Boc and Gas1 each form distinct Shh receptor complexes with Ptch1 and are required for Shh-mediated cell proliferation.

Boc and Gas1 each form distinct Shh receptor complexes with Ptch1 and are required for Shh-mediated cell proliferation.
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DOI:
10.1016/j.devcel.2011.04.017
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发表时间:
2011-06-14
期刊:
影响因子:
11.8
通讯作者:
Charron, Frederic
Charron, Frederic
中科院分区:
生物学1区
文献类型:
--
作者:
Izzi, Luisa;Levesque, Martin;Morin, Steves;Laniel, Dominique;Wilkes, Brian C.;Mille, Frederic;Krauss, Robert S.;McMahon, Andrew P.;Allen, Benjamin L.;Charron, Frederic

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Hedgehog (Hh) 蛋白调节重要的发育过程,包括细胞增殖和分化。虽然 Patched 充当主要的 Hh 受体,但在果蝇中,Hh 信号传导绝对需要额外的 Hh 结合蛋白 Ihog 和 Boi。在这里,我们意外地发现,缺乏 Boc 和 Cdon(Ihog 和 Boi 的脊椎动物直系同源物)的小脑颗粒神经元祖细胞 (CGNP) 仍然会响应 Hh 而增殖。这是因为在它们缺失的情况下,果蝇中不存在的 Hh 结合蛋白 Gas1 会介导 Hh 信号传导。一致地,只有缺少 Boc、Cdon 和 Gas1 这三种分子的 CGNP 才会完全丧失 Hh 依赖性增殖。以互补的方式,我们发现结合 Patched1 的突变 Hh 配体,但 Boc、Cdon 和 Gas1 都不能激活 Hh 信号传导。总之,这证明了 Hh 信号转导中对 Boc、Cdon 和 Gas1 的绝对需求,并揭示了对区分脊椎动物和无脊椎动物 Hh 受体系统的配体结合成分的独特需求。
Hedgehog (Hh) proteins regulate important developmental processes including cell proliferation and differentiation. While Patched acts as the main Hh receptor, in Drosophila, Hh signaling absolutely requires the additional Hh-binding proteins Ihog and Boi. Here we show that, unexpectedly, cerebellar granule neuron progenitors (CGNPs) lacking Boc and Cdon, the vertebrate orthologs of Ihog and Boi, still proliferate in response to Hh. This is because in their absence, Gas1, a Hh-binding protein not present in Drosophila, mediates Hh signaling. Consistently, only CGNPs lacking all three molecules Boc, Cdon, and Gas1 have a complete loss of Hh-dependent proliferation. In a complementary manner, we find that a mutated Hh ligand which binds Patched1 but neither Boc, Cdon, nor Gas1 cannot activate Hh signaling. Together, this demonstrates an absolute requirement for Boc, Cdon, and Gas1 in Hh signaling and reveals a distinct requirement for ligand-binding components that distinguishes the vertebrate and invertebrate Hh receptor systems.
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