Document Detail


Galanin and vasoactive intestinal polypeptide are colocalised with classical pituitary hormones and show plasticity of expression.
MedLine Citation:
PMID:  2482279     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The identity of galanin- and vasoactive intestinal polypeptide-(VIP) immunoreactive (IR) cells in the rat anterior pituitary was investigated using immunocytochemistry and, since levels of both peptides are stimulated by oestrogen, the effect of oestrogen treatment and gonadectomy on the expression of both peptides was examined. In normal male rats, few galanin-IR and very few VIP-IR cells were found. Colocalisation studies performed on 2-microns serial paraffin sections revealed that in these animals galanin IR was present in somatotrophs and thyrotrophs. In normal females in dioestrus many lactotrophs, in addition to somatotrophs and thyrotrophs, expressed galanin, but very few VIP-IR cells were seen. In cryostat sections of normal rat pituitaries, slightly more VIP-IR cells were present. Oestrogen treatment in females produced an increase in frequency of galanin-IR cells, the vast majority of which were lactotrophs, and more VIP-IR cells, identified as lactotrophs, also appeared. VIP was present in a subset of galanin-IR lactotrophs after oestrogen treatment. After ovariectomy female pituitaries resembled those of normal males, with few galanin positive cells none of which were lactotrophs, and hardly any VIP-IR cells. Thus these two peptides are present in specific endocrine cell types of rat anterior pituitary and display plasticity of expression in different cell types under the influence of oestrogen. Their roles in control of pituitary hormone secretion are supported by these findings, and it is possible that both peptides act in a paracrine fashion within the pituitary.
Authors:
J H Steel; G Gon; D J O'Halloran; P M Jones; N Yanaihara; H Ishikawa; S R Bloom; J M Polak
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Histochemistry     Volume:  93     ISSN:  0301-5564     ISO Abbreviation:  Histochemistry     Publication Date:  1989  
Date Detail:
Created Date:  1990-03-14     Completed Date:  1990-03-14     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0411300     Medline TA:  Histochemistry     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  183-9     Citation Subset:  IM    
Affiliation:
Department of Histochemistry, Royal Postgraduate Medical School, Hammersmith Hospital, London, England.
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MeSH Terms
Descriptor/Qualifier:
Animals
Estradiol / pharmacology*
Female
Frozen Sections
Galanin
Immunohistochemistry
Male
Ovariectomy
Paraffin
Peptides / analysis*,  metabolism
Pituitary Gland, Anterior / analysis*,  cytology
Pituitary Hormones / analysis*
Rats
Rats, Inbred Strains
Vasoactive Intestinal Peptide / analysis*,  metabolism
Chemical
Reg. No./Substance:
0/Peptides; 0/Pituitary Hormones; 37221-79-7/Vasoactive Intestinal Peptide; 50-28-2/Estradiol; 8002-74-2/Paraffin; 88813-36-9/Galanin

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