G-protein stimulatory subunit alpha and Gq/11α G-proteins are both required to maintain quiescent stem-like chondrocytes.
G-protein stimulatory subunit alpha and Gq/11α G-proteins are both required to maintain quiescent stem-like chondrocytes.
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DOI:
10.1038/ncomms4673
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发表时间:
2014-04-30
影响因子:
16.6
通讯作者:
Kronenberg, Henry M.
中科院分区:
文献类型:
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作者:
Chagin, Andrei S.;Vuppalapati, Karuna K.;Kobayashi, Tatsuya;Guo, Jun;Hirai, Takao;Chen, Min;Offermanns, Stefan;Weinstein, Lee S.;Kronenberg, Henry M.
Round chondrocytes in the resting zone of the growth plate provide precursors for columnar chondrocytes and have stem-like properties. Here we demonstrate that these stem-like chondrocytes undergo apoptosis in the absence of the receptor (PPR) for parathyroid hormone-related protein. We examine the possible roles of heterotrimeric G-proteins activated by the PPR. Inactivation of the G-protein stimulatory α-subunit (Gsα) leads to accelerated differentiation of columnar chondrocytes, as seen in the PPR knockout, but a remnant of growth cartilage remains, in contrast to disappearance of the growth cartilage in the PPR knockout. Stem-like chondrocytes lose their quiescence and proliferate upon Gsα ablation. Inactivation of Gsα in mice with a mutant PPR that cannot activate G proteins, Gq and G11, leads to a PPR knockout-like phenotype. Thus, Gsα is the major mediator of the anti-differentiation action of the PPR, while activation of both Gsα and Gq/11α is required for quiescence of stem-like chondrocytes.
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