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Mol Med. 1998 January; 4(1): 29–39.
PMCID: PMC2230265

Expression of amphiphysin I, an autoantigen of paraneoplastic neurological syndromes, in breast cancer.

Abstract

Amphiphysin I is a 128 kD protein highly concentrated in nerve terminals, where it has a putative role in endocytosis. It is a dominant autoantigen in patients with stiff-man syndrome associated with breast cancer, as well as in other paraneoplastic autoimmune neurological disorders. To elucidate the connection between amphiphysin I autoimmunity and cancer, we investigated its expression in breast cancer tissue. We report that amphiphysin I was expressed as two isoforms of 128 and 108 kD in the breast cancer of a patient with anti-amphiphysin I antibodies and paraneoplastic sensory neuronopathy. Amphiphysin I was also detectable at variable levels in several other human breast cancer tissues and cell lines and at low levels in normal mammary tissue and a variety of other non-neuronal tissues. The predominant amphiphysin I isoform expressed outside the brain in humans is the 108 kD isoform which represents an alternatively spliced variant of neuronal amphiphysin I missing a 42 amino acid insert. Our study suggests a link between amphiphysin I expression in cancer and amphiphysin I autoimmunity. The enhanced expression of amphiphysin I in some forms of cancer supports the hypothesis that amphiphysin family members may play a role in the biology of cancer cells.

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Selected References

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