Melatonin(MT)is a low molecular weight compound with multiple biological functions in plants.It is known to delay leaf senescence in various species.However,no data are available on the MT signaling pathway in posthar...Melatonin(MT)is a low molecular weight compound with multiple biological functions in plants.It is known to delay leaf senescence in various species.However,no data are available on the MT signaling pathway in postharvest vegetables.This study demonstrates that MT increases cGMP concentration and the expression of the cGMP synthesis gene BcGC1 in pak choi.The c GMP inhibitor LY83583 destroys effect of MT delaying the leaf senescence.LY83583 also prevents MT treatment from reducing the expression of chlorophyll metabolism-related genes(BcNYC1,BcNOL,BcPPH1/2,BcSGR1/2,and BcPAO)and senescence genes(BcSAG12 and BcSAG21).It also inhibits MT from reducing the activity of the key chlorophyll catabolism enzymes Mg-dechelatase,pheophytinase,and pheide a oxygenase.Thus,the ability of MT to maintain high levels of chlorophyll metabolites is also destroyed.The Arabidopsis c GMP synthetic gene mutant atgc1 was used to confirm that delayed leaf senescence caused by MT is mediated,at least in part,by the second messenger c GMP.展开更多
The major vascular complications associated with diabetes make the management of diabetic mellitus erectile dysfunction(DMED)a challenging endeavor.Notable factors contributing to DMED include oxidative stress,nitric ...The major vascular complications associated with diabetes make the management of diabetic mellitus erectile dysfunction(DMED)a challenging endeavor.Notable factors contributing to DMED include oxidative stress,nitric oxide(NO)/cyclic guanosine monophosphate(cGMP)pathway activation,and apoptosis,while nitro-oleic acid(NO,-OA)has been shown to be beneficial in treating these aspects of this condition.We,herein,investigated the effects and possible mechanisms of NO,-OA on erectile function as assessed in a streptozotocin-induced rat model of diabetes.Our results revealed that the erectile function of DMED rats was significantly impaired compared with that of the control group.However,in response to 4 weeks of NO,-OA treatment,there was an improvement in erectile function.The expression of oxidative stress-related indicators was significantly increased and the NO/cGMP pathway was impaired in the DMED group.The expression of proapoptotic factors was increased,while that of antiapoptotic factors was decreased in the DMED group.Moreover,the cell morphology in the cavernous tissue of the DMED group also changed adversely.NO,-OA treatment significantly reversed all these changes observed in the DMED group.In conclusion,NO,-OA treatment partially improved erectile function in DMED rats through mechanisms that included inhibition of oxidative stress,activation of the NO/cGMP pathway,and a reduction in apoptosis.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.32001451)Jiangsu Agriculture Science and Technology Innovation Fund[Grant No.CX(20)1008]。
文摘Melatonin(MT)is a low molecular weight compound with multiple biological functions in plants.It is known to delay leaf senescence in various species.However,no data are available on the MT signaling pathway in postharvest vegetables.This study demonstrates that MT increases cGMP concentration and the expression of the cGMP synthesis gene BcGC1 in pak choi.The c GMP inhibitor LY83583 destroys effect of MT delaying the leaf senescence.LY83583 also prevents MT treatment from reducing the expression of chlorophyll metabolism-related genes(BcNYC1,BcNOL,BcPPH1/2,BcSGR1/2,and BcPAO)and senescence genes(BcSAG12 and BcSAG21).It also inhibits MT from reducing the activity of the key chlorophyll catabolism enzymes Mg-dechelatase,pheophytinase,and pheide a oxygenase.Thus,the ability of MT to maintain high levels of chlorophyll metabolites is also destroyed.The Arabidopsis c GMP synthetic gene mutant atgc1 was used to confirm that delayed leaf senescence caused by MT is mediated,at least in part,by the second messenger c GMP.
基金The Rongxiang Regenerative Medicine Foundation of Shandong University(No.2019SDRX-xx)supported this study.
文摘The major vascular complications associated with diabetes make the management of diabetic mellitus erectile dysfunction(DMED)a challenging endeavor.Notable factors contributing to DMED include oxidative stress,nitric oxide(NO)/cyclic guanosine monophosphate(cGMP)pathway activation,and apoptosis,while nitro-oleic acid(NO,-OA)has been shown to be beneficial in treating these aspects of this condition.We,herein,investigated the effects and possible mechanisms of NO,-OA on erectile function as assessed in a streptozotocin-induced rat model of diabetes.Our results revealed that the erectile function of DMED rats was significantly impaired compared with that of the control group.However,in response to 4 weeks of NO,-OA treatment,there was an improvement in erectile function.The expression of oxidative stress-related indicators was significantly increased and the NO/cGMP pathway was impaired in the DMED group.The expression of proapoptotic factors was increased,while that of antiapoptotic factors was decreased in the DMED group.Moreover,the cell morphology in the cavernous tissue of the DMED group also changed adversely.NO,-OA treatment significantly reversed all these changes observed in the DMED group.In conclusion,NO,-OA treatment partially improved erectile function in DMED rats through mechanisms that included inhibition of oxidative stress,activation of the NO/cGMP pathway,and a reduction in apoptosis.
