期刊
BRAIN RESEARCH
卷 898, 期 1, 页码 171-177出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0006-8993(01)02156-4
关键词
spectrin; Src homology 3 domain; endocytosis; macropinosome
资金
- NINDS NIH HHS [R29 NS32874, R29 NS032874-05S1, R29 NS032874-05] Funding Source: Medline
Spectrins represent a family of membrane-associated proteins responsible for membrane flexibility and cell shape in erythrocytes, and probably in most nonerythroid cells. Spectrin functions as a tetramer consisting of two heterodimers each containing two subunits termed alpha and beta. In humans, alphaI and alpha II spectrins but not beta spectrins are characterized by the presence of an Src homology 3 (SH3) domain. As a tool to investigate the function of spectrin SH3 domains we derived several monoclonal antibodies (mAb) to the recombinant human alphaI or alpha II spectrin SH3 domain. Immunostaining using these monoclonal antibodies indicated expression of alphaI spectrin in cell bodies and alpha II spectrin in neurites of granule neurons in mouse primary cerebellar cultures. Monoclonal antibodies reactive to aI spectrin SH3 domain indicated expression of a protein(s) containing an alphaI-like SH3 domain in cytoplasmic vesicular-like structures in GFAP-positive cells in these cultures. In NIH 3T3 fibroblasts, these antibodies label macropinocytic vesicles. Together, these data and Western blotting results suggest expression of at least three spectrin-SH3 domain antibody-reactive proteins. (C) 2001 Elsevier Science B.V. All rights reserved.
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