Objective. The aim of this study was to investigate protective effects of resveratrol, a strong antioxidant, against possible negative effects of chronic immobilization stress on testes of male rats histochemically, immunohistochemically, ultrastructurally, and biochemically. Material and Methods. Male Wistar rats were divided into 4 groups (n = 7). Group I, control group (C), was not exposed to stress. Group II, stress group (S), was exposed to chronic immobilization stress. In Group III, low dose resveratrol + stress group (LRS), rats were given 10 mg/kg/day resveratrol just before the stress application. In Group IV, high dose resveratrol + stress group (HRS), rats were given 20 mg/kg/day resveratrol just before the stress application. For chronic immobilization stress application animals were put in the plastic tubes (6 cm in diameter, 15 cm in length) during 32 days for 6 hours. All animals were sacrificed 18 hours after the last stress application. Results. Histochemical and ultrastructural investigations showed that in stress group there was germ cell deprivation in seminiferous tubules and increase of connective tissue on interstitial area. No significant changes were seen in low and high dose resveratrol groups. After immunohistochemical investigations, TUNEL (+) and Active Caspase-3 (+) cells were increased in seminiferous tubules of stress group compared with those control group, but they were decreased in low and high dose resveratrol groups. According to biochemically results, MDA, GSH, and testosterone levels in stress group showed no significant difference when compared with those of the other groups. Conclusion. The chronic immobilization stress increases oxidative stress and apoptosis and causes histological tissue damages; resveratrol can minimize the histological damage in testes significantly.

Collagen zymography is an SDS-PAGE-based method for detecting both the proenzyme and active forms of collagenases. Although collagen zymography is used for assessment of the matrix metalloproteinases MMP-1 and MMP-13, it can be difficult to detect these collagenases due to technical issues. Moreover, it remains unclear whether the collagenase activity of MMP-8 can be detected by this method. Here, we present an improved collagen zymography method that allows quantification of the activities of MMP-1, MMP-8, and MMP-13. Activities of recombinant collagenases could be detected in collagen zymogram gels copolymerized with 0.3 mg/mL type I collagen extracted from rat tail tendon. This improved method is sensitive enough to detect the activity of as little as 1 ng of collagenase. We generated standard curves for the three collagenases to quantify the collagenolytic activity levels of unknown samples. To validate our improved method, we investigated MMP-1 activity levels in human thyroid cancer (8505C) and normal thyroid (Nthy-ori-3-1) cell lines, finding that the proenzyme and active MMP-1 levels were greater in 8505C cells than in Nthy-ori-3-1 cells. Taken together, our data show that collagen zymography can be used in both molecular and clinical investigations to evaluate collagenase activities in various pathological conditions.

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Lupus erythematosus is a chronic autoimmune disease characterized by remissions and exacerbations. Accumulated evidence indicated that matrix metalloproteinases (MMPs) are upregulated in inflammatory cells of cutaneous lupus erythematosus (CLE); however, the activity levels of these proteases have remained uncharacterized. To elucidate the significance of MMP-2, MMP-9, and TIMP-1 in CLE pathogenesis, gelatin zymography was used to investigate pro and active levels of MMP-2 and MMP-9 in lesional and perilesional skin biopsies obtained from twenty-two CLE patients. TIMP-1 protein levels were detected by ELISA in the biopsy specimens. The correlation between biochemical parameters and clinical characteristics of the disease was also evaluated. Significantly higher levels of active MMP-2, active MMP-9, proMMP-9, active/proMMP-2, and TIMP-1 were detected in lesional skin samples. Besides, the active/proMMP-9 was elevated in female and smoking patients. Active MMP-9 levels and active/proMMP-9 were also increased in elderly patients. Active MMP-9 levels were lower in patients who had smaller total damage score. Consistently, active/proMMP-9 and active/proMMP-2 were positively correlated with CLASI. Interestingly, in hydroxychloroquine or topical corticosteroid-treated patients, MMP-2/-9 activity levels were found to be higher compared to untreated patients. These findings suggest that increased MMP-2 and MMP-9 activities may contribute to the pathogenesis of CLE and cutaneous disease severity.

ObjectiveWe aimed to investigate the relationship of expression of matrix metalloproteinase-7 (MMP-7), tissue inhibitor of metalloproteinase-1 (TIMP-1) and cyclooxygenase-2 (COX-2) in colon cancer and its predecessor colon polyp.Materials and methodsThis study included 29 patients with colon polyp, 19 patients with colon cancer and 65 healthy control subjects. The expressions of MMP-7, TIMP-1 and COX-2 were investigated by real time-polymerase chain reaction (RT-PCR).ResultsThe expressions of TIMP-1, COX-2 and MMP-7 levels were significantly higher in polyp tissue compared to normal tissue (p = 0.024, p < 0.001, p = 0.009, respectively). Expression of TIMP-1, COX-2 and MMP-7 in cancer tissues were higher than both normal tissue and polyp tissue (p = 0.009 and p = 0.001; p < 0.001 and p < 0.001; p = 0.029 and p = 0.008, respectively). In the cancer group, no significant relationship was detected between metastasis and MMP-7, TIMP-1 and COX-2 expressions (p > 0.05). In the polyp tissues, no significant relationship was detected between the histologic type and size of polyps and MMP-7, TIMP-1 and COX-2 levels (p > 0.05). The areas under the receiver operating characteristic (ROC) curve for the cancer group were 0.821 for TIMP-1, 0.888 for COX-2, and 0.880 for MMP-7 (p = 0 < 0.001).ConclusionA role and implication of expressions of MMP-7, COX-2 and TIMP-1 in colon cancer is predicted.How to cite this articleBengi G, Keles D, Topalak Ö, Yalçin M, Kiyak R, Oktay G. Expressions of TIMP-1, COX-2 and MMP-7 in Colon Polyp and Colon Cancer. Euroasian J Hepato-Gastroenterol 2015;5(2):74-79.

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