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Perturbations in blood Ca(2)+ do not affect the activity of rat stomach enterochromaffin-like cells.

BACKGROUND
Gastrin stimulates uptake of Ca(2)+ into bone and causes transient hypocalcemia, possibly by releasing a peptide hormone from enterochromaffin-like (ECL) cells, which are histamine- and peptidehormone-producing cells in the acid-producing part of the stomach. However, if ECL cells secrete a calciotropic hormone, it is to be expected that their activity is affected by the serum Ca(2)+ concentration.


METHODS
Food-deprived male rats were infused with human (Leu)15-gastrin-17 and/or ethylenediamine-tetraacetic acid and CaCl(2). The blood Ca(2)+ level was monitored throughout the experiments (3 h), and the serum concentrations of gastrin, parathyroid hormone, and calcitonin were measured at death. The activity of the ECL cells was assessed by measuring the histidine decarboxylase (HDC) activity.


RESULTS
Gastrin produced the expected increase in HDC activity, but neither hyper- nor hypo-calcemia affected the RDC activity of either hypo- or hyper-gastrinemic rats.


CONCLUSION
Perturbations in blood Ca(2)+ do not seem to affect ECL cells, which is at odds with the view that ECL cells harbor a calciotropic hormone.