title: Chronic ethanol intake inhibits in vitro osteogenesis induced by osteoblasts differentiated from stem cells.
abstract: The study investigated whether chronic ethanol (ETH) intake and subsequent ETH exposure of cell cultures affects osteoblast differentiation by evaluating key parameters of in vitro osteogenesis. Rats were treated with 5-20% (0.85-3.43 mm) ETH, increasing by 5% per week for a period of 4 weeks (habituation), after which the 20% level was maintained for 15 days (chronic intake). Bone-marrow stem cells from control (CONT) or ETH-treated rats were cultured in osteogenic medium which was either supplemented (ETH) or not supplemented (CONT) with 1.3 mm ethanol. Thus, four groups relating to rat treatment/culture supplementation were evaluated: (1) CONT/CONT, (2) ETH/CONT, (3) CONT/ETH and (4) ETH/ETH. Cell morphology, proliferation and viability, total protein content, alkaline phosphatase (ALP) activity and bone-like nodule formation were evaluated. Chronic ethanol intake significantly reduced both food and liquid consumption and body weight gain. No difference was seen in cell morphology among treatments. Cell number was affected at 7 and 10 days as follows: CONT/CONT = CONT/ETH < ETH/CONT = ETH/ETH. Doubling time between 3 and 10 days was greater in groups of CONT animals: ETH/ETH = ETH/CONT < CONT/ETH = CONT/CONT. Cell viability and ALP activity were not affected by either animal treatment or culture exposure to ethanol. At day 21, the total protein content was affected as follows: ETH/ETH = CONT/ETH < ETH/CONT = CONT/CONT. Bone-like nodule formation was affected as follows: ETH/ETH < CONT/ETH < ETH/CONT < CONT/CONT. These results show that chronic ethanol intake, followed by the exposure of osteoblasts to ethanol, inhibited the differentiation of osteoblasts, as indicated by an increased proliferation rate and reduced bone-like nodule formation.
authors.affiliation: Department of Biophysiologic Sciences, Faculty of Medicine of Catanduva, Padre Albino Foundation, Av. Sao Vicente de Paulo 1455, 15809-145, Catanduva, SP, Brazil.
authors.forename: Maria L
authors.initials: ML
authors.lastname: Rosa
authors.forename: Marcio M
authors.initials: MM
authors.lastname: Beloti
authors.forename: Natalia
authors.initials: N
authors.lastname: Prando
authors.forename: Regina H C
authors.initials: RH
authors.lastname: Queiroz
authors.forename: Paulo T
authors.initials: PT
authors.lastname: de Oliveira
authors.forename: Adalberto L
authors.initials: AL
authors.lastname: Rosa
mesh_terms: D000437:Alcoholism / Q000150:complications / Q000378:metabolism / Q000473:pathology* / Q000503:physiopathology; D000469:Alkaline Phosphatase / Q000378:metabolism; D000818:Animals; D001854:Bone Marrow Cells / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D002454:Cell Differentiation / Q000187:drug effects*; D049109:Cell Proliferation / Q000187:drug effects; D048430:Cell Shape / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D000431:Ethanol / Q000633:toxicity*; D008297:Male; D010006:Osteoblasts / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D010012:Osteogenesis / Q000187:drug effects*; D010024:Osteoporosis / Q000209:etiology / Q000473:pathology / Q000503:physiopathology; D014176:Protein Biosynthesis / Q000187:drug effects; D051381:Rats; D017208:Rats, Wistar; D013234:Stem Cells / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D013997:Time Factors
chemical_list: D000431:Ethanol; D000469:Alkaline Phosphatase