骨鈣蛋白
骨鈣蛋白,也被稱為骨含伽馬羧酸蛋白 (BGLAP),是一種非膠原蛋白質,可見於骨或牙本質之中。因其含 伽馬羧酸基團, 所以其合成是維生素K依賴性的。在人體,骨鈣蛋白是由BGLAP 基因編碼的。[1][2] 其受體是 GPRC6A.[3]
功能
編輯骨鈣蛋白僅由成骨細胞分泌,它在人體代謝調節方面有一定作用, 並具有「促成骨」作用。[4] 它也涉及骨礦化和鈣離子動態平衡。 骨鈣蛋白在人體內也是一種荷爾蒙,它可促使胰腺的beta細胞釋放更多的胰島素, 並同時指示脂肪細胞 釋放荷爾蒙脂聯素來提高對胰島素的敏感性。[4]
當前的數據暗示骨鈣蛋白在男性生育能力方面扮演的一種可能的角色。[5] 來自哥倫比亞大學醫學中心的研究提出骨鈣蛋白可能增強睪酮的分泌。[6] 雖然這些研究只由單獨的一家實驗室進行,但至少有其它兩個團體曾獨立確認了骨鈣蛋白在胰島素分泌方面的作用。[7][8]
用做成骨過程的生化標記
編輯由於骨鈣蛋白是由成骨細胞產生,所以它常常被用作成骨過程標記。在使用針對成骨細胞的成骨促進藥物,如 特立帕肽(Teriparatide)的治療過程當中,曾觀察到較高的血漿骨鈣蛋白水平與骨礦物質密度(BMD)之間有較高的相關性。在許多研究當中,骨鈣蛋白被用作一種指示某種藥物骨形成效應的基本的生化標記。例如,一項針對一種叫做乳鐵蛋白(lactoferrin)的糖蛋白對成骨過程效用的研究就使用了骨鈣蛋白作為成骨細胞活躍度的度量指標。[9]
引用
編輯- ^ Puchacz E, Lian JB, Stein GS, Wozney J, Huebner K, Croce C. 人类骨钙蛋白基因染色体定位. Endocrinology. May 1989, 124 (5): 2648–50. PMID 2785029. doi:10.1210/endo-124-5-2648.
- ^ Cancela L, Hsieh CL, Francke U, Price PA. 分子结构,染色体分配,以及人类基质Gla的蛋白质基因的启动子的组织. J. Biol. Chem. 1990,九月, 265 (25): 15040–8. PMID 2394711.
- ^ 存档副本. [2014-10-18]. (原始內容存檔於2014-10-18).
- ^ 4.0 4.1 Lee NK, Sowa H, Hinoi E, Ferron M, Ahn JD, Confavreux C, Dacquin R, Mee PJ, McKee MD, Jung DY, Zhang Z, Kim JK, Mauvais-Jarvis F, Ducy P, Karsenty G. 骨骼对能量代谢的内分泌调节(Endocrine regulation of energy metabolism by the skeleton). Cell. August 2007, 130 (3): 456–69. PMC 2013746 . PMID 17693256. doi:10.1016/j.cell.2007.05.047.
- ^ Franck Oury, Grzegorz Sumara, Olga Sumara, Mathieu Ferron, Haixin Chang, Charles E. Smith, Louis Hermo, Susan Suarez, Bryan L. Roth, Patricia Ducy et al.骨骼對男性生育力的內分泌調節 (Endocrine Regulation of Male Fertility by the Skeleton). Cell, 17 February 2011 doi:10.1016/j.cell.2011.02.004
- ^ 睪酮
- ^ Pi M, Wu Y, Quarles DL. GPRC6A介导体外beta细胞和体内胰腺对骨钙蛋白的反应(GPRC6A mediates responses to osteocalcin in beta-cells in vitro and pancreas in vivo). JBMR. July 2011, 26 (7): 1680–1683. PMID 21425331. doi:10.1002/jbmr.390.
- ^ Fulzele K, Riddle RC, DiGirolamo DJ, Cao X, Wan C, Chen D, Faugere MC, Aja S, Hussain MA, Brüning JC, Clemens TL. Insulin receptor signaling in osteoblasts regulates postnatal bone acquisition and body composition. Cell. July 2010, 142 (2): 309–19. PMC 2925155 . PMID 20655471. doi:10.1016/j.cell.2010.06.002.
- ^ Bharadwaj S, Naidu AG, Betageri GV, Prasadarao NV, Naidu AS. Milk ribonuclease-enriched lactoferrin induces positive effects on bone turnover markers in postmenopausal women. Osteoporos Int. September 2009, 20 (9): 1603–11. PMID 19172341. doi:10.1007/s00198-009-0839-8.
延伸閱讀
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