Role of benzodiazepine and serotonergic mechanisms in conditioned freezing and antinociception using electrical stimulation of the dorsal periaqueductal gray as unconditioned stimulus in rats

2002 ◽  
Vol 165 (1) ◽  
pp. 77-85 ◽  
Author(s):  
Castilho V. ◽  
Macedo C. ◽  
Brandão M.
Keyword(s):  
Electrical Stimulation ◽  
Unconditioned Stimulus ◽  
Periaqueductal Gray ◽  
Dorsal Periaqueductal Gray ◽  
Conditioned Freezing ◽  
Stimulation Of

l-type calcium channels selectively control the defensive behaviors induced by electrical stimulation of dorsal periaqueductal gray and overlying collicular layers

2000 ◽  
Vol 111 (1-2) ◽  
pp. 175-185 ◽  
Author(s):  
Luiz Carlos Schenberg ◽  
Leonardo Pimentel de Almeida Marçal ◽  
Fabiana Seeberger ◽  
Maria Rufina de Barros ◽  
Eliana Cristina Murari Sudré
Keyword(s):  
Electrical Stimulation ◽  
Calcium Channels ◽  
Periaqueductal Gray ◽  
Dorsal Periaqueductal Gray ◽  
Defensive Behaviors ◽  
Stimulation Of

Role of periaqueductal gray in the pressor response produced by central injections of angiotensin II

1993 ◽  
Vol 265 (5) ◽  
pp. R1052-R1059
Author(s):  
L. R. Portis ◽  
S. J. Lewis ◽  
M. J. Brody
Keyword(s):  
Electrical Stimulation ◽  
Angiotensin Ii ◽  
Fluorescent Dyes ◽  
Pressor Response ◽  
Periaqueductal Gray ◽  
Ang Ii ◽  
Hemodynamic Responses ◽  
Anesthetized Rats ◽  
Stimulation Of

The present studies were undertaken to determine the role of rostral periaqueductal gray (PAG) in mediating the pressor effect produced by intracerebroventricular (icv) injection of angiotensin II (ANG II, 200 ng). Two functionally and anatomically distinct sites were identified in rostral PAG: a dorsomedial site involved in the hemodynamic responses produced by electrical stimulation of the anteroventral third ventricle (AV3V) region and a ventromedial site required for the pressor response elicited by icv administration of ANG II. In Saffan-anesthetized rats, injection of lidocaine (LIDO, 4%) in dorsomedial PAG, but not in ventromedial PAG, significantly attenuated the decrease in hindquarter resistance (HQR) produced by electrical stimulation of the AV3V region, and the poststimulatory increase in mean arterial pressure (MAP) and HQR. The injection of LIDO in ventromedial PAG had no effect on the hemodynamic responses produced by electrical stimulation of the AV3V region in anesthetized rats but significantly attenuated the pressor response produced by icv administration of ANG II in conscious rats. The hypothesis that these two sites receive separate projections was addressed by microinjecting two retrogradely transported fluorescent dyes, Fluoro-Gold and Fast Blue. The anatomic findings suggest that separation of the pathways activated by electrical and chemical stimulation of the AV3V region occurs at the level of rostral PAG.

Context fear conditioning inhibits panic-like behavior elicited by electrical stimulation of dorsal periaqueductal gray

Neuroreport ◽  
2003 ◽  
Vol 14 (12) ◽  
pp. 1641-1644 ◽  
Author(s):  
Valeska Magierek ◽  
Patrício L. Ramos ◽  
Nylson G. da Silveira-Filho ◽  
Regina L. Nogueira ◽  
J. Landeira-Fernandez
Keyword(s):  
Electrical Stimulation ◽  
Fear Conditioning ◽  
Periaqueductal Gray ◽  
Dorsal Periaqueductal Gray ◽  
Stimulation Of ◽  
Context Fear Conditioning
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