Skip to main content

Home/ Dr. Goodyear/ Group items tagged articles

Rss Feed Group items tagged

Nathan Goodyear

Free Testosterone Measurement by the Analog Displacement Direct Assay: Old Concerns and... - 0 views

  •  
    the standard technique of "free testosterone" calculation today is via equilibrium dialysis.  This article describes the problem with current evaluation techniques of current free testosterone evaluation: "this method, although sensitive and reproducible, is cumbersome and not easily adaptable to automated methods".  Most values of "free testosterone" today are either calculated or estimated as this article points out.  Why not just measure with saliva?!
Nathan Goodyear

Androgens in Polycystic Ovary Syndrome: The Role of Exercise and Diet - 0 views

  •  
    Though this article looked at diet and exercise on PCOS, this article gives a great review of the pathophysiology of PCOS. This study did show that diet and exercise were effective in lowering androgens and improving insulin resistance.
Nathan Goodyear

Estrogen receptor β and the progression of prostate cancer: role of 5α-andros... - 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

http://69.164.208.4/files/Anti-inflammatory%20Properties%20of%20Curcumin,%20a%20Major%2... - 0 views

  •  
    another review of the science on curcumin in treatment of disease.  Pay careful attention to the pharmacokinetics portion of this article.  Notice this is an "alternative Medicine" article, yet it is all science.  The use of the word alternative is simply fear mongering.
Nathan Goodyear

S-Adenosylmethioninein alcoholic liver cirrhosis: a randomized,placebo-contr... - 0 views

  •  
    full pdf article of previously posted article on SAMe and how it increases CBS activity to increase GSH and thus reduce liver oxidative stress and fat accumulation. SAMe also decreases IL-10 and TNF-alpha.
Nathan Goodyear

Diagnosis of secondary adrenal insufficiency in patients with hypothalamic-pituitary di... - 0 views

  •  
    European journal of endocrinology article compared serum to salivary cortisol and found them to be equal, but due to ease of collection, salivary cortisol to be preferable.  This article was using cortisol to assess HPA axis dysfunction.
Nathan Goodyear

Changes in Gut Microbiota Control Metabolic Endotoxemia-Induced Inflammation in High-Fa... - 0 views

  •  
    2008 article from diabetes.  This article supports metabolic endotoxemia arising out of the gut.  High fat diet intake results in disrupted gut flora, resulting in increrased LPS release, resulting in inflammation, leads to leaky gut, systemic endotoxemia, inflammation, and thus metabolic dysfunction: see obesity, DM..
Nathan Goodyear

The Decline of Androgen Levels in Elderly Men and Its Clinical and Therapeutic Implicat... - 0 views

  •  
    discussion of the declining levels of androgens in the aging male.  But the focus of this entire article is wrong.  They are focusing on the blood levels of these androgens.  The biological effects of hormones occur in tissue not blood.  Though this article provides a good discussion of how transport of androgens are effected, it falls far short of providing any useful clinical application, because it fails to discuss peripheral levels of androgens.  
Nathan Goodyear

The Dark Side of Testosterone Deficiency: III. Cardiovascular Disease - Traish - 2013 -... - 0 views

  •  
    More recent articles have been published, but this review article reviews the link between low T and cardiovascular disease in men.
Nathan Goodyear

Testosterone replacement in prostate cancer survivors with hypogonadal symptoms - Leibo... - 0 views

  •  
    Good article.  This article (case series) found that 40% of the men included had no increase in PSA with Testosterone.  One point on the Testosterone dosage is that they used androgen, which is an overdose of Testosterone.  That gives 60% that the PSA did increase.  These men had higher PSA to begin with which leads to the suggestion that the prostate cells were abnormal.  Those men that had a prostatectomy were more likely to have little if any increase in PSA.  This study did use a the 5 alpha reductase inhibitor dutasteride.
Nathan Goodyear

Estrogen Metabolism and Risk of Breast Cancer in Postmenopausal Women - 0 views

  •  
    Get article on estrogen metabolism/metabolites and their effects on the risk of breast cancer in post menopause women.  This article brings to light new information: 2:16alpha estrone ratio is not a great predicted of risk, 2-OH and 4-OH metabolites can form quinone intermediates...
Nathan Goodyear

Reduced testosterone levels indicate need to trea... [Nurs Stand. 2014] - PubMed - NCBI - 0 views

  •  
    I can only find the abstract of this article.  This article fits with the growing body of evidence that low Testosterone is a poor prognostic factor for men with prostate cancer.  This very short abstract points to using low levels of "free Testosterone" as a biomarker to treat low-risk prostate cancer.
Nathan Goodyear

Gut Microbiota in Health and Disease | Physiological Reviews - 0 views

  •  
    Must read and a great read at that, of the GI's contribution to health or disease.  The article reviews the current understanding of the GALT layer and it's contribution to health or metabolic endotoxemia and how this then leads to disease. The article reviews the effects of disrupted GI bacteria in the gut as well as in other organ systems.
Nathan Goodyear

Fifty-two-week treatment with diet and exercise plus transdermal te... - PubMed - NCBI - 0 views

  •  
    This article finds that Testosterone transdermal therapy addition to Diet and exercise improved glycemic control and reversed Metabolic Syndrome in men with low T and type II Diabetes.  This article really highlights the proper approach to therapy: combined nutrition, exercise, and Testosterone therapy, when indicated, for men with Metabolic Syndrome and/or Diabetes.  A reduction in IR, adiponectin and hsCRP was observed.
Nathan Goodyear

Differential Effects of Dehydroepiandrosterone and Testosterone in Prostate and Colon C... - 0 views

  • Several studies indicate that DHEA may enhance cancer-promoting activities in several prostate cancer cell lines acting as agonist or antagonist for the intracellular AR
  • the estrogenic metabolites of DHEA, 5a-androstane-3b, 17b-diol (3b-Adiol) and E2 bind to estrogen receptors but not to AR
  • no specific receptor has been identified for DHEA
  • ...16 more annotations...
  • Different members of neurotrophins are expressed during cancer progression, suggesting their involvement in cell proliferation, anoikis protection, and malignancy
  • Regulation of the apoptotic machinery in prostate and colon cancer cells by testosterone occurs rapidly and is initiated at the plasma membrane level through specific membrane-binding sites not involving the classical cytoplasmic AR
  • testosterone exerts potent regulatory effects on prostate and colon cancer cell apoptosis
  • Testosterone increased cell death in a dose-dependent manner
  • testosterone antagonizes the prosurvival effects of DHEA in neuronal cells, blocking its binding to NGF receptors
  • treatment of cells with DHEA exerted a strong antiapoptotic effect,
  • Androgens hold a central role in prostate and colon cancer biology
  • elevated levels of DHEA or its sulfate ester DHEA-sulfate in young adults are associated to low incidence of androgen-dependent tumors
  • DHEA may play a protective role in young prostate
  • The decline of DHEA with aging may contribute to prostate cancer progression associated with advanced age
  • DHEA is an effective antiapoptotic factor, reversing the serum deprivation-induced apoptosis in prostate cancer cells (DU145 and LNCaP cell lines) as well as in colon cancer cells
  • NGF appears to exert similar antiapoptotic actions in both prostate and color cancer cells
  • exposure of prostate DU145 and colon Caco2 cancer cells to testosterone totally blocked the protective effects of both DHEA and NGF. These findings suggest that testosterone acts as an antagonist of DHEA and NGF
  • These findings support the hypothesis that testosterone may inhibit cancer cell growth by antagonizing the proliferative, antiapoptotic effects of endogenous factors, such as DHEA or NGF, in the case of prostate and colon cancer cells
  • intratumor hormonal microenvironment may play a critical role in tumor progression.
  • The paracrine interactions of androgens with locally produced NGF may define tumor cell fate
  •  
    Full article of previously posted abstract.  Cancers are unique.  Not all cancers are alike.  Whether they are tissue specific or not, cancers are unique.  This article describes the uniqueness of DHEA and Testosterone cancer, with particular attention to colon.
Nathan Goodyear

Longitudinal Effects of Aging on Serum Total and Free Testosterone Levels in Healthy Me... - 0 views

  • NUMEROUS CROSS-SECTIONAL INVESTIGATIONS have demonstrated lower concentrations of circulating testosterone (T) and/or free T in older men
  • Two small-scale longitudinal investigations have observed decreases, with aging, in total T
  • T levels decline at a more or less constant rate, with age, in men, with no period of accelerated decline
  • ...15 more annotations...
  • aging in men is associated with decreases in bone mineral density (BMD) (18, 19), lean body and muscle mass
  • strength (22, 23) and aerobic capacity (24), as well as with increases in total and abdominal body fat, low-density lipoprotein cholesterol, and/or low-density lipoprotein/high-density lipoprotein cholesterol ratios (25, 26, 27, 28), all of which also occur in nonelderly hypogonadal men
  • Most (1, 5, 6, 7, 8, 9), but not all (10, 11, 12), cross-sectional studies have demonstrated a decrease, with age, in total T in men
    • Nathan Goodyear
       
      FAI: 100 x total Testosterone nmol/L/SHBG nmol/L
    • Nathan Goodyear
       
      These numbers do point to an increase in ng/dl decline in Total Testosterone with increasing age (decade group)
  • total T, but not free T index, tended to decrease with greater BMI is consistent with prior studies showing that obesity is associated with decreases in both SHBG and total T, with an unchanged T-to-SHBG ratio
  • The conventional definition for T levels is statistical (values more than 2 sd below the mean), rather than functional. Such a definition does not reflect clinical realities, such as the existence of characteristic individual set points for circulating hormone levels, below which one, but not another, individual may develop metabolic changes of hormone deficiency; nor does it address the concept of reserve capacity, the possibility that persons with hormone levels 2 sd below the population mean still may have adequate hormone concentrations to meet their metabolic needs.
    • Nathan Goodyear
       
      good explanation of problems with just using a number to define low T
  • both T and free T index (a calculated value related to free or bioavailable T) decreased progressively at a rate that did not vary significantly with age, from the third to the ninth decades.
  • contrasts with other studies showing diminished free, as well as total, T in with increasing total (48) or abdominal (49) obesity in men.
  • Our analysis of date-adjusted T and free T index levels, by decade, showed that relatively high numbers of older men in this generally healthy population had at least one hypogonadal value (defined as below the 2.5th percentile for young men)
  • The issue of how properly to define hypogonadism, or indeed any hormone deficiency, remains problematic
  • The decrease in free T index was somewhat steeper than that of total T, owing to a trend for an increase in SHBG with age
  • LH for gonadal function
  • It would clearly be better to define the lower limit of normal for a hormone as: the blood level at which metabolic and/or clinical sequelae of hormone deficiency begin to appear, or the level below which definite benefits can be demonstrated for hormone supplementation for a significant proportion of the population
  • an effect of aging to lower both total and bioavailable circulating T levels at a relatively constant rate, independent of obesity, illness, medications, cigarette smoking, or alcohol intake
  •  
    Article highlights the problems with the definition of low T.  This article finds consistent decline in Total Testosterone and FAI with increasing age groups, with a significant portion of men > 60 meeting the required levels for "low T".  This study found a decrease in total T and FAI at a consistent rate independent of variables, such as BMI.    This study did find a decrease in SHBG and total T with obesity; in contrast to other studies.
Nathan Goodyear

Inborn-like errors of metabolism are determinants of breast cancer risk, clinical respo... - 0 views

  • We now recognize that human cancers evolve in an environment of metabolic stress. Rapidly proliferating tumor cells deprived of adequate oxygen, nutrients, hormones and growth factors up-regulate pathways that address these deficiencies to overcome hypoxia (HIF), vascular insufficiency (VEGF), growth factor deprivation (EGFR, HER2) and the loss of hormonal support (ER, PR, AR) all to enhance survival and proliferation
  • RAS, PI3K, TP53 and MYC
  • The results suggest that breast cancer could be preceded by systemic subclinical disturbances in glucose-insulin homeostasis characterized by mild, likely asymptomatic, IEM-like biochemical changes
  • ...16 more annotations...
  • The process would include variable periods of hyperinsulinemia with the consequent systemic MYC activation of glycolysis, glutaminolysis, structural lipidogenesis and further exacerbation of hypoglycemia, the result of MYC's known role as an inhibitor of liver gluconeogenesis
  • The metabolic changes we describe in breast cancer arise in concert with IEM-like changes in oxidative phosphorylation as detected by increased values of the ratio lactate/pyruvate (Supplementary Table 2A, 2B) characteristic of Ox/Phos deficiency [25]. In our study, 76% (70/92) of the European breast cancer patients had lactate/pyruvate ratios values higher than the normal value of 25.8
  • four-fold higher frequency of cancer (including breast) in patients with energy metabolism disorders
  • growing recognition that cancer cells differ from their normal counterparts in their use of nutrients, synthesis of biomolecules and generation of energy
  • glutamine concentrations in the cancer patients were reduced to nearly 1/8 of the levels observed in the normal population
  • blood concentrations of aspartate (p = 1.7e-67, FDR = 8.3e-67) (Figure ​(Figure1E)1E) and glutamate (p = 6.4e-96, FDR = 6.2e-95) (Figure ​(Figure1F)1F) were nearly 10 fold higher than the normal ranges of 0–5 μM/L and 40 μM/L, respectively
  • glutamine consumption associated with parallel increases in glutamate and aspartate (Figure ​(Figure1A1A red arrows) is considered a hallmark of MYC-driven “glutaminolysis”
  • Gln/Glu ratio inversely correlates with i- late stage metabolic syndrome and with ii- increased chance of death
  • changes in glutamine consumption, reflected by the Gln/Glu ratio could provide a metabolic link between breast cancer initiation and diabetes, reflective of a systemic metabolic reprogramming from glucose to glutamine as the preferred source of precursors for biosynthetic reactions and cellular energy
  • lower Gln/Glu ratios inversely correlated with insulin resistance and the risk of diabetes
  • the metabolic dependencies of cancer characterized by excessive glycolysis, glutaminolysis and malignant lipidogenesis, previously considered a consequence of local tumor DNA aberration [23] could, instead, represent a systemic biochemical aberration that predates and very likely promotes tumorigenesis
  • these metabolic disturbances would be expected to remain extant after therapeutic interventions
  • accumulation of very long chain acylcarnitines such as C14:1-OH (p = 0.0, FDR = 0.0), C16 (p = 0.0, FDR = 0.0), C18 (p = 0.0, FDR = 0.0) and C18:1 (p = 1.73e-322, FDR = 1.16-321) and lipids containing VLCFA (lysoPC a C28:0) (p = 1.14-e95, FDR = 1.65e-95) in the blood of breast and colon cancer patients
  • Among the most powerful metabolic equations for MYC-activation is that which links the widely used MYC-driven desaturation marker ratio of SFA/MUFA to the MYC glutaminolysis-associated ratio of (Asp/Gln)
  • liver dysfunction shares many features with both IEM and cancer suggesting a role for hepatic dysfunction in carcinogenesis
  • cancer “conscripts” the human genome to meet its needs under conditions of systemic metabolic stress
  •  
    Breast cancer is a metabolic disease.  Now, where have I heard that cancer is a metabolic disease?
Nathan Goodyear

Ivermectin: enigmatic multifaceted 'wonder' drug continues to surprise and exceed expec... - 0 views

  • The avermectins are known to possess pronounced antitumor activity
  • Over the past few years, there have been steadily increasing reports that ivermectin may have varying uses as an anti-cancer agent, as it has been shown to exhibit both anti-cancer and anti-cancer stem cell properties
  • In human ovarian cancer and NF2 tumor cell lines, high-dose ivermectin inactivates protein kinase PAK1 and blocks PAK1-dependent growth
  • ...13 more annotations...
  • PAK1 is essential for the growth of more than 70% of all human cancers, including breast, prostate, pancreatic, colon, gastric, lung, cervical and thyroid cancers, as well as hepatoma, glioma, melanoma, multiple myeloma and for neurofibromatosis tumors
  • Ivermectin suppresses breast cancer by activating cytostatic autophagy, disrupting cellular signaling in the process, probably by reducing PAK1 expression
  • Cancer stem cells are a key factor in cancer cells developing resistance to chemotherapies and these results indicate that a combination of chemotherapy agents plus ivermectin could potentially target and kill cancer stem cells, a paramount goal in overcoming cancer
  • Triple-negative breast cancers, which lack estrogen, progesterone and HER2 receptors, account for 10–20% of breast cancers and are associated with poor prognosis
  • Ivermectin addition led to transcriptional modulation of genes associated with epithelial–mesenchymal transition and maintenance of a cancer stem cell phenotype in triple-negative breast cancers cells, resulting in impairment of clonogenic self-renewal in vitro and inhibition of tumor growth and metastasis in vivo
  • Ivermectin-induced cytostatic autophagy also leads to suppression of tumor growth in breast cancer xenografts, causing researchers to believe there is scope for using ivermectin to inhibit breast cancer cell proliferation and that the drug is a potential treatment for breast cancer
  • ivermectin synergizes with the chemotherapy agents cytarabine and daunorubicin to induce cell death in leukemia cells
  • Ivermectin inhibits proliferation and increases apoptosis of various human cancers
  • Activation of WNT-TCF signaling is implicated in multiple diseases, including cancers of the lungs and intestine,
  • A new screening system has found that ivermectin inhibits the expression of WNT-TCF targets
  • It represses the levels of C-terminal β-catenin phosphoforms and of cyclin D1 in an okadaic acid-sensitive manner, indicating its action involves protein phosphatases
  • In vivo, ivermectin selectively inhibits TCF-dependent, but not TCF-independent, xenograft growth without side effects
  • ivermectin has an exemplary safety record, it could swiftly become a useful tool as a WNT-TCF pathway response blocker to treat WNT-TCF-dependent diseases, encompassing multiple cancers.117
  •  
    Ivermectin shows promise and usefullness in several cancer types.  This is a review article.
Nathan Goodyear

The role of glucocorticoids and progestins in inflammatory, autoimmune, and infectious ... - 0 views

  •  
    very nice of how glucocorticoids and progesterone interact with the immune system.   This review article discusses the current understanding of  how hormones can contribute to autoimmune disease states through inflammation.
Nathan Goodyear

Counteracting muscle wasting in HIV-infected individuals - 0 views

  •  
    HIV/AIDS patients are plagues with muscle loss through varying mechanism. This article discusses the various contributors to the muscle mass found in these men. However, this can be applicable to other men with chronic muscle loss, low T, HGH deficiency...
‹ Previous 21 - 40 of 4570 Next › Last »
Showing 20 items per page