Calretinin and calbindin-D28k immunoreactivity in the human gastrointestinal tract.

Abstract:

BACKGROUND:Calretinin and calbindin-D28k are similar Ca(2+)-binding proteins previously described in specific central neurons and other cells. METHODS:The immunocytochemical distribution of these two proteins was studied in the human gastrointestinal tract. RESULTS:In gastric and small intestinal endocrine cells, calbindin-D28k immunoreactivity was confirmed, but calretinin immunoreactivity was not found. Nerve cell bodies in both submucous and myenteric ganglia were immunoreactive for calbindin (13% and 38% of total cells, respectively) or calretinin (23% and 21%), some containing both proteins. In nerve processes, calretinin was generally more abundant than calbindin and was found particularly around blood vessels. Calretinin co-localized with immunoreactive vasoactive intestinal peptide, neuropeptide Y, galanin, or substance P in submucous ganglion cells and with substance P in myenteric cells. Calbindin-D28k colocalized with fewer peptides, specifically vasoactive intestinal peptide or galanin in submucous cells. By 8 weeks of fetal development, discrete neuronal localizations for both proteins and for calbindin-D28k in endocrine cells were apparent. CONCLUSIONS:In the enteric neuroendocrine system, calretinin and calbindin-D28k are useful markers that may help elucidate Ca(2+)-mediated functions in health and disease.

journal_name

Gastroenterology

journal_title

Gastroenterology

authors

Walters JR,Bishop AE,Facer P,Lawson EM,Rogers JH,Polak JM

doi

10.1016/0016-5085(93)90346-e

subject

Has Abstract

pub_date

1993-05-01 00:00:00

pages

1381-9

issue

5

eissn

0016-5085

issn

1528-0012

pii

0016-5085(93)90346-E

journal_volume

104

pub_type

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