Linked Life Data

2487277

Source:http://linkedlifedata.com/resource/pubmed/id/2487277

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1991-3-8
pubmed:abstractText
In frogs hypophysectomy causes cell proliferation in lens epithelium to subside entirely, with better than 95% of the cells arresting in G1. The phenomenon has been traced to the action of insulin-like growth factors (IGFs) whose synthesis depends on anterior pituitary hormones, most notably GH. Both GH and purified somatomedin C can reinitiate mitosis in the lenses of hypophysectomized frogs. The present studies were done to determine if growth of rat lenses is controlled as is that of amphibia. It appears this may not be so because hypophysectomy has no effect on division in the rodent system. Protein calorie malnutrition (PCM) reduced the mitotic index and this effect is much enhanced by pituitary ablation. Of interest too, were the observations that the glucocorticoid, dexamethansone, is inhibitory in frog; the effect in rat is uncertain. Injection of bovine pituitary powder has no influence on rat while stimulating the amphibian material. It is therefore possible to modify growth of rat lens epithelium in vivo but the regulating mechanism(s) appears to be distinct from that operating in frogs. Whether the difference(s) is inherent in the cells themselves or is to be sought in the access routes through which they are reached by blood borne factors (e.g. permeability of blood-aqueous barriers) is, at present, unclear.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
1042-6922
pubmed:author
pubmed:issnType
Print
pubmed:volume
6
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
675-86
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
A comparison of growth regulation of mammalian with amphibian lens epithelium.
pubmed:affiliation
Department of Biological Sciences, Fordham University, Bronx, New York 10458.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S.