Skip to main content

Home/ Dr. Goodyear/ Group items tagged sex hormones

Rss Feed Group items tagged

Nathan Goodyear

Neuroprotection of Sex Steroids - 0 views

  •  
    great article on sex hormones and neuroprotection.  This article summarizes the research on estrogen, progesterone, and aromatase activity in in vitro and in vivo studies.  Additionally, the study reviews the androgenic neuroprotection in men.  Who has said that hormones are not needed post menopausal again?  Maybe, that is the sign that they need the neuroprotective effect of hormones.
Nathan Goodyear

http://www.europeanurology.com/article/S0302-2838(08)01435-8/pdf/Oestrogens+and+Prostat... - 0 views

  •  
    Nice review of the proposed complex interaction between hormones and prostate cancer.  The complex nature of the development of cancer will likely eliminate the complete elucidation of the mechanism of prostate cancer.  However, there are many pieces that would favor: increased aromatase activity appears to play a significant role int he development of prostate cancer, clearly intraprostatic hormones are different than serum making serum evaluation of sex hormones irrelevant--the move should be to salivary hormones, and the growing knowledge of DHT metabolites in the protection of prostate cancer--3 beta androstanediol.
Nathan Goodyear

Salivary Sex Hormone Measurement in a National, Population-Based Study of Older Adults - 0 views

  •  
    Another study supports saliva hormone testing.  This study involved 2,722 individuals and tested estradiol, progesterone, DHEA and testosterone in men and women.  All of these are sex hormones.  Someone needs to tell the insurance companies that the overwhelming evidence supports saliva hormone testing.  But, that would mean they are even interested in the science.
Nathan Goodyear

Sexual function and hormone profile in young adult men with idiopathic gynecomastia: Co... - 0 views

  •  
    somewhat flawed study in that they looked at serum sex hormones to evaluate men with gynecomastia compared to controls.  A better eval would have been of saliva or blood spot.  Free levels will show more subtle changes physiologically than will serum as to the sex hormones.  The study did find decreased sexual function in the men with gynecomastia--indicating hormone issues not picked up by the serum.
Nathan Goodyear

The permeability of the human red cell ... [Biochim Biophys Acta. 1994] - PubMed - NCBI - 0 views

  •  
    sex hormones readily carried on human red blood cells.  Reason transdermal progesterone is picked up in saliva and not serum.  Sex hormones are lipophillic and blood is water soluble.
Nathan Goodyear

Endogenous Sex Hormones and Prostate Cancer: A Collaborative Analysis of 18 Prospective... - 0 views

  •  
    a large collaborative analysis finds no association between ANY sex hormones and prostate cancer.  
Nathan Goodyear

Sex hormones in head and neck cancer: Current knowledge and perspectives Singh HP, Kuma... - 0 views

  •  
    Sex hormones in head and neck cancer.  The jury is still out and probably follows other hormone sensitive cancers.  
Nathan Goodyear

Gender and sex hormones in multiple sclerosis pathology and therapy - 0 views

  • It is now well recognized that the disease manifestation is reduced in pregnant women with relapsing-remitting MS
  • This occurs particularly during the third trimester when levels of estrogens (estradiol and estriol) and progesterone (see Table 2) are elevated up to about 20 times
  • This seems well correlated with a decrease in active white matter lesions detected by MRI
  • ...12 more annotations...
  • This clinical improvement is however followed by temporary rebound exacerbations at post-partum, when the hormone levels decline
  • a shift from Th1 to Th2 immune response, expansion of suppressive regulatory T lymphocytes and decrease in the number of circulating CD16+ natural killer (NK)-cells
  • Th1 lymphocytes secrete proinflammatory cytokines (e.g. IL-2, IFNgamma, lymphotoxin) while Th2 cells secrete anti-inflammatory cytokines (e.g. IL-4, IL-5, IL-10), which favor humoral-mediated responses
  • Th2 cytokines are associated with down-regulation of Th1 cytokines and this Th2 shift is believed to provide protection from allograft rejection during pregnancy as well as from Th1-mediated autoimmune disease
  • it is worth noting that the levels of other hormones with anti-inflammatory activity (1,25-dihydroxy-vitamin D3, norepinephrine, cortisol) also increase by 2 to 4 times during late pregnancy
  • 1,25-dihydroxy vitamin D3 induces regulatory T-cell function important for development of self-tolerance
  • breast-feeding does not alter the relapse rate in women with MS
  • Leptin is a pleiotropic hormone produced primarily by adipocytes but also by T lymphocytes and neurons
  • Several lines of evidence indicate that leptin contributes to EAE/MS pathogenesis, influencing its onset and clinical severity, by acting as a proinflammatory cytokine which promotes regulatory T cell (Treg) anergy and hyporesponsiveness, resulting in increased Th1 (TNFalpha, INFgamma) and reduced Th2 (IL-4) cytokine production
  • circulating leptin levels are increased in relapsing-remitting MS patients (men and women analyzed together) while the CD4+CD25+Treg population decreases
  • As the leptin plasma concentrations are proportional to the amount of fat tissue, obese/overweight individuals produce higher levels of leptin
  • Nielsen et al found that estradiol and progesterone exert neuroprotection against glutamate neurotoxicity, while MPA antagonizes the neuroprotective effect of estradiol and exacerbated neuron death induced by glutamate excitotoxicity
  •  
    very good review of the differences in MS and hormones between the sexes.
Nathan Goodyear

Rapid determination of natural steroidal hormones in saliva for the clinical diagnoses - 0 views

  •  
    This study looked at combined sex hormone analysis via gas chromatography-mass spec.  Levels were able to be detected as low as 0.002 mcro/L in saliva.  This study validates the GC-MS for the use of multiple, simultaneous steroid hormone analysis
Nathan Goodyear

Bentham Science Publishers - 0 views

  • Gonadal, adrenal and neurosteroids
  •  
    hormones are the link between the brain and sex for men?  Yes, but a little more complex than that: interaction between the immune system (inflammation) and the endocrine system (hormones).
Nathan Goodyear

[Changes of sex hormo... [Zhongguo Ying Yong Sheng Li Xue Za Zhi. 2013] - PubMed - NCBI - 0 views

  •  
    study looked at post hormonal effects on atherosclerosis after castration for prostate cancer.  They found significant decrease in sex hormones, significant increase in the E2:T ratio and an increase in atherosclerosis.
Nathan Goodyear

Sex Steroid Hormone Levels and Body Composition in Men - 0 views

  •  
    The results of this study: body composition i.e. fat, effects hormone levels, rather then hormone effecting body composition.  
Nathan Goodyear

Redefining Metabolic Syndrome in Men (July 2012) Townsend Letter for Doctors & Patients - 0 views

  • Approximately 95% to 98% of testosterone is bound to a carrier protein at any given time, leaving just the remaining 2% to 5% as completely unbound and available for tissues to use
  • most serum laboratories offer a free testosterone level, which is a calculated value based on SHBG levels or determined with equilibrium dialysis
  • the hormone enters the salivary gland by passive diffusion
  • ...11 more annotations...
  • Testosterone has a known age-related decline, and total levels typically drop by approximately 1.6% per year beginning for most men in their 30s
  • As estrogen levels rise, they prompt the body to produce more SHBG, which in turn has a higher binding affinity for testosterone, and drives the unbound fraction of the testosterone pool down even further
  • When the increase in SHBG is taken into account, the age-related decline in the level of hormone that can be used by the body is closer to 2% to 3% per year.
  • Stinging nettle (Urtica dioica), an herb commonly used for allergies, can also be employed to bind to SHBG, which leaves more testosterone available to tissues
  • Leptin, an adipose-derived peptide hormone that regulates appetite and metabolism, has been shown to directly inhibit testosterone production in animal models
  • tumor necrosis factor alpha (TNF-alpha) and interleukin-1 (IL-1) further inhibit Leydig cell testosterone production
  • Natural aromatase inhibitors include the bioflavonoids chrysin and luteolin
  • Zinc deficiency causes an upregulation of the aromatase enzyme
  • Testosterone reduces lipoprotein lipase (LPL) activity
  • there are several herbs that can work to boost testosterone levels, including longjack (Eurycoma longifolia), horny goat weed (Epimedium grandiflorum), and tribulus (Tribulus terrestris).
  • the majority of the hormone is bound to carrier proteins including sex hormone binding globulin (SHBG) and albumin
  •  
    nice and short review on testosterone and men's  health.
Nathan Goodyear

JAMA Network | JAMA Dermatology | Sex Hormones and the Genesis of Autoimmunity - 0 views

  •  
    Hormones and autoimmune disease.  This article specifically touches on SLE.  Good discussion on the biochemical signaling of hormones and their contribution to the increased autoimmunity found in women.
Nathan Goodyear

http://onlinelibrary.wiley.com/store/10.1002/art.11105/asset/11105_ftp.pdf;jsessionid=4... - 0 views

  •  
    good review of sex hormones and LUPUS; whether it is causative or not, sex hormones trends exist in LUPUS i.e. low DHEA in both sexes, low progesterone in women, and low Testosterone in women>men.
Nathan Goodyear

Sex steroids and cardiovascular disease Yeap BB - Asian J Androl - 0 views

  • Levels of SHBG are higher in older men, therefore levels of free T decline more steeply than total T as men's age increases.
  • calculations based on mass action equations may not reflect precisely free T measured using a reference method
  • free T declines more steeply with age than total T in both cross-sectional [35] and longitudinal studies, [36] as does free E2 in comparison to total E2
  • ...22 more annotations...
  • T may slow development of or progression of atherosclerosis by modulating effects on insulin resistance, inflammation, endothelial function, preclinical atherosclerosis or the vasculature.
  • these cross-sectional and longitudinal studies support a relationship between low circulating T with CIMT and higher E2 with its progression
  • lower levels of T are biomarkers for aortic vascular disease
  • circulating free T was negatively associated with the presence of AAA
  • luteinizing hormone (LH) was positively associated.
  • low levels of total or bioavailable T were associated with aortic atherosclerosis manifested as calcified deposits detected by radiography
  • Men with total or free T in the lowest quartile had increased adjusted ORs for PAD defined as ABI <0.90, as did men with free E2 in the highest quartile of values
  • The apparent association of SHBG with intermittent claudication reflects the correlation of total T with SHBG, while the contribution of E2 to risk of PAD remains unclear
  • men with total T in the lowest quartile of values (<11.7 nmol l−1 ) experienced an increased incidence of stroke or transient ischemic attack
  • lower total T with increased incidence of CVD events
  • cohort studies in mostly older men have supported the association of lower androgen levels with higher mortality
  • lower total or free T levels were associated with mortality in older men, but with discordant results for cause-specific mortality and for associations of E2
  • several large studies identifying lower endogenous levels of total or free T as independent predictors of all-cause or CVD-related deaths in middle-aged and older men
  • T exhibits anti-inflammatory effects, enhances flow-mediated brachial artery reactivity, and reduces arterial stiffness
  • Short-term T therapy had a beneficial effect on exercise-induced myocardial ischemia in middle-aged men with coronary artery disease or chronic stable angina, [95],[96],[97] and reduced angina frequency in older men with diabetes and coronary artery disease
  • T therapy resulted in an increase in treadmill test duration and time to ST segment depression
  • there are interventional studies supporting a protective effect of exogenous T against myocardial ischemia in men with coronary artery disease
  • employ conservative doses
    • Nathan Goodyear
       
      This dosing is 100 fold higher then peak production of a  young man at 20-22.
  • Observational studies indicate that lower levels of endogenous T in older men are associated with the presence of carotid atherosclerosis, aortic and peripheral vascular disease, and incidence of CVD events and mortality
  • Interventional studies have shown beneficial effects of exogenous T on vascular function and on exercise-induced myocardial ischemia in men with coronary artery disease
    • Nathan Goodyear
       
      the therapies employed in these studies were massively overdosed.
  •  
    Nice review of all the sex hormones and their relationship to CVD in men.  
Nathan Goodyear

Sex hormones and systemic lupus eryt... [Rheum Dis Clin North Am. 2000] - PubMed - NCBI - 0 views

  •  
    older study and only the abstract.  However, sex hormones play role in inflammation and autoimmune disease.
Nathan Goodyear

Steroid Analysis in Saliva: An overview - 0 views

  •  
    No test is perfect. This study analyzes problems with saliva hormone testing.  The authors of this study found saliva testing optimal for cortisol and less so for sex hormones.  Other studies have contradicted this conclusion.
Nathan Goodyear

Adrenal and gonadal steroid hormone deficiency in the pathogenesis of rheumatoid arthri... - 0 views

  •  
    Only abstract available here.  Low adrenal hormone output and low sex hormone production associated with increase RA.  Causation not proved here.
Nathan Goodyear

Hormonal alterations in rheumatoid arthritis, including the effects of pregnancy. - Pub... - 0 views

  •  
    low adrenal hormone output and sex hormone output associated with RA; low adrenal output may pose a more direct effect.  This is likely why pregnancy is associated with a decrease with RA and the postpartum is associated with an increase.
1 - 20 of 243 Next › Last »
Showing 20 items per page