Cholecystokinin-like immunoreactivity in cat extra-adrenal paraganglia.

In the cat peripheral dopaminergic organs such as the carotid body, subclavian bodies, aortico-pulmonary glomera and small intensively fluorescent cell (SIF cell) clusters of the superior cervical ganglion and the nodose ganglion were found to contain cholecystokinin (CCK)-immunoreactive paraganglionic cells. Thus, the extra-adrenal paraganglionic system may serve as a model for studying peripheral interactions of CCKergic and dopaminergic mechanisms.