Linked Life Data

15247035

Source:http://linkedlifedata.com/resource/pubmed/id/15247035

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PredicateObject
rdf:type
lifeskim:mentions
pubmed:dateCreated
2004-7-12
pubmed:abstractText
Reduced signaling of the growth hormone (GH)/insulin-like growth factor-1(IGF-1)/insulin pathway is associated with extended life span in several species. Ames dwarf mice are GH and IGF-1 deficient and live 50-64% longer than wild-type littermates (males and females, respectively). Previously, we have shown that Ames mice exhibit elevated levels of antioxidative enzymes and lower oxidative damage. To further explore the relationship between GH and antioxidant expression, we administered GH or saline to dwarf mice and evaluated components of the glutathione (GSH) synthesis and degradation system. Growth hormone treatment significantly elevated kidney gamma-glutamyl-cysteine synthetase protein levels in 3- and 12-month-old dwarf mice. In contrast, the activity of the GSH degradation enzyme, gamma-glutamyl transpeptidase, was suppressed by GH administration in brain (P <.05), kidney (P <.01), heart (P <.005), and liver (P <.06). Activity levels of the detoxification enzyme, glutathione-S-transferase, were also suppressed in kidney tissues at 3 and 12 months of age and in 12-month-old dwarf liver tissues (P <.05). Taken together, the current results along with data from previous studies support a role for growth hormone in the regulation of antioxidative defense and, ultimately, life span in organisms with altered GH or IGF-1 signaling.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0077-8923
pubmed:author
pubmed:issnType
Print
pubmed:volume
1019
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
317-20
pubmed:dateRevised
2004-11-17
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
Growth hormone alters components of the glutathione metabolic pathway in Ames dwarf mice.
pubmed:affiliation
Department of Pharmacology, Physiology, and Therapeutics, University of North Dakota School of Medicine and Health Sciences, 501 N. Columbia Road, Grand Forks, ND 58203, USA. brownbrg@medicine.nodak.edu
pubmed:publicationType
Journal Article