Linked Life Data

20537519

Source:http://linkedlifedata.com/resource/pubmed/id/20537519

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2011-2-21
pubmed:abstractText
Previous studies reported that the age-related decline in testosterone biosynthesis is associated with a decrease in the steroidogenic acute regulatory (StAR) protein which regulates the rate-limiting step of testosterone biosynthesis. To explore the possibility of delaying this decline using a dietary approach, we have examined the effect of a natural flavonoid, apigenin, on StAR gene expression in mouse Leydig cells. Incubation of these cells with the flavonoid enhanced cyclic adenosine monophosphate (cAMP)-induced steroidogenesis and StAR protein expression. The results from the analyses of StAR mRNA by reverse transcription-polymerase chain reaction and the luciferase assays of StAR promoter activity indicated that this flavonoid enhanced StAR gene expression at the level of transcription. Further studies showed that apigenin blocked the thromboxane A2 receptor and interrupted the signaling through the cyclooxygenase-2-thromboxane A synthase-thromboxane A2-receptor pathway, resulting in a reduction of DAX-1 (dosage sensitive sex reversal-adrenal hypoplasia congenita critical region on the X chromosome, gene-1) protein, a transcriptional repressor of StAR gene expression. When DAX-1 protein was reduced, the sensitivity of the Leydig cells was dramatically enhanced, with sub-threshold level of cAMP being able to induce maximal levels of StAR protein expression and steroid hormone production. The present study suggests a potential application of apigenin to improve StAR protein expression and steroidogenic sensitivity of aging Leydig cells.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
1873-4847
pubmed:author
pubmed:copyrightInfo
Published by Elsevier Inc.
pubmed:issnType
Electronic
pubmed:volume
22
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
212-8
pubmed:meshHeading
pubmed-meshheading:20537519-Animals, pubmed-meshheading:20537519-Apigenin, pubmed-meshheading:20537519-Cell Line, Tumor, pubmed-meshheading:20537519-Cyclic AMP, pubmed-meshheading:20537519-Cyclooxygenase 2, pubmed-meshheading:20537519-DAX-1 Orphan Nuclear Receptor, pubmed-meshheading:20537519-Gene Expression Regulation, pubmed-meshheading:20537519-Humans, pubmed-meshheading:20537519-Leydig Cells, pubmed-meshheading:20537519-Male, pubmed-meshheading:20537519-Mice, pubmed-meshheading:20537519-Mice, Inbred C3H, pubmed-meshheading:20537519-Phosphoproteins, pubmed-meshheading:20537519-Prostaglandin H2, pubmed-meshheading:20537519-Receptors, Thromboxane A2, Prostaglandin H2, pubmed-meshheading:20537519-Signal Transduction, pubmed-meshheading:20537519-Steroids, pubmed-meshheading:20537519-Thromboxane-A Synthase
pubmed:year
2011
pubmed:articleTitle
Effects of apigenin on steroidogenesis and steroidogenic acute regulatory gene expression in mouse Leydig cells.
pubmed:affiliation
Garrison Institute on Aging, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA.
pubmed:publicationType
Journal Article, Research Support, N.I.H., Extramural