Mc. Breschi et al., BENZODIAZEPINE AGONISTS REVERSE THE EFFECTS OF NOISE EXPOSURE ON CENTRAL BENZODIAZEPINE RECEPTORS AND CARDIAC RESPONSIVENESS, Life sciences, 57(11), 1995, pp. 1131-1140
Citations number
35
Categorie Soggetti
Biology,"Medicine, Research & Experimental","Pharmacology & Pharmacy
Rats were submitted to 110 dB white noise exposure for 1, and 6 hours
and brain alpha(1), beta(1) and benzodiazepine receptor binding was ev
aluated with selective ligands. An increase in cerebral benzodiazepine
receptor (CBR) concentration, without any significant change in affin
ity constant, occurred after the 6 h treatment; no change was observed
in adrenergic receptor binding at any period of exposure. Both diazep
am and clonazepam pre-treatment reversed the effects of noise on CBR b
inding, confirming a role of these receptors in the response to noise
stress. Furthermore, these benzodiazepine agonists influenced the resp
onse of cardiac and aortic tissues, which are known to be changed by s
tress exposure. Diazepam and clonazepam pre-treatment protected cardia
c tissue from the effects of 6h noise stress, and a potentiation of ao
rtic responses was detected, although at different times of exposure.
The differences between the responses of these peripheral tissues to b
enzodiazepine treatment suggest that the expression depends on the tis
sue examined and the period of exposure.