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Histidine decarboxylase, a pyridoxal phosphate-dependent enzyme, is an autoantigen of gastric enterochromaffin-like cells


Histidine decarboxylase, a pyridoxal phosphate-dependent enzyme, is an autoantigen of gastric enterochromaffin-like cells



Journal of Clinical Endocrinology and Metabolism 88(4): 1445-1452



ISSN/ISBN: 0021-972X

PMID: 12679420

DOI: 10.1210/jc.2002-021761

Patients with autoimmune polyendocrine syndrome type 1 often have autoantibodies against neurotransmitter synthesizing enzymes, including the pyridoxal phosphate-dependent enzymes glutamic acid decarboxylase and aromatic L-amino acid decarboxylase. Using a candidate approach, we have identified the histamine-synthesizing enzyme histidine decarboxylase, also pyridoxal phosphate dependent, as an autoantigen in this disorder. Anti-histidine decarboxylase antibodies reacting with in vitro translated antigen were found in 36/97 (37%) of autoimmune polyendocrine syndrome type 1 patients studied. The antibodies also reacted with the native enzyme in HMC-1 cell lysates and did not cross-react with the highly homologous aromatic L-amino acid decarboxylase. Anti-histidine decarboxylase antibodies were associated with a history of intestinal dysfunction (P = 0.017). Gastric and duodenal biopsies from a patient with anti-histidine decarboxylase antibodies were studied by immunohistochemistry. The oxyntic mucosa was found to lack the histamine producing enterochromaffin-like cells, suggestive of an autoimmune destruction. To our knowledge, this is the first report of autoantibodies against histidine decarboxylase and absence of gastric enterochromaffin-like cells.

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Accession: 010755649

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Related references

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