Gαq-RGS2 loop activator modulates the activity of vario us agonists on isolated heart and aorta of normal rats

The Gαq-RGS2 loop activator, 1-(5-chloro-2-hydroxyphenyl)-3-(4-(trifluoromethyl)-phenyl)-1H-1,2,4-triazol-5(4H)-one has demonstrated Gαq signaling inhibitor activity. Therefore, we aimed to study the effect of Gαq-RGS2 loop activator on isolated heart and aorta of normal rats. Heart and aorta were isolated from the sacrificed rats (n=6) and mounted on the langendroff's and organ bath assembly, respectively. The effect of various receptor-dependent (acetylcholine, angiotensin II and adrenaline) and independent (calcium chloride and sodium nitroprusside) agonists in absence and presence of Gαq-RGS2 loop activator on left ventricular systolic pressure (LVSP) and the contractile responseswere evaluated in isolated heart and aorta, respectively. Gαq-RGS2 loop activator (100 µM) significantly attenuated the adrenaline (p<0.001,) and angiotensin II (p<0.001) induced increase in LVSP in isolated heart and contractile response of adrenaline (p<0.01) and angiotensin II (p<0.01) in the aorta. However, effect calcium chloride did not significantly alter by Gαq-RGS2 loop activator. The effect of acetylcholinewas significantly (p<0.01, p<0.05) increased by Gαq-RGS2 loop activator in isolated heart and aorta. The effect of sodium nitroprusside significantly (p<0.01) potentiated by Gαq-RGS2 loop activator (100 µM) in isolated heart while it did not significantly alters in the aorta. Ultimately, the Gαq-RGS2 loop activator modulated the action of receptor-dependent agonists in isolated heart and aorta

The Role of Serum RGS2 Protein,Ang Ⅱ and AT1R in the Pathogenesis of Pre-eclampsia / 实用妇产科杂志

Objective:To investigate the role of serum RGS2 protein,Ang Ⅱ and AT1R in the Pathogenesis of Preeclampsia and it's impact on the severity of the disease.Methods:Totally 50 patients with PE collected from Shenzhen Maternity and Child Healthcare Hospital,Southern Medical University during October 2015-September 2016 were recruited as PE group(PE with FGR group 17 cases and PE without FGR group 33 cases),40 cases of healthy pregnant women were collected as the control group.ELISA was used to detect the serum RGS2 protein,Ang Ⅱ and AT1R levels.he differences between the groups were compared.Logistic regression was used to analyze the correlation between the three indexes and the severity of PE.Results:①In PE group plasma RGS2 protein,Ang Ⅱ,AT1R levels and systolic blood pressure,diastolic blood pressure,sampling gestational age,maternal gestational age,neonatal birth weight were higher than those in control group(P ＜ 0.05);There was no significant difference on RGS2 protein level,systolic blood pressure and diastolic blood pressure between PE with FGR group and PE without FGR group(P＞0.05),There was significant difference on the Ang Ⅱ,AT1R level and newborn weight(P ＜ 0.05).②Logistic regression analysis showed that RGS2 、Ang Ⅱ and AT1R were the independent risk factors of PE.(the crude odds ratio of RGS2,Ang Ⅱ and AT1R were ＞ 1,P ＜ 0.05.After adjust the sampling of gestational age the OR values were ＞ 1,P ＜0.05.After adjust the other two indicators the OR values were ＞ 1,P ＜0.05,except for Ang Ⅱ.).③RGS2 protein,Ang Ⅱ,AT1R levels were positively correlated with PE,systolic and diastolic blood pressure(P ＜ 0.05).Ang Ⅱ,AT1R levels were negatively correlated with neonatal birth weight (P ＜ 0.05).RGS2 was not related with neonatal birth weight (P ＞ 0.05).Conclusions:Plasma RGS2 protein,Ang Ⅱ and AT1R may be associated with the pathogenesis of PE and Ang Ⅱ and AT1R may be associated with the severity of the disease.

Expression regulation and functional analysis of RGS2 and RGS4 in adipogenic and osteogenic differentiation of human mesenchymal stem cells

BACKGROUND: Understanding the molecular basis underlying the formation of bone-forming osteocytes and lipid-storing adipocytes will help provide insights into the cause of disorders originating in stem/progenitor cells and develop therapeutic treatments for bone- or adipose-related diseases. In this study, the role of RGS2 and RGS4, two members of the regulators of G protein signaling (RGS) family, was investigated during adipogenenic and osteogenenic differentiation of human mesenchymal stem cells (hMSCs). RESULTS: Expression of RGS2 and RGS4 were found to be inversely regulated during adipogenesis induced by dexamethasone (DEX) and 3-isobutyl-methylxanthine, regardless if insulin was present, with RGS2 up-regulated and RGS4 down-regulated in response to adipogenic induction. RGS2 expression was also up-regulated during osteogenesis at a level similar to that induced by treatment of DEX alone, a shared component of adipogenic and osteogenic differentiation inducing media, but significantly lower than the level induced by adipogenic inducing media. RGS4 expression was down-regulated during the first 48 h of osteogenesis but up-regulated afterwards, in both cases at levels similar to that induced by DEX alone. Expression knock-down using small interfering RNA against RGS2 resulted in decreased differentiation efficiency during both adipogenesis and osteogenesis. On the other hand, expression knock-down of RGS4 also resulted in decreased adipogenic differentiation but increased osteogenic differentiation. CONCLUSIONS: RGS2 and RGS4 are differentially regulated during adipogenic and osteogenic differentiation of hMSCs. In addition, both RGS2 and RGS4 play positive roles during adipogenesis but opposing roles during osteogenesis, with RGS2 as a positive regulator and RGS4 as a negative regulator. These results imply that members of RGS proteins may play multifaceted roles during human adipogenesis and osteogenesis to balance or counterbalance each other's function during those processes.