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2014 ; 28
(4
): 546-53
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Runx1-mediated regulation of osteoclast differentiation and function
#MMPMID24606124
Soung do Y
; Kalinowski J
; Baniwal SK
; Jacome-Galarza CE
; Frenkel B
; Lorenzo J
; Drissi H
Mol Endocrinol
2014[Apr]; 28
(4
): 546-53
PMID24606124
show ga
Excessive bone resorption is the cause of several metabolic bone diseases
including osteoporosis. Thus, identifying factors that can inhibit osteoclast
formation and/or activity may define new drug targets that can be used to develop
novel therapies for these conditions. Emerging evidence demonstrates that the
master regulator of hematopoiesis, Runx1, is expressed in preosteoclasts and may
influence skeletal health. To examine the potential role of Runx1 in osteoclast
formation and function, we deleted its expression in myeloid osteoclast
precursors by crossing Runx1 floxed mice (Runx1(F/F)) with CD11b-Cre transgenic
mice. Mice lacking Runx1 in preosteoclasts (CD11b-Cre;Runx1(F/F)) exhibited
significant loss of femoral trabecular and cortical bone mass compared with that
in Cre-negative mice. In addition, serum levels of collagen type 1 cross-linked
C-telopeptide, a biomarker of osteoclast-mediated bone resorption, were
significantly elevated in CD11b-Cre;Runx1(F/F) mice compared with those in
Runx1(F/F) mice. Tartrate-resistant acid phosphatase-positive osteoclasts that
differentiated from bone marrow cells of CD11b-Cre;Runx1(F/F) mice in vitro were
larger, were found in greater numbers, and had increased bone resorbing activity
than similarly cultured cells from Runx1(F/F) mice. CD11b-Cre;Runx1(F/F) bone
marrow cells that were differentiated into osteoclasts in vitro also had elevated
mRNA levels of osteoclast-related genes including vacuolar ATPase D2, cathepsin
K, matrix metalloproteinase 9, calcitonin receptor, osteoclast-associated
receptor, nuclear factor of activated T cells cytoplasmic 1, and cFos. These data
indicate that Runx1 expression in preosteoclasts negatively regulates osteoclast
formation and activity and contributes to overall bone mass.