Bi-Cheng Liu1, Jun Gao, Qing Li, Li-Min Xu. 1. Institute of Nephrology, Zhong Da Hospital, Southeast University, Nanjing, 210009, China. liubc64@yahoo.com.cn
Abstract
BACKGROUND: Previous studies have proposed that albuminuria is involved in the activation of intrarenal renin angiotensin system (RAS), while its potential mechanism is still unclear. We investigated the influence of albumin on the expression of ACE/ACE2 and generation of Ang II in HK2 cells. METHODS: The mRNA and protein expression of ACE and ACE2 was determined by RT-PCR and western blot respectively. Cellular localization of ACE and ACE2 was shown by laser scanning confocal microscope (LSCM). The concentration of Ang II in the supernatant was detected by radioimmunoassay (RIA). RESULTS: Treatment of HK-2 cells to BSA led to a significant increasing expression of ACE mRNA in dose and time dependent manner. The overexpression of ACE protein induced by BSA was consistent with its mRNA expression. Meanwhile, the mRNA and protein expression of ACE2 upon the stimulation of BSA was significantly downregulated in dose and time dependent manner. BSA could significantly increase the production of Ang II in the supernatant (p<0.05). Captopril, however, attenuated the expression of ACE but increased expression of ACE2 induced by BSA. CONCLUSION: These findings suggested a novel insight on the albuminuria induced activation of intrarenal RAS by upregulation of ACE and downregulation of ACE2.
BACKGROUND: Previous studies have proposed that albuminuria is involved in the activation of intrarenal renin angiotensin system (RAS), while its potential mechanism is still unclear. We investigated the influence of albumin on the expression of ACE/ACE2 and generation of Ang II in HK2 cells. METHODS: The mRNA and protein expression of ACE and ACE2 was determined by RT-PCR and western blot respectively. Cellular localization of ACE and ACE2 was shown by laser scanning confocal microscope (LSCM). The concentration of Ang II in the supernatant was detected by radioimmunoassay (RIA). RESULTS: Treatment of HK-2 cells to BSA led to a significant increasing expression of ACE mRNA in dose and time dependent manner. The overexpression of ACE protein induced by BSA was consistent with its mRNA expression. Meanwhile, the mRNA and protein expression of ACE2 upon the stimulation of BSA was significantly downregulated in dose and time dependent manner. BSA could significantly increase the production of Ang II in the supernatant (p<0.05). Captopril, however, attenuated the expression of ACE but increased expression of ACE2 induced by BSA. CONCLUSION: These findings suggested a novel insight on the albuminuria induced activation of intrarenal RAS by upregulation of ACE and downregulation of ACE2.
Authors: Li-hong Ding; Dan Liu; Min Xu; Hong Liu; Min Wu; Ri-ning Tang; Lin-li Lv; Kun-ling Ma; Bi-cheng Liu Journal: Acta Pharmacol Sin Date: 2014-08-25 Impact factor: 6.150
Authors: Dan Liu; Yi Wen; Tao-Tao Tang; Lin-Li Lv; Ri-Ning Tang; Hong Liu; Kun-Ling Ma; Steve D Crowley; Bi-Cheng Liu Journal: J Biol Chem Date: 2015-05-29 Impact factor: 5.157
Authors: Dan Liu; Min Xu; Li-Hong Ding; Lin-Li Lv; Hong Liu; Kun-Ling Ma; Ai-Hua Zhang; Steven D Crowley; Bi-Cheng Liu Journal: Int J Biochem Cell Biol Date: 2014-10-02 Impact factor: 5.085