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en Effects of Oral Dosage of Lead Acetate II on Osteocalcin Gene Expression in Rat Mesenchymal Stem Cells بیوشیمی Biochemistry مقالات اصلی Original Article <div style="text-align: justify;">Background: Lead (Pb) is a heavy metal that has devastating effects on many animal tissues. In this study we investigated the effects of orally-dosed lead acetate II on osteocalcin gene (osteocalcin) expression in mesenchymal stem cells grown in an osteogenic medium. Osteocalcin is an abundant bone matrix differentiation protein. Methods: Twelve male Wistar rats were divided into three groups of four rats each. Two groups were fed orally with 50 or 100 ppm of lead acetate II with libitum feed and water for two months. The control group was fed with libitum feed and water only. Rats were euthanized and femoral bone marrow mesenchymal stem cells (BM-MSCs) were extracted. The cells were cultured in osteogenic medium and osteocalcin expression was determined by real-time PCR. Results: Real-time PCR showed that osteocalcin expression was significantly less in the BM-MSCs of rats that received 100 ppm of lead acetate II than in the BM-MSCs of the other groups (P<0.05), and that osteocalcin expression was less in the BM-MSCs of the group that received 50 ppm of lead acetate II than in the control group. Conclusions: Doses of 50 and 100 ppm of lead acetate II in rats caused a significant decrease in osteocalcin expression in BM-MSCs grown in osteogenic medium.</div> Bone Marrow, Lead acetate, Osteocalcin, Real-Time Polymerase Chain Reaction, Stem Cells 131 136 http://rbmb.net/browse.php?a_code=A-10-38-1&slc_lang=en&sid=1 Hossein Rafiei hosraf1@gmail.com 10031947532846002876 10031947532846002876 No Department of Biology, Faculty of Sciences, Shiraz Branch, Islamic Azad University, Shiraz, Iran Mehrdad Shariati mehrdadshariati@hotmail.com 10031947532846002877 10031947532846002877 Yes Department of Biology, Kazerun Branch, Islamic Azad University, Kazerun, Iran. Jina Khayatzadeh J.khayatzadeh@mshdiau.ac.ir 10031947532846002878 10031947532846002878 No Department of Biology, Mashhad Branch, Islamic Azad University, Mashhad, Iran. Sima Afsharnezhad sanegad@yahoo.com 10031947532846002879 10031947532846002879 No Department of Biochemistry, Mashhad Branch, Medical Innovation Research Center of Azad University, Mashhad, Iran Majid Farhoodi m.farhoodi@yahoo.com 10031947532846002880 10031947532846002880 No Razi Vaccine & Serum Research Institute, Mashhad, Iran.