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Endocrinology > lecture10a > Flashcards

lecture10a Flashcards

1
Q

answer?

Response elements

A

DNA sequences bound by complex of steroid bound to its receptor/ part of promoter of gene

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2
Q

answer?

GRE

A

glucocorticoid response element

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3
Q

answer?

ERE

A

estrogen response element

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4
Q

answer?

VDRE

A

vitamin D response element

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5
Q

answer?

TRE

A

thyroid hormone response element

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6
Q

answer?

RARE

A

retinoic acid response element

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7
Q

answer?

GRE sequence

A

top 5’AGAACA(N)3 TGTTCT 3’ bottom 3’TCTTTGT(N)3 ACAAGA5’

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8
Q

answer?

ERE sequence

A

top 5’AGGTCA(N)3 TGACCT 3’ bottom 3’TCCAGT(N)3 ACTGGA5’

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9
Q

answer?

VDRE sequence

A

top 5’AGGTCA(N)3 AGGTCA3’ bottom 3’TCAAGT(N)3 TCCAGT5’

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10
Q

answer?

TRE sequence

A

top 5’AGGTCA(N)4 AGGTCA3’ bottom 3’TCCAGT(N)4 TCCAGT5’

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11
Q

answer?

RARE

A

top 5’AGGTCA(N)5 AGGTCA3’ bottom 3’TCCAGT(N)5 TCCAGT5’

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12
Q

answer?

T3 ligand independent repression

A

if no T3; CoR binds to RXR/THR heterodimer bound to positive TRE and represses gene expression

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13
Q

answer?

T3 ligand dependent transactivation

A

if T3 binds; RXR/THR binds CoA and activates gene expression

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14
Q

answer?

where is T4 converted to T3

A

liver and thyroid

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15
Q

answer?

what coverts T4 to T3 in liver

A

D1

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16
Q

answer?

what inactivates T3

A

D3; and turns it into rT3 and T2

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17
Q

answer?

what happens to T4 once it enters cell

A

it gets converted to T3 by D2

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18
Q

answer?

What happens to T3 once in cell

A

it translocates into nucleus; binds to RXR/TR heterodimer bound to TRE and activates gene expression with bound activator

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19
Q

answer?

What corepressors compete to bind with heterodimer?

A

NCor1; RAR; PPAR; VDR

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20
Q

answer?

What coactivators compete to bind with heterodimer

A

P160/SRCS and TRAP 220; nuclear receptors AR; ER; RAR; GR; VAR; PPAR

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21
Q

answer?

Does TR form dimer with RR?

A

yes

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22
Q

answer?

What does TR bind to?

A

TRE located on promoter of T3 target genes

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23
Q

answer?

If there is no T3; what does TR bind to?

A

TRE. Represses basal transcription.

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24
Q

answer?

How do corepressors work?

A

bind to TR and limit access to transcriptional machinery

25
Q

answer?

What does T3 binding trigger

A

dynamic exchange of co-repressors for coactivators on TRs

26
Q

answer?

How do coactivators work

A

they render chromatin more accessible for transcription

27
Q

answer?

physiological effects of thyroid hormone

A
  1. TH viewed as tissue growth factors 2.promotes normal fetal and childhood growth and CNS development 3. normal whole body growth does not occur in absence of thyroid hormones even in presence of adequate GH levels 4. TH enhances GH production by increasing transcpriton of GH gene in pituitary 5. TH exerts effects on thermogenesis and temperature regulation 6. affects most aspects of carb and lipid metabolism (in part by elevating levels of hormone receptors such as epi receptor)
28
Q

answer?

structure of long bone

A

epiphysis; metaphysis; diaphysis; metaphysis; epiphysis

29
Q

answer?

ossification center

A

where cartilage cells arrange themselves in a row

30
Q

answer?

TH receptors in reserve zone

A

TRalpha1/alpha2/Beta1

31
Q

answer?

TH receptors in proliferative zone

A

TRalpha1/alpha2/Beta1

32
Q

answer?

TH receptors in prehypertrophic zone

A

TRalpha1/alpha2/Beta1

33
Q

answer?

TH receptors in hypertrophic zone

A

none

34
Q

answer?

TH receptors in primary spongiosum

A

TRalpha1/alpha2/Beta1

35
Q

answer?

TR in embryogenesis of frog development

A

TH response genes expressed at basal level. No TR and TH. Facilitate embryonic organ development.

36
Q

answer?

TR in frog development after tadpole hatches

A

TR expression increases. Highe levels when tadpole feeding begins. RXR highly expressed. TR/RXR bind to TH response genes and repress them. Ensure proper tadpole growth and prevent premature metamorphosis. Endo TH levels rise and TH bound TR/RXR then activates TH response genes

37
Q

answer?

metabolic processes modulated by TH

A

basal metabolic rate; adaptive thermogenesis; body weight regulation; cholesterol synthesis and efflux; fatty acid synthesis and oxidation; bile acid synthesis; glucose metabolism

38
Q

answer?

TH and basal metabolic rate

A
  1. stimulated by T3; metabolic processes 2. T3 ligand stimulates it 3. downregulates Na+K+ATPase; SERCA-1; UCPs; UPL 4. interacts with adrenergic pathway
39
Q

answer?

TH and adaptive thermogenesis

A
  1. stim. By cold exposure; food ingestion 2. T3 ligand stimulates 3. downreg. UCP1 and PEPCK 4. adrenergic; bile acids; gluconeogenesis
40
Q

answer?

TH and body weight regulation

A
  1. stimuted by nutrient intake 2. T3 ligand integrates balance with nutrient intake signal 3. downreg. TRH; TSH; spot 14(thrsp); D2 4. TRH; leptin; adrenergic; CART; neuropeptide Y; D2
41
Q

answer?

TH and cholesterol synthesis and efflux

A
  1. stim. By chol levels 2. T3 ligand; up reg chol synthesis and efflux 3. downreg LOL-R and ABCA1 4. in sterol signaling; PPARalpha; LXR
42
Q

answer?

TH and fatty acid synthesis and oxidation

A
  1. fat intake; storage; long-chair fatty acids 2. T3 ligand; promotes lypolysis and Beta oxidation 3. downreg GPTig 4. in PPARalpha; adrenergic; LXR
43
Q

answer?

TH and bile acid synthesis

A
  1. stim by fat intake 2. T3 ligand decrease synthesis 3. downreg CYPTA1 4. in TGRS; D2; FXR; PPARalpha
44
Q

answer?

TH and glucose metabolism

A
  1. stim by carb intake; serum glucose/insulin 2. T3 ligand; upreg gluconeogenesis; impairs insulin secretion 3. downreg ACCl; GLUTH; ChREPB 4. in glucose; insulin; PPARalpha; LXR; SREBD; RXR
45
Q

answer?

which TH is more powerful in rats with no thyroid

A

T3

46
Q

answer?

how do T3; T4 and TSH react to depletion of dietary iodine

A

T3 and T4 go down; TSH rises

47
Q

answer?

what does iodine or TH deficiency in perinatal period cause

A

severe mental and physical retardatation; defness; paralysis; known as cretinism

48
Q

answer?

sporadic cretinism

A

result of athyrotic fetus developing in normal mother

49
Q

answer?

how does iodine deficiency affect the world

A

intellectual ability of millions of infants worldwide is affected

50
Q

answer?

clinical signs of hypothyroidism

A
  1. weight gain; coarse skin; hoarse voice; 2. feels cold; lethargic and depressd 3. changed tendon reflexes; muscles contract normally but relax slowly; generalized muscle weakness 3. reduced cardiac output 4. menstrual irregularities
51
Q

answer?

causes of hypothyroidism

A
  1. iodine deficiency 2. mutation in gene encoding TSH component or in THR or in pendrin gene or other iodine transporter gene 3. selenium deficiency 4. thyroid gland malignancy 5. hashimoto’s thyroiditis
52
Q

answer?

how do low TH levels affect body

A

delay proper growth and bone maturation; low thyroxin; rise in TSH; short stature; delayed skeletal maturation (autoimmune thyroiditis)

53
Q

answer?

clinical signs of hyperthyroidism

A
  1. weight loss; sweating; tremors; goitre 2. agitated and nervous; easy fatigability; heat intolerance 3. tachycardia and atrial fibrillation 4. muscle weakness and loss of muscle mass 5. diarrhea; shortness of breath; infertility; amenorrhea; rapid growth rate and accelerated bone maturation in children
54
Q

answer?

signs of GRAVES disease

A

optical issues like upperlid retraction; stare…; pretibial myxoedema (thickening of skin); others - vitiligo; clubbing of fingers; premature greying of the hair

55
Q

answer?

causes of hyperthyroidism

A

elevated TSH secretion due to a tumor. 2. Grave’s disease (TSH receptor activating antibodies) 3. Thyroid adenoma (with TSH receptor mutation showing constitutive activation) 4. excess dietary or medication-related iodine ingestion

56
Q

answer?

what causes GRAVES disease

A

unregulated synthesis and secretion of T3 and T4

57
Q

answer?

how does GRAVES disease show up on lab tests

A

elevated T4 in serum; increased uptake of radioiodine; TSH suppressed in serum; palpitation and tachycardia; exopthalmos due to enlargement of retroorbital tissues; increase of appetite but weight loss

58
Q

answer?

antithyroid drugs

A

propylthiouracil or methyl mercaptoimidazole/ block iodination of thyroglobulin by antagonizing thyroid peroxidase; less T3 and T4

Endocrinology (21 decks)

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