Microinjection of bicuculline into the RVLM of the OVX and OVX+E rats led to a significant increase on the MAP with no significant effect on HR compared with their pre-injection value (OVX: ΔMAP: 30.4±5.2 mmHg and ΔHR: 12.2.0±8.3 bpm; OVX+E: ΔMAP: 35.95±4.4 mmHg and ΔHR: 9.2±6.11 bpm, P<0.01). Similar to pervious experiments, 10 minutes later, glutamate was injected into the BST of the OVX and OVX+E rats. The depressor Inhibitors,research,lifescience,medical and bradycardic responses caused by stimulation of the BST were similar to those of the pervious experiments

(OVX: ΔMAP: -22.5±2.68 mmHg and ΔHR: -12.2±2.1 bpm; OVX+E: ΔMAP: -28.1±3.7 mmHg and ΔHR: -14.2±3.5 bpm, P<0.01, t test). The magnitude of depressor response during stimulation of the BST 10 minutes after bicuculline microinjection Inhibitors,research,lifescience,medical into the RVLM were reduced to almost 50% of their control value (OVX: ΔMAP: -11.9±3.3 mmHg and ΔHR: -10.0±2.5 bpm; OVX+E: ΔMAP: -16.3±2.4 mmHg and ΔHR: -7.5±1.7 bpm, P<0.01). 60 min after the microinjection of bicuculline into the RVLM, the magnitude of depressor and bradycardic responses by re-stimulation of the BST approximately returned to their control value (OVX: ΔMAP: -15.8±3.7 mmHg and ΔHR: -9.0±4.5 bpm; OVX+E: ΔMAP: -23.0±3.6 mmHg and ΔHR: -12.5±2.5 bpm, figures 6

Inhibitors,research,lifescience,medical and ​and7).7). Figure 6 This figure shows tracings of blood pressure and heart rate responses elicited by microinjection of glutamate into the BST before (control) and after injection of bicuculline Inhibitors,research,lifescience,medical (1 mM/50 nl) into the RVLM and re-stimulation of BST at 10 and 60 minutes after … Figure 7 This figure shows the cardiovascular effect of glutamate (0.25 M/20 nl) injection into the BST before (control) and 10, 20, 40, and 60 min after injection of bicuculline into the RVLM in OVX and OVX+E rats. *Significant difference with pre-injection Doxorubicin values … Cardiovascular Response Elicited by Glutamate Injected into the BST after the Injection

of Phaclophen in the RVLM To find the possible effects of GABAB receptors of the RVLM on the cardiovascular responses of the BST, phaclophen, a GABAB antagonist, Inhibitors,research,lifescience,medical was microinjected into the RVLM of the OVX and OVX+E Chlormezanone rats. No significant difference was found in both MAP and HR compared with their pre-injection values (OVX: ΔMAP: 4.3±1.1 mmHg and ΔHR: 3.3±2.1 bpm; OVX+E: ΔMAP: 6.9±1.4 mmHg and ΔHR: 8.7±3.2 bpm). Similar to pervious experiments, microinjection of glutamate into the BST elicited bradycardic and depressor responses (OVX: ΔMAP: -26.1±3.0 mmHg and ΔHR: -16.9±3.1 bpm; OVX+E: ΔMAP: -26.8±2.62 mmHg and ΔHR: -13.6±5 bpm, P<0.01, t test). Unlike the effect of bicuculline, microinjection of phaclophen did not alter the magnitude of depressor and bradycardic responses by re-stimulation of the BST, 10, 20, 40, and 60 minutes after microinjection of phaclophen into the cardiovascular site of RVLM (figures 8 and ​and99).