bicuculline/hemorragia

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Hemorrhage activates catecholaminergic neurons sensitive to GABA in the nucleus of the solitary tract with ascending projections to the subfornical organ in rats.

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The activity of neurons in the region of the nucleus of the solitary tract (NTS) that were antidromically identified by electrical stimulation of the rat subfornical organ (SFO) was tested for a response to microiontophoretic application of gamma-aminobutyric acid (GABA), hemorrhage (10 ml/kg

[Afobazole effect on cerebral circulation under hemorrhagic stroke model conditions].

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Narcotized rats under hemorrhagic stroke model conditions exhibit a significant decrease in the cerebral flow in the region of contralateral cerebral hemisphere symmetric to the zone of lesion. Under these conditions, afobazole produced a significant increase in the local circulation in cerebral

Superoxide production in experimental seizures in cats.

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OBJECTIVE Seizures cause cerebrovascular responses similar to those seen in conditions such as acute hypertension, ischemia/reperfusion, or fluid-percussion brain injury, which are associated with the generation of superoxide. Accordingly, we studied production of superoxide in experimental

Effects of GABAergic drugs on ethanol-induced gastric lesions.

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Different classes of GABAergic drugs--baclofen, GABA, muscimol, Na-valproate, Mg-valproate and diazepam--were tested per os on ethanol-induced gastric lesions in rats. The GABAB agonist baclofen failed to affect gastric susceptibility to ethanol damage, while all the other compounds exerted a

[Mechanism of the cerebrovascular effect of piracetam].

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Piracetam produces a more pronounced effect on cerebral circulation disturbed by hemorrhagic shock as compared with intact animals. Piracetam has a depressant effect on the nervous regulation of cerebral circulation by suppressing the reflex constriction of the vessels in both arterial systems of

Autoregulation of cerebral blood flow. Effect of phenobarbital and pancuronium in the newborn piglet.

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The effect of phenobarbital and pancuronium on cerebral blood flow (CBF) and CBF autoregulation are studied in newborn piglets after chemically induced seizures with bicuculline. Given 3 or 15 min after the onset of seizures, phenobarbital significantly reduces CBF (59 +/- 11 and 56 +/- 17 vs. 84

Medullary pathways for adrenocorticotropic hormone and vasopressin secretion in rabbits.

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We determined, in urethan-anesthetized rabbits, whether pharmacological alteration of neuronal function in the ventrolateral medulla oblongata, including the A1 area, and in the nucleus tractus solitarii (NTS), alters plasma adrenocorticotropic hormone (ACTH) and vasopressin and whether inhibition

Changes in vasopressin release and autonomic function induced by manipulating forebrain GABAergic signaling under euvolemia and hypovolemia in conscious rats.

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The anteroventral third ventricular region (AV3V) is a pivotal area for osmotic responses and integration of autonomic functions. The purpose of this study was to investigate whether the gamma-aminobutyric acid (GABA)-ergic activity in the AV3V may be involved in the regulation of arginine

Dual effect of electrochemical stimulation of the medial preoptic area on the release of LH: possible neurotransmitter involvement.

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Electrochemical and electrical stimulation of the medial preoptic area (MPA) was shown to induce release of LH in rats. Owing to differences in cytoarchitecture and neural afferents between the medial (mMPA) and lateral (lMPA) parts of the MPA, we decided to explore whether this difference in

Evaluation for roles of neurosteroids in modulating forebrain mechanisms controlling vasopressin secretion and related phenomena in conscious rats.

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Anteroventral third ventricular region (AV3V) that regulates autonomic functions through a GABAergic mechanism possesses neuroactive steroid (NS)-synthesizing ability. Although NS can exert effects by acting on a certain type of GABAA-receptor (R), it is not clear whether NS may operate to modulate

Mechanisms of protection against stroke in stroke-prone spontaneously hypertensive rats.

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The purpose of this study was to examine mechanisms by which sympathetic nerves protect against cerebral hemorrhage and ischemic infarction (i.e., "stroke") in stroke-prone spontaneously hypertensive rats (SHRSP). When unilateral superior cervical ganglionectomy was performed in SHRSP at 1 mo of

Allopregnanolone Effects on Transmission in the Brain Stem Solitary Tract Nucleus (NTS).

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During pregnancy, the progesterone metabolite, allopregnanolone (ALLO), becomes elevated and has been associated with altered levels within the CNS and resulting changes in GABAA receptor function. Pregnant animals poorly compensate reflexes for a decrease in blood pressure during hemorrhage.

Opioid innervation of the caudal ventrolateral medulla is not critical for the expression of the aortic depressor nerve response in the rabbit.

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We investigated the influence of endogenous opioids in the caudal ventrolateral medulla (CVLM) on the expression of the baroreflex response induced by the electrical stimulation (50 Hz, 0.2 ms, 11 V, 10 s) of the aortic depressor nerve. We used microinjection of selective opioid antagonists into the

Persistence of impaired autoregulation of cerebral blood flow in the postictal period in piglets.

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Cerebral blood flow (CBF) autoregulation was evaluated in the postictal period in unanesthetized term newborn piglets with a mean age of 5.7 +/- 3 days. Seven animals (group 1) received 1 mg/kg bicuculline to induce brief generalized seizures, and six control animals (group II) received saline.

Alleviation of Mechanical Allodynia by 14,15-Epoxyeicosatrienoic Acid in a Central Poststroke Pain Model: Possible Role of Allopregnanolone and δ-Subunit-Containing Gamma-Aminobutyric Acid A Receptors.

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Central poststroke pain (CPSP) is a neuropathic pain syndrome arising after a lesion of the central nervous system owing to cerebrovascular insult. Impaired daily activities and reduced quality of life in people suffering from CPSP justify the need for improved treatment. The detailed mechanism of

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