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Adrenal & Gonadal Hormones Layers of Adrenal Cortex

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Adrenal & Gonadal Hormones Layers of Adrenal Cortex Adrenal & Gonadal Hormones Topics for today: •Adrenal cortex hormone •Adrenal medulla hormones •Hormone control of organs •Steroid hormone synthesis •Vitamin D3 • Estrogens and Progesterone Layers of adrenal cortex zona glomerulosa zona fasiculata zona reticularis 1 Hormones of adrenal cortex zona glomerulosa zona fasiculata O zona reticularis HO dehydroepiandrosterone Androgens – dehydroepiandrosterone • increased protein synthesis DHEA is weak androgen with • masculinizing effects in almost no effect in male but has female (hypersecretion) masculinizing effects in females Adrenal medulla (interior) • Composed of modified post-synaptic sympathetic neurons • Releases mostly epinephrine. • Has effects similar to those triggered by sympathetic nervous system Adrenal medulla hormones HO HO -CH-CH2 - N-CH3 epinephrine OH H Effects of epinephrine: • causes elevated blood glucose level • stimulates glycolysis & fatty acid use • increases cardiac output & blood pres • shifts blood flow to skeletal muscle • increases rate and depth of respiration 2 Organ responses to Epinephrine Causes glycogen Causes fatty acid release degradation in muscle from adipose tissue fatty glycogen acids trigly- cerides lactate glycerol muscle lactate adipose tissue Causes release of glycogeno lysis glucose from liver glucose ...elevated plasma level liver Hormone action time Epinephrine is in group of fast-acting hormones Fast-acting Hormones Slow-acting Hormones • Norepinephrine • Throxine • Epinephrine • Cortisol • Insulin • Growth hormone • glucagon • Estrogens • Androgens Hormone control of metabolism (Pathway/metabolic effects) Insulin Glucagon Epinephrine Cortisol ⇑ Glycogenesis ⇑ Gluconeogenesis ⇑ Glycogen degrad ⇑ Protein degradation ⇑ Glycolysis ⇑ Glycogen degrad ⇑ Glycolysis (effect in muscle) ⇑ Lipid synth (effect in liver) ⇑ Lipid degrad ⇑ Protein synth ⇑ Protein synth ⇑ Gluconeogenesis ⇑ Glycogen degrad (effect in liver) 3 Endocrine disfunctions CH2OH C=O HO OH Cushing’s syndrome – excessive cortisol resulting in loss of muscle protein O CH2OH HO C=O Addison’s disease – insufficent aldosterone O C + causing cardiac disturbance due to high K O O Adrenogenital syndrome – excessive androgen causing virilization in female HO Steroid synthesis cholesterol cholesterol HO CH2OH pregnenolone C O CH3 progesterone CH3 progesterone O 17-OH progesterone OH testosterone desoxycorticosterone O testosterone 19-Nor-testosterone OH cortisol 17-ß-estradiol HO 17-ß-estradiol Vitamin D3 synthesis HO cholesterol OH CH2 HO 1,25-dihydroxy Vit D3 4 Hormone control of Calcium levels Parathormone Calcitonin Vitamin D. Renal reabsorption of Ca ⇑ - - Intestinal absorption of Ca - - ⇑ Ca mobilization from bone * ⇑ ⇓ - Serum Ca level ⇑ ⇓ ⇑ * Ca mobilization results from action on hydroxyapatite(the mineral matrix of bone) by acid phosphatase released from osteoclasts. Ovarian follicles & corpus luteum Follicular phase - FSH control follicle cells (estrogen synthesis) primary follicles secondary oocyte mature follicle LH triggered ovulation ovum corpus luteumluteum Luteal phase - LH control Hormones of the ovaries Hormones of the ‘Follicular’ phase: O O OH OH HO HO HO estriol estrone 17-ß-estradiol (the “estrogens”) The ‘Luteal’ phase CH2OH C O CH3 CH3 O progesterone 5 Hormonal effects of estrogens General effects: • stimulates bone elongation and then closure of the epiphyseal plates • produce a general ‘anabolic’ effect • stimulates “female” pattern of fat distribution • stimulates mammary gland growth Reproductive system effects: • stimulates growth of uterus & fallopian tubes • stimulates growth of external genitalia Synthetic estrogen OH HO Diethylstilbestrol (DES) 17-ß-estradiol Diethylstilbestrol (DES) is a synthetic nonsteroidal estrogen that binds estrogen receptors. It was formerly used to prevent premature labor and also used as a feed additive to promote growth of livestock and poultry. It has been linked to increased risk of vaginal or cervical carcinoma. Effects of progesterone • maturation of uterine mucous glands • stimulates uterine glands to secrete mucus • blocks androgen effects (competes for binding) 6.
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