Yawning responses induced by local hypoxia in the paraventricular nucleus of the rat
| Autor: | Mitsugu Oguri, Ichiro Kita, Hideho Arita, Ikuko Sato-Suzuki |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Male
medicine.medical_specialty Microinjections Central nervous system Glutamic Acid Nitric Oxide Brain Ischemia Nitric oxide Behavioral Neuroscience chemistry.chemical_compound Parvocellular cell Sodium Cyanide Internal medicine medicine Animals Nitric Oxide Donors Rats Wistar Hypoxia Electrocorticography Microinjection medicine.diagnostic_test Chemistry Anatomy Hypoxia (medical) Rats Electrophysiology Endocrinology medicine.anatomical_structure Hypothalamus Sensory Thresholds Yawning Stereotyped Behavior medicine.symptom Nitroso Compounds Paraventricular Hypothalamic Nucleus |
| Zdroj: | Behavioural Brain Research. 117:119-126 |
| ISSN: | 0166-4328 |
| DOI: | 10.1016/s0166-4328(00)00295-3 |
| Popis: | Yawing was induced by microinjections of L-glutamate, cyanide and a nitric oxide-releasing compound (NOC12) into the paraventricular nucleus of the hypothalamus (PVN) in anesthetized, spontaneously breathing rats. To evaluate physiological aspects of yawning, we monitored intercostal electromyogram (EMG) as an index of inspiratory activity, digastric EMG, blood pressure and electrocorticogram (ECoG). Microinjection of L-glutamate in the medial parvocellular subdivision (mp) elicited a stereotyped yawning response, i.e. an initial depressor response and an arousal shift in ECoG followed by a single large inspiration with mouth opening. The same sequential events were observed during spontaneous yawning, indicating that the mp is responsible for triggering yawning. Microinjection of cyanide into the mp caused the same yawning responses as the ones elicited by microinjection of L-glutamate, suggesting that the mp is sensitive to chemical hypoxia or ischemia within the PVN. Microinjection of NOC12 into the mp elicited a single large inspiration with a variable onset delay, suggesting that diffusible nitric oxide (NO) within the mp may act as a paracrine agent to cause a yawning response. We hypothesize that the mp of the PVN contains an oxygen sensor that causes a yawning response. |
| Databáze: | OpenAIRE |
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