Steroids Flashcards
Most important mineralocorticoid
Aldosterone
Major adrenal androgen
DHEA
Major endogenous precursor of estrogen in women after menopause
Adrenal androgen
Glucocorticoid synthesized from
Cholesterol
Glucorticoids rate of secretion follows __________ governed by pulses of _______
Circadian rhythm
ACTH
Glucorticoids in plasma bound to circulating
Protein
Glucorticoids
In plasma also
Alpha 2 globulin synthesized by the liver, 90% of circulating hormone
Corticosteroid binding globulin
Glucorticoids
I plasma also, remaining free or loosely bound to
Albumin
Glucorticoids
Large capacity
Decrease affinity for cortisol
Albumin
Largely bound to albumin than CBG
Synthetic corticosteroids (dexamethasone)
Glucorticoids
1% excreted unchanged as free
Cortisol in urine
Cortisol
20% converted to cortisone by
11 hyroxysteroid dehydrogenase
Cortisol
Metabolism in
Kidney
Cortisol
Excreted as
Dihydroxy ketone
Cortisol
Measured as
17 hydroxysteroids
Cortisol
Conjugated with
Glucoronic acid or
Sulfate
2 genes for corticoid receptor
Glucorticoids receptor
Mineralocorticoid receptor
Classic ligand activated glucocorticoid receptor
Hgr alpha
Dose not bind glucocorticoids
Inhibit effects of hormone activated hGR
hGR beta
Glucocorticoid binding domain
Carboxyl terminal
Cortisol
DNA binding domain
Middle of CHON
9 cysteine residues
2 fingers
ZINC
Transactivation activity of receptor
Increase specificity
Amino terminal domain
Cortisol
Steroids receptor co regulators
Co activator
Co repressors
Cortisol
Physiologic effect
Homeostatic responses by
Insulin and glucagon
Cortisol
Stimulate in fasting state
Gluconeogenesis
Glycogen
Cortisol
Metabolic effects
Gluconeogenesis
Lipogenesis
Lipolysis
Cortisol
Catabolic and anti anabolic effect on bone
Osteoporosis
Cushing syndrome
Catabolic and anti anabolic effects on children
Decrease growth
Cortisol
Effect in inflammation
Function of leukocyte
Suppress cytokines and chemokines
Increase neutrophils
Decrease lymphocyte, monocyte, eosinophils and basophils
Cortisol
Anti inflammatory and immunosupresive effect
Lahat decrease, macrophage
Antigen or mitogen response
Prostaglandin (kaya na activate si phospholipase A2)
Mast cell
Capillary permeability
Decrease din si histamine na nag rerelease ng basophils
Except, kasi sya lang ang increase
Neutrophils
Kapag nakita mo si leukocytes, sama mo na rin
Increase amount of glucocorticoids
Initially - insomnia and euphoria lead to deppresion
Late- increase ICP (pseudo tumor cerebri)
Cortisol
If given chronically it will suppress
ACTH
Growth hormone
TSH
LH
Cortisol
If given in large dose for
Peptic ulcer
Fat redistribution Antgonize effect of vitamin D on Ca absorption
Cortisol deficiency
Basta may kinalaman sa pag ihi
Synthetic corticosteroids
Source
Cholic acid
Synthetic corticosteroids
Prednisone rapidly converted to active product
Prednisolone
Adrenocortical insufficiency
Acute and chronic Addison disease
Chronic Addison
Characterized by
Weight loss
Hypotension
Hyperpigmentation
Inability to maintain blood glucose during fasting
Chronic Addison
Primary adrenal insufficiency
Hydrocortisone
Chronic Addison
Supplemented by
Fludrocortisone a salt retaining hormone
Synthetic long acting and devoid of salt retaining activity should not be administered
Acute Addison
Immediate treatment
Large amount of parenteral hydrocortisone like
Sodium succinct and phosphate
Pwede ka mag bigay ng salt retaining hormone kung ang hydrocortisone level mo ay 50mg/day na
Adenocortical hypo and hyper function
Congenital adrenal hyperplasia
Cushing syndrome
Aldosteronism
Congenital adrenal hyperplasia
Cause
Decrease or lack of 21 beta hydroxylase activity
Increase 17 hydroxy progesterone
Congenital adrenal hyperplasia
If defects is in 11 hydroxylation
Increase deoxycorticosterone that leads to
HPN with or without hypokalemia
Congenital adrenal hyperplasia
If defect is in 17 hydroxylation (adrenal and gonads)
Hypogonadism
Congenital adrenal hyperplasia
Best treatment for infant
IV hydrocortisone
Congenital adrenal hyperplasia
For stabilized patient
Oral hydrocortisone
Congenital adrenal hyperplasia
Greater ACTH suppression with increasing growth hormone
Prednisone
Congenital adrenal hyperplasia
Orally with added salt to maintain BP, renin activity and electrolytes
Fludrocortisone
Cushing syndrome
Result of bilateral adrenal hyperplasia secondary to
ACTH secreting pituitary adenoma
Cushing syndrome
Treatment
Surgery
Radiation
Resection
Drug- 300 mg soluble of Hydrocortisone ( continous on the day of surgery dapat slow lang ha.
Cushing syndrome
If rapid reduction of hydrocortisone
Withdrawal syndrome
Joint pain
Fever
Aldosteronism
Primary aldosteronism
Clinical findings
HPN Weakness Tetany - dahil sa renal loss of K Hypokalemia Alkalosis Increase Na
Aldosteronism
Secondary aldosteronism
Decrease renin and angiotensin 2 activity
Aldosteronism
Treated with
Fludrocortisone or
Deoxycorticosterone acetate IM for 3 days
Aldosteronism
Diagnostic and therapeutic
Spironolactone
Diagnosis of Cushing syndrome
Dexamethasone suppression test
Urine is assayed for cortisol or metabolites
Liddle’s test
Lung maturation in the fetus
IM betametasone
Medium and intermediate acting Glucorticoids
Prednisone and prednisolone
Prolonged therapy is anticipated
CXR and tuberculin test for TB
Major undesirable effect
Iatrogenic Cushing syndrome
Patients treated with glucocorticoids should be on
Increase CHON and potassium enriched diets
Aldosterone
Synthesized in
Zona glomerulosa
Aldosterone
Produce stimulation of its release
ACTH
Decrease section of Cortisol while increasing secretion of aldosterone
Decerebration
Aldosterone
Promotes
Reabsorption of Na in distal convoluted and cortical collecting tubules
Excretion of K and hydrogen
Precursor of aldosterone
Deoxycorticosterone
Deoxycorticosterone DOC for
Adenocortical carcinoma
Congenital adrenal hyperplasia
Potent steroid with both glucocorticoid and mineralocorticoid activity
Fludrocortisone
DHEA additional effects
Interaction with GABA and glutamate receptors
LUPUS
Women with adrenal insufficiency
Blocks conversion of cholesterol to pregnenolone
Aminoglutethimide
Aminoglutethimide
Decrease or eliminate estrogen production in patients with
Carcinoma of the breast
Aminoglutethimide
Adverse effect
Lethargy and skin rash
Aminoglutethimide
Can be use in conjunction with
Metyrapone or
Ketoconazole
Aminoglutethimide
Decrease secretion in patients with Cushing do not respond to
Mitotane
Aminoglutethimide
Enhance metabolism of
Dexamethasone
Anti-fungal imidazole
Ketoconazole
Potent, nod selective inhibitor of adrenal and gonadal steroid synthesis
Ketoconazole
Ketoconazole
Treatment
Cushing syndrome
Ketoconazole
Adverse effect
Hepatotoxicity
Selective inhibitor of steroid 11 hydroxylation, interfering with corticosterone synthesis
Metyrapone
Metyrapone
Related to
ACTH
Metyrapone
Adverse effect
Transient dizziness and GIT disturbance
The only adrenal inhibiting medication that can be administered to pregnant women with Cushing syndrome
Metyrapone
Metyrapone
Major adverse effect
Salt and water retention
Hirsutism
Metyrapone
Pituitary function
Midnight orally
Blood drawn at 8am
38 hydroxysteroid dehydrogenase inhibitor
Trilostane
Trilostane
Adverse effect
Gastrointestinal
Newest of the steroid inhibitors
Arbiraterone
Arbiraterone
Blocks
17 alpha hydroxylase and 17,20layse
Arbiraterone
Prevented by concomitant administration of
Dexamethasone
Arbiraterone
Treatment
Refractory prostate cancer
RU 486
Antagonist at steroid receptor
Mifepristone
Mifepristone
Blocking the
Glucocorticoid receptors
Mifepristone
Bind to
Albumin
No affinity to CBG
Drug related to DDT class of insecticides
Mitotane
Mitotane
Non selective cytotoxic action on adrenal cortex in
Dogs
Mitotane
Treatment
Adrenal carcinoma
Mitotane
Adverse effect
Diarrhea
Antagonist of mineralocorticoids
Spironolactone
Eplerenone
Drospirenone
Spironolactone
7 alpha acethylthispironolactone
Slow onset
Spironolactone TREATMENT
Primary aldosteronism
Hirsutism in women
More selective than Spironolactone
Eplerenone
Adverse effect for hyperkalemia
Treatment for hypertension
Antagonize the effect of aldosterone
Drospirenone
Progestin
Oral contraceptive
Major glucocorticoid
Cortisol