Synthesis and secretion of transcobalamin II by cultured astrocytes derived from human brain tissue.


Astrocytes derived from human brain tissue secreted a single cobalamin (vitamin B12, Cbl) binding protein over a 4 day period in culture. Cycloheximide reversibly inhibited the release, and the binding protein was identified as transcobalamin II (TCII) based on molecular size, reaction with anti-human TCII antiserum, precipitation with 2.0 M ammonium… (More)


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