Yuping Chen1, Yunhao Wu2, Xiaoyang Gan3, Kai Liu4, Xing Lv5, Hongsheng Shen2, Guoying Dai6, Huiqin Xu7. 1. Key Laboratory of efficacy and safety evaluation of traditional Chinese medicine in Jiangsu Province, Nanjing 210023, China; School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China; Nursing department, Chemistry and Life Science College, Nanjing University Jinling College, Nanjing, Jiangsu 210089, China. Electronic address: 156628573@163.com. 2. Key Laboratory of efficacy and safety evaluation of traditional Chinese medicine in Jiangsu Province, Nanjing 210023, China; School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China. Electronic address: 15951933091@163.com. 3. Key Laboratory of efficacy and safety evaluation of traditional Chinese medicine in Jiangsu Province, Nanjing 210023, China; School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China. Electronic address: ganxiaowd@163.com. 4. Key Laboratory of efficacy and safety evaluation of traditional Chinese medicine in Jiangsu Province, Nanjing 210023, China; School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China. Electronic address: landarykailau@126.com. 5. Key Laboratory of efficacy and safety evaluation of traditional Chinese medicine in Jiangsu Province, Nanjing 210023, China; School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China. Electronic address: lvxinggt@163.com. 6. Key Laboratory of efficacy and safety evaluation of traditional Chinese medicine in Jiangsu Province, Nanjing 210023, China; School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China. Electronic address: 562122687@qq.com. 7. Key Laboratory of efficacy and safety evaluation of traditional Chinese medicine in Jiangsu Province, Nanjing 210023, China; School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China. Electronic address: hqxu309@yeah.net.
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE: Cornus officinalis (CO) has been widely used as a traditional Chinese medicine for treating diabetes mellitus (DM) and its complications. Iridoid glycoside from C. officinalis (IGCO) can resist apoptosis, hyperglycemia, oxidation and so on. The aim of this study was to investigate the therapeutic effects of IGCO on DM-induced testicular damage through inhibition of the AGEs/RAGE/p38 MAPK signaling pathway. MATERIALS AND METHODS: A DM model of male Wistar rats was induced with streptozotocin injection (30mg/kg, i.p.) and high-fat diet. The DM rats were administrated with IGCO at low and high doses (15 and 30mg/kg, p.o.) for 12 weeks. Testicular damage was evaluated by estimating relative testicular weights, testicular pathohistology, sperm count, live sperm rate, endogenous sex hormone level and activity of testicular marker enzymes. Besides, general diabetic symptoms, renal function, oxidative stress parameters and testicular apoptosis marker were also determined. Finally, the mechanism was explored based on the AGEs/RAGE/p38 MAPK pathway. RESULTS: IGCO effectively mitigated the general symptoms of DM rats including weight loss, polydipsia, polyphagia, polyuria, elevated blood glucose level and low serum insulin level. Nourishing the kidney evidently, IGCO reduced serum creatinine, urea nitrogen and urine protein excretion, and also markedly protected against DM-induced testicular damage by increasing testis/body weight ratio and live sperm rate, improving the histomorphology of testes, upregulating testosterone, LH, FSH and GnRH levels and preventing the decrease of testicular marker enzymes LDH, ACP and γ-GT. Moreover, IGCO showed considerable anti-oxidative and anti-apoptotic effects, which downregulated the increase of ROS and MDA levels, restored SOD and CAT activities, and decreased spermatogenic cell apoptosis and Bax/Bcl-2 ratio. In the end, the increased AGEs, RAGE and p-p38 MAPK protein levels in DM rats were also reversed by IGCO significantly. CONCLUSIONS: The kidney tonic IGCO well protected DM rats from testicular damage, which may be related to suppression of the AGEs-RAGE-p38 MAPK pathway.
ETHNOPHARMACOLOGICAL RELEVANCE: Cornus officinalis (CO) has been widely used as a traditional Chinese medicine for treating diabetes mellitus (DM) and its complications. Iridoid glycoside from C. officinalis (IGCO) can resist apoptosis, hyperglycemia, oxidation and so on. The aim of this study was to investigate the therapeutic effects of IGCO on DM-induced testicular damage through inhibition of the AGEs/RAGE/p38 MAPK signaling pathway. MATERIALS AND METHODS: A DM model of male Wistar rats was induced with streptozotocin injection (30mg/kg, i.p.) and high-fat diet. The DMrats were administrated with IGCO at low and high doses (15 and 30mg/kg, p.o.) for 12 weeks. Testicular damage was evaluated by estimating relative testicular weights, testicular pathohistology, sperm count, live sperm rate, endogenous sex hormone level and activity of testicular marker enzymes. Besides, general diabetic symptoms, renal function, oxidative stress parameters and testicular apoptosis marker were also determined. Finally, the mechanism was explored based on the AGEs/RAGE/p38 MAPK pathway. RESULTS: IGCO effectively mitigated the general symptoms of DMrats including weight loss, polydipsia, polyphagia, polyuria, elevated blood glucose level and low serum insulin level. Nourishing the kidney evidently, IGCO reduced serum creatinine, ureanitrogen and urine protein excretion, and also markedly protected against DM-induced testicular damage by increasing testis/body weight ratio and live sperm rate, improving the histomorphology of testes, upregulating testosterone, LH, FSH and GnRH levels and preventing the decrease of testicular marker enzymes LDH, ACP and γ-GT. Moreover, IGCO showed considerable anti-oxidative and anti-apoptotic effects, which downregulated the increase of ROS and MDA levels, restored SOD and CAT activities, and decreased spermatogenic cell apoptosis and Bax/Bcl-2 ratio. In the end, the increased AGEs, RAGE and p-p38 MAPK protein levels in DMrats were also reversed by IGCO significantly. CONCLUSIONS: The kidney tonic IGCO well protected DMrats from testicular damage, which may be related to suppression of the AGEs-RAGE-p38 MAPK pathway.
Authors: S Charalampidou; Μ Simitsopoulou; L Skoura; K Tziomalos; V Koulourida; D G Goulis Journal: Hippokratia Date: 2017 Jan-Mar Impact factor: 0.471
Authors: Rabi Yacoub; Melinda Nugent; Weijin Cai; Girish N Nadkarni; Lee D Chaves; Sham Abyad; Amanda M Honan; Shruthi A Thomas; Wei Zheng; Sujith A Valiyaparambil; Mark A Bryniarski; Yijun Sun; Michael Buck; Robert J Genco; Richard J Quigg; John C He; Jaime Uribarri Journal: PLoS One Date: 2017-09-20 Impact factor: 3.240