title: Osteoclastogenic potential of bone marrow cells increases with age in elderly women with fracture.
abstract: The most reliable explanation for decreasing bone mass in elderly women is an imbalance of osteoclastic resorption and osteoblastic formation resulting from a relative increase in osteoclastic resorption. However, it is not clear whether an increase in osteoclastic bone resorption with age is due to increased osteoclast formation or to osteoclastic bone resorption activity. In this study, using a human bone marrow culture system, we attempt to clarify the increase in osteoclast formation with age. The mononuclear cell-rich fraction from bone marrow, obtained from the proximal region of the femur from female elderly patients with fracture, were cultured for 14 days in the presence of 1,25 dihydroxyvitamin D(3). Tartrate-resistant acid phosphatase-positive multinucleated cells were counted as osteoclasts. In our investigation, human osteoclast formation in the bone marrow culture increased with age in elderly women (age 64-96 years). The osteoclast formation was positively correlated with macrophage-colony stimulation factor and prostaglandin E(2) production in bone marrow culture. Also, osteoclast formation ex vivo was negatively correlated with bone mineral density of the lumbar spine (L2-L4). The above results indicate that the osteoclastogenic potential of bone marrow cells increases with aging in elderly women with fracture, and suggest that a decrease in bone mass of elderly women may be due to an increase in osteoclast population associated with aging.
authors.affiliation: Bone Research Group, Tokyo Metropolitan Institute of Gerontology, 35-2 Sakae-cho, Itabashi-ku, Tokyo 173, Japan. ykoshi@center.tmig.or.jp
authors.forename: Yasuko
authors.initials: Y
authors.lastname: Koshihara
authors.forename: Ayako
authors.initials: A
authors.lastname: Suematsu
authors.forename: Dongyun
authors.initials: D
authors.lastname: Feng
authors.forename: R
authors.initials: R
authors.lastname: Okawara
authors.forename: H
authors.initials: H
authors.lastname: Ishibashi
authors.forename: S
authors.initials: S
authors.lastname: Yamamoto
mesh_terms: D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D001854:Bone Marrow Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism / Q000502:physiology*; D002117:Calcitriol / Q000494:pharmacology; D002454:Cell Differentiation; D002478:Cells, Cultured; D015232:Dinoprostone / Q000096:biosynthesis / Q000494:pharmacology; D005260:Female; D005264:Femoral Fractures; D006801:Humans; D007375:Interleukin-1 / Q000494:pharmacology; D015850:Interleukin-6 / Q000096:biosynthesis / Q000494:pharmacology; D016173:Macrophage Colony-Stimulating Factor / Q000096:biosynthesis / Q000494:pharmacology; D008875:Middle Aged; D010010:Osteoclasts / Q000166:cytology / Q000187:drug effects / Q000378:metabolism / Q000502:physiology*; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology
chemical_list: D007375:Interleukin-1; D015850:Interleukin-6; D014409:Tumor Necrosis Factor-alpha; D016173:Macrophage Colony-Stimulating Factor; D002117:Calcitriol; D015232:Dinoprostone