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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Front+Physiol
2016 ; 7
(ä): 205
Nephropedia Template TP
gab.com Text
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English Wikipedia
Blockade of Rostral Ventrolateral Medulla (RVLM) Bombesin Receptor Type 1
Decreases Blood Pressure and Sympathetic Activity in Anesthetized Spontaneously
Hypertensive Rats
#MMPMID27313544
Pinto IS
; Mourão AA
; da Silva EF
; Camargo AS
; Marques SM
; Gomes KP
; Fajemiroye JO
; da Silva Reis AA
; Rebelo AC
; Ferreira-Neto ML
; Rosa DA
; Freiria-Oliveira AH
; Castro CH
; Colombari E
; Colugnati DB
; Pedrino GR
Front Physiol
2016[]; 7
(ä): 205
PMID27313544
show ga
Intrathecal injection of bombesin (BBS) promoted hypertensive and
sympathoexcitatory effects in normotensive (NT) rats. However, the involvement of
rostral ventrolateral medulla (RVLM) in these responses is still unclear. In the
present study, we investigated: (1) the effects of BBS injected bilaterally into
RVLM on cardiorespiratory and sympathetic activity in NT and spontaneously
hypertensive rats (SHR); (2) the contribution of RVLM BBS type 1 receptors (BB1)
to the maintenance of hypertension in SHR. Urethane-anesthetized rats (1.2 g ·
kg(-1), i.v.) were instrumented to record mean arterial pressure (MAP), diaphragm
(DIA) motor, and renal sympathetic nerve activity (RSNA). In NT rats and SHR, BBS
(0.3 mM) nanoinjected into RVLM increased MAP (33.9 ± 6.6 and 37.1 ± 4.5 mmHg,
respectively; p < 0.05) and RSNA (97.8 ± 12.9 and 84.5 ± 18.1%, respectively; p <
0.05). In SHR, BBS also increased DIA burst amplitude (115.3 ± 22.7%; p < 0.05).
BB1 receptors antagonist (BIM-23127; 3 mM) reduced MAP (-19.9 ± 4.4 mmHg; p <
0.05) and RSNA (-17.7 ± 3.8%; p < 0.05) in SHR, but not in NT rats (-2.5 ± 2.8
mmHg; -2.7 ± 5.6%, respectively). These results show that BBS can evoke
sympathoexcitatory and pressor responses by activating RVLM BB1 receptors. This
pathway might be involved in the maintenance of high levels of arterial blood
pressure in SHR.