Muscarinic cholinergic receptor subtypes in the pigeon bursa of Fabricius: a radioligand binding and autoradiographic study.

Abstract:

:The pharmacological profile and the anatomical localisation of muscarinic cholinergic receptor subtypes were studied in the pigeon bursa of Fabricius, using radioligand binding and autoradiographic techniques with [3H]quinuclidinyl benzilate (QNB) as a ligand. [3H]QNB was specifically bound to sections of bursa of Fabricius. The binding was time-, temperature- and concentration-dependent. The dissociation constant was 0.31 +/- 0.02 nM, and the maximum density of binding sites averaged 38 +/- 2.5 fmol/mg protein. The pharmacological profile of [3H]QNB binding to sections of pigeon bursa of Fabricius was consistent with the labelling of M2, M3 and M4 muscarinic receptor subtypes. Light microscope autoradiography showed the localisation of [3H]QNB binding sites in the medulla, in follicular septa, in the cortico-medullary border and in lesser amounts in the cortical layer. The functional significance of these receptors should be clarified in future studies.

journal_name

J Neuroimmunol

authors

Ricci A,Bronzetti E,Felici L,Ciriaco E,Vega JA,Germanà G

doi

10.1016/0165-5728(96)00012-4

subject

Has Abstract

pub_date

1996-05-01 00:00:00

pages

23-8

issue

1-2

eissn

0165-5728

issn

1872-8421

pii

0165-5728(96)00012-4

journal_volume

66

pub_type

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