[M6] Part 4: Gonadal Hormones Flashcards
Since gonadal hormones are also steroid hormones, the process of synthesis is also called ____
steroidogenesis
male hormones
Testicular steroidogenesis
female hormones
Ovarian steroidogenesis
Steroidogenesis still requires ___
Cholesterol
In the ___, testosterone is converted to estradiol and androstenedione is converted to estrone
ovaries
In the ovaries, testosterone is converted to ___ and androstenedione is converted to ____
estradiol
estrone
In the ovaries, ___ is converted to estradiol and ____ is converted to estrone
testosterone
androstenedione
tissues aside from the testis and ovaries
Peripheral tissues
In the peripheral tissues:
- Testosterone is reduced to ___
dihydrotestosterone
T/F: Testosterone is more potent than Dihydrotestosterone
FALSE; Dihydrotestosterone is more potent than testosterone
Responsible for the masculinization of external genitalia
dihydrotestosterone
In the peripheral tissues
- _____ (___) are converted to testosterone
DHEA
Adrenal androgens
In the peripheral tissues
Adrenal androgens (DHEA) are converted to ____
testosterone
In the peripheral tissues
- Estriol is hydroxylated to ____
estradiol
In the peripheral tissues
___ is hydroxylated to estradiol
Estriol
In the peripheral tissues
- Conversion of androstenedione and testosterone to __ and ___, respectively
estrone
estradiol
In the peripheral tissues
- Conversion of ____ and ___ to estrone and estradiol, respectively
androstenedione
testosterone
Enumerate the TRANSPORT PROTEINS
Sex Hormone-Binding Globulin (SHBG)
Corticosteroid-Binding Globulin (CBG)
Albumin
TRANSPORT PROTEINS
Transports androgens and estrogens
Sex Hormone-Binding Globulin (SHBG)
What does SBHG transports?
Androgens and Estrogens
TRANSPORT PROTEINS
Delivers progesterone and glucocorticoids
Corticosteroid-Binding Globulin (CBG)
What does CBG delivers?
Progesterone and Glucocorticoids
____ of sex hormones are protein bound
98% – 99%
___ of sex hormones are unbound or free
1% – 2%
___ or __sex hormones are biologically active
Free
unbound
Protein-bound sex hormones (can/cannot) diffuse into the ___, therefore, they cannot interact with their target cells
CANNOT
vascular system
Principal androgen hormone in the blood regardless if female or male
TESTOSTERONE
TESTOSTERONE
Among females, they are converted to ____
estrogen
Most potent androgen among males
TESTOSTERONE
TESTOSTERONE
Synthesized by the ______ of ____
Leydig cells of testis
TESTOSTERONE
In males, ___ are derived from the Leydig cells
95%
TESTOSTERONE
The remaining 5% are derived from the conversion of ____ to ___ to ___
DHEA
androstenedione
testosterone
Production is controlled primarily by FSH and LH from the pituitary gland
TESTOSTERONE
TESTOSTERONE
Production is controlled primarily by ____ and ___ from the pituitary gland
Follicle stimulating hormone (FSH)
Luteinizing hormone (LH)
T/F: FSH and LH are both seen in male and female even though they are named in reference to menstrual cycle
true
TESTOSTERONE
In males, ____ acts on the germinal stem cells while ___ acts on the Leydig cells
FSH
LH
Sa Leydig cells, LH will stimulate the conversion of _____ to form
cholesterol
testosterone
The concentration or amount of testosterone is also affected by several physiologic factors. enumerate (3)
Circadian rhythm
Obesity
Age
CONC. OF TESTOSTERONE
Circadian rhythm
Peak:
after waking up, usually 8am
CONC. OF TESTOSTERONE
Circadian rhythm
Lowest:
8 PM
↓ plasma testosterone
Obesity
gradual reduction of testosterone when a male is aging specially after 30 years old (↓ of 110 ng/dL per decade)
AGE
AGE
gradual reduction of testosterone when a male is aging specially after___ (↓ of ___ per ___)
30 years old
110 ng/dL
decade
Functions for growth and development of the reproductive system of males
TESTOSTERONE
TESTOSTERONE
RV (serum):
3.9 – 7.9 ng/mL
_TESTOSTERONE
Transport protein:
___ (50%)
_________ (45%)
Albumin
Sex hormone-binding globulin
TESTOSTERONE
Transport protein:
Albumin (___)
Sex hormone-binding globulin (____)
50%
45%
T/F: Measurement of transport proteins is essential among males because the concentration of these binding proteins can determine the level of testosterone
True
Kung mataas ang ___, mataas din ang testerone
sex hormone binding globulin (SHBG)
Primary hypogonadism
Hypergonadotropic Hypogonadism
Low testosterone
Hypergonadotropic Hypogonadism
Elevated FSH or LH
Hypergonadotropic Hypogonadism
Impaired sperm production
Hypergonadotropic Hypogonadism
Results to infertility or sterility
Hypergonadotropic Hypogonadism
Enumerate the conditions associated with Hypergonadotropic Hypogonadism
Klinefelter’s Syndrome
5-Reductase Deficiency
Myotonic Dystrophy
Sertoli Cell-Only Deficiency
Testicular Injury And Infection
Testicular Feminization Syndrome
Also known as XXY
Klinefelter’s Syndrome
Klinefelter’s Syndrome
a.k.a
XXY
Male patients with three sex chromosomes
Klinefelter’s Syndrome
Klinefelter’s Syndrome
Male patients with ___ sex chromosomes
three
Klinefelter’s Syndrome
Patients have:
small testicles,
exhibit gynecomastia; and
azoospermia
enlargement of the breast
Gynecomastia
presence of semen with no sperm cells
Azoospermia
converts testosterone to dihydrotestosterone
5-reductase
5-reductase
converts testosterone to ____
dihydrotestosterone
↓ dihydrotestosterone
5-Reductase Deficiency
responsible for the masculinization of the external genitalia
Dihydrotestosterone
Patients have physical development similar to a female phenotype
5-Reductase Deficiency
Characterized by cryptorchidism
5-Reductase Deficiency
5-Reductase Deficiency
Characterized by ___
cryptorchidism
Presence of ambiguous genitalia
cryptorchidism
Characterized by muscle dystonia
Myotonic Dystrophy
Myotonic Dystrophy
Characterized by ___
muscle dystonia
Involuntary contraction of muscle
muscle dystonia
Myotonic Dystrophy
Patients also exhibit:
testicular failure
Myotonic Dystrophy
Patients also exhibit: testicular failure, especially at the ___ of life
4th decade
Also known as germ cell aplasia
Sertoli Cell-Only Deficiency
Sertoli Cell-Only Deficiency
a.k.a
Germ cell aplasia
no cell growth
Aplasia
Sertoli Cell-Only Deficiency
Patients present with:
Small testis
azoospermia
increased FSH;’ and
normal to decreased testosterone
During biopsy, testis will show absence of spermatozoa
Sertoli Cell-Only Deficiency
_Sertoli Cell-Only Deficiency
During biopsy, testis will show absence of _____
spermatozoa
Testicular Injury And Infection
Example:
mumps orchitis
Inflammation of the scrotum due to mumps infection
mumps orchitis
Most severe form of androgen resistance
Testicular Feminization Syndrome
Testicular Feminization Syndrome
Most severe form of ___ resistance
androgen
There is normal level of testosterone but there is resistance
Testicular Feminization Syndrome
Yung mga target tissue ng testosterone hindi nagrereact in response to testosterone (walang receptors)
Testicular Feminization Syndrome
Testicular Feminization Syndrome
Patients have:
Patients have female-like genitalia with intra-abdominal testis