yes
Anti-RPC1 Anti-RPC1
NoNo
Severe
Coincident
Coincidence. Four subsets of scleroderma patients
are shown (as observed by Joseph et al. (1)) with dif-
ferent autoantibody profi les, mutations, and coin-
cident cancer.
CREDIT: V. ALTOUNIAN/SCIENCE
Published by AAAS
10 JANUARY 2014 VOL 343 SCIENCE www.sciencemag.org
148
PERSPECTIVES
of scleroderma and the cancer genomes of
these patients were unrelated, and that the
mutations, and T cell responses directed
against them, were coincidental. Rather,
POLR3A mutation in the occasional cancer
triggers the scleroderma.
According to cancer immunoediting ( 3),
the host can control tumor growth through
innate and adaptive immune mechanisms.
Genetic instability in the tumor may cre-
ate neoantigens that are recognized by the
immune system, leading to the selection of
tumor cells that can escape immune pres-
sure. Neoantigens have been demonstrated in
tumors by means of epitope prediction algo-
rithms ( 4). These principles have been dem-
onstrated in mouse models of carcinogenesis
and multistage cancer progression ( 3, 4), but
also recently, the importance of a patient’s
immune reaction with cancer in dictating
disease-free survival (immune contexture)
has been established ( 5).
The relatively low fraction of neoplas-
tic cells with genetic alterations in the can-
cers from some of the scleroderma patients
studied by Joseph et al. suggests that cancer
immunoediting had occurred. Cancer cells
targeted by T cells appear to selectively lose
the mutant allele, and loss of heterozygos-
ity occurred in most of the tumors that were
present synchronously with the scleroderma.
In some tumors, the loss of heterozygosity
was not yet complete (clonal heterogene-
ity was observed in which a small percent-
age of the tumor cells still carried the muta-
tion). Presumably, if those tumors had been
sampled a few months later, there might not
be any detectable mutant cells because loss
of heterozygosity would have been com-
plete. The loss of heterozygosity in the other
tumors without detectable mutations is quite
possibly a “historical” record of the tumors
once carrying mutations. Interestingly, no
mutant allele or loss of heterozygosity was
detected in some patients with anti-RPC1
autoantibodies, suggesting that other mech-
anisms can induce their production. The eti-
ology of scleroderma development in these
patients may resemble that in patients with
anti-TOP1 and anti-CENPB autoantibod-
ies. It is also possible that patients with
RPC1-specifi c autoantibodies and no can-
cer may once have had nascent cancer or
harbor cancer in a state of immune-medi-
ated dormancy. The loss of heterozygos-
ity of POLR3A in some patients raises the
possibility that immunoediting may involve
gene copy-number alterations in the cancer.
Alternatively, because RPC1 plays a role in
sensing and limiting infection by intracellu-
lar bacteria and viruses ( 6), cancer may also
Second-closest to Jupiter (after Io) of
the four large Galilean satellites,
icy Europa is one of the strangest
objects in the solar system ( 1). On page 171
of this issue, Roth et al. ( 2) present strong
evidence for ongoing eruptions of plumes
of water vapor from Europa’s surface. This
is a potentially major discovery, making
Europa only the fourth object in the solar
system known to exhibit ongoing internally
powered geological activity, after Earth,
Europa’s volcanic neighbor moon Io, and
Saturn’s icy moon Enceladus.
Europa is slightly smaller than our own
Moon, with a radius of 1561 km and a density
of 3010 kg m–3, implying an interior mostly
composed of silicates plus about 10% water
by mass. Gravity observations by the Gali-
leo Jupiter orbiter revealed that Europa is
strongly differentiated, with the lower-density
water component concentrated near the sur-
face ( 3). The surface is dominated by water
ice, along with other hydrated species, proba-
bly salts. Europa’s surface appearance is truly
bizarre, crisscrossed with fractures, some-
times global in extent, that on closer inspec-
tion turn out to be double ridges (see the fi g-
Glimpsing Eruptions on Europa
PLANETARY SCIENCE
John R. Spencer
Recent observations with the Hubble Space Telescope reveal what are probably eruptions of water
vapor from Jupiter’s moon Europa.
Southwest Research Institute, 1050 Walnut Street, Boulder,
CO 80302, USA. E-mail: spencer@boulder.swri.edu
mutate or lose POLR3A to evade activating
innate immunity.
The association between cancer and rheu-
matic diseases has been intriguing for many
years ( 7). Paraneoplastic syndromes may
be mediated by autoantibodies due either to
tumor antigens that are also expressed by
cells targeted by the autoimmune disease or
to the release of intracellular antigens from
apoptotic tumor cells ( 8). However, these
responses are directed to the normal pro-
tein, and there is yet no evidence that encod-
ing genes were mutated in the tumors. Joseph
et al. extend causation to include mutant
POLR3A in human tumors that elicits an
immune response against the mutant RPC1
but cross-reacts with the normal RPC1,
resulting in autoimmunity. However, the can-
cer mutation is likely not enough and addi-
tional factors (genetic, environmental, or
target tissue–specific) may be required to
generate damage to normal tissue.
From an epidemiological viewpoint, the
study by Joseph et al. is underpowered, but
these fi ndings may also prompt research into
whether antigens other than RPC1 might
trigger autoimmunity (e.g., in myositis and
lupus). In larger studies, mining exome
sequencing data can help identify a patient’s
specifi c tumor antigen profi le and potential
tumor immunity and autoimmunity. How-
ever, the fi ndings by Joseph et al. raise inter-
esting issues about tumors with high mutation
rates (lung, melanoma) or microsatellite DNA
instability (colorectal) and their predisposi-
tion to cause autoimmunity. Simple analysis
of large tissue collections from cancer patients
with accompanying “immunoscores” and
patient disease history might reveal correla-
tions with autoimmune syndromes.
Very little autoimmunity has been caus-
ally linked to cancer mutations and subse-
quent immune reactions, but these events
have only been examined in cancer patients
with clinically detectable disease. Do autoim-
mune patients in general have an undetectable
burden or history of cancer? New immuno-
therapeutic treatments for cancer that break
tolerance will help to clarify the underlying
natural human immune reaction to cancer and
its side effects on normal tissues.
References and Notes
1. C. G. Joseph et al., Science 343, 152 (2014); 10.1126/
science.1246886.
2. A. A. Shah, A. Rosen, L. Hummers, F. Wigley, L. Casciola-
Rosen, Arthritis Rheum. 62, 2787 (2010).
3. R. D. Schreiber, L. J. Old, M. J. Smyth, Science 331, 1565
(2011).
4. H. Matsushita et al., Nature 482, 400 (2012).
5. J. Galon et al., Science 313, 1960 (2006).
6. A. Ablasser et al., Nat. Immunol. 10, 1065 (2009).
7. J. E. Naschitz, Curr. Opin. Rheumatol. 13, 62 (2001).
8. M. L. Albert, R. B. Darnell, Nat. Rev. Cancer 4, 36 (2004)
.
Acknowledgments: M.W.L.T is supported by a CDF1 Fellow-
ship and Project Grant from the National Health and Medical
Research Council of Australia (NH&MRC) and Prostate Cancer
Foundation of Australia. M.J.S. is supported by a NH&MRC
Australia Fellowship and Program Grant, and Program Grant
from the Susan G. Komen for the Cure.
10.1126/science.1249486
Published by AAAS
... Wykazano, że nowotwory związane z SSc z anty-RNAP III zawierają zmutowane formy autoantygenu polimerazy III RNA [25]. Wysunięto także hipotezę, według której nowotwór działa jak czynnik wyzwalający autoimmunizację ze względu na mechanizmy związane z odpornością przeciwnowotworową, mimikrą molekularną i rozprzestrzenianiem się epitopów [26,27]. ...
... Tumors associated with RNAP III positive SSc have been shown to harbor mutated forms of RNA polymerase III autoantigen [25]. Malignancy has been hypothesized to act as a trigger of autoimmunity due to mechanisms involving antitumor immunity, molecular mimicry and epitope spreading [26,27]. ...
Article
Full-text available
Patients with systemic sclerosis are at 1.5-5-fold increased risk of developing malignant diseases. It has been shown that some types of antinuclear antibodies associated with systemic sclerosis may have predictive value for development of malignant diseases in patients with systemic sclerosis. Patients with circulating anti-RNA polymerase III antibodies (RNAP) are at significantly increased risk of developing a malignant disease (breast cancer, followed by leukemias and gastrointestinal or gynecologic cancers) within 36 months from the onset of the disease (OR = 7.38). Thus, regular cancer screening is recommended in anti-RNAP III-positive patients. An increased prevalence of lung cancer was reported in patients with circulating anti-topoisomerase I antibodies (11.4%) compared to the median of 2.4% in all patients with systemic sclerosis. Among patients with circulating anti-centromere antibodies, individuals who are anti-CENP-F-positive are at increased risk of developing breast cancer or lung cancer. Anti-PM-Scl antibodies and anti-Ku antibodies are rare in systemic sclerosis, but may have some association with increased risk of malignancy in these patients as well. Thus, recent data indicate that in patients with systemic sclerosis, diverse disease-specific antinuclear antibodies may be associated with increased risk of developing malignant tumors and require especially careful preventive cancer screening.
... These antibodies can, for example, be induced by intracellular antigens released from apoptotic tumor cells [5] or by mutated proteins that elicit antibodies cross-reacting to the non-mutated counterparts. For instance, antibodies against a tumor-specific mutant of RNA polymerase III subunit (RPC1) were shown to cross-react with normal RPC1, thereby contributing to the autoimmune disease scleroderma [6,7]. To date, over 100 autoantibody specificities have been identified in various neoplastic diseases, with potential uses in diagnosis and treatment [8]. ...
Article
Full-text available
The link between cancer and autoimmunity is well-established. For example, increased levels of autoantibodies are frequently found in cancer patients, and autoimmune diseases are linked to an increased risk for certain neoplasms. However, the extent to which chemotherapy induces autoimmune reactions remains largely elusive. Here, we quantified immunoglobulin M (IgM) responses to various human tissues and the patient's tumor before and during adjuvanted chemotherapy (seven cycles of the FOLFIRI regimen (folinic acid/fluorouracil/irinotecan) plus cetuximab) of a patient with metastasized colon cancer. IgM levels against all investigated tissues increased shortly after the first cycle and were further boosted by cycles two and three. Autoimmune responses then decreased during cycles four to seven but remained above baseline levels for most tissues. Our findings suggest that chemotherapy can induce broadly reactive autoimmune responses. Monitoring self-reactive IgM responses during treatment may help alleviate autoimmunity-related adverse events.
... During this response, the immune system performs very efficient biological amplification, using antigenic tumor proteins as templates. Very small amounts of antigen can be indirectly detected [3][4][5][6]. It is interesting to note that a considerable number of autoantibodies is shared by autoimmune diseases and cancer. ...
Article
Full-text available
Colorectal cancer represents a paradigmatic model of inflammatory carcinogenesis accompanied by the production of several kinds of tumor-associated autoantibodies (TAABs). The specific aim of this study is to define the clinical impact of the presence of non-specific circulating TAABs in a cohort of cancer patients and to establish whether significant differences were present between colorectal cancer and cancers at other sites. For this aim a prospective study was developed and a five-year survival analysis performed. Indirect immunofluorescence on rat tissues for non-organ specific autoantibodies (NOSAs: liver-kidney-stomach), on rat colon substrates (colon-related autoantibodies, CAAs) and on HEp-2 cell lines was performed. NOSA positivity was more frequent in patients with colorectal cancer than in those with cancer at other sites. Survival analysis demonstrated a significantly worse prognosis in cancer patients positive for TAABs. CAA positivity is a predictor of survival, independently from the presence of comorbidities, and HEp-2 reactivity was a strong predictor of survival in a stepwise Cox-regression model, including stage at diagnosis. Overall overproduction of TAABs is associated with advanced oncological disease, the presence of metastasis, and poorer prognosis of cancer patients.
... Currently, immune-based therapies are attracting more and more attention in cancer treatment [71]. A variety of cancer immunotherapies, including vaccines and adoptive cell transfer, have been clinically applied [72]. ...
Article
Full-text available
Autophagy is an evolutionarily conserved catabolic process by which cellular components are sequestered into a double-membrane vesicle and delivered to the lysosome for terminal degradation and recycling. Accumulating evidence suggests that autophagy plays a critical role in cell survival, senescence and homeostasis, and its dysregulation is associated with a variety of diseases including cancer, cardiovascular disease, neurodegeneration. Recent studies show that autophagy is also an important regulator of cell immune response. However, the mechanism by which autophagy regulates tumor immune responses remains elusive. In this review, we will describe the role of autophagy in immune regulation and summarize the possible molecular mechanisms that are currently well documented in the ability of autophagy to control cell immune response. In addition, the scientific and clinical hurdles regarding the potential role of autophagy in cancer immunotherapy will be discussed.
... 78 Much remains to be learned about this relationship including the alternative possibility that cancer may trigger autoimmunity. 79 ...
Article
The incidence of thyroid cancer has almost doubled in recent years and over 60,000 people will be diagnosed in the US in 2015. While the prognosis for most such patients is excellent, a significant proportion die of thyroid cancer from local tumor progression and above all from metastases. Here we review the different types of thyroid cancers and their molecular changes with a special emphasis on the currently known susceptibility and precipitating factors. With the recent clinical introduction of tyrosine kinase inhibitors for the treatment of metastatic thyroid cancer it is clear that a simple cure is not at hand and further understanding of the molecular mechanisms of these tumors is urgently needed.
Article
Full-text available
Cancer immunotherapies are changing the landscape of cancer care. Intratumoral talimogene iaherparepvec (T-VEC), an oncolytic viral vaccine, has been approved for treatment of unresectable melanoma with minimal toxicity. We describe the first case of a centenarian who developed autoimmune diabetes while on T-VEC immunotherapy. The patient’s high titer of glutamic acid decarboxylase 65 autoantibodies as well as insulin deficiency are consistent with autoimmune diabetes. Autoimmune diabetes has previously been seen following immune checkpoint inhibitor use; however, it has never been reported with T-VEC. This case highlights that autoimmune diabetes can be a rare but morbid complication of intratumoral T-VEC immunotherapy and can occur in the ultra-elderly.
Article
Evidence establishes that chronic inflammation and autoimmunity are associated with cancer development and patients with a primary malignancy may develop autoimmune-like diseases. Despite immune dysregulation is a common feature of both cancer and autoimmune diseases, precise mechanisms underlying this susceptibility are not clarified and different hypotheses have been proposed, starting from genetic and environmental common features, to intrinsic properties of immune system. Moreover, as the development and use of immunomodulatory therapies for cancer and autoimmune diseases are increasing, the elucidation of this relationship must be investigated in order to offer the best and most secure therapeutic options. The microbiota could represent a potential link between autoimmune diseases and cancer. The immunomodulation role of microbiota is widely recognized and under eubiosis, it orchestrates both the innate and adaptive response of immunity, in order to discriminate and modulate the immune response itself in the most appropriate way. Therefore, a dysbiotic status can alter the immune tonus rendering the host prone to exogenous or endogenous infections, breaking the tolerance against self-components and activating the immune responses in an excessive (i.e. chronic inflammation) or deficient way, favoring the onset of neoplastic and autoimmune diseases.
Article
A checklist of recent freshwater Japanese endemic diatom taxa was compiled. 427 recent freshwater diatom taxa have been described from Japan. 122 taxa are reported only from Japan and should be endemic. 29 taxa were reported from both Japan and other East Asian countries. 204 taxa have never been used since their first description and are regarded as ‘Practically Non-existent Species (PNS)’ and omitted from the analysis.
Article
Much has been learned recently about the role of immunoglobulins as effector molecules of the adaptive immunity and as active elements in the maintenance of immune homeostasis. The increasing number of pathologies where intravenous immunoglobulins (IVIg) display a beneficial action illustrates their therapeutic relevance. Considering recent findings on the ability of IVIg to modulate macrophage polarization, herein we review evidences on the antitumoral activity of IVIg. Fragmentary and nonconclusive, available evidences are just suggestive of the potential of IVIg in antitumoral therapy, but encourage for the generation of additional evidences through well-designed clinical trials, and for additional studies to address the molecular effects of IVIg as a means to avoid the extrapolation of data gathered from animal models.
Thesis
Full-text available
Science and more especially biomedicine, is still impaired by approaches and methods that have previously and in certain settings proved useful, but also showed since then clear limitations. Reductionism and the classical experimental method are good tools within their proper domain of validity, as any other tools. This domain of validity is the domain of linearity, and proportionality, particularly when it comes to the concept of causality : A causes B, and most of the time, in a relationship of proportionality. In this work, we show that reductionism and classical experiment methods, as inherited from the philosophical and practical views of Descartes and Bernard, led in many cases to dead-ends. 3 examples are chosen and studied : the difference between normal and pathological in infectious diseases, the existence of groups in sociology, and the identification of nosologic entities in mental health. We explain that another way of thinking is possible, thanks an analysis in terms of forms and functions, which we name a morphodynamical approach. In such an approach, we treat in equal respects both the form and the principles that determine this form. Invoking a morphodynamical approach for solving complex problems calls for theoretical and technical developments, so that it does not remain a pure wish. We therefore suggest to review three main theoretical framework that could provide formal elements to build our theory of morphodynamics, namely, the quantum-like frameworks, the relativistic-like and the system dynamics-like ones. We also present the practical techniques that support each type of framework. We end this work by presenting the detailed blue prints of a unified theoretical framework for morphodynamics, based on geometry and information. This framework relies on the use of an informational automaton such as a bayesian network, and the co-construction of what we term its associated informational space. This space is structured by a metric, built from the form of the automaton. From a relativistic point of view, we postulate that the informational space is shaped by its local informational content, as well as the local information flow. The adaptation of an existing algorithm is presented, that can determine the geodesic paths of the informational space.
Article
Full-text available
Neurogenesis in the vertebrate embryo involves the production of neurons through asymmetric divisions of neuroepithelial progenitors, also known as apical progenitors. The coordination of intrinsic transcriptional events, reception of external stimuli, and cellular remodeling that accompany neuronal birth is still far from being understood. On page 200 of this issue, Das and Storey ( 1 ) provide insight into this process and describe an unexpected cell remodeling process called apical abscission.
Article
Full-text available
Autoimmune diseases are thought to be initiated by exposures to foreign antigens that cross-react with endogenous molecules. Scleroderma is an autoimmune connective tissue disease in which patients make antibodies to a limited group of autoantigens, including RPC1, encoded by the POLR3A gene. As patients with scleroderma and antibodies against RPC1 are at increased risk for cancer, we hypothesized that the “foreign” antigens in this autoimmune disease are encoded by somatically mutated genes in the patients’ incipient cancers. Studying cancers from scleroderma patients, we found genetic alterations of the POLR3A locus in six of eight patients with antibodies to RPC1 but not in eight patients without antibodies to RPC1. Analyses of peripheral blood lymphocytes and serum suggested that POLR3A mutations triggered cellular immunity and cross-reactive humoral immune responses. These results offer insight into the pathogenesis of scleroderma and provide support for the idea that acquired immunity helps to control naturally occurring cancers.
Article
Full-text available
Cancer immunoediting, the process by which the immune system controls tumour outgrowth and shapes tumour immunogenicity, is comprised of three phases: elimination, equilibrium and escape. Although many immune components that participate in this process are known, its underlying mechanisms remain poorly defined. A central tenet of cancer immunoediting is that T-cell recognition of tumour antigens drives the immunological destruction or sculpting of a developing cancer. However, our current understanding of tumour antigens comes largely from analyses of cancers that develop in immunocompetent hosts and thus may have already been edited. Little is known about the antigens expressed in nascent tumour cells, whether they are sufficient to induce protective antitumour immune responses or whether their expression is modulated by the immune system. Here, using massively parallel sequencing, we characterize expressed mutations in highly immunogenic methylcholanthrene-induced sarcomas derived from immunodeficient Rag2(-/-) mice that phenotypically resemble nascent primary tumour cells. Using class I prediction algorithms, we identify mutant spectrin-β2 as a potential rejection antigen of the d42m1 sarcoma and validate this prediction by conventional antigen expression cloning and detection. We also demonstrate that cancer immunoediting of d42m1 occurs via a T-cell-dependent immunoselection process that promotes outgrowth of pre-existing tumour cell clones lacking highly antigenic mutant spectrin-β2 and other potential strong antigens. These results demonstrate that the strong immunogenicity of an unedited tumour can be ascribed to expression of highly antigenic mutant proteins and show that outgrowth of tumour cells that lack these strong antigens via a T-cell-dependent immunoselection process represents one mechanism of cancer immunoediting.
Article
Full-text available
RNA is sensed by Toll-like receptor 7 (TLR7) and TLR8 or by the RNA helicases LGP2, Mda5 and RIG-I to trigger antiviral responses. Much less is known about sensors for DNA. Here we identify a novel DNA-sensing pathway involving RNA polymerase III and RIG-I. In this pathway, AT-rich double-stranded DNA (dsDNA) served as a template for RNA polymerase III and was transcribed into double-stranded RNA (dsRNA) containing a 5'-triphosphate moiety. Activation of RIG-I by this dsRNA induced production of type I interferon and activation of the transcription factor NF-kappaB. This pathway was important in the sensing of Epstein-Barr virus-encoded small RNAs, which were transcribed by RNA polymerase III and then triggered RIG-I activation. Thus, RNA polymerase III and RIG-I are pivotal in sensing viral DNA.
Article
Full-text available
The role of the adaptive immune response in controlling the growth and recurrence of human tumors has been controversial. We characterized the tumor-infiltrating immune cells in large cohorts of human colorectal cancers by gene expression profiling and in situ immunohistochemical staining. Collectively, the immunological data (the type, density, and location of immune cells within the tumor samples) were found to be a better predictor of patient survival than the histopathological methods currently used to stage colorectal cancer. The results were validated in two additional patient populations. These data support the hypothesis that the adaptive immune response influences the behavior of human tumors. In situ analysis of tumor-infiltrating immune cells may therefore be a valuable prognostic tool in the treatment of colorectal cancer and possibly other malignancies.
Article
Understanding how the immune system affects cancer development and progression has been one of the most challenging questions in immunology. Research over the past two decades has helped explain why the answer to this question has evaded us for so long. We now appreciate that the immune system plays a dual role in cancer: It can not only suppress tumor growth by destroying cancer cells or inhibiting their outgrowth but also promote tumor progression either by selecting for tumor cells that are more fit to survive in an immunocompetent host or by establishing conditions within the tumor microenvironment that facilitate tumor outgrowth. Here, we discuss a unifying conceptual framework called “cancer immunoediting,” which integrates the immune system’s dual host-protective and tumor-promoting roles.
Article
This study was undertaken to examine the temporal relationship between scleroderma development and malignancy, and to evaluate whether this differs by autoantibody status among affected patients. Study participants had a diagnosis of scleroderma, a diagnosis of cancer, cancer, an available serum sample, and a cancer pathology specimen. Sera were tested for autoantibodies against topoisomerase I, centromere, and RNA polymerase I/III by immunoprecipitation and/or enzyme-linked immunosorbent assay. Clinical and demographic characteristics were compared across autoantibody categories. Expression of RNA polymerases I and III was evaluated by immunohistochemistry using cancerous tissue from patients with anti-RNA polymerase antibodies. Twenty-three patients were enrolled. Six patients tested positive for anti-RNA polymerase I/III, 5 for anti-topoisomerase I, and 8 for anticentromere, and 4 were not positive for any of these antigens. The median duration of scleroderma at cancer diagnosis differed significantly between groups (-1.2 years in the anti-RNA polymerase I/III group, +13.4 years in the anti-topoisomerase I group, +11.1 years in the anticentromere group, and +2.3 years in the group that was negative for all antigens tested) (P = 0.027). RNA polymerase III demonstrated a robust nucleolar staining pattern in 4 of 5 available tumors from patients with antibodies to RNA polymerase I/III. In contrast, nucleolar RNA polymerase III staining was not detected in any of 4 examined tumors from the RNA polymerase antibody-negative group (P = 0.048). Our findings indicate that there is a close temporal relationship between the onset of cancer and scleroderma in patients with antibodies to RNA polymerase I/III, which is distinct from scleroderma patients with other autoantibody specificities. In this study, autoantibody response and tumor antigen expression are associated. We propose that malignancy may initiate the scleroderma-specific immune response and drive disease in a subset of scleroderma patients.
Article
Rheumatic disorders associated with cancer include a variety of conditions, most of which have no features distinguishing them from idiopathic rheumatic disorders. It is generally held that an extensive search for occult malignancy in most rheumatic syndromes is not recommended unless the case is accompanied by specific findings suggestive of malignancy. Within the past year information has accumulated on the role of long-standing rheumatic disorders as premalignant conditions and the role of autoantibodies as screening tests for occult cancer. The present article discusses cancer-associated rheumatic syndromes, calls attention to aspects that may suggest the presence of a hidden cancer, and examines the role of laboratory tests as clues of a possible neoplastic etiology of those syndromes.
Article
Paraneoplastic neurological degenerations (PNDs) are neurological disorders that develop in patients with cancer. PNDs are triggered by an effective antitumour immune response against neuronal antigens that are expressed in cancer cells, which subsequently develops into autoimmune neurodegenerative disease. Studying patients with PND has offered the opportunity to gain unique insights into mechanisms of tumour immunity and has provided the potential to apply this knowledge to patients with cancer in general.
  • J Galon
J. Galon et al., Science 313, 1960 (2006).