Dit is het abstract van het betreffende artikel.
1: J Biol Chem. 2006 Sep 1;281(35):25492-501. Epub 2006 Jun 27.
Elevated testosteron induces apoptosis in neuronal cells.
Estrada M, Varshney A, Ehrlich BE.
Department of Pharmacology and Cellular and Molecular Physiology, Yale
University, New Haven, Connecticut 06520,
USA.iestrada@med.uchile.cl
Testosterone plays a crucial role in neuronal function, but elevated
concentrations can have deleterious effects. Here we show that
supraphysiological levels of testosteron (micromolar range) initiate the
apoptotic cascade. We used three criteria, annexin V labeling, caspase activity,
and DNA fragmentation, to determine that apoptotic pathways were activated by
testosteron. Micromolar, but not nanomolar, testosteron concentrations
increased the response in all three assays of apoptosis. In addition,
testosteron induced different concentration-dependent Ca2+ signaling patterns:
at low concentrations of testosteron (100 nm), Ca2+ oscillations were produced,
whereas high concentrations (1-10 microm) induced a sustained Ca2+ increase.
Elevated testosteron concentrations increase cell death, and this effect was
abolished in the presence of either inhibitors of caspases or the inositol
1,4,5-trisphosphate receptor (InsP3R)-mediated Ca2+ release. Knockdown of InsP3R
type 1 with specific small interfering RNA also abolished the
testosteron-induced cell death and the prolonged Ca2+ signals. In contrast,
knockdown of InsP3R type 3 modified neither the apoptotic response nor the Ca2+
signals. These results support our hypothesis that elevated testosteron alters
InsP3R type 1-mediated intracellular Ca2+ signaling and that the prolonged Ca2+
signals lead to apoptotic cell death. These effects of testosteron on neurons
will have long term effects on brain function.
PMID: 16803879 [PubMed - in process]
Ik krijg alleen een vermoeden dat de gebruikte concentraties in geen verhouding staan met wat de meeste gebruiken.
* Male: 300-1,000 ng/dl 10,4 nM
* Female: 20-80 ng/dl 34,7 nM
Berekening nM met MW = 288.42 g/mol.
MedlinePlus Medical Encyclopedia: Testosterone
Hun gebruiken dus als lage dosis 100 nM --> geen effect dus
en bij hun hoge dosis van 1000 nM (1 microM) tot 10000 nM (10 microM) zien ze effect. Ik heb zo geen idee wat de concentratie moet zijn als je kuurt. Maar goed misschien kunnen jullie er iets meer.
Dit tijdschrift is wel redelijk goed. Echter als dit waterdicht zou zijn dan zou het wel in een ander tijdschrift staan.