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Nathan Goodyear

Serum sex steroids and steroidogenesis-relate... [Diabetes Metab. 2014] - PubMed - NCBI - 0 views

www.ncbi.nlm.nih.gov/...24792219

androgens Testosterone DHT DihydroTestosterone weight fat insulin SHBG diabetes men male hormone hormones low T

shared by Nathan Goodyear on 07 May 14 - No Cached
  • Nathan Goodyear on 07 May 14
     
    Overeating, which is a classical American diet, was found to increase weight, fat mass and fasting insulin.  In contrast, SHBG, Testosterone and DHT were decreased.  Enzymes responsible for androgen production i.e.3-beta-hydroxysteroid dehydrogenase and 17-beta-hydroxysteroiddehydrogenase, were decreased in muscles of those in this study.  These changes were more pronounced in those with a family h/o of diabetes.
Nathan Goodyear

Androgen deprivation promotes intratumoral synthesis of dihydrotestosterone from androg... - 0 views

www.nature.com/...srep01528.html

prostate cancer 3-alpha androstanediol 3-beta androstanediol DHT metabolite metabolites

shared by Nathan Goodyear on 27 Jan 14 - No Cached
  • PSA levels in media were increased by 3α-diol
  • Similarly to 3α-diol, 3β-diol also increased PSA levels in media in a concentration-dependent manner
  • intracellular DHT is synthesized from inactive androgen 3α- and 3β-diol via different pathways in prostate cancer cells
  • ...12 more annotations...
    • Nathan Goodyear
      Nathan Goodyear on 15 Jul 15
       
      error in statement: DHT metabolites are not inactive, they just don't activate AR.
  • 3β-diol can be a precursor of DHT in prostate cancer cells.
  • serum 3α-diol G levels reflect the androgen milieu in localized prostate cancer patients receiving ADT
  • A few studies reported that 3β-diol is a potential ligand of estrogen receptor β (ERβ) and has an antiproliferative effect
  • our results revealed that 3β-diol is potentially a precursor of DHT in prostate cancer cells
  • Bauman et al. showed that 3α-diol is inactive at AR, but induces prostate growth
  • Prostate cancer cells promoted synthesis from the DHT metabolite 3α-diol during the long duration of ADT
    • Nathan Goodyear
      Nathan Goodyear on 15 Jul 15
       
      the authors highlight the suggestion is that 3alpha-diol's activity is via 3alpha-HSD, but fail to mention that it is known that 3alpha-diol interacts with the ER-alpha in the prostate.
  • verified the synthesis of DHT from 3α- or 3β-diol via different pathways in prostate cancer cells in this study
  • HSD17B6 expression levels in prostate cancer can be useful for the diagnosis of high-risk prostate cancer
  • serum 3α-diol G levels reflect the adrenal androgen milieu in localized prostate cancer patients
  • 3α- and 3β-diol has a much more significant role in intratumoral androgen metabolism during ADT
  • Nathan Goodyear on 27 Jan 14
     
    DHT metabolites play an important role of intra-prostate DHT synthesis in those following ADT.  This is a proposed mechanism for the failure rate and aggressive nature of prostate cancer that fails ADT.   3-alpha androstanediol is converted via 3 alpha HSD back to DHT.  In contrast, 3-beta androstanediol cannot.
Nathan Goodyear

The Androgen 5α-Dihydrotestosterone and Its Metabolite 5α-Androstan-3β, 17β-D... - 0 views

www.jneurosci.org/...1448.full

DHT 3 beta androstanediol androgens Hypothalamus HPA hormones stress

shared by Nathan Goodyear on 15 Jul 15 - No Cached
  • Sex steroid hormones are primarily responsible for sex difference in adult HPA function; androgens inhibit whereas estrogens enhance HPA axis activation after a stressor
  • the PVN contains relatively high levels of AR (Bingaman et al., 1994; Zhou et al., 1994) and ERβ (Alves et al., 1998; Hrabovszky et al., 1998; Somponpun and Sladek, 2003) but is essentially devoid of ERα
  • the nonaromatizable androgen DHT and the nonselective ER ligand E2 influence HPA reactivity by acting on neurons within or surrounding the PVN
  • ...9 more annotations...
  • inhibitory action of DHT is detectable at both the level of hormone secretion as well as PVN c-fos mRNA expression
  • the inhibition can be mimicked by the DHT metabolite 3β-diol and by the subtype selective ERβ agonist DPN
  • E2 acts to enhance HPA reactivity
  • the ability of the ER antagonist tamoxifen, but not the AR antagonist flutamide, to block the inhibitory actions of DHT, speaks to the intracellular mechanism by which this inhibitory signal might be transduced.
    • Nathan Goodyear
      Nathan Goodyear on 15 Jul 15
       
      that is because the interaction with the DHT metabolite is not with the AR, but with the ER-beta.
  • the DHT metabolite 3β-diol and the ERβ-subtype-selective agonist DPN suppressed ACTH, corticosterone, and c-fos mRNA responses to restraint stress in a manner similar to DHT
  • metabolism of DHT to 3β-diol and subsequent binding to ERβ can be inhibitory to HPA reactivity, and this is one possible mechanism for the action of DHT.
  • Our data also suggest that E2 enhances the reactivity of the HPA axis to stress by acting on or near neurons of the PVN
  • the actions of E2 appear to be through an ERα-dependent mechanism
  • these studies suggest that ERβ, within the male hypothalamus, acts to inhibit the HPA axis and that the inhibitory effects of DHT may be, at least in part, via its intracellular conversion to 3β-diol and subsequent binding to ERβ
  • Nathan Goodyear on 15 Jul 15
     
    DHT metabolites: particularly 3beta-androstanediol inhibit HPA axis through ER-beta.
Nathan Goodyear

Dihydrotestosterone Promotes Vascular Cell Adhesion Molecule-1 Expression in ... - 0 views

endo.endojournals.org/...1889.long

VCAM-1 DHT male men hormone hormones

shared by Nathan Goodyear on 06 Nov 13 - No Cached
  • Nathan Goodyear on 06 Nov 13
     
    DHT found to be associated with an increase in VCAM-1.
Nathan Goodyear

Anemia in patients on combined androgen block therapy for prostate cancer - 0 views

www.asiaandro.com/...383.htm

testosterone DHT anemia men hematocrit androgens

shared by Nathan Goodyear on 02 Sep 11 - No Cached
  • testosterone and 5b-dihydrotestosterone stimulate erythropoietin production in laboratory animals [2]. Before the discovery of recombinant erythropoietin, androgens were used clinically to improve haematocrit levels in anaemic patients
  • Nathan Goodyear on 02 Sep 11
     
    Testosterone and DHT increase hematocrit in men with anemia
Nathan Goodyear

Dihydrotestosterone upregulates the expression of epidermal growth factor receptor and ... - 0 views

erc.endocrinology-journals.org/...451.short

bladder cancer bladder cancer androgen receptor androgen receptors AR androgen receptor receptors EGFR epidermal growth factor receptor

shared by Nathan Goodyear on 05 Jan 15 - No Cached
  • Nathan Goodyear on 05 Jan 15
     
    Androgen receptors may be associated with bladder cancer progression.  This study finds AR up regulates Epidermal growth factor in bladder cancer cells.
Nathan Goodyear

Androgens are bronchoactive drugs that act by relaxing airway smooth muscle and prevent... - 0 views

joe.endocrinology-journals.org/...1.abstract

low T Testosterone metabolites asthma dihydrotestosterone

shared by Nathan Goodyear on 09 Jul 14 - No Cached
  • Nathan Goodyear on 09 Jul 14
     
    Androgens relax smooth muscles of airways in men with asthma.  The metabolite 5beta-DHT was the most potent in this action.  This has implications in men with low T and asthma.  
Nathan Goodyear

Sulforaphane promotes murine hair growth by accelerating the degradation of dihydrotest... - 0 views

www.ncbi.nlm.nih.gov/...26923074

DHT dihdyrotestosterone sulforaphane hormones hair

shared by Nathan Goodyear on 05 Apr 16 - No Cached
  • Nathan Goodyear on 05 Apr 16
     
    sulforaphane reduces DHT through increased metabolism of DHT.
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