RÉSUMÉ
Objective To observe the effect of Kadsura coccinea on the expression of Bcl-2, Bax and proliferating cell nuclear antigen (PCNA) in liver tissue of experimental hepatic fibrosis rats, to further discuss the mechanism of anti-liver fibrosis. Methods Sixty SD rats were randomly divided into normal control group, model control group, colchicine group, low-dose Kadsura coccinea group (2.5 g·kg-1) and high-dose Kadsura coccinea group (5 g·kg-1) (n = 12) . All groups except the normal control group were treated with CCl4, rich fat and poor protein to establishexperimental hepatic fibrosis animal model. The second day after modeling, drug treatmentwas started, till the end of the sixth week. Pathological section of the rat' s liver was examined in order to observe its tissue under a optical microscope. Liver tissues were taken to examine the degree of liver fibrosis by HE and Masson staining, and the expression of Bcl-2, Bax and PCNA protein were detected by immunohistochemistry. Results Kadsura coccinea relieved the degree of necrosis of liver cells, liver fat' s degeneration and collagen fiber hyperplasia significantly. Compared with the model control group, expression of Bax in low-,high-dose Kadsura coccinea group and colchicine group were significantly decreased, and the expression of PCNA in hepatic fibrosis rats were enhanced(P<0.05 or P<0.01) . Conclusion Kadsura coccinea has a certain inhibitory effects on experimental hepatic fibrosis in rats, and its mechanism may be related to inhibiting the expression of Bax protein and promoting the expression of PCNA protein in liver tissues.
RÉSUMÉ
Background: The testis is the primary reproductive organ in the male, it is an ovoid organ covered from outside inwards by, the tunica vaginalis, tunica albuginea and tunica vasculosa. Each testis is separated from its fellow by a fibrous median raphe, which is deficient superiorly. The testis consists of numerous lobules, about 250-400, each lobule contains from one to three, or more convoluted tubules. Objectives: The aim of this work was to study the prenatal and postnatal development of the albino rat testes considering its structure and maturation. Methods: 35 healthy, non-pregnant female and 18 male albino rats weighing (200-250 g) were obtained from the animalhouse, Faculty of Medicine, Zagazig University. After mating and pregnancy, the rat embryos and offsprings were divided into 3 groups and 9 subgroups; Group A (13th, 16th &18th day fetal rats), Group B (1st, 10th, 15th &21st postnatal days rats) and Group C (2 months and 6 months old rats). The fetal rats (13th and 16th) were fixed as whole, while the remaining prenatal, postnatal and adult rats were dissected to obtain testes, which were processed for light and electron microscopic examinations, morphometric and immunohistochemical studies. Results: Albino rats at prenatal day 13 (E13) showed the gonads were formed of genital ridges which were present on the posterior abdominal wall on both sides of the developing dorsal aorta. Albino rats at prenatal day 16 (E16) showed The sex cords were transformed into fetal seminiferous cords in the form of compact structures without lumen. The testes at prenatal day 18(E 18) showed the seminiferous cords form the main bulk of the testis and the interstitial tissue nearly completely differentiated with small amount of connective tissue in the spaces between seminiferous cords especially in the center. In postnatal day 1,10,15(D1,D10&D15) showed The parenchyma of testis was consisted of multiple rounded and elongated seminiferous cords. In postnatal day 21 (D21), The parenchyma of testis was consisted of multiple closely packed ovoid shaped seminiferous tubules, some of them still cords with no lumina. In adult group, The parenchyma of testis consisted of large multiple seminiferous tubules, separated by relatively narrow interstitial spaces and attained lumina containing sperms. Immunohistochemistry showed positive reaction to proliferative cell nuclear antigen (PCNA) at E13, E16 & E18. Also positive reaction to (PCNA) showed in postnatal and adult groups. Conclusion: Sexual differentiation of the gonads in albino rats starts after 13 days of gestation and the development of testes in albino rats is completed postnatally reaching full maturation at about age of two months.
RÉSUMÉ
Purpose:To study the expression of COX 2,P53 and PCNA in esophageal carcinomas and its significance. Methods:Immunohistochemical method was used to examine the sections from 82 esophageal squamous cell carcinomas, 20 esophagitis and 16 normal esophageal mucosa tissues. Results:The positive ratios of COX 2,p53 and PCNA were 87.8%(72/82),82.9%(68/82)and 95.1%(78/82) in 82 esophageal carcinomas, respectively. But there was no expression in adjacent noncancerous tissues and normal esophageal mucosa tissues. The positive ratio of COX 2 protein was significantly higher in the well differentiated and moderately differentiated esophageal carcinomas than in the poorly differentiated esophageal carcinomas( P