Melanocytes derived from patients with Hermansky-Pudlak Syndrome types 1, 2, and 3 have distinct defects in cargo trafficking

被引:43
作者
Richmond, B
Huizing, M
Knapp, J
Koshoffer, A
Zhao, Y
Gahl, WA
Boissy, RE
机构
[1] Univ Cincinnati, Dept Dermatol, Coll Med, Cincinnati, OH 45267 USA
[2] NHGRI, Sect Human Biochem Genet, Med Genet Branch, NIH, Bethesda, MD 20892 USA
关键词
pigmentation; albinism; tyrosinase; lysosomes; translocation;
D O I
10.1111/j.0022-202X.2004.23585.x
中图分类号
R75 [皮肤病学与性病学];
学科分类号
100206 ;
摘要
Hermansky-Pudlak Syndrome (HIPS) is a genetically heterogeneous disorder in which mutations in one of several genes interrupts biogenesis of melanosomes, platelet dense bodies, and lysosomes. Affected patients have oculocutaneous albinism, a bleeding diathesis, and sometimes develop granulomatous colitis or pulmonary fibrosis. In order to assess the role of HPS genes in melanosome biogenesis, melanocytes cultured from patients with HPS subtypes 1, 2, or 3 were assessed for the localization of various melanocyte proteins. Tyrosinase, Tyrp1, and Dct/Tyrp2 were atypically and distinctly expressed in HPS-1 and HPS-3 melanocytes, whereas only tyrosinase showed an atypical distribution in HPS-2 melanocytes. The HPS1 and AP3B1 (i.e., HPS-2) gene products showed no expression in HPS-1 and HPS-2 melanocytes, respectively, whereas HPS-3 melanocytes exhibited normal expression for both proteins. In normal human melanocytes, the HPS1 protein was expressed as an approximately 80 kDa molecule with both granular and reticular intracellular profiles. In HPS-1, lysosome associated membrane protein 1 (LAMP1), and LAMP3 were localized to abnormal large granules; in HPS-2, all LAMPs exhibited a normal granular expression; and in HPS-3, LAMP1, and LAMP3 exhibited a distinct less granular and more floccular pattern. In contrast, the expressions of Rab 27, transferrin, and cKit were unaffected in all three HPS genotypes. These data demonstrate that the three initially identified subtypes of human HPS exhibit distinct defects in the trafficking of various melanocyte-specific proteins.
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页码:420 / 427
页数:8
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