Linked Life Data

12791677

Source:http://linkedlifedata.com/resource/pubmed/id/12791677

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2003-11-20
pubmed:abstractText
Parathyroid hormone-related protein (PTHrP) promotes or suppresses apoptosis in various settings depending on cell type and context. PTHrP 1-34 and PTHrP 67-86 are type II cell growth factors with effects on pneumocyte growth and surfactant secretion. This study investigated the effects of 24 h pretreatment with these two peptides on rat type II cell apoptosis after 0.3 J/cm2 ultraviolet-B irradiation. Adherent cells decreased in number by 15 +/- 5% and nonadherent cells increased > 5-fold 24 h after ultraviolet irradiation. Cell loss was due predominantly to apoptosis, based on ethidium bromide exclusion, nuclear condensation, and caspase 3 activity. Nuclear condensation increased from 15.6 +/- 2.2% of irradiated cells with no treatment to 25.6 +/- 4.9 and 22.9 +/- 1.8% of cells in ultraviolet/PTHrP 1-34 and ultraviolet/PTHrP 67-86 groups, respectively (P < 0.01), along with a 60% increase in caspase 3 activity. Effects on apoptosis were unaffected by the presence or absence of serum, but were ameliorated by growth to confluence or adherence to fibronectin. PTHrP 1-34 and PTHrP 67-86 augmented inositol phosphate levels, but had minimal effects on cAMP. Thus, PTHrP 1-34 and PTHrP 67-86 sensitize type II cells to apoptosis, possibly by a phospholipase C-dependent mechanism. The effects appear to be regulated by cell-matrix and cell-cell interactions.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
1044-1549
pubmed:author
pubmed:issnType
Print
pubmed:volume
29
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
733-42
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
Proapoptotic effects of parathyroid hormone-related protein in type II pneumocytes.
pubmed:affiliation
VA Medical Center (125), 3350 La Jolla Village Dr., San Diego, CA 92161-5085, USA. rhhastings@ucsd.edu
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't