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NBME 16 Answers

nbme16/Block 2/Question#50 (reveal difficulty score)
A 35-year-old man comes to the physician ...
Adenylyl cyclase ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
tags: endo repeat

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submitted by geekymle(11)
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i tried but i'm not able to reason this question. can anyone please help me on this?

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sunnyd  I found a good explanation in the discussion here: https://forums.studentdoctor.net/threads/nbme-16-help.1059939/page-2 +2
geekymle  thank you! it was the wording of the question which got me!! +1
andro  I think there were two possible ways of approaching this. The first was by appreciating that the tumor cells ( which release Growth Hormone ) would express growth hormone releasing hormone receptors GHRH receptors - GHRH uses the Gs signalling pathway ( Net effect an increase in cAMP from the increased activity of adenyl cyclase ) The second and more straight forward approach From the stem of the question already they told us we are dealing with an overactivation of the G alpha stimulatory subunit . If the GTPase aint working ( meaning it cant be inactivated ) , the effect would be an increase in the activity of adenyl cyclase +5
meryen13  well I know you guys probably thought its a jam kinase because of somatotroph adenoma. we know growth hormone has a jar/ kinase right? but the question was really sneaky and mentioned that there is a G alpha s subunits protein!! that should remind you that Gs activates adenylyl cyclase to increase CAMP. the key world was Gs (and I didn't think about it cause I just saw somatotropin adenoma) +3
m0niagui  where in FA2020 will I find reference to this? I'm still at a loss ;/ +1
kard  m0niagui, Just Get this GHRH (Gs)cAMP ---->GH(Jak/STAT), And you can check all of them on the "Signaling Pathways of Endocrine Hormones" +3
chaosawaits  kard ftw! +
an1  @m0niagui page 337 FA 2020 +



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