HSPA8(heat shock protein family A (Hsp70) member 8)またはHsc70(heat shock cognate 71 kDa protein)は、ヒトでは11番染色体(英語版)に位置するHSPA8遺伝子にコードされる熱ショックタンパク質である。Hsp70ファミリーのメンバー、そしてシャペロンタンパク質として、新たに翻訳されたタンパク質や誤ったフォールディングをしたタンパク質が正しくフォールディングするよう促進するとともに、変異タンパク質の安定化または分解も促進する。このタンパク質の機能はシグナル伝達、アポトーシス、オートファジー、タンパク質恒常性、細胞成長や分化などの生物学的過程に寄与しており、多くの種類のがん、神経変性疾患、細胞老化や加齢と関連している。
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