Skip to main content

Home/ Dr. Goodyear/ Group items matching "deprivation" in title, tags, annotations or url

Group items matching
in title, tags, annotations or url

Sort By: Relevance | Date Filter: All | Bookmarks | Topics Simple Middle
Nathan Goodyear

Androgen deprivation therapy in men with prostate cancer: how should the side effects be monitored and treated? - Grossmann - 2011 - Clinical Endocrinology - Wiley Online Library - 0 views

  •  
    Androgen deprivation therapy in men has been shown to worsen insulin resistance and precipitate type II Diabetes as well as stimulate weight gain.  This suggests a cause effect relationship between Testosterone and insulin sensitivity.  Other studies have pointed to a reciprocal decline in Testosterone due to hyperglycemia--both acute and chronic.   Androgen deprivation has a significant long list of cardiovascular risks and this should be discussed with the patient.
Nathan Goodyear

Androgen Deprivation Therapy, Insulin Resistance, and Cardiovascular Mortality: An Inconvenient Truth - Basaria - 2013 - Journal of Andrology - Wiley Online Library - 0 views

  •  
    Androgen deprivation therapy is associated with increased diabetes, metabolic syndrome, insulin resistance, and cardiovascular mortality.  The longer the duration of therapy, the more the progression of metabolic dysfunction.  This process seems similar to chemotherapy i.e. secondary cancer due to chemotherapy.  The treatment of one disease, prostate cancer in this case, leads to an increase in the risk of the #1 killer in men--logic seems severely flawed there.
Nathan Goodyear

Changes in body composition during a... [J Clin Endocrinol Metab. 2002] - PubMed - NCBI - 0 views

  •  
    Androgen deprivation therapy was found to decrease lean muscle mass and increase abdominal adipose tissue, not visceral.  Significant change in body composition in men depleted of androgens in androgen deprivation therapy.
Nathan Goodyear

Chronic Testosterone Replacement Exerts Cardioprotection against Cardiac Ischemia-Reperfusion Injury by Attenuating Mitochondrial Dysfunction in Testosterone-Deprived Rats - 0 views

  • In this study, the cardioprotective effects of testosterone in testosterone-deprived rats heart with I/R injury were demonstrated
  • Prior to I/R injury, testosterone replacement provided cardioprotective effects in testosterone-deprived rats as indicated by (1) improved cardiac functions by markedly preserved %EF and %FS, and (2) attenuated cardiac sympathovagal imbalance by a markedly decreased LF/HF ratio
  • Testosterone replacement exerts cardioprotective effects by improving left ventricular function and cardiac sympathovagal balance impaired by testosterone deprivation in ORX rats
  • ...3 more annotations...
  • During the I/R period, testosterone replacement in ORX rats exerted the beneficial effects as indicated by (1) improved left ventricular pressure; (2) markedly decreased infarct size; (3) reduced fatal cardiac arrhythmias by increased time to 1st VT/VF onset and reduced arrhythmia scores; and (4) attenuated cardiac mitochondrial dysfunction caused by I/R injury by reducing ROS production, cardiac mitochondrial swelling and mitochondria membrane depolarization.
  • Chronic testosterone replacement also ameliorates left ventricular dysfunction, and reduces the infarct size and cardiac arrhythmias impaired by I/R injury under testosterone-deprived conditions
  • The mechanisms responsible for these beneficial effects of testosterone could be due to its ability to attenuate cardiac mitochondrial dysfunction and cardiomyocyte apoptosis
  •  
    animal study finds that Testosterone therapy is cardioprotective in a preventative mode and with myocardial injury.  Normalization of Testosterone in these animals with low T reduced infant injury size and improved heart function.  
Nathan Goodyear

Estrogen receptor β and the progression of prostate cancer: role of 5α-androstane-3β,17β-diol - 0 views

  • In the prostate, ERβ is highly expressed in the epithelial compartment, where it is the prevailing isoform
  • In the gland, DHT may be either reversibly 3α- or irreversibly 3β-hydroxylated by the different 3α- and 3β-hydroxysteroid dehydrogenases respectively (Steckelbroeck et al. 2004); these transformations generate two metabolites respectively 3α-diol and 3β-Adiol, which are both unable to bind the AR. Instead, 3β-Adiol displays a high affinity for ERβ (Kuiper et al. 1998, Nilsson et al. 2001), and it has been proposed that this metabolite may play a key role in prostate development
  • ERβ signaling, in contrast to ERα, seems to act as a suppressor of prostate growth, and may be positively involved in breast cancer
  • ...4 more annotations...
  • 3β-Adiol counteracts PC cell proliferation in vitro
  • 3β-Adiol counteracts the biological actions of its androgenic precursors testosterone and DHT
  • functional antagonism of 3β-Adiol appears to be molecularly independent from the activation of the androgenic pathway
  • the action of 3β-Adiol is mediated, at the molecular levels, by the estrogenic pathway.
  •  
    another awesome article dealing with hormone metabolites. Physicians that don't understand metabolites and receptors may be doing more harm than good.   One of the mainstays of the treatment of metastatic prostate disease is androgen deprivation therapy.  This article requires a reassessment of this due to the DHT metabolite 3-beta androstanediol.  This metabolite is produced from DHT production via the enzyme 3beta HSD.  This metabolite binds to ER beta, an estrogen receptor, and inhibits proliferation, migration, promotes adhesion (limits spreading), and stimulates apoptosis.  This is contrast to 3-alpha androstanediol.  Androgen deprivation therapy will decrease 3-beta androstanediol.  This is the likely reason for the increased aggressive prostate cancer found in those men using 5 alpha reductase inhibitors.
Nathan Goodyear

Circulating Inflammatory Cytokine Expression in Men With Prostate Cancer Undergoing Androgen Deprivation Therapy -- Maggio et al. 27 (6): 725 -- Journal of Andrology - 0 views

  •  
    this study found no increase in inflammatory cytokines in those men on androgen deprivation therapy for prostate cancer.  The question, is they evaluated testosterone in the serum, so did they really see a decrease in androgens or just a decrease in the transport of androgens.  Saliva would have detected a true androgen deficient state.
Nathan Goodyear

Effects of androgens on telomerase activity in normal and malignant prostate cells in vitro - Soda - 2000 - The Prostate - Wiley Online Library - 0 views

  •  
    Androgen deprivation therapy reduces Telomerase activity in androgen dependent prostate cancer cell lines.  Conversely, Testosterone increases Telomerase activity.  In these cell lines Telomerase activity is positively associated with prostate cancer.
Nathan Goodyear

Effectiveness of Primary Androgen-Deprivation Therapy for Clinically Localized Prostate Cancer - 0 views

  •  
    No benefit from Primary androgen deprivation therapy in localized prostate cancer.
Nathan Goodyear

Diabetes and Cardiovascular Disease During Androgen Deprivation Therapy: Observational Study of Veterans With Prostate Cancer - 0 views

  •  
    androgen deprivation therapy associated with increased type II diabetes, myocardial infarction and CAD.
Nathan Goodyear

Intermittent androgen deprivation therapy for pro... [Can J Urol. 2014] - PubMed - NCBI - 0 views

  •  
    Interesting concept on Androgen deprivation therapy.  ADT has significant negative metabolic effects in men.  Here Intermittent ADT is evaluated and found to be questionable in its outcome.
Nathan Goodyear

JAMA Network | JAMA | Long-term Follow-up of a Randomized Trial of Radiation With or Without Androgen Deprivation Therapy for Localized Prostate Cancer - 0 views

  •  
    Androgen deprivation therapy increases fatal heart attack risk in those with prostate cancer.  Also of note, the ADT therapy group did not provide a survival benefit over that of radiation alone.
Nathan Goodyear

Sleep deprivation induces brain region-specific decreases in... : NeuroReport - 0 views

  •  
    sleep deprivations leads to reduced glutathione production (in rat study) and increased oxidative stress in the brain.  
Nathan Goodyear

Association of androgen-deprivation therapy with excess cardiac-specific mortality in men with prostate cancer - Ziehr - 2014 - BJU International - Wiley Online Library - 0 views

  •  
    Androgen Deprivation Therapy, ADT,  is associated with increased cardiovascular mortality in men with pre-existing CVD.  This has also been shown to be the case with IR, Diabetes, weight gain...What man 40+ with prostate cancer doesn't have some degree of CVD??
Nathan Goodyear

Adverse Effects of Androgen Deprivation Therapy and... [Eur Urol. 2014] - PubMed - NCBI - 0 views

  •  
    Androgen deprivation Therapy is full of risks--of particular is cardiovascular disease, obesity, fatigue, diabetes, insulin resistance...
Nathan Goodyear

Androgen Deprivation Therapy and Future Alzheimer's Disease Risk - 0 views

  •  
    Androgen deprivation therapy appears to increase Alzheimer's disease risk.  In this study, the men on ADT the longest was found to be associated with increased diagnosis of Alzheimer's disease.
Nathan Goodyear

Androgen Deprivation Therapy and Future Alzheimer's Disease Risk - 0 views

  •  
    new risk potential for Androgen Deprivation Therapy (ADT) for men with prostate cancer--increased Alzheimer's disease risk.
Nathan Goodyear

Persistent Intraprostatic Androgen Concentrations after Medical Castration in Healthy Men: The Journal of Clinical Endocrinology & Metabolism: Vol 91, No 10 - 0 views

  •  
    Serum Testosterone levels and intra-prostatic Testosterone levels in men are very different in men with androgen deprivation therapy.  Though there is a 94% serum reduction, intra-prostatic Testosterone levels remain 20-30% higher.  
Nathan Goodyear

Intratumoral androgen biosynthesis in prostate cancer pathogenesis and response to therapy - 0 views

  • Additional studies have similarly found that prostate tissue levels of DHT in PCa patients treated with ADT therapy before prostatectomy declined by only ∼75% versus declines of ∼95% in serum levels
  • In a recent study in healthy men, treatment for 1 month with a GnRH antagonist to suppress testicular androgen synthesis caused a 94% decline in serum testosterone, but only a 70–80% decline in prostate tissue testosterone and DHT
  • progression to CRPC was associated with increased intratumoral accumulation or synthesis of testosterone.
  • ...9 more annotations...
  • the intraprostatic synthesis of testosterone from adrenal-derived precursors likely accounts for the relatively high testosterone levels in prostate after ADT
  • In addition, AR activity in these cells is likely further enhanced by multiple mechanisms that sensitize AR to low levels of androgens
  • higher affinity ligand DHT (approximately eightfold higher affinity
  • type 2 5α-reductase (SRD5A2) being the major enzyme in prostate
  • reduce DHT to 5α-androstane-3α,17β-diol (3α-androstanediol; Ji et al. 2003, Rizner et al. 2003), which is then glucuronidated to form 3α-androstanediol glucuronide by the enzymes UDP glycosyltransferase 2, B15 (UGT2B15) or UGT2B17
  • DHT in prostate is inactivated by the enzyme AKR1C2, which is also termed 3α-hydroxysteroid dehydrogenase type 3 (3α-HSD type 3
    • Nathan Goodyear
       
      The metabolite 3-alpha androstanediol is NOT inactive as this author states.  This DHT metabolite actually can stimulate  ER alpha receptors in the prostate.
  • AKR1C1, is also expressed in prostate. However, in contrast to AKR1C2, it converts DHT primarily to 5α-androstane-3β,17β-diol (3β-androstanediol; Steckelbroeck et al. 2004), which is a potential endogenous ligand for the estrogen receptor β
  • Significantly, intraprostatic testosterone levels were not substantially reduced relative to controls with normal serum androgen levels, although DHT levels were reduced to 18% of controls
  • testosterone levels in many of the CRPC samples were actually increased relative to control tissues (Montgomery et al. 2008). While DHT levels were less markedly increased, this may have reflected DHT catabolism
  •  
    This article discusses the failure of androgen deprivation therapy and prostate cancer.  This failure is quite common.  The authors point to alpha-DHT as the primary mechanism through AR stimulation.  However, we know that DHT metabolites also stimulate estrogen receptors.
Nathan Goodyear

Night work and inflammatory markers - 0 views

  •  
    Night shift work and sleep deprivation associated with increased inflammatory markers: IL-6, TNF-alpha, and CRP.
Nathan Goodyear

Changes in fat and lean body mass during androgen-de... [Urology. 2004] - PubMed - NCBI - 0 views

  •  
    Androgen deprivation therapy resulted in an 11% increase in fat mass and just under 4% decrease in lean muscle mass in men.  
1 - 20 of 61 Next › Last »
Showing 20 items per page