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Retired NBME 19 Answers

nbme19/Block 1/Question#26 (reveal difficulty score)
Niemann-Pick disease is characterized by ...
Decreased lysosomal hydrolase activity 🔍 / 📺 / 🌳 / 📖
tags: biochem Lysosomal

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submitted by corndog(18)
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ME: I think I finally have these stupid storage disorders down

NBME: Not so fast, partner

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vondran  ^ voted “best username” in high school +2
i_hate_it_here  Same bro +
chaosawaits  ME: OH DAMN! I ALMOST FELL FOR THE TRICK! I'M FINALLY WINNING! ALL THIS HARD WORK AND SACRIFICE DOES HAVE MEANING! NBME: lololololol +1



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submitted by cassdawg(1781)
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Niemann-Pick is a lysosomal storage disease that is a deficiency in sphingomyelinase that leads to a buildup of sphingomyelin (Niemann picks his nose with his sphinger)

Sphingomyelinase is considered a lysosomal hydrolase

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chaosawaits  I'm guessing the reason "decreased synthesis of ceramide" isn't the answer then is based on FA2019 p88. Since there are 3 different paths to make ceramide, losing one throught Niemann-Pick disease will not significantly decrease the ceramide production +2



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submitted by icedcoffeeislyfe(56)
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FA2020 pg 88--Lysosomal storage diseases

fts= AR, progressive neurodegeneration, hepatospenomegaly, cherry red macula, foam cells

deficienct enzyme= sphingomyelinase (a lysosmal hydrolase)--> build up of sphingomyelin

" No man picks his nose with his sphinger"

increased incidence in AShkenazi Jewish population

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chaosawaits  Niemann definitely does lol that little nose-picker +



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submitted by mdk(1)
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That's what I found: Sphingomyelinase is deficient in Niemann-Pick. Sphingomyelinase is an acidic lysosomal hydrolase. https://link.springer.com/chapter/10.1007/978-1-4613-1029-7_14

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