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The nucleus tractus solitarius (NTS) is a major integrative site in the brain stem involved in central autonomic control. Several lines of evidence indicate that ATP, acting at P2x purinoceptors, and adenosine, acting at A2a adenosine (P1) purinoceptors, play synchronous roles as transmitter substances in NTS-mediated mechanisms of cardiovascular control.(More)
The purpose of the study was to examine the role of P2 purinergic receptors in mechanisms of cardiovascular control mediated by the nucleus tractus solitarius (NTS), a major integrative site in the brainstem involved in the reflex coordination of cardiorespiratory and visceral response patterns. Microinjections of ATP and its analogues were made into the(More)
Neuropeptide Y (NPY) has been shown to be localized in a number of CNS regions, including the nucleus tractus solitarius (NTS). In this meeting report, a brief overview is presented of recent studies from our laboratory examining the role of NPY in NTS-mediated mechanisms of cardiorespiratory and visceroendocrine regulation. Microinjections of NPY, NPY(More)
Male Long-Evans rats were stereotaxically implanted with a bipolar electrode in the central amygdala and with a stainless-steel cannula in the lateral cerebral ventricle. Rats were then kindled once daily until 3 consecutive Stage 5 kindled seizures were elicited. Adenosine analogues were injected into the lateral cerebral ventricle to examine their effects(More)
Rat dorsomedial medullary brain segments containing primarily nucleus tractus solitarius (NTS) were employed for slice superfusion studies of electrically evoked [3H]serotonin ([3H]5-HT) release. Individual slices loaded with [3H]5-HT were stimulated two times, S1 and S2, at 3 Hz, 25 mA, 2 ms pulses for 1 min. Control NTS slices had a S2/S1 ratio of 0.94(More)
Mice implanted with chronic indwelling cannulas were injected in the lateral cerebral ventricle with a series of adenosine analogs and the effects on spontaneous locomotor activity were recorded. All analogs produced dose-related decreases in locomotor activity. The relative order of potency for locomotor depression was: NECA much greater than L-PIA greater(More)
Rat medullary brain segments containing primarily nucleus tractus solitarius (NTS) were used for superfusion studies of evoked transmitter release and for isotherm receptor binding assays. Isotherm binding assays with [3H]CGS-21680 on membranes prepared from NTS tissue blocks indicated a single high-affinity binding site with a KD of 5.1 +/- 1.4 nM and a(More)
In anesthetized, spontaneously breathing rats, microinjections of selective agonists of neuropeptide Y (NPY) receptor subtypes were made into the medial region of the caudal nucleus of the solitary tract (NTS) at the level of the area postrema. This region of the rat NTS exhibits very high densities of NPY binding sites. Microinjections of the long(More)