Inflammation and apoptosis are main pathological processes that lead to the development of cardiac hypertrophy.Lupeol,a natural triterpenoid,has shown anti-inflammatory and anti-apoptotic activities as well as potential protective effects on cardiovascular diseases.In this study we investigated whether lupeol attenuated cardiac hypertrophy and fibrosis induced by pressure overload in vivo and in vitro,and explored the underlying mechanisms.Cardiac hypertrophy was induced in mice by transverse aortic constriction(TAC)surgery,and in neonatal rat cardiomyocytes(NRCMs)by stimulation with phenylephrine(PE)in vitro.We showed that administration of lupeol(50 mg kg1·d1,i.g.,for 4 weeks)prevented the morphological changes and cardiac dysfunction and remodeling in TAC mice,and treatment with lupeol(50 μg/mL)significantly attenuated the hypertrophy of PE-stimulated NRCMs,and blunted the upregulated hypertrophic markers ANP,BNP,andβ-MHC.Furthermore,lupeol treatment attenuated the apoptotic and inflammatory responses in the heart tissue.We revealed that lupeol attenuated the inflammatory responses including the reduction of inflammatory cytokines and inhibition of NF-κB p65 nuclear translocation,which was mediated by the TLR4-PI3K-Akt signaling.Administration of a PI3K/Akt agonist 740 Y-P reversed the protective effects of lupeol in TAC mice as well as in PE-stimulated NRCMs.Moreover,pre-treatment with a TLR4 agonist RS 09 abolished the protective effects of lupeol and restored the inhibition of PI3K-Akt-NF-KB signaling by lupeol in PE-stimulated NRCMs.Collectively,our results demonstrate that the lupeol protects against cardiac hypertrophy via anti-inflammatory mechanisms,which results from inhibiting the TLR4-PI3K-Akt-NF-κB signaling.

Dan Li;Ying-ying Guo;Xian-feng Cen;Hong-liang Qiu;Si Chen;Xiao-feng Zeng;Qian Zeng;Man Xu;Qi-zhu Tang

Department of Cardiology,Renmin Hospital of Wuhan University,Wuhan 430060,China; 2Cardiovascular Research Institute of Wuhan University,Wuhan 430060,China;Hubei Key Laboratory of Metabolic and Chronic Diseases,Wuhan 430060,China

中国药理学报（英文版）

[1]Dan Li;Ying-ying Guo;Xian-feng Cen;Hong-liang Qiu;Si Chen;Xiao-feng Zeng;Qian Zeng;Man Xu;Qi-zhu Tang-.Lupeol protects against cardiac hypertrophy via TLR4-PI3K-Akt-NF-κB pathways)[J].中国药理学报（英文版）,2022(08):1989-2002

Lupeol

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