β2-微球蛋白
β2微球蛋白(英语:β2-microglobulin,缩写B2M)是MHC1类分子分子的组成部分之一,在所有有核的细胞中(即不包括红细胞)都有表达[6][7]。在人类基因组中,β2微球蛋白[8]由B2M 基因所编码[7][9]。
结构功能
β2-微球蛋白位于细胞表面的α3链旁,但与α链不同的是,β2并没有跨膜区域,且为非共价结合。在β2的“上方”(指远离细胞膜的一端)为α链的α1区和α2区,构成了MHC的肽结合区。
β2微球蛋白不止参与形成第一类MHC分子,还能组成与之类似的表面受体,如CD1和Qa等。
β2微球蛋白还有一个功能,就是能与HFE蛋白结合,来调控铁调素在肝脏中的表达。铁调素会与肠上皮细胞和巨噬细胞膜上的膜铁转运蛋白作用。可以降低食物中和红细胞回收的铁质摄取,该功能的丧失会导致铁过量和血色沉着病。
临床意义
在长期血液透析的患者中,β2微球蛋白可以聚集成淀粉样纤维沉积在关节间隙,这种疾病被称为透析相关淀粉样变性。
缺乏β2微球蛋白基因的小鼠模型已经被改造。这些小鼠证明β2微球蛋白对于MHC Ⅰ类分子的细胞表面表达和肽结合沟的稳定性是必需的。事实上,在没有β2微球蛋白的情况下,可以在表面检测到数量非常有限的MHC I类分子。在没有MHC I类分子的情况下,CD8 T细胞不能生长(CD8 T细胞是参与获得性免疫发展的T细胞的一个子集)。低水平的β2微球蛋白可显示HIV的非进展性。
多发性骨髓瘤和淋巴瘤的β-2微球蛋白水平可能升高,但在这些情况下,原发性淀粉样变性(淀粉样轻链)和继发性淀粉样变性(淀粉样相关蛋白)更常见。β-2微球蛋白的正常值为<2 mg/L[10]。 然而,对于多发性骨髓瘤,β2微球蛋白的水平也可能处于谱的另一端。多发性骨髓瘤的诊断检测包括获取β2微球蛋白水平,因为该水平是一个重要的预后指标,水平<4 mg/L的患者的中位生存期预计为43个月,而水平>4 mg/L的患者的中位生存期仅为12个月[11]。β-2微球蛋白水平不能区分预后较好的不确定意义的单克隆免疫球蛋白血症(MGUS)和隐匿性(低度)骨髓瘤[12][13]。
参考文献
- ^ 與Β2微球蛋白相關的疾病;在維基數據上查看/編輯參考.
- ^ 2.0 2.1 2.2 GRCh38: Ensembl release 89: ENSG00000166710、ENSG00000273686 - Ensembl, May 2017
- ^ 3.0 3.1 3.2 GRCm38: Ensembl release 89: ENSMUSG00000060802 - Ensembl, May 2017
- ^ Human PubMed Reference:. National Center for Biotechnology Information, U.S. National Library of Medicine.
- ^ Mouse PubMed Reference:. National Center for Biotechnology Information, U.S. National Library of Medicine.
- ^ B2M beta-2-microglobulin [Homo sapiens (human)]. NCBI. [2022-03-16] (英语).
- ^ 7.0 7.1 Güssow, D.; Rein, R.; Ginjaar, I.; Hochstenbach, F.; Seemann, G.; Kottman, A.; Ploegh, H. L. The human beta 2-microglobulin gene. Primary structure and definition of the transcriptional unit. Journal of Immunology (Baltimore, Md.: 1950). 1987-11-01, 139 (9): 3132–3138 [2022-03-16]. ISSN 0022-1767. PMID 3312414. (原始内容存档于2022-01-05).
- ^ Cunningham, Bruce A.; Wang, John L.; Berggard, Ingemar; Peterson, Per A. Complete amino acid sequence of β 2 -microglobulin. Biochemistry. 1973-11, 12 (24): 4811–4822 [2022-03-16]. ISSN 0006-2960. PMID 4586824. doi:10.1021/bi00748a001. (原始内容存档于2022-03-16) (英语).
- ^ Suggs, S V; Wallace, R B; Hirose, T; Kawashima, E H; Itakura, K. Use of synthetic oligonucleotides as hybridization probes: isolation of cloned cDNA sequences for human beta 2-microglobulin.. Proceedings of the National Academy of Sciences. 1981-11, 78 (11): 6613–6617. ISSN 0027-8424. PMC 349099 . PMID 6171820. doi:10.1073/pnas.78.11.6613 (英语).
- ^ Pignone M, Nicoll D; McPhee SJ. Pocket guide to diagnostic tests 4th. New York: McGraw-Hill. 2004: 191. ISBN 0-07-141184-4.
- ^ Munshi NC, Longo DL, Anderson KC. Chapter 111: Plasma Cell Disorders. Loscalzo J, Longo DL, Fauci AS, Dennis LK, Hauser SL (编). Harrison's Principles of Internal Medicine 18th. McGraw-Hill Professional. 2011: 936–44. ISBN 0-07-174889-X.
- ^ Rajkumar, S. Vincent. MGUS and Smoldering Multiple Myeloma: Update on Pathogenesis, Natural History, and Management. Hematology. 2005-01-01, 2005 (1): 340–345 [2022-03-16]. ISSN 1520-4391. doi:10.1182/asheducation-2005.1.340. (原始内容存档于2022-03-16) (英语).
- ^ Bataille, R; Klein, B. Serum levels of beta 2 microglobulin and interleukin-6 to differentiate monoclonal gammopathy of undetermined significance [letter; comment]. Blood. 1992-11-01, 80 (9): 2433–2434. ISSN 0006-4971. doi:10.1182/blood.V80.9.2433.bloodjournal8092433 (英语).
延伸阅读
- Huang, Wen-Chin; Havel, Jonathan J.; Zhau, Haiyen E.; Qian, Wei Ping; Lue, Hui-Wen; Chu, Chia-Yi; Nomura, Takeo; Chung, Leland W.K. β2-Microglobulin Signaling Blockade Inhibited Androgen Receptor Axis and Caused Apoptosis in Human Prostate Cancer Cells. Clinical Cancer Research. 2008-09-01, 14 (17): 5341–5347. ISSN 1078-0432. PMC 3032570 . PMID 18765525. doi:10.1158/1078-0432.CCR-08-0793 (英语).
- Huang, Wen-Chin; Wu, Daqing; Xie, Zhihui; Zhau, Haiyen E.; Nomura, Takeo; Zayzafoon, Majd; Pohl, Jan; Hsieh, Chia-Ling; Weitzmann, M. Neale. β2-Microglobulin Is a Signaling and Growth-Promoting Factor for Human Prostate Cancer Bone Metastasis. Cancer Research. 2006-09-15, 66 (18): 9108–9116. ISSN 0008-5472. PMID 16982753. doi:10.1158/0008-5472.CAN-06-1996 (英语).
- Winchester, James F; Salsberg, Jamie A; Levin, Nathan W. Beta-2 microglobulin in ESRD: an in-depth review. Advances in Renal Replacement Therapy. 2003-10, 10 (4): 279–309 [2022-03-16]. PMID 14681859. doi:10.1053/j.arrt.2003.11.003. (原始内容存档于2022-03-03) (英语).
- Okon, Mark; Bray, Paul; Vucelic, Dusan. Proton NMR assignments and secondary structure of human .beta.2-microglobulin in solution. Biochemistry. 1992-09-22, 31 (37): 8906–8915 [2022-03-16]. ISSN 0006-2960. doi:10.1021/bi00152a030. (原始内容存档于2022-03-16) (英语).
- Guo, Hwai-Chen; Jardetzky, Theodore S.; Garrettt, Thomas P. J.; Lane, William S.; Strominger, Jack L.; Wiley, Don C. Different length peptides bind to HLA-Aw68 similarly at their ends but bulge out in the middle. Nature. 1992-11, 360 (6402): 364–366 [2022-03-16]. ISSN 0028-0836. PMID 1448153. doi:10.1038/360364a0. (原始内容存档于2022-03-14) (英语).
- Gattoni-Celli, S.; Kirsch, K.; Timpane, R.; Isselbacher, K. J. Beta 2-microglobulin gene is mutated in a human colon cancer cell line (HCT) deficient in the expression of HLA class I antigens on the cell surface. Cancer Research. 1992-03-01, 52 (5): 1201–1204 [2022-03-16]. ISSN 0008-5472. PMID 1737380. (原始内容存档于2022-03-16).
- Saper, M.A.; Bjorkman, P.J.; Wiley, D.C. Refined structure of the human histocompatibility antigen HLA-A2 at 2.6 Å resolution. Journal of Molecular Biology. 1991-05, 219 (2): 277–319 [2022-03-16]. PMID 2038058. doi:10.1016/0022-2836(91)90567-P. (原始内容存档于2022-03-03) (英语).
- Caruana, R. J.; Lobel, S. A.; Leffell, M. S.; Campbell, H.; Cheek, P. L. Tumor necrosis factor, interleukin-1 and beta 2-microglobulin levels in chronic hemodialysis patients. The International Journal of Artificial Organs. 1990-12, 13 (12): 794–798 [2022-03-16]. ISSN 0391-3988. PMID 2289831. (原始内容存档于2022-03-16).
- Connors, L.H.; Shirahama, T.; Skinner, M.; Fenves, A.; Cohen, A.S. In vitro formation of amyloid fibrils from intact β2-microglobulin. Biochemical and Biophysical Research Communications. 1985-09, 131 (3): 1063–1068 [2022-03-16]. PMID 2413854. doi:10.1016/0006-291X(85)90198-6. (原始内容存档于2019-12-05) (英语).
- Hochman, J. H.; Shimizu, Y.; DeMars, R.; Edidin, M. Specific associations of fluorescent beta-2-microglobulin with cell surfaces. The affinity of different H-2 and HLA antigens for beta-2-microglobulin. Journal of Immunology (Baltimore, Md.: 1950). 1988-04-01, 140 (7): 2322–2329 [2022-03-16]. ISSN 0022-1767. PMID 2450918. (原始内容存档于2022-03-16).
- Homma, Noriyuki; Gejyo, Fumitake; Isemura, Mamoru; Arakawa, Masaaki. Collagen-Binding Affinity of Beta-2-Microglobulin, a Preprotein of Hemodialysis-Associated Amyloidosis. Nephron. 1989, 53 (1): 37–40. ISSN 1660-8151. PMID 2674742. doi:10.1159/000185699 (英语).
- Bataille, Régis; Grenier, Jean; Commes, Thérèse. In Vitro Production of Beta 2 Microglobulin by Human Myeloma Cells. Cancer Investigation. 1988-01, 6 (3): 271–277. ISSN 0735-7907. PMID 3048575. doi:10.3109/07357908809080649 (英语).
- Hönig, R.; Marsen, T.; Schad, S.; Barth, C.; Pollok, M.; Baldamus, C. A. Correlation of beta-2-microglobulin concentration changes to changes of distribution volume. The International Journal of Artificial Organs. 1988-11, 11 (6): 459–464 [2022-03-16]. ISSN 0391-3988. PMID 3060434. (原始内容存档于2022-03-16).
- Bjorkman, P. J.; Saper, M. A.; Samraoui, B.; Bennett, W. S.; Strominger, J. L.; Wiley, D. C. Structure of the human class I histocompatibility antigen, HLA-A2. Nature. 1987-10, 329 (6139): 506–512 [2022-03-16]. ISSN 0028-0836. PMID 3309677. doi:10.1038/329506a0. (原始内容存档于2022-03-16) (英语).
- Güssow, D.; Rein, R.; Ginjaar, I.; Hochstenbach, F.; Seemann, G.; Kottman, A.; Ploegh, H. L. The human beta 2-microglobulin gene. Primary structure and definition of the transcriptional unit. Journal of Immunology (Baltimore, Md.: 1950). 1987-11-01, 139 (9): 3132–3138 [2022-03-16]. ISSN 0022-1767. PMID 3312414. (原始内容存档于2022-01-05).
- Cunningham, Bruce A.; Wang, John L.; Berggard, Ingemar; Peterson, Per A. Complete amino acid sequence of β 2 -microglobulin. Biochemistry. 1973-11, 12 (24): 4811–4822 [2022-03-16]. ISSN 0006-2960. PMID 4586824. doi:10.1021/bi00748a001. (原始内容存档于2022-03-16) (英语).
- Suggs, S V; Wallace, R B; Hirose, T; Kawashima, E H; Itakura, K. Use of synthetic oligonucleotides as hybridization probes: isolation of cloned cDNA sequences for human beta 2-microglobulin.. Proceedings of the National Academy of Sciences. 1981-11, 78 (11): 6613–6617. ISSN 0027-8424. PMC 349099 . PMID 6171820. doi:10.1073/pnas.78.11.6613 (英语).
- Momoi, Tomoko; Suzuki, Masami; Titani, Koiti; Hisanaga, Shuichi; Ogawa, Hiroshi; Saito, Akira. Amino acid sequence of a modified β2-microglobulin in renal failure patient urine and long-term dialysis patient blood. Clinica Chimica Acta. 1995-05, 236 (2): 135–144 [2022-03-16]. PMID 7554280. doi:10.1016/0009-8981(95)06039-G. (原始内容存档于2019-12-03) (英语).
- Collins, E J; Garboczi, D N; Karpusas, M N; Wiley, D C. The three-dimensional structure of a class I major histocompatibility complex molecule missing the alpha 3 domain of the heavy chain.. Proceedings of the National Academy of Sciences. 1995-02-14, 92 (4): 1218–1221. ISSN 0027-8424. PMC 42670 . PMID 7862664. doi:10.1073/pnas.92.4.1218 (英语).
- Ryo, Matoba; Kousaku, Okubo; Naohiro, Hori; Atsushi, Fukushima; Kenichi, Matsubara. The addition of 5′-coding information to a 3′-directed cDNA library improves analysis of gene expression. Gene. 1994-09, 146 (2): 199–207 [2022-03-16]. PMID 8076819. doi:10.1016/0378-1119(94)90293-3. (原始内容存档于2019-12-04) (英语).
- Wang, Z; Cao, Y; Albino, A P; Zeff, R A; Houghton, A; Ferrone, S. Lack of HLA class I antigen expression by melanoma cells SK-MEL-33 caused by a reading frameshift in beta 2-microglobulin messenger RNA.. Journal of Clinical Investigation. 1993-02-01, 91 (2): 684–692 [2022-03-16]. ISSN 0021-9738. PMC 288010 . PMID 8432869. doi:10.1172/JCI116249. (原始内容存档于2019-12-29) (英语).