TY - JOUR
T1 - The gelatinases, matrix metalloproteinases 2 and 9, play individual roles in skeleton development
AU - Kalev-Altman, Rotem
AU - Janssen, Jerome Nicolas
AU - Ben-Haim, Nir
AU - Levy, Tamar
AU - Shitrit-Tovli, Astar
AU - Milgram, Joshua
AU - Shahar, Ron
AU - Sela-Donenfeld, Dalit
AU - Monsonego-Ornan, Efrat
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/11
Y1 - 2022/11
N2 - The gelatinases, a subgroup of the matrix metalloproteinases (MMPs) superfamily are composed of two members; MMP2 and MMP9. They are known to degrade gelatin among other components of the extracellular matrix. Recently, the two gelatinases were found to be necessary for neural crest cell migration and to compensate for each other loss in these cells. To characterize their involvement in the skeletal system, and to better reveal their individual or common roles, we have generated double knockout (dKO) mice, lacking both MMP2 and MMP9. Comprehensive analysis of the skeleton morphological and mechanical parameters at postnatal day (P) 0, P21, 3 months (M) and 8M of age, revealed an unexpected distinct role for each gelatinase; MMP2 was found to be involved merely in intramembranous ossification which led to a smaller skull and inferior cortical parameters upon its loss, while MMP9 was found to affect only the endochondral ossification process, which led to shorter long-bones in its absence. Importantly, the dKO mice demonstrated a combination of both the skull and long bone phenotypes as found in the single-KOs, and not a severer additive phenotype. Transcriptome analysis on the cortical bone, the growth plate and the skull frontal bone, found many genes that were differentially expressed as a direct or indirect result of MMP-loss, and reinforced the specific and distinct role of each gelatinase in each bone type. Altogether, these results suggest that although both gelatinases share the same substrates and are highly expressed in flat and long bones, they are indispensable and control separately the development of different bones.
AB - The gelatinases, a subgroup of the matrix metalloproteinases (MMPs) superfamily are composed of two members; MMP2 and MMP9. They are known to degrade gelatin among other components of the extracellular matrix. Recently, the two gelatinases were found to be necessary for neural crest cell migration and to compensate for each other loss in these cells. To characterize their involvement in the skeletal system, and to better reveal their individual or common roles, we have generated double knockout (dKO) mice, lacking both MMP2 and MMP9. Comprehensive analysis of the skeleton morphological and mechanical parameters at postnatal day (P) 0, P21, 3 months (M) and 8M of age, revealed an unexpected distinct role for each gelatinase; MMP2 was found to be involved merely in intramembranous ossification which led to a smaller skull and inferior cortical parameters upon its loss, while MMP9 was found to affect only the endochondral ossification process, which led to shorter long-bones in its absence. Importantly, the dKO mice demonstrated a combination of both the skull and long bone phenotypes as found in the single-KOs, and not a severer additive phenotype. Transcriptome analysis on the cortical bone, the growth plate and the skull frontal bone, found many genes that were differentially expressed as a direct or indirect result of MMP-loss, and reinforced the specific and distinct role of each gelatinase in each bone type. Altogether, these results suggest that although both gelatinases share the same substrates and are highly expressed in flat and long bones, they are indispensable and control separately the development of different bones.
KW - Double knockout
KW - Endochondral ossification
KW - Intramembranous ossification
KW - MMP2
KW - MMP9
KW - Matrix metalloproteinases
UR - http://www.scopus.com/inward/record.url?scp=85140473998&partnerID=8YFLogxK
U2 - 10.1016/j.matbio.2022.10.002
DO - 10.1016/j.matbio.2022.10.002
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C2 - 36261075
AN - SCOPUS:85140473998
SN - 0945-053X
VL - 113
SP - 100
EP - 121
JO - Matrix Biology
JF - Matrix Biology
ER -