Woman's Health Flashcards
(105 cards)
What is the HPO axis?
Hypothalamic-pituitary-ovarian (HPO) axis = maintains hormonal balance within the female reproductive system. Homeostasis needed.
How are LH (luteinizing hormone) and FSH (Follicle Stimulating Hormone) released (mechanism) and what do they do?
- GnRH (gonadotropin releasing hormone) stimulates the anterior pituitary to produce and release LH (luteinizing hormone) and FSH (Follicle Stimulating Hormone).
- LH and FSH support follicle development, ovulation, corpus luteum maintenance and the production of progesterone, oestrogen and inhibin (inhibit FSH) production. Body uses a negative feedback system to regulate hormones.
- Raised oestrogen and testosterone exert negative feedback over FSH and LH secretion.
What is pregnenolone? How is it synthesised and where?
All our reproductive hormone come from pregnenolone hormone.
Pregnenolone = a hormone synthesised from cholesterol in steroidogenic tissues such as the adrenal gland, gonads, and brain by the mitochondrial enzyme CYP11A1. Role of cholesterol not spoken about. Cholesterol is misunderstood.
Pregnenolone is *Anti-inflammatory and neuroprotective.
Pregnenolone is the precursor of which sex hormones?
- A precursor of DHEA (dehydroepiandrosterone), testosterone, DHT (dihydrotestosterone), oestradiol, progesterone and cortisol.
- DHT = dihydrotestosterone DHEA = dehydroepiandrosterone
What causes low levels of pregnenolone?
Advancing age (>30) and statin use
What are the signs and symptoms of low pregnenolone?
Poor memory; declining concentration and attention; fatigue; dry skin; joint and muscle pain; decreased libido
How to support pregnenolone production?
- Improves sleep, manages stress. Avocado, flax and chia seeds, olive oil, walnuts. B vitamins, vitamin K and D3.
- Improving sleep will impact the whole body. Physiological response to stress.
- For DHEA balance: Maca, rhodiola, magnolia; perilla oil, tribulus
what is the pregnenolone steal theory?
‘Pregnenolone steal theory’ = states that high stress increases the use of pregnenolone for cortisol production, reducing the total amount of pregnenolone available for production of sex hormones.
* However, there is no ‘giant pregnenolone pool’. Most is synthesised within the cell via its own pathway.
* Stress does have a major influence on sex hormones via downregulation of LH and FSH (e.g., ↓ ovulation).
Where is produced progesterone?
- Produced: In the corpus luteum (the yellow body from the follicle that converts after ovulation) after ovulation, in the adrenal cortex (small amounts) and by the placenta during pregnancy (large amounts).
What are the functions of progesterone?
o Maintains the endometrium for implantation and pregnancy. Increases cervical mucus (producing a barrier). Prepare the epithelial lining for the egg to implant during pregnancy.
o Progesterone metabolites potentiate the inhibitory actions of GABA by modulating receptors (increasing the receptor affinity to gaba); help relax smooth muscle. True calming neurotransmitter. If we can increase GABA we can relax muscles and calm anxiety. Does this by modulating the receptors through the metabolite allopregnanolone - Allopregnanolone is a naturally occurring neurosteroid which is made in the body from the hormone progesterone.
o Supports bone health and mammary development.
What cause progesterone imbalance?
- Progesterone imbalances: Perimenopause (going into menopause ovulation becomes erratic and start of menopausal symptom because difference in fluctuation in hormone), PCOS, infertility.
If you have low progesterone, you may have the symptoms of low oestrogen even if your oestrogen level is correct, the fact that progesterone is not is a tipping point and oestrogen:progesterone (O:P) ratio is not correct.
Other Causes of low progesterone?
Chronic stress, synthetic progesterones (don’t act like progesterone in the body – think OCP), xenoestrogens (chemicals that mimic oestrogen in the body).
Signs and symptoms of low progesterone?
- Signs and symptoms: Irritability, mood swings and insomnia.
Also = a higher risk of breast cancer in premenopausal women – because of the oestrogen dominance situation.
How to support progesterone production and oestrogen detox?
increase fibre, 3 balanced (not processed) meals / day, no snacking, avoid alcohol until balanced (in the presence of alcohol the liver is going to stop anything else that is does because alcohol is more of a toxic issue, incl. oestrogen metabolism), magnesium, vitamin C and B6, zinc. Vitex Agnus castus (chast tree – action via pituitary gland, increase progesterone production via an increase in LH boosting ovulation => Corpus Luteum and Progesterone production)
What are oestrogen? name the 3 types
Oestrogens = a group of steroid hormones, including oestrone (E1 – seen in post-menopausal woman), oestradiol (E2 – in menstruating female) and oestriol (E3 - pregnancy).
How is oestrogen produced?
By conversion of androgens via aromatase (aromatisation - a CYP450 enzyme responsible for the biosynthesis of oestrogens), e.g., in the ovaries, bone, breast, adipose tissue.
Describe oestrogen activity and the 3 types of oestrogen receptors ER alpha, ER beta and GPER
- Activity: Oestrogens exert their actions by binding to specific oestrogen receptors (ER): ERα (receptors located in the ovaries and the womb. Associated with female conditions SORM (selective Oestrogen Receptor Modulators medication like tamoxifen given post breast cancer, Erα are the preferable binding sites for those), Erβ (more widely spread in the body, also in brain, bladder and bones and products the modulating effect of the plants oestrogen like genistein found in soy beans, receptors for phytoeastrogen), and GPER (G-protein coupled estrogen receptor). Oestradiol (E2) ― most physiologically active during reproductive years.
What are the functions of oestrogen?
: Reproductive tract development, menstrual cycle, promotes cell proliferation (esp. breasts), glucose homeostasis, immune robustness; bone and cardiovascular health. Oestrogen is not just linked to female reproductive health and that is why we see an array of symptoms in menopause because we start loosing the oestrogen.
What is oestrogen dominance? what could be the 3 causes?
- Elevated oestrogen relative to progesterone. High O:P ratio despite normal oestrogen.
- Elevated specific types of oestrogen or metabolites due to poor detoxification and elimination. Liver function good? Phase 1 and 2 Detox good? Gut microbiome balanced? If not any excess oestrogen will lead to an overexpression of ERs
- Excess oestrogen induces an overexpression of ERα and ERβ.
What is oestrogen dominance associated with?
Associated with: Fibroids, endometriosis (tissue overexpression of oestrogen receptors), PMS, fibrocystic breasts, dysmenorrhea, infertility, miscarriages, perimenopause, breast / ovarian / endometrial cancers, insulin resistance, thyroid dysfunction (e.g., Hashimoto’s), brain fog, anxiety and depression (all hormones are interlinked).
oestrogen dominance aetiology/causes?
- Synthetic HRT and oral contraceptive pills — negative feedback and prevention of ovulation; synthetic progestin acts like testosterone and not progesterone so you push towards an oestrogen dominance.
- Xenoestrogens — e.g., in plastic, non-organic food, water supply.
- Heavy metals can bind to the oestrogens receptors sites triggering its action — e.g., lead, mercury, cadmium, aluminium. No pathways to deal with these heavy metals.
- Obesity lifestyle factor — ↑ aromatisation (in fat tissues) of testosterone to oestrogen. Increasing those levels.
- Poor liver detoxification and methylation.
- Constipation — oestrogen recirculates.
- Genetic mutations e.g., COMT (breaks down oestrogen) SNP – metalation pathway to breakdown and remove oestrogen.
- Intestinal dysbiosis (see later).
- Chronic stress (downregulates LH and FSH) – affecting fertility and foetus.
In Phase 1 oestrogen ‘biotransformation’ via CYP450 enzymes in which 3 metabolites can E1 be converted to? Which are the three pathways?
- 2-OH-E (broken down via the CYP1A1 pathway) — weakest, protective form. COMT de-activates 2-OHE1 to the protective 2-MeOE1 metabolite. We want to try and promote this pathway because it is the weakest form, protective. Deactivated via COMT to be eliminated.
- 4-OH-E (metabolised via the CYP1B1 pathway) — a pro-carcinogenic oestrogen metabolite neutralised by COMT into protective 4-MeOE1 metabolites. Overuse of this pathway is, therefore, problematic. If not broken down and deactivated can cause the DNA damaging quinones.
- 16α-OH-E (CYP3A4) — highest binding affinity for oestrogen receptors with high proliferative effects. It is protective (especially post menopause for bone health) but at the same time it has a high affinity for oestrogen receptors and is highly proliferative. We want to modulate this pathway.
High 16α-OH-E is associated with a higher risk of oestrogen dependent conditions, e.g., breast cancer, fibroids, endometriosis.
describe the phase 2 oestrogen metabolism — via sulphation, methylation or glucuronidation for 2-OH-E, 4-OH-E and 16alpha-OH-E:
- 2-OH-E and 4-OH-E undergo methylation via COMT to become less reactive metabolites which can be excreted in urine or bile.
o 4-OH-E and 16α-OH-E levels may elevate if methylation is compromised (e.g., due to lack of key nutrients or a COMT SNP).
o Poor methylation ↑ conversion of 4-OH-E to quinones which can cause oxidative damage to DNA, increasing cancer risk. - 16α-OH-E metabolises to E3 which then undergoes sulphation. 2-OH-E and 4-OH-E also undergo sulphation and glucuronidation
How to Supporting phase I oestrogen metabolism:
- Include: modulate CYP3A4, Support CYP1A1 and block CYP1B1:
I3C, cruciferous vegetables, antioxidants, glutathione (also neutralises reactive quinone species), turmeric, resveratrol, berries, rooibos tea and celery. Support a healthy microbiome. - Avoid: CYP450 inducers a it accelerate the pathway especially the CYP1B1 pathway: Paracetamol, PCBs, smoking, grapefruit.