VIP and its homologous increase vascular conductance in certain endocrine and exocrine glands

Journal Article · Fri Apr 01 00:00:00 EST 1988 · American Journal of Physiology; (USA)

OSTI ID:6724927

Huffman, L J; Connors, J M; Hedge, G A ^[1]

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1. West Virginia Univ. Medical Center, Morgantown (USA)

The effects of vasoactive intestinal peptide (VIP) and related structural homologues on tissue vascular conductances were investigated in anesthetized male rats. VIP, peptide histidine isoleucine (PHI), secretin, growth hormone-releasing factor (GHRF), gastric inhibitory peptide (GIP), or saline was infused intravenously over 4 min. Tissue blood flows were measured during this time by use of {sup 141}Ce-labeled microspheres. Circulating thyrotropin (TSH), triiodothyronine (T{sub 3}), and thyroxine (T{sub 4}) levels were determined before and at 20 min and 2 h after treatment. Marked increases in thyroid, pancreatic, and salivary gland vascular Cs occurred during peptide infusion with the order of potency correlating with the degree of structural homology to VIP. PHI and secretin produced maximal increases in vascular Cs, which were the same as those obtained with VIP. Circulating TSH, T{sub 3}, and T{sub 4} levels were not different from values in saline-infused rats after peptide treatments that caused striking increases in thyroid vascular C. These observations indicate that the vascular beds of certain endocrine and exocrine glands are responsive to the vasodilatory action of VIP and related homologues with the order of potency corresponding to the degree of structural homology to VIP. These results are also consistent with the proposal that structural homologues of VIP act at the same vascular receptor as VIP. Alternative, the involvement of different vascular receptors, acting through the same mechanism at a level beyond the receptor site, cannot be excluded.

• OSTI ID: 6724927
• Journal Information: American Journal of Physiology; (USA), Vol. 254:4; ISSN 0002-9513
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
BLOOD FLOW
RADIOASSAY
PEPTIDES
BIOLOGICAL EFFECTS
THYROID HORMONES
RADIOIMMUNOASSAY
CERIUM 141
ENDOCRINE GLANDS
INTESTINES
IODINE 125
MALES
MICROSPHERES
RATS
SECRETIN
THYROXINE
TRIIODOTHYRONINE
VASODILATION
AMINO ACIDS
ANIMALS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOASSAY
BODY
CARBOXYLIC ACIDS
CERIUM ISOTOPES
DAYS LIVING RADIOISOTOPES
DIAGNOSTIC TECHNIQUES
DIGESTIVE SYSTEM
ELECTRON CAPTURE RADIOISOTOPES
EVEN-ODD NUCLEI
GASTROINTESTINAL TRACT
GLANDS
HORMONES
IMMUNOASSAY
IMMUNOLOGY
INTERMEDIATE MASS NUCLEI
IODINE ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
MAMMALS
NUCLEI
ODD-EVEN NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC IODINE COMPOUNDS
ORGANS
PEPTIDE HORMONES
PROTEINS
RADIOIMMUNODETECTION
RADIOIMMUNOLOGY
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
RODENTS
TRACER TECHNIQUES
VERTEBRATES
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