title: Geniposide, the component of the Chinese herbal formula Tongluojiunao, protects amyloid-β peptide (1-42-mediated death of hippocampal neurons via the non-classical estrogen signaling pathway.
abstract: Tongluojiunao (TLJN) is an herbal medicine consisting of two main components, geniposide and ginsenoside Rg1. TLJN has been shown to protect primary cultured hippocampal neurons. However, its mechanism of action remains unclear. In the present study, primary cultured hippocampal neurons treated with Aβ1-42 (10 µmol/L) significantly increased the release of lactate dehydrogenase, which was markedly reduced by TLJN (2 µL/mL), specifically by the component geniposide (26 µmol/L), but not ginsenoside Rg1 (2.5 µmol/L). The estrogen receptor inhibitor, ICI182780 (1 µmol/L), did not block TLJN- or geniposide-mediated decrease of lactate dehydrogenase under Aβ1-42-exposed conditions. However, the phosphatidyl inositol 3-kinase or mitogen-activated protein kinase pathway inhibitor, LY294002 (50 µmol/L) or U0126 (10 µmol/L), respectively blocked the decrease of lactate dehydrogenase mediated by TLJN or geniposide. Therefore, these results suggest that the non-classical estrogen pathway (i.e., phosphatidyl inositol 3-kinase or mitogen-activated protein kinase) is involved in the neuroprotective effect of TLJN, specifically its component, geniposide, against Aβ1-42-mediated cell death in primary cultured hippocampal neurons.
authors.affiliation: School of Preclinical Medicine, Beijing University of Chinese Medicine, Beijing, China.
authors.forename: Jiao
authors.initials: J
authors.lastname: Li
authors.affiliation: School of Preclinical Medicine, Beijing University of Chinese Medicine, Beijing, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.affiliation: School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China.
authors.forename: Haimin
authors.initials: H
authors.lastname: Ding
authors.affiliation: School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China.
authors.forename: Chunyan
authors.initials: C
authors.lastname: Jin
authors.affiliation: School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China.
authors.forename: Jinyan
authors.initials: J
authors.lastname: Chen
authors.affiliation: School of Preclinical Medicine, Beijing University of Chinese Medicine, Beijing, China.
authors.forename: Yanan
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China.
authors.forename: Xiaojing
authors.initials: X
authors.lastname: Li
authors.affiliation: School of Preclinical Medicine, Beijing University of Chinese Medicine, Beijing, China.
authors.forename: Wenju
authors.initials: W
authors.lastname: Chen
authors.affiliation: School of Preclinical Medicine, Beijing University of Chinese Medicine, Beijing, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Sun
authors.affiliation: School of Preclinical Medicine, Beijing University of Chinese Medicine, Beijing, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Tan
authors.affiliation: School of Preclinical Medicine, Beijing University of Chinese Medicine, Beijing, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: School of Preclinical Medicine, Beijing University of Chinese Medicine, Beijing, China.
authors.forename: Xu
authors.initials: X
authors.lastname: Wang
authors.affiliation: School of Preclinical Medicine, Beijing University of Chinese Medicine, Beijing, China.
authors.forename: Angran
authors.initials: A
authors.lastname: Fan
authors.affiliation: School of Preclinical Medicine, Beijing University of Chinese Medicine, Beijing, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Hua
keywords: Alzheimer's disease; Aβ1–42; NSFC grant; Tongluojiunao injection; cell culture; estrogen signaling pathway; geniposide; ginsenoside Rg1; hippocampus; mitogen-activated protein kinase pathway; nerve regeneration; neural regeneration; neurodegeneration; neurons; phosphatidyl inositol 3-kinase pathway