[Show abstract][Hide abstract] ABSTRACT: The mammalian E2F family of transcription factors comprises a group of 8 proteins, which either activate or repress transcription of numerous target genes, playing a role in cell-cycle progression and apoptosis. We have collectively investigated the immunohistochemical expression of E2F1, E2F2, and E2F4 transcription factors and their relation to cell kinetic parameters using serial section analysis in a series of 100 cases of human colorectal adenocarcinomas. E2F1 and E2F4 expressed nuclear immunopositivity in all cases. The range of their expression was 2% to 80% (mean 21%±15%) and 2% to 90% (mean 66%±20%), respectively. E2F2 was expressed in 41 cases at low levels (range, 1% to 5%, mean 2%±9%). A statistically significant direct association between E2F4 and cell proliferation, as expressed by high levels of Ki-67 labeling index, was shown. A mutually exclusive immunostaining pattern between E2F1 and E2F4 and a direct correlation of E2F1 and apoptosis were also highlighted. Our results point to a possible direct tumor-promoting role for E2F4 in the context of colorectal carcinogenesis. The inverse immunohistochemical relationship between E2F1 and E2F4 indicates a possible mechanistic interlink in colorectal cancer. Low expression of E2F2 may reflect functional redundancy between members of the E2F family, in this case between E2F1 and E2F2.
Applied immunohistochemistry & molecular morphology: AIMM / official publication of the Society for Applied Immunohistochemistry 06/2012; 22(6). DOI:10.1097/PAI.0b013e3182598198 · 2.01 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Vascular endothelial growth factor (VEGF) seems to be a critical molecule in cervical carcinogenesis. We aimed to investigate the possible associations between hormonal factors and VEGF expression in cervical epithelial cells from postmenopausal women.
A total of 105 healthy postmenopausal women (aged 45-68 years old) attending a university menopause clinic were enrolled in this cross-sectional study. Pap smears were derived from current users of 17β-estradiol 1 mg + norethisterone acetate 0.5 mg (n = 28), tibolone 2.5 mg (n = 23), raloxifene HCl 60 mg (n = 21) and women not receiving treatment (n = 33). VEGF immunostaining was evaluated in squamous, glandular and metaplastic cells, using a semiquantitative method (rating scale: 0-3).
Concerning endogenous hormones, higher Δ4-androstenedione levels were associated with more intense VEGF immunostaining in glandular (p = 0.041) and metaplastic cells (p = 0.004). Hormone therapy and raloxifene did not induce any changes in VEGF immunoreactivity in the examined cells. In contrast, tibolone administration was accompanied by diminished VEGF presence in metaplastic cells (p = 0.016 vs. controls).
Our findings may in part reflect the molecular processes contributing to the safe profile of hormone therapy, tibolone and raloxifene in cervical carcinogenesis.
[Show abstract][Hide abstract] ABSTRACT: Overexpression of Epidermal Growth Factor Receptor (EGFR) and also of cell cycle control proteins, such as cyclin D1 is a frequent event in squamous cell carcinoma of the larynx (LSSC). Our aim was to correlate their protein levels with telomerase catalytic subunit (h-TERT) expression. Using tissue microarray technology, fifty-five paraffin embedded histologically confirmed primary LSSCs and also ten dysplastic lesions were cored at a diameter of 1.5 mm. Immunohistochemistry (IHC) was performed by the use of anti-EGFR, anti-cyclin D1, and anti-h TERT monoclonal antibodies. Chromogenic in situ hybridization (CISH) analysis was also applied using EGFR gene and chromosome 7 probes, respectively. EGFR, cyclin D1 and h-TERT protein overexpression was observed in 48/55 (87.2%), 19/55 (34.5%) and 21/55 (38.1%) carcinoma cases, respectively. EGFR protein expression was statistically associated with grade (P=0.01), and also with stage (P=0.001) of the examined tumors. Borderline statistical significance was assessed correlating overall cyclin D1 expression to h TERT expression (P=0.06). Simultaneous up regulation of the three proteins was established in 7/55 (12.7%) cases, correlated to the stage of the tumors (P=0.05). EGFR gene amplification was observed in 7/65 (10.7%) carcinomas and dysplasias, whereas chromosome 7 aneuploidy was detected in 4/65 (6.1%) of those cases.Simultaneous up regulation of EGFR, cyclin D1 and h TERT proteins correlates with advanced stage in LSCC. EGFR gene amplification and not only protein over expression maybe is the eligible criterion for targeted therapeutic strategies in those patients.
Medical Oncology 04/2010; 28(3):871-7. DOI:10.1007/s12032-010-9522-3 · 2.63 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Background: Several studies showed serum markers elevation as a result to coronary angiography. We investigated the effect of diagnostic coronary angiography (DCA) on the development of systemic inflammatory response syndrome (SIRS) and on whole blood cytokine production capacity after ex-vivo LPS stimulation. Methods: In this observational study, clinical characteristics and serum cytokines of the patients were recorded at baseline and at 2, 6, 12, and 24h after DCA. Peripheral blood was collected at baseline and at 2, and 24h for complete blood count, coagulation profile and ex-vivo (100 microl) stimulation with LPS (500 pg) for subsequent cytokine measurement. Values are expressed as median+/-IQR and were compared using Wilcoxon's signed rank test with Bonferroni adjustment. Results: We included 23 male patients (mean age 52.0+/-18.0 years) undergoing DCA. None of the patients developed clinical or laboratory signs of SIRS. Serum IL-6 significantly increased at 12h. There was a significant decrease in TNF-alpha production after ex-vivo LPS stimulation of whole blood at 2 and 24h compared to baseline (median+/-IQR; 716.0+/-319.0; 576.0+/-715.0 vs. 1154+/-844.0 pg/ml; respectively) suggesting that DCA may cause transient endotoxin tolerance. Conclusions: DCA is related to increased serum IL-6 levels but does not cause clinical SIRS. Development of SIRS after DCA is indicative of other in origin complication. DCA is associated with immune cells hyporesponsiveness, possibly through monocyte depression, expressed as decreased TNF-alpha production after whole blood stimulation with LPS ex vivo.
[Show abstract][Hide abstract] ABSTRACT: Epithelial cadherin (E-cadherin), a transmembrane glycoprotein involved in calcium-dependent homophilic cell-cell adhesion, is expressed aberrantly during cervical carcinogenesis. E-cadherin expression and putatively implicated predictors in healthy women remain a rather under-investigated area. The objective of this study is to evaluate the possible associations between E-cadherin expression and reproductive/lifestyle factors in cervical epithelial cells from postmenopausal women.
A total of 105 healthy postmenopausal women (aged 45-68 years old) attending a university menopause clinic were enrolled in this cross-sectional study. Pap smears were derived and E-cadherin immunostaining was evaluated in squamous, glandular and squamous metaplastic cells, using a semi-quantitative method (rating scale: 0-3). Reproductive and lifestyle factors were obtained from patients' chart review.
In squamous cells, women with a history of 0-1 deliveries presented with a higher score vs women with 2-4 deliveries (P = 0.003). Social drinkers and women drinking alcohol daily exhibited a higher E-cadherin immunostaining score in squamous cells vs non-drinkers (0.96 +/- 0.72 vs 0.56 +/- 0.65, P = 0.004). A higher dietary calcium intake was marginally correlated with a lower staining score in squamous cells (0.94 +/- 0.78 for low, 0.71 +/- 0.70 for average, 0.45 +/- 0.52 for high consumption, P = 0.073).
E-cadherin expression seems to be associated with reproductive history and lifestyle habits in squamous cervical cells from healthy postmenopausal women. E-cadherin might participate in the molecular mechanisms underlying the role of parity as a risk factor for cervical cancer.
Journal of Obstetrics and Gynaecology Research 01/2009; 34(6):1043-8. DOI:10.1111/j.1447-0756.2008.00824.x · 1.07 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: To establish a potential correlation between renal and systemic production of vascular endothelial growth factor (VEGF) protein after prolonged ischemia in a renal ablation model under normothermic and hypothermic conditions.
38 uninephrectomized New Zealand rabbits were divided into 5 groups. The rabbits of each group underwent partial nephrectomy under 90 and 60 min of warm and 90 and 120 min of cold ischemia, except for the sham group (S), which served as control. Serum creatinine (SCr) and blood-urea-nitrogen (BUN) levels were assessed. On the 15th postoperative day (POD), the animals were euthanized and the remaining kidneys were evaluated. VEGF immunohistochemistry and serum Western blot analysis were performed.
In comparison to the control group, groups 60W, 90C and 120C showed 1.6-, 1.14- and 1.75-fold decreases, respectively, while the production of VEGF was significantly declined by 7.4-fold in group 90W (p < 0.05). Immunohistochemistry revealed prominent VEGF staining in the above-mentioned three groups, while in group 90W staining was negative. Serum biochemistry and microscopic evaluation verified the same differentiation.
Renal and serum VEGF seem to have an analogous expression under conditions of prolonged ischemia. VEGF is overexpressed in hypothermic conditions compared to warm ischemia exceeding 60 min. Hypothermia can be more advantageous in a procedure applying prolonged ischemia.
American Journal of Nephrology 01/2008; 28(3):438-45. DOI:10.1159/000112809 · 2.67 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The aim of this study was to investigate the patterns of renal function recovery during partial nephrectomy (PN) on an experimental solitary kidney rabbit model and establish the upper tolerable time limits of applied ischemia. Forty-eight New Zealand rabbits underwent an open right nephrectomy and after 30 days, the animals were clustered into five groups (A, B, C, D, E). The first four groups received an open left PN, under different types of ischemia. Groups A (n = 8) and B (n = 10) were subjected to 90 and 60 min of warm ischemia (WI), respectively, while groups C (n = 10) and D (n = 10) received 90 and 120 min of cold ischemia (CI) with ice-slush cooling. Group E (n = 10) served as sham group. Serum determinations of creatinine (SCr) and BUN were recorded preoperatively and on postoperative days (POD) 1, 3, 6 and 15. The animals were euthanized and the remaining kidneys were harvested and evaluated microscopically. The type and duration of ischemia were statistically significant parameters (P < 0.001). Groups B, C and D exhibited a similar pattern of recovery from trial initiation to the 15th POD (P = 0.788 and P = 0.068, respectively). Group A was extremely differentiated, with 100% mortality caused by uremia. The microscopic findings were consistent to the serum biochemistry. In our solitary kidney rabbit model, the upper limits of tolerable WI seem to be set on 60 min. CI can safely preserve the model's renal function--even up to 120 min.
World Journal of Urology 01/2008; 25(6):635-40. DOI:10.1007/s00345-007-0214-3 · 2.67 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Deregulation of apoptotic pathways in cutaneous malignant melanoma appears to be correlated with chemoresistance and poor prognosis. Furthermore, telomerase (especially h-TERT) expression induces proliferation and also represents a potential target for vaccination regarding some types of malignancies.
Using tissue microarrays (TMA) technology, 25 paraffin-embedded tissue samples of histologically confirmed malignant melanomas were cored at a diameter of 2 mm and re-embedded into one recipient block (final TMA density 24/25-96%). Immunohistochemistry (IHC) was performed by the use of anti-bcl-2, anti-caspase 3, anti-caspase 8 and anti- h-TERT antibodies. Protein expression levels were evaluated using a computerized image analysis system (CIA). SPSS (chi square test and inter-rater kappa) was used for statistical analysis.
Strong protein expression was observed in 1/24 (4.1%), 1/24 (4.1%), 2/24 (8.2%), and 4/24 (16.4%) cases regarding h-TERT, caspase 3, caspase 8 and bcl-2, respectively. Moderate was observed in 7/24 (29.1%), 8/24 (32.2%), 5/24 (20.2%), and 8/24(32.2%) cases, whereas reduced or absent expression demonstrated 16/24 (65%), 15/24 (60.2%), 17/24 (68.5%), and 12/24 (50 %) cases. Statistical significance was assessed correlating age to caspase 3 (p=0.05), Breslow's thickness to telomerase (p=0.013) and to bcl-2 (p=0.053), Clark's level to telomerase (p=0.008) and to bcl-2 (p=0.022), and finally ulceration to telomerase expression (p=0.007).
bcl-2 and telomerase expression are correlated to critical parameters of malignant melanoma, affecting its biological behavior. Furthermore, downregulation of proteins such as caspases 3/8, which normally induce apoptosis, is perhaps associated with resistance of the applied chemotherapeutic strategies in this type of malignancy.
Journal of B.U.ON.: official journal of the Balkan Union of Oncology 10/2007; 12(4):513-9. · 0.74 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Based on the hypothesis that Fractal Dimension (FD) reflects heterogeneity of tumor tissue, we performed an image analysis study to calculate FD of tissue specimens from patients with laryngeal carcinomas in order to investigate its prognostic value.
Laryngectomy specimens from 52 patients, who had previously undergone total laryngectomy for squamous cell carcinomas, were examined and their history files reviewed. Ten patients were lost from follow-up. Fractal Analysis software was used to estimate FD of histology sections by the box-counting method. FD of carcinomatous areas was correlated with survival.
Patients with a FD lower than the median value of the sample, estimated in sections of carcinomas, had statistically significant higher survival rates.
Within the sample of patients studied, FD could be used as a prognostic factor.
Anticancer research 05/2005; 25(3B):2141-4. · 1.83 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: E2F-1 is a pivotal transcription factor that integrates signals from a variety of G1/S phase regulators and modulates diverse cellular functions, such as DNA synthesis, repair, mitosis, and apoptosis. Its role in cellular proliferation and apoptosis, as depicted from experimental models and limited reports in human malignancies, remains a matter of debate. Recently, in non-small cell lung cancer, it was observed that E2F-1 overexpression was associated with tumour growth, implying an 'oncogenic' effect. To clarify further the role of E2F-1 in carcinogenesis, the investigation was expanded in four of the most common human malignancies by examining its expression status and putative impact on tumour kinetics. These issues were addressed by immunohistochemical and molecular means in 52 breast carcinomas, 42 prostate adenocarcinomas, 58 colon adenocarcinomas, and 77 superficial bladder transitional cell carcinomas (TCCs). The following results were found: (i). in breast carcinomas, E2F-1 expression correlated with proliferation (p < 0.001) and growth index (p = 0.001); (ii). in prostate adenocarcinomas, absence of E2F-1 was noted, in contrast to its expression in normal and hyperplastic glands; (iii). in colon adenocarcinomas, E2F-1 expression was inversely related to growth index (p = 0.001), being expressed in lesions with increased apoptosis (p = 0.001) and low proliferation (p < 0.001); and (iv) in superficial TCCs, E2F-1 expression correlated with proliferation (p = 0.002). Taken together, these results suggest that E2F-1 has a growth-promoting effect in breast carcinomas and superficial TCC, whereas the opposite seems to be the case for colon and prostate cancer. To interpret the above findings, the status of the pRb and p53 tumour suppressor pathways, which are known to affect E2F-1 activity, was further investigated. The results suggest that the actions of E2F-1 are mainly dependent on the functionality of these pathways. Nevertheless, the data also imply that p53-independent pathways may play a nodal role in the function of E2F-1 in colon cancer.
The Journal of Pathology 07/2004; 203(3):744-53. DOI:10.1002/path.1582 · 7.43 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The purpose is to investigate the prophylactic effect of intravesically instillated recombinant IFN-gamma against recurrence of superficial transitional cell carcinoma of the bladder and to evaluate its effect in local immune response, presumably mediating its therapeutic efficacy.
We prospectively randomized in two groups 123 patients with initially diagnosed superficial transitional cell carcinoma and stage Ta, T1, grade 2 tumors, who underwent transurethral tumor resection (TUR). In group A, 60 patients received IFN-gamma (1.5 x 10(7) IU/instillation), whereas 63 patients, consisting of the control group B, received mitomycin C (40 mg/instillation). The annual administration schedule consisted of eight weekly followed by four biweekly and then by eight monthly instillations for both regimens. We also analyzed the immunophenotype of the intratumoral and intramural leukocytes by immunohistochemical and flow-cytometric techniques. To this purpose, tumor samples were obtained at TUR and random biopsies at TUR and during cystoscopy at 6 and 12 months, and bladder washings were collected before TUR and at preselected time points.
In group A, 44 of 60 (73.4%) patients, and in group B, 36 of 63 (57.2%) patients, were tumor free during the median follow-up period of 26.5 months (range, 3-49 months). IFN-gamma was well tolerated. Six months after starting treatment, follicular cystitis was detected in patients responding to IFN-gamma. After IFN-gamma instillations, statistically significant increases in T cells, T-helper cells, T-cytotoxic cells, natural killer cells, and total leukocytes, as well as in the number of B cells expressing intercellular adhesion molecule-1 and total leukocytes expressing HLA-DR, were observed by flow cytometry in tissue specimens and bladder washings.
Recombinant IFN-gamma appears to be effective against stage Ta, T1, grade 2 bladder tumors' recurrence. Recruitment and activation of intramural leukocytes seem to be involved in the mechanism of IFN-gamma action.
Clinical Cancer Research 12/2003; 9(15):5550-8. · 8.72 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: We examined the effects of bronchoalveolar lavage (BAL) and BAL fluid characteristics on the systemic proinflammatory cytokine expression and their relation to clinical and laboratory findings. Thirty patients suspected to have lung cancer were subjected to fiber-optic bronchoscopy (FOB) and BAL. Clinical and laboratory findings were determined at baseline, 4 h, and 24 h, including lung auscultation, temperature, chest X-ray, WBC, neutrophils, and serum IL-1beta, IL-6, and TNF-alpha. BAL fluid characteristics were determined including cytokine levels. Fifteen volunteers served as controls to determine serum variation of the same cytokines. Significant temperature elevation was defined as 1 degrees C increase compared to baseline. BAL was associated with temperature and serum TNF-alpha and IL-6 but not IL-1beta increase at 4 h. Four patients (13.3%) developed temperature over 38 degrees C. In controls there were no significant changes between baseline and 24 h measurements for the same cytokines. Eleven patients (36.6%) developed a significant temperature elevation 4 h after BAL. These patients had a statistically significant ( p < 0.05) increase in serum IL-6 at 4 h and in TNF-alpha at both 4 and 24 h after BAL compared with the nonsignificant temperature increase group. BAL characteristics were not different between the two groups. On the other hand, BAL fluid IL-6 and TNF-alpha levels were significantly higher ( p < 0.05) in the nonfever group. Significant temperature increase was observed in 36.6% of the patients undergoing BAL and associated with significant serum TNF-alpha and IL-6 increase at 4 h. Lung cytokines levels, alveolar macrophages, and BAL fluid characteristics are not related to temperature and serum proinflammatory cytokine increase. The hypothesis of alveolar macrophages derive from cytokine production and shift to the systemic circulation cannot be supported by our data.
Beiträge zur Klinik der Tuberkulose 02/2003; 181(1):35-47. DOI:10.1007/s00408-003-1001-6 · 2.27 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The Serenoa repens lipido-sterolic extract (SRLSE, Permixon, Pierre Fabre Medicament, Castres, France) is used to treat benign prostate hyperplasia. We studied the in vivo effect of SRLSE on mast cell accumulation and the histological characteristics of the rat ventral prostate. Adult Wistar rats received either tocopherol or SRLSE (50 and 100 mg/kg body weight, respectively) every second day for 90 days. Histological features were studied in hematoxylin-eosin stained tissue sections while mean mast cell numbers were determined in Giemsa-stained sections. The central region of the ventral prostate in treated animals showed significant changes with acinar epithelium becoming flat or low cuboidal. In the same region, mean mast cell number per optical field in the control, low-dose and high-dose groups were, respectively, 4.7+/-0.7, 3.4+/-1.0 and 2.4+/-0.6, showing a dose-dependent, statistically significant decrease. Administering SRLSE significantly reduces mast cell accumulation and provokes epithelium atrophy within the central area of the rat ventral prostate. These phenomena may participate in the clinical activity of the drug.
World Journal of Urology 05/2002; 19(6):457-61. DOI:10.1097/00005392-199904020-00449 · 2.67 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Congenital seminal vesicle cysts associated with renal agenesis are uncommon, but are currently detected more frequently with the use of sectional imaging procedures. Approximately 200 cases have been reported. The unique feature of our case is the combination of this disorder with an ipsilateral undescended testis. Our patient underwent partial vesiculectomy, in which the cyst was removed and the seminal vesicle remnant with its vas deferens was preserved. A review of the infertile cases and the impact of surgical treatment on fertility are discussed. Features that render partial vesiculectomy applicable and the potential effect of this procedure on fertility are highlighted.