TY - JOUR
T1 - Type I collagen is a genetic modifier of matrix metalloproteinase 2 in murine skeletal development
AU - Egeblad, Mikala
AU - Shen, H. C.Jennifer
AU - Behonick, Danielle J.
AU - Wilmes, Lisa
AU - Eichten, Alexandra
AU - Korets, Lidiya V.
AU - Kheradmand, Farrah
AU - Werb, Zena
AU - Coussens, Lisa M.
PY - 2007/6
Y1 - 2007/6
N2 - Recessive inactivating mutations in human matrix metalloproteinase 2 (MMP2, gelatinase A) are associated with syndromes that include abnormal facial appearance, short stature, and severe bone loss. Mmp2-/- mice have only mild aspects of these abnormalities, suggesting that MMP2 function is redundant during skeletal development in the mouse. Here, we report that Mmp2-/- mice with additional mutations that render type I collagen resistant to collagenase-mediated cleavage to TCA and TCB fragments (Col1a1r/r mice) have severe developmental defects resembling those observed in MMP2-null humans. Composite Mmp2 -/-;Col1a1r/r mice were born in expected Mendelian ratios but were half the size of wild-type, Mmp2-/-, and Col1a1 r/r mice and failed to thrive. Furthermore, composite Mmp2 -/-;Col1a1r/r animals had very abnormal craniofacial features with shorter snouts, bulging skulls, incompletely developed calvarial bones and unclosed cranial sutures. In addition, trabecular bone mass was reduced concomitant with increased numbers of bone-resorbing osteoclasts and osteopenia. In vitro, MMP2 had a unique ability among the collagenolytic MMPs to degrade mutant collagen, offering a possible explanation for the genetic interaction between Mmp2 and Col1a1r. Thus, because mutations in the type I collagen gene alter the phenotype of mice with null mutations in Mmp2, we conclude that type I collagen is an important modifier gene for Mmp2.
AB - Recessive inactivating mutations in human matrix metalloproteinase 2 (MMP2, gelatinase A) are associated with syndromes that include abnormal facial appearance, short stature, and severe bone loss. Mmp2-/- mice have only mild aspects of these abnormalities, suggesting that MMP2 function is redundant during skeletal development in the mouse. Here, we report that Mmp2-/- mice with additional mutations that render type I collagen resistant to collagenase-mediated cleavage to TCA and TCB fragments (Col1a1r/r mice) have severe developmental defects resembling those observed in MMP2-null humans. Composite Mmp2 -/-;Col1a1r/r mice were born in expected Mendelian ratios but were half the size of wild-type, Mmp2-/-, and Col1a1 r/r mice and failed to thrive. Furthermore, composite Mmp2 -/-;Col1a1r/r animals had very abnormal craniofacial features with shorter snouts, bulging skulls, incompletely developed calvarial bones and unclosed cranial sutures. In addition, trabecular bone mass was reduced concomitant with increased numbers of bone-resorbing osteoclasts and osteopenia. In vitro, MMP2 had a unique ability among the collagenolytic MMPs to degrade mutant collagen, offering a possible explanation for the genetic interaction between Mmp2 and Col1a1r. Thus, because mutations in the type I collagen gene alter the phenotype of mice with null mutations in Mmp2, we conclude that type I collagen is an important modifier gene for Mmp2.
KW - Matrix metalloproteinase
KW - Osteopenia
KW - Type I collagen
UR - http://www.scopus.com/inward/record.url?scp=34250649209&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34250649209&partnerID=8YFLogxK
U2 - 10.1002/dvdy.21159
DO - 10.1002/dvdy.21159
M3 - Article
C2 - 17440987
AN - SCOPUS:34250649209
SN - 1058-8388
VL - 236
SP - 1683
EP - 1693
JO - Developmental Dynamics
JF - Developmental Dynamics
IS - 6
ER -