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Biomedical subjects

Sadok Korbi

Publications and source records attributed to Sadok Korbi.

9 recordsLinked to original sources
PubMed2005

Localization of tissue transglutaminase and N (epsilon)-(gamma) -glutamyl lysine in duodenal cucosa during the development of mucosal atrophy in coeliac disease.

Expression and transamidation activity of tissue transglutaminase (tTG) may be involved in the morphological modifications leading to the mucosal atrophy observed in coeliac disease (CD). We aimed to investigate the localization of tTG within the duodenal mucosa during the development of villous atrophy. The localization and level of expression of N epsilon-(gamma-glutamyl) lysine isopeptides which could reflect the transamidation activity of tTG were also analyzed. tTG and N epsilon-(gamma-glutamyl) lysine were localized using an immunohistochemical technique on duodenal biopsies obtained from 75 patients with CD and 51 subjects with normal mucosa (control group). The number of cases displaying tTG-expressing cells in the basement membrane and lamina propria was significantly higher in CD patients than in the control group. Moreover, the intensity of tTG staining in these areas was higher in CD. In contrast, the number of biopsies with tTG-expressing enterocytes was significantly lower in CD than in the control group. There was no difference in N epsilon-(gamma-glutamyl) lysine between the two populations. Tissue transglutaminase was differently expressed in the various areas of the mucosa according to the stage of atrophy, whereas the localization and the intensity of the labelling of N epsilon-(gamma-glutamyl) lysine isopeptides did not show any modification. The preferential localization in the basement membrane and lamina propria may reflect the involvement of tTG in the development of mucosal atrophy in CD.

Adolescent↗
PubMed2005

[Prevalence of Epstein-Barr virus in non-Hodgkin's lymphomas in central region of Tunisia].

The purpose of this study was to evaluate the prevalence of EBV in non-Hodgkin's lymphomas occuring in non-immunocopromised patients in Tunisia through a series of 126 cases. EBV was investigated by EBER oligonucleotide in situ hybridization (ISH) and LMP1-immunohistochemistry. Serological study of EBV has been performed before therapy in 28 patients. EBV was detected in tumor cells by ISH in 28/126 (22.2%) cases. Variable proportions of tumor cells were positive. LMP1 was identified in only 8 cases. EBV was more frequently observed in T-cell lymphomas (9/24 patients; 37.5%) than in B-cell lymphomas (19/102 patients; 18.6%) (p=0.04). There was a strong relationship between EBV and small intestine lymphomas (6/8 patients; 75%) and T/NK nasal type lymphomas (3/3 patients; 100%). EBV serological reactivation was noted in 7/13 patients in clinical stages III/IV and in only 1/10 patients in stages I/II (p=0.03). In conclusion, the prevalence of EBV in Tunisian non-Hodgkin's lymphomas is low but variable depending on the histological type and anatomical location with a predilection for small intestine and nasal lymphomas.

Epstein-Barr Virus Infections↗
PubMed2005

Primary myxoid leiomyosarcoma of the ovary. A case report with review of the literature.

A case of primary myxoid leiomyosarcoma of the ovary in a 50-year-old Tunisian woman is presented. Bilateral salpingooophorectomy and hysterectomy were carried out without any adjuvant therapy. The tumour were investigated histologically and immunohistochemically. Smooth-muscle actin and progesterone receptors was strongly demonstrated in neoplastic cells, bcl-2 was weakly and diffusely demonstrated. Relevant literature is reviewed based on the histologic and immunohistochemical features with emphasis on diagnosis and therapeutic problems and prognosis indicators.

Female↗
PubMed2004

Loss of heterozygosity at the BRCA1 locus in Tunisian women with sporadic breast cancer.

Breast cancer in Tunisia is characterized by a much higher incidence of aggressiveness compared with Western countries. The pattern of allelic loss at the BRCA1 locus in Tunisian women with breast carcinoma has not been studied. Therefore, the aim of this present preliminary study was mainly focused on loss of heterozygosity (LOH) analysis of the BRCA1 gene to determine if this tumor suppressor gene is involved in sporadic breast carcinoma among Tunisian women. We investigate allelic losses by analyzing three microsatellite markers in the BRCA1 region, in a panel of 21 human breast tumors. D17S1322 marker had the highest frequency of LOH (59%), followed by the D17S1323 (35%), and EDH-17B (20%). Collectively out of 21 informative cases 13 (62%) showed LOH at at least one BRCA1 locus. This data provides evidence that allelic loss at BRCA1 is a frequent event in sporadic breast tumorigenesis among Tunisian women, and suggests that the BRCA1 gene might play an important role as a tumor suppressor gene.

Adult↗
PubMed2004

Poly(ADP-ribose) polymerase-1, a novel partner of progesterone receptors in endometrial cancer and its precursors.

Endometrial carcinomas are the most common malignancy of the female genital tract. Although the downregulation of the progesterone receptor (PR) in the progression of endometrioid carcinomas (ECs) has been well documented, the mechanism of PR alteration in endometrioid carcinogenesis is poorly understood. Recently, biochemical studies have shown that the DNA strand break-sensing molecule poly(ADP-ribose) polymerase (PARP-1) was associated with the DNA binding domain of PR. In our present study, we show that in normal endometrial epithelium, the expression level of PARP-1 protein is high in the proliferative phase but markedly decreases during the secretory phase. Interestingly, PARP-1 expression gradually increases in nonatypical and atypical endometrial hyperplasia, reaching its highest level in grade I, and decreases significantly toward grade III ECs. Notably, PARP-1 and PR expressions, in each stage, are positively correlated (p < 0.0001), with the exception of nonendometrioid carcinomas. Thus, these data suggest that PARP-1 is substantially involved in the regulation of progesterone action in the development of ECs.

Adenocarcinoma, Clear Cell↗
PubMed2003

[Primary hepatic vipoma].

Vipoma is a rare neuroendocrine tumor most frequently localized in the pancreas. When it is extrapancreatic, it is most often neurogenic. We report a case of primary extrapancreatic vipoma that is non neurogenic localized in the right liver in a patient with severe diarrhea and hypokaliema. Computed tomography, magnetic resonance imaging, intraoperative tomography and surgical exploration did not show any other extrahepatic primary lesion. The diagnosis was performed by immunochemistry, tumorous cells were positives with anti-VIP antibody. Forty two months after right hepatectomy, the patient was asymptomatic.

Adult↗
PubMed2003

[Diagnosis and treatment of primary germ cell tumors of the mediastinum. Report of six cases].

Primary germ cell tumours of the mediastinum are rare. We report a retrospective study of six cases. Sex ratio was 2/1. The tumor site was the posterior mediastinum in two patients and anterior in the remaining cases. High level serum markers was noted in two patients. At histologic exam we found two cases of seminoma, one embryonal carcinoma, one case of yolk sac tumor and two cases of composite tumor. All patients had non metastatic but locally advanced disease at diagnosis. Three patients were treated with cisplatin based chemotherapy followed by radiotherapy or surgical resection of residual masses. Only one patient is still alive. As it is often reported in the literature, the prognosis of this disease is poor especially for non seminomatous tumours.

Adolescent↗
PubMed2002

[Epstein-Barr virus in Hodgkin's disease: the example of central Tunisia].

The purpose of this study was to evaluate the prevalence of Epstein-Barr virus in Hodgkin disease in Tunisia through a series of 77 cases. Association with Epstein-Barr virus was demonstrated by Epstein-Barr encoded early RNA transcripts (EBER) in situ hybridization in 70% of cases and by latent membrane protein 1 (LMP1) immunohistochemistry in 58.4% of cases. EBER positive cases were more frequent in extreme age classes (<15 and>54 years) there was no correlation with sex, histologic sub-type and clinical stage. Our findings show a high prevalence for EBV infection in Tunisian Hodgkin's disease particularly among extreme ages.

Adolescent↗