Involvement of the histaminergic system in renal sympathetic and cardiovascular responses to leptin and ghrelin
- 作者：Mamoru Tanida ; Hidekazu Kaneko ; Jiao Shen ; Katsuya Nagai
- 关键词：Leptin ; Histaminergic receptors ; Kidney ; Blood pressure ; Ghrelin
- 刊名：Neuroscience Letters
- 出版年：2007
- 期刊代码：52_03043940
- 类别：neu
- 出版时间：8 February 2007
- 卷：413
- 期：1
- 页码：88-92
- 文件大小：332 K
摘要
Previous studies have demonstrated that histamine affects blood pressure (BP) in anesthetized rats. Here, we examined the effects of lateral cerebral ventricular (LCV) injection of various doses of histamine on renal sympathetic nerve activity (RSNA) and BP in anesthetized rats. LCV injection of a low dose of histamine (0.0001 nmol) suppressed RSNA and BP. Conversely, a high dose of histamine (100 nmol) elevated both RSNA and BP. Moreover, inhibiting effects of a low dose of histamine were eliminated by LCV pre-injection of thioperamide, an antagonist of histaminergic H3-receptor, and accelerating effects of a high dose of histamine were abolished by LCV pre-injection of diphenhydramine, an antagonist of histaminergic H1-receptor. Thus, these evidences suggest that central histamine affects RSNA and BP via histaminergic receptors. In addition, we examined a role for histaminergic system in cardiovascular modulators such as leptin and ghrelin. The LCV pre-injection of thioperamide clearly blocked suppressing effects of ghrelin on RSNA and BP. The LCV pre-injection of diphenhydramine also blocked elevating effects of leptin. Therefore, these results suggest that leptin and ghrelin might affect RSNA and BP by mediating central histaminegic H1- and H3-receptors, respectively.