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The 4-Pregnene and 5α-Pregnane Progesterone Metabolites Formed in Nontumorous... - 0 views

  • We report here the first evidence that tumorous breast tissue exhibits elevated 5α-reductase activity, which promotes significant increases in 5α-pregnanes, especially 5αP,4 whereas the normal (nontumorous) breast tissue produces more 4-pregnenes, especially 3αHP
  • 3αHP and other 4-pregnenes inhibit, whereas 5αP and other 5α-pregnanes stimulate, breast cell proliferation and detachment
  • it is evident that breast tissue can convert progesterone into two classes of metabolites: the δ-4-pregnenes (which retain the C4–5 double bond), and the 5α-reduced 21-carbon steroids (5α-pregnanes)
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  • irreversible action of 5α-reductase
  • in normal (nontumorous) breast tissue, the 4-pregnene metabolites of progesterone greatly exceeded the 5α-pregnanes, whereas in tumorous tissue, 5α-pregnanes exceeded 4-pregnenes.
  • These differences in 5α-pregnane and 4-pregnene amounts were largely attributable to differences in 5αP and 3αHP production in tumorous and nontumorous tissues
  • the metabolic activities were in general similar, regardless of the age and ER state of the patient or whether she was pre- or postmenopausal.
  • These findings suggest greatly elevated 5α-reductase activity in tumorous, as compared with nontumorous, breast tissue.
  • progesterone metabolites that retain the C-4 double bond (i.e., the 4-pregnenes) exert an antiproliferative effect in the three cell lines that were tested, whereas the 5α-pregnanes stimulate breast cell line proliferation.
  • the degree of mitogenicity would be determined by the ratio of 5α-pregnanes:4-pregnenes. Tissues with a high 4-pregnene:5α-pregnane ratio would maintain a higher degree of normalcy, whereas those with a high 5α-pregnane:4-pregnene ratio would tend toward tumorigenicity
  • The observations that progesterone metabolites affect both ER-positive and ER-negative cells as well as tumorigenic (MCF-7) and nontumorigenic (MCF-10A) cells strengthen the argument that these factors may be endocrinologically relevant for all forms of breast cancer.
  • progesterone metabolites as the active endocrine/paracrine/autocrine factors
  • Estrogen-based therapies elicit responses in only one-third of all breast cancer patients, and most of these show relapse.
  • the metabolic activities were in general similar, regardless of the age and ER state of the patient or whether she was pre- or postmenopausal.
    • Nathan Goodyear
       
      Interesting that the effect of progesterone metabolites were found to be independent from ER status, age, and pre/post menopause
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    Different progesterone metabolites shown to have different tumor effects.  Implications are that, just as estrogen metabolism effects cancer risk, so does progesterone metabolism.
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Associations Between 25-Hydroxyvit... [J Womens Health (Larchmt). 2012] - PubMed - NCBI - 0 views

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    Those with higher vitamin D levels are associated with lower weight gain postmenopausal. Now, this could be due to increased outside exercise and activity.  However, due the NF-KappaB inhibition and resultant inflammation, it makes since that vitamin D reduces weight gain.  Plus it improves Insulin function and helps to control blood glucose.
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Vitamin D and breast cancer recurrence in the Women's Healthy Eating and Living (WHEL) ... - 0 views

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    Vitamin D shown to reduce breast cancer recurrence in premenopausal women.  Same association not found in postmenopausal women.
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JAMA Network | JAMA: The Journal of the American Medical Association | Low-Fat Dietary ... - 0 views

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    large study of 50,000 postmenopausal women found no significant reduction in CVD with a low fat diet.  The mean dietary time period was 8 years.
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Topical progesterone cream does not increase thrombotic and inflammatory factors in pos... - 0 views

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    Transdermal progesterone improves menopausal symptoms without an change in inflammatory markers.
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Lifelong Estrogen Exposure and Memory in Older Postmenopausal Women - Journal of Alzhei... - 0 views

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    Study finds suggestion of cognitive protection by enduring estrogen exposure.  Interesting, that estrogen seems to protect against cognitive decline in women, yet increases cognitive decline in men.
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Higher Serum Testosterone Concentration in Older Women is Associated with Insulin Resis... - 0 views

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    This study found that increasing Testosterone, as determined by serum, is associated with increased CVD, insulin resistance, and metabolic syndrome in postmenopausal women.  I believe that this massive Testosterone doping campaign that we are seeing in men and women is following the same patter seen with premarin and provera. 
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Efficacy and safety of testosterone in the managem... [J Sex Med. 2012] - PubMed - NCBI - 0 views

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    review of the literature finds that Testosterone therapy in women with low libido improves sexual activity without CVD and breast cancer risk in postmenopausal women.  Post menopause is a time associated with an increased risk of CVD in women.
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PLOS ONE: Vitamin D Supplementation and Breast Cancer Prevention: A Systematic Review a... - 0 views

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    Vitamin D supplementation finds no increased risk on breast cancer risk.  This is a negative study (meta-analysis) on vitamin D and breast cancer in postmenopausal women.  The strength of evidence lies with positive effects as numerous studies are documented in diigo here.
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Exogenous androgens influence body c... [J Clin Endocrinol Metab. 1996] - PubMed - NCBI - 0 views

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    Older study finds weak synthetic androgen improves weight loss in obese postmenopausal women.  This study compared nandrolone decanoate to spironolactone--an androgen receptor antagonist.  No change in glucose or insulin was seen.  Hard to draw a strong conclusion from this study due to the comparison of a synthetic androgen versus an anti-androgen.  This comparison could have exaggerated the benefit of androgen in these women.
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JAMA Network | JAMA | Menopausal Hormone Therapy and Health Outcomes During the Interve... - 0 views

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    This study cannot make the conclusion AT ALL.  They claim to say hormones should not be used to prevent chronic disease. Yet, the study they use to support this statement, the WHI, did not look at hormones.  The WHI looked at premarin and medroxyprogesterone acetate, a progestin.  They are not the hormones the body makes. Second, the WHI looked at women that were 6 years postmenopausal, on average, and then they added in bad drugs, disguised as hormone like, and then were dosed high.   If one desires to truly make a statement of prevention, one needs to pre-empt testing and therapy before disease.  Additionally, the study needs to match the hormones needed at the right physiologic level in the right balance.   One must also ensure proper hormone metabolism and know hormone receptor status.  This study does non of the above and the conclusion of this study is irrelevant.  In fact, I think the authors of this study have undergone scientific malpractice in their conclusions.
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Postmenopausal Women with a History of Irregular Menses and Elevated Androgen Measureme... - 0 views

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    Post menopause women with PCOS have high CVD.  PCOS is essentially metabolic syndrome separated by age.  Both PCOS and MetS in women is associated with an increase in Testosterone levels.
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Vascular Aging in Women: is Estrogen the Fountain of Youth? - 0 views

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    Estrogen improves vascular function in postmenopausal women.  The mechanism of action is through the increased nitric oxide production with estrogen therapy.  This increase in nitric oxide reduces endothelial dysfunction.
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Androgen Exposure Increases Human Monocyte Adhesion to Vascular Endothelium and Endothe... - 0 views

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    DHT shown to increase VCAM-1 adhesion to endothelial cells.  This was a cell culture study of human umbilical vein endothelial cells exposed to postmenopausal female serum and then DHT.  Not exactly physiologic.
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Estrogen Metabolism and Risk of Breast Cancer in Postmenopausal Women - 0 views

  • The ratio of the 2-hydroxylation pathway to parent estrogens was associated with a statistically significantly decreased risk of breast cancer
  • In this study, this ratio was more strongly associated with the risk of breast cancer compared with the ratio of 2-hydroxylation pathway to 16-hydroxylation pathway or unconjugated estradiol alone
  • 2-hydroxylation pathway catechols have relatively low affinities for estrogen receptors (4) and are rapidly cleared from circulation
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  • In this study, the ratio of the 2-hydroxylation pathway to the 16-hydroxylation pathway was associated with a non-statistically significantly decreased risk of breast cancer
  • In this study, the ratio of catechols to methylated catechols in the 4-hydroxylation pathway was associated with statistically significantly increased risk of breast cancer.
  • This result is consistent with the hypothesis that mutagenic quinones derived from 4-hydroxylation pathway catechols contribute to pathogenesis of postmenopausal breast cancer.
  • Catechols in both the 2- and 4-hydroxylation pathways can be oxidized to form quinones; these reactive electrophiles can then react with DNA to form a variety of adducts
  • Methylation of the catechols prevents their conversion to reactive quinones
  • the most common DNA adducts derived from 4-hydroxylation pathway catechols are depurinating and highly mutagenic (7,40), most of those derived from 2-hydroxylation pathway catechols are stable and can be repaired with little error
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    Lower 2-OH estrone metabolism associated with lower risk of breast cancer, but 4-OH estrone associated with increased risk of breast cancer.
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Cardiovascular Fat, Menopause, and Sex Hormones in Women: The SWAN Cardiovascular Fat A... - 1 views

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    declining serum Estradiol associated with increased cardiovascular fat in postmenopausal women.
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Salivary, but not serum or urinary levels of proge... [Clin Endocrinol (Oxf). 2000] - P... - 1 views

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    Salivary, but not serum or urinary levels of progesterone are elevated after topical application of progesterone cream to pre-and postmenopausal women.
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Bleeding patterns of the hormone replacement thera... [Obstet Gynecol. 2002] - PubMed r... - 0 views

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    Bleeding patterns of the hormone replacement therapies in the postmenopausal estrogen and progestin interventions trial.
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Salivary cortisol and dehydroepiandrosterone sulph... [Eur J Cancer Clin Oncol. 1983] -... - 0 views

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    Salivary cortisol and DHEA levels in postmenopausal women with primary breast cancer.
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Do urinary oestrogen metabolites predict breast ca... [Br J Cancer. 1998] - PubMed result - 0 views

  • post-menopausal (but not premenopausal) women at baseline who went on to develop breast cancer showed about a 15% lower 2:16alpha-OHE1 ratio than matched control subjects
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    can the pathway of estrogen metabolism help to predict postmenopausal breast cancer?  according to this study, yes.
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