Linked Life Data

6290290

Source:http://linkedlifedata.com/resource/pubmed/id/6290290

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1982-12-18
pubmed:abstractText
Several forms of phosphodiesterase are present in the male gonad, and their relative concentrations vary during testicular development. On the basis of kinetic analysis and chromatography on DEAE cellulose, 3 forms were separated: (a) a high-affinity cGMP phosphodiesterase, regulated by Ca2+ and calmodulin, similar to a form described in different tissues (peak I); (b) a high-affinity cAMP form insensitive to Ca2+, which cannot be readily compared with forms described elsewhere (peak II); and (c) a high-affinity cAMP phosphodiesterase, Ca2+- and calmodulin-insensitive, corresponding to the "hormone-regulated" form described in several systems (peak III). The elution pattern of peak I and calmodulin stimulation were dependent on free calcium concentration during cytosol preparation and chromatography. This datum and rechromatography in the presence or absence of excess calmodulin suggested that the enzyme complexes calmodulin in a Ca2+-dependent manner and is therefore activated. Moreover, whereas peak I was observed in all cell compartments of the testis, peak II was present in germ cells and peak III was found mainly in somatic cells. During development of the testis, a relevant enhancement in the ratio between cAMP and cGMP hydrolytic activity was observed together with an overall increase of phosphodiesterase activity, thus suggesting that the previously described increase in cAMP phosphodiesterase activity during testis maturation should be ascribed to forms present in both germ cells and somatic cells.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0303-7207
pubmed:author
pubmed:issnType
Print
pubmed:volume
28
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
37-53
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1982
pubmed:articleTitle
Cyclic nucleotide phosphodiesterase in developing rat testis. Identification of somatic and germ-cell forms.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, Non-U.S. Gov't