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Endocrine Research Unit, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55905
Address all correspondence and requests for reprints to: Dr. B. Lawrence Riggs, Mayo Clinic, 200 First Street SW, North 6 Plummer, Rochester, Minnesota 55905. E-mail address: riggs.lawrence{at}mayo.edu
Both bone mass and serum leptin levels are increased in obesity.
Because osteoblasts and adipocytes arise from a common precursor in
bone marrow, we assessed the effects of human recombinant leptin on a
conditionally immortalized human marrow stromal cell line, hMS212,
with the potential to differentiate to either the osteoblast or
adipocyte phenotypes. By RT-PCR and Western immunoblot analysis, the
hMS212 cells expressed messenger RNA (mRNA) and protein for the
leptin receptor. Leptin did not affect hMS212 cell proliferation, but
resulted in dose- and time-dependent increases in mRNA and protein
levels of alkaline phosphatase, type I collagen, and osteocalcin, and
in a 59% increase in mineralized matrix. Leptin increased mRNA levels
of lipoprotein lipase at 3 days, but decreased mRNA levels of adipsin
and leptin at 9 days and decreased lipid droplet formation by 50%.
Leptin did not affect the expression of Cbfa1 or
peroxisome proliferator-activated receptor-
2,
transcription factors involved in commitment to the osteoblast and
adipocyte pathways, respectively. Thus, leptin acts on human marrow
stromal cells to enhance osteoblast differentiation and to inhibit
adipocyte differentiation. Our data support the hypothesis that leptin
is a previously unrecognized, physiological regulator of these two
differentiation pathways, acting primarily on maturation of stromal
cells into both lineages.
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