Progesterone Increases Pituitary VIP Receptor Binding in Hens.

Gonzales, Sylvia Mae T.; Kawashima, Mitsuo; Kamiyoshi, Michiharu; Kuwayama, Takehito; Tanaka, Katuhide; Ichinoe, Kenji

doi:10.2141/jpsa.31.354

Cited by 1 publication

(2 citation statements)

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“…Although only White Legohorn was assessed, results of this study support the observations from VIP binding studies. Gonzales et al [40,41] have suggested that VIPRs may be located mainly in the cephalic lobe of the anterior pituitary gland, and specific VIP binding varies depending on the reproductive stages of the chicken. Thus, more mRNA for VIPR is expected in the incubation phase.…”

Section: Discussionmentioning

confidence: 99%

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Molecular Cloning of Chicken Vasoactive Intestinal Polypeptide Receptor Complementary DNA, Tissue Distribution and Chromosomal Localization1

Kansaku

Shimada

Ohkubo

et al. 2001

Biology of Reproduction

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Chicken vasoactive intestinal polypeptide receptor (VIPR) cDNA was cloned by the reverse transcription-polymerase chain reaction method using primers designed on the basis of other species of VIPR cDNA. The cDNA obtained was sequenced by the dideoxy-mediated chain-termination method. Of the 2227 nucleotides that were sequenced, 84, 855, and 1338 bases represent the 5'-untranslated region (UTR), the 3'-UTR, and the open reading frame that predicts a peptide of 446 amino acids. The cDNA of the chicken VIPR shows 65% and 60% homologies to human cDNA of VIP1 and VIP2 receptors, respectively. The clone had the expected similarity to highly conserved features of the other G protein-coupled receptors (GPCRs) such as six cysteine residues that are functionally important in the VIPR subfamily. In addition, the seven potential membrane-spanning domains characteristic of the family B group III GPCR superfamily and highly conserved motif within the third cellular loop between transmembrane regions 5 and 6. Northern blot hybridization analysis in this study indicated mRNA expression of VIPRs in the various tissues of the chicken. Strong signal was detected in the brain and anterior pituitary gland. High levels of VIPR mRNA in the brain was consistent with VIP-binding experiments and with the function of VIP in the brain as a neuroendocrine factor or neurotransmitter. Expression of VIPR was detected in the anterior pituitary gland of chick embryos. The expression of VIPR mRNA in the chick anterior pituitary gland may indicate a regulatory function of VIP on prolactin (PRL) production or PRL cell proliferation during embryogenesis. Chicken VIPR shows high homology with mammalian type I VIPR but, in some part, possesses similarity of amino acid sequence. Expression of VIPR in various tissues supports diverse functions for VIP in the chicken.

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Section: Discussionmentioning

confidence: 99%

“…In birds, the presence of VIP receptors in the anterior pituitary gland has been indicated in the turkey [39] and the chicken [40,41], and stimulation by VIP increased levels of intracellular cAMP in chicken anterior pituitary cells [23]. These studies suggested that the functional VIPRs may be located in the anterior pituitary gland.…”

Section: Introductionmentioning

confidence: 92%