Effect of risperidone on proliferation and apoptosis of MC3T3-E1 cells

This aim of this study was to assess the molecular mechanism of osteoporosis in schizophrenia patients with risperidone use. Here, we investigated the effects of risperidone on cellular proliferation and apoptosis of a preosteoblast cell line, MC3T3-E1. Cell viability and apoptotic rate of MC3T3-E1 were detected by cell counting kit-8 and flow cytometry at a serial dose of risperidone and at different time points, respectively. Bone transformation relevant gene serum osteocalcin (BGP), collagen 1, tumor necrosis factor-α (TNF-α), osteoprotegerin (OPG), and receptor activator of nuclear factor-κB ligand (RANKL) mRNA levels were determined by real-time PCR (qPCR). Their protein expression patterns were evaluated using western blot. The results revealed that risperidone dramatically inhibited MC3T3-E1 cell proliferation in a dose-dependent manner. It also significantly induced MC3T3-E1 cell apoptosis. TNF-α gene and protein levels were greatly enhanced after risperidone treatment. In contrast, BGP, collagen 1, OPG, and RANKL gene and protein levels were markedly downregulated. Our study indicated that risperidone suppressed MC3T3-E1 cell proliferation and induced apoptosis. It also regulated BGP gene and protein expression.

Cloning and expression analysis of an aldehyde oxidase gene in Arachis hygogaea L.

Aldehyde oxidase (AO) plays important role in plant hormone biosynthetic pathways, such as abscisic acid (ABA) and indole- 3-acetic acid (IAA). The enzyme catalyzes the last step of the pathways. In this study, a full-length cDNA encoding an aldyhyde oxidase was cloned and sequenced from leaves of peanut by RT-PCR, RACE-PCR and genomic DNA walking methods. The full-length cDNA, designated as Arachis hygogaea L. aldehyde oxidase1 (AhAO1), consists of an open reading frame of 4131bp, a 326 bp 5¢ untranslated region and a 128 bp 3¢ untranslated region including a poly (A) tail of 21 nucleotides. The gene encodes a polypeptide of 1377 amino acids with a calculated molecular weight of 150 kDa and an isoelectric point (pI) of 6.99. Analysis of amino acid sequence of AhAO1 shows that it had 61%, 59% and 55% identity with the AOs from tomato, Arabidopsis and maize, respectively. The peanut AO polypeptide contains consensus sequences for iron-sulfur centers and a molybdenum cofactor (MoCo)-binding domain. Semi-quantitative RT-PCR analysis showed that AhAO1 expression was higher in leaves than in roots of peanut.