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BC #16 Vitamins.txt
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What are the three major uses of vitamins? (CAS)
1) coenzymes
2) Antioxidants
3) signaling molecules
When are the three times your body has an increased demand for vitamins? PAS
1) Pregnancy
2) Alcohol
3) Stress
What is the active form of Thiamine?
Thiamine pyrophosphate
What vitamins can be dangerous if ingested too often or too much at a time? (8)
vitamin B 6, niacin, folate, vitamin C, vitamin A, D, E, K
What are the four uses for Thaimine as a coenzyme?
Transketolase (TK) reaction (HMP shunt)
PDHC
alpha-ketoglutarate dehydro (TCA cycle)
Branched-chain α-keto acid dehydrogenase
What is the ultimate result of Thiamine deficiency?
Lack of ATP production = cell death and lack of function
What is a major disease caused by Thaimine deficiency?
Beriberi
***2 types Dry and Wet
What are dry and wet beriberi?
***Come from Thiamine deficiency
Dry:
peripheral neuropathy
Wet:
Cardiovascular symptoms
Where is Thiamine deficiency rare/not rare and why?
Rare:
Western Countries due to fortified grains
Not rare:
East Asia due to milled rice
What type of neuropathy is cerebral beriberi?
Central neuropathy
What are the two types of cerebral beriberi and their symptoms?
1)
Wernicke's encephalopathy
: Gait, stance, confusion
2)
Korsakoff's psychosis
: memory loss, amnesia
Why do you not want to treat a Thiamine deficient patient with glucose?
They have PDHC blocked
This will cause all glucose to be converted into Lactate
Cerebral lactic acidosis
What is a drug that inhibits TPP?
5-fluorouracil
What type of vitamin is a pyrodixin derivative?
Vitamin B6
What is the active form of Vitamin B6?
Pyridoxal phosphate
What three groups of people can become Vitamin B6 deficient?
1) Alcoholics
2) Newborn babies of B6 deficient mothers
3) women taking oral contraceptives
What two drugs are known to inhibit Vitamin B6?
Isoniazid
L-dopa
What neuropathy is a symptom of B6 excess?
Sense neuropathy
What is another name for Niacin?
Vitamin B3
What are the two active forms of Vitamin B3?
1) Niacin
2) Nicotinamide
What are the 2 diseases caused by Vitamin B3 deficiency?
Pellagra (rough skin)
Hartnup
What are the four Ds of Pellagra?
1) Diarrhea
2) Dementia
3) Dermatitis
4) Death
What group most commonly gets Vitamin B3 deficiency?
Alcoholics
What drug can cause Pellagra?
5-fluorouracil
What is the active form of Folic acid?
Folate
What is the active form of Vitamin B12?
Cobalamines
What is THF used for?
One-carbon metabolism
What are the two pathways for Vitamin B12 usage?
1 ) conversion of homocysteine to methionine through homocysteine methyltransferase (coenzyme)
2) methylmalonyl-CoA to succinyl-CoA
What is required in the stomach to release Vitamin B12?
Pepsinogen - Pepsin
What problem arises during folate deficiency?
Neural tube defects
What drug inhibits folate?
Methotrexate
What are the two active forms of Riboflavin (vitamin B12)?
Flavin mononucleotide (FMN)
Flavin adenine dinucleotide (FAD)
What are the active forms of Vitamin A?
Retinol
Retinal
Retinoic Acid
Author
kepling
ID
61670
Card Set
BC #16 Vitamins.txt
Description
BC #16 Vitamins
Updated
2011-01-25T21:56:09Z
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