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The BM88 antigen, a novel neuron-specific molecule, enhances the differentiation of mouse neuroblastoma cells.

J Biol Chem. 1995 Jun 09;270(23):14201-8
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摘要


The BM88 antigen is a neuron-specific molecule widely distributed in the mammalian nervous system. It is a 22-kDa, apparently not glycosylated, integral membrane protein, which appears early during brain development and remains at high levels in the mature animal. Here, we describe the cDNA cloning of the porcine BM88 antigen and present evidence that this protein is involved in neuroblastoma cell differentiation. The deduced protein is a novel molecule consisting of 140 amino acids and bears a putative transmembrane domain at the COOH-terminal region. The mRNA of this protein is expressed only in neural tissues, where it is restricted to neurons. Stably transfected Neuro-2a cells overexpressing the BM88 antigen exhibited a significant change in morphology, reflected by enhanced process outgrowth, and a slower rate of division. Moreover, in the presence of differentiation agents, such as sucrose and retinoic acid, an accelerated differentiation of the transfected Neuro-2a cells was observed. Especially in the presence of sucrose, the consequent overexpression of the BM88 antigen in the transfected cells resulted in their enhanced morphological differentiation accompanied by the induction of neurofilament protein expression. Our results suggest that the BM88 antigen plays a role in the differentiation of neuroblastoma cells.

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