Diana Saleiro

IIT Research Institute (IITRI), Chicago, Illinois, United States

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Publications (7)41.1 Total impact

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    ABSTRACT: Various epidemiological studies have shown that a regular and moderate consumption of red wine is correlated with a decreased relative risk of developing coronary heart disease and cancer. These health benefits are commonly attributed to high contents of polyphenols, particularly resveratrol, representing important sources of antioxidants. However, resveratrol does not seem to be the only bioactive compound present in the wine which contains numerous other polyphenols. The present study investigates the efficiency of red wine extracts (RWEs), containing different polyphenols, on colon cancer cell proliferation in vitro and on colonic aberrant crypt foci (ACF) in vivo. Proliferation, cell cycle analysis and incidence of ACF were monitored to examine the effects of RWEs. RWEs derived from a long vinification process exhibit superior anti-proliferative activity in colon cancer cells and prevent the appearance of ACF in mice. Interestingly, quercetin and resveratrol, representing two major bio-active polyphenols, exhibit synergistic anti-proliferative effects. These data suggest that the efficacy of RWEs on colon carcinogenesis may depend on the polyphenolic content, synergistic interaction of bio-active polyphenols and modulation of cellular uptake of polyphenols.
    No preview · Article · Feb 2014
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    ABSTRACT: Estrogen receptor-beta (ERβ) has been suggested to exert anti-inflammatory and anti-tumorigenic effects in the colon, providing a translational potential to prevent and/or treat inflammatory bowel disease (IBD) and its progression to colitis-associated colorectal cancer (CAC). However, the specific direct role of ERβ in CAC has not yet been tested. We assessed the effects of ERβ deficiency in the azoxymethane (AOM)/dextran sodium sulfate (DSS)-induced CAC model using ERβ knockout (βERKO) mice and wild-type (WT) littermates. These mice were injected with AOM followed by 1 week of DSS treatment, and sacrificed on weeks 9 or 16. βERKO mice developed more severe clinical colitis compared to WT mice, as evidenced by significantly higher disease activity index after DSS treatment, weight to length ratio of the colons, inflammation score and grade of dysplasia. ERβ-deficient colons presented greater number and size of polyps at weeks 9 and 16, respectively, and were characterized by a significant increase in interleukin (IL)-6, IL-17, tumor necrosis factor alpha and interferon-gamma mRNA levels. Furthermore, higher protein expression levels of nuclear factor-kappa B, inducible nitric oxide synthase, β-catenin, proliferating cell nuclear antigen, mucin-1 and significantly lower caveolin-1 and mucin-2 protein levels were shown in βERKO mice compared to WT mice. These data suggest a possible anti-inflammatory and anti-neoplastic mechanism of action of ERβ in CAC. These results demonstrate for the first time that ERβ provides protection in the AOM/DSS-induced CAC model in mice, suggesting a preventive and/or therapeutic potential for the use of ERβ-selective agonists in IBD.
    Full-text · Article · Dec 2012 · International Journal of Cancer

  • No preview · Article · Jun 2012 · Cancer Research
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    ABSTRACT: In this study, the relative toxicity of native gold-silica nanoshells (NS) has been compared to nanoshells modified with poly(ethylene glycol)-thiol (PEG-SH) and a Raman-active PEG, p-mercaptoaniline-poly(ethylene glycol) (pMA-PEG), in mouse alveolar macrophage cell cultures (RAW 264.7). The results from toxicity profiling using an MTT assay demonstrate that cell viability post-particle exposure is a function of three factors: nanoshell concentration, surface functionalization, and incubation time. By minimizing particle concentrations and incubation times, cell cultures are able to recover within 24 h of nanoshell removal, indicative of nanoshells having more of a cytostatic versus cytotoxic effect on macrophage cells. The mechanism of the cytostatic effect has been investigated by imaging the presence of reactive oxygen species (ROS) using a fluorescence assay kit (Image-iT™ LIVE) after the introduction of NS to the cell cultures. Elevated ROS signals are seen in the cells containing higher concentration of NS, and indicate that the major reason of toxicity may due to the oxidative stress caused by excess NS particles. Raman imaging experiments with pMA-PEG coated nanoshells showed that cells exposed for even short exposure times (∼2 h) retained those particles up to 24 h after exposure, while migration experiments suggest that surviving cells retain their nanoshells and may reallocate them to progeny cells upon cell division.
    Full-text · Article · Aug 2011 · Metallomics

  • No preview · Article · Apr 2011 · Cancer Research
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    ABSTRACT: The role of the estrogen receptor beta (ERbeta) in the colon has received considerable interest, yet in vivo models are needed to better define its protective actions. In the present study, wild-type (WT), ERalpha, and ERbeta knockout (alphaERKO and betaERKO) mice were injected with azoxymethane, a colon chemical carcinogen. Fourteen weeks after azoxymethane exposure, the incidence of aberrant crypt foci (ACF) was assessed by methylene blue staining. betaERKO mice showed significantly higher incidence (P < 0.001) of ACF (15.0 +/- 2.5) compared with alphaERKO (3.4 +/- 1.0) and WT (4.6 +/- 1.0) mice. The colons in several betaERKO mice had increased thickness and loss of normal morphology. It has been reported that ERbeta plays a role in the maintenance of the colonic crypt architecture; this may explain the loss of crypt organization in the colonic epithelium of betaERKO mice. The presence of mucin-depleted foci (MDF) has been shown, both in humans and in rodents, as an early event in colon cancer. Therefore, to surpass the limitations with ACF scoring, we performed Alcian blue-neutral red staining to assess the presence of MDF. This assay allowed the assessment of precancerous lesions on all the betaERKO mice colons (38.3 +/- 4.0; P < 0.001), comparing to WT and alphaERKO mice (6.6 +/- 1.5 and 10.0 +/- 1.9, respectively), and served to confirm the ACF results. Together, these data support the use of MDF staining as a biomarker for precancerous lesions and the protective role of ERbeta in colon carcinogenesis.
    Full-text · Article · Sep 2010 · Cancer Prevention Research

  • No preview · Article · Apr 2010 · Cancer Research