Abstract:
:In an attempt to understand the changes of circulating neuropeptide Y (NPY) during hypoxia, the plasma level of NPY was investigated by radioimmunoassay. Exposure of rats to hypobaric hypoxia at an altitude of 18,000 ft for 4 weeks causes an increase of pulmonary pressure and an elevation of plasma NPY-like immunoreactivity (NPY-LI). However, the systemic blood pressure was not elevated by this chronic hypoxia. Also, plasma noradrenaline (NA) estimated by chromatographic analysis (HPLC-ECD) was not markedly raised. Failure of bretylium and guanethidine, sympathetic neuron blockers, in reducing the plasma NPY-LI level of these rats ruled out the participation of adrenergic nervous terminals. Adrenal medulla seems responsible for this elevation of plasma NPY-LI because this magnitude disappeared in adrenalectomized rats. These data suggest that chronic hypoxia induced an elevation of circulating NPY from the adrenal gland of rats.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Cheng JT,Chen CF,Shum AY,Wang JY,Chen HIdoi
10.1016/0304-3940(92)90105-gkeywords:
subject
Has Abstractpub_date
1992-06-22 00:00:00pages
211-4issue
2eissn
0304-3940issn
1872-7972pii
0304-3940(92)90105-Gjournal_volume
140pub_type
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