P63
p63,亦作TP63,全稱腫瘤蛋白p63(tumor protein p63)或惡性轉化相關蛋白63(transformation-related protein 63),在人體內由TP63基因編碼[6][7][8][9]。p63的發現是在p53基因發現後20年。p63與p53、p73同屬一個蛋白家族,三者結構與功能都較爲相似[10]。儘管p63的發現晚於p53,但進化生物學的證據表明p63是p53蛋白家族的起源,p53、p73都是由p63蛋白演化而成[11]。
功能
p63是p53蛋白家族下的一種轉錄因子。p63-/-基因型的小鼠會出現無牙、乳腺等發育依賴間充質-上皮相互作用的器官組織及無附肢等多種發育缺陷。p63蛋白的轉錄變體主要有兩種,TAp63和ΔNp63。已證明ΔNp63擁有多種功能,包括參與皮膚發育和成體幹細胞/祖細胞的功能調控[12]。相比之下,傳統的觀點認爲TAp63的功能幾乎只侷限於參與凋亡過程。不過,近期的研究還表明TAp63參與了卵母細胞完整性的維持[13]。另一些研究還表明TAp63參與了心臟發育[14]和早衰過程[15]。
臨床意義
p63蛋白的突變可能會導致兔脣、腭裂等發育畸形[16]。p63蛋白的突變可導致以等裂兔脣爲典型特徵的EEC綜合徵(ectrodactyly-ectodermal dysplasia-cleft syndrom)[16]。此外,p63蛋白的突變也可能導致3型兔脣腭裂綜合徵(EEC3)、先天性缺指(ectrodactyly,亦稱爲裂手-腳畸形4),以及以等裂兔脣爲典型特徵的AEC綜合徵[16]。此外,ADULT綜合徵(Acro–dermato–ungual–lacrimal–tooth syndrome)、附肢-乳腺綜合徵(limb-mammary syndrome)、RHS綜合徵(Rap-Hodgkin syndrome)以及也與p63蛋白功能的異常有關。目前認爲兔脣、腭裂是同時出現還是任出現一種取決於p63的不同突變[16]近期,研究人員提出使用iPS細胞分化替代缺陷型上皮細胞治療EEC綜合徵的方法[17]。
診斷
p63的免疫組化法可以用於診斷扁平細胞癌和前列腺腺癌(最常見的一種前列腺癌)[18]。正常的前列腺腺體含有基底細胞,因而組織高表達p63,免疫染色深,而惡性轉化後的腺癌組織因缺少基底細胞,p63免疫染色呈現陰性結果[19]。p63亦可用於鑑別腺癌、小細胞癌中常見的分化程度低的癌變扁平細胞[20]。
參見
- AMACR,另一種前列腺癌的腫瘤標誌物
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