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Plasma immunoreactive peptide histidine isoleucine (PHI) and vasoactive intestinal polypeptide (VIP) levels were measured by specific radioimmunoassays in urethane-anesthetized rats. Basal levels of plasma PHI-like immunoreactivity (PHI-LI) in the hypophysial portal blood were 414 +/- 180 pmol/l (means +/- S.E.), about 7 times higher than in the peripheral blood. VIP-like immunoreactivity (VIP-LI) was also high in the portal blood (399 +/- 139 pmol/l). The correlation coefficient between PHI-LI and VIP-LI was 0.76. These findings suggest that PHI and VIP are co-released from the median eminence into the hypophysial portal blood in rats.
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