Cannabinoid 1 receptors are expressed by nerve growth factor- and glial cell-derived neurotrophic factor-responsive primary sensory neurones

Neuroscience
J AhluwaliaIstvan Nagy

Abstract

Expression of the cannabinoid 1 (CB1) receptor and its regulation were studied in the different nociceptive and non-nociceptive sub-populations of cultured primary sensory neurones of adult rats. Bandairaea simplicifolia isolectin B4 (IB4) binding and calcitonin gene-related peptide (CGRP) immunostaining were used to distinguish between the glial cell-derived neurotrophic factor (GDNF)- and nerve growth factor (NGF)-responsive nociceptive and the non-nociceptive primary sensory neurones while a specific CB1 receptor antibody was used to study the expression of the CB1 receptor protein. About half of the total number of primary sensory neurones (47+/-3.2%) cultured for 1 day in the presence of both neurotrophic factors (50 ng/ml each) showed CB1 receptor-like immunostaining, whereas 21.8+/-3.3% and 32.7+/-5.6% of the neurones showed CGRP-like immunopositivity and IB4 binding, respectively. A proportion of the CB1 receptor-like immunopositive neurones was immunostained for CGRP (31.7+/-5%) and IB4 (48.2%+/-7.5), with a minimal (1%) co-expression of CGRP and IB4 binding. About a fifth of the CB1 receptor-like immunopositive neurones did not show either CGRP-like immunostaining or IB4 binding. To find out whether CB1 receptor expre...Continue Reading

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