Linked Life Data

12060855

Source:http://linkedlifedata.com/resource/pubmed/id/12060855

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2002-6-12
pubmed:abstractText
Compelling evidence indicates that the active growth of immature rat adrenal glands is sustained not only by an increased release of pituitary ACTH, but also by other ancillary mechanisms. We investigated whether vasoactive intestinal peptide (VIP), atrial natriuretic peptide (ANP), adrenomedullin (ADM) and proadrenomedullin N-terminal 20 peptide (PAMP) play a relevant role in these mechanisms. These four regulatory peptides were chosen because previous studies demonstrated that they are expressed in rat adrenals and are able to modulate the secretory activity and growth of zona glomerulosa (ZG), i.e., the adrenal layer. Groups of immature (20-day old) rats were given three subcutaneous injections (28, 16 and 4 h before sacrifice) of 2 nmol/100 g of the four peptides and/or selective antagonists of their receptors (VIP-A, ANP-A, ADM-A and PAMP-A), and 0.1 mg/100 g vincristin 3 h before autopsy. Adrenal glands were collected, processed for light microscopy, and the mitotic index (MI; percentage of metaphase-arrested cells) was evaluated in the subcapsular ZG. Neither VIP nor VIP-A affected MI. Both ANP and ANP-A decreased MI and their effects displayed additivity. ADM and PAMP raised MI and the effect was abolished by ADM-A and PAMP-A, respectively. When administered alone ADM-A, but not PAMP-A, significantly lowered MI. Collectively, our findings suggest that: i) neither VIP nor PAMP are involved in the regulation of immature rat adrenals; ii) ANP exerts a non-receptor-mediated inhibitory action, whose physiological relevance remains to be investigated; and iii) endogenous ADM system plays a relevant role in the mechanisms underlying the maintenance of high growth rate during adrenal maturation.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
1107-3756
pubmed:author
pubmed:issnType
Print
pubmed:volume
10
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
81-4
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2002
pubmed:articleTitle
Investigation of the effect of different regulatory peptides on adrenocortical cell proliferation in immature rats: evidence that endogenous adrenomedullin exerts a stimulating action.
pubmed:affiliation
Department of Histology and Embryology, School of Medicine, PL-60781 Poznan, Poland.
pubmed:publicationType
Journal Article