Goeli- Antioxidants Flashcards

1
Q

How do cells protect themselves against damage by ROS and other radicals?

A
  1. Compartmentalization of free radical production
  2. Metal sequestration (Metals used in fenton rxn)
  3. Repair processes
  4. Defense enzymes
  5. Endogenous and Exogenous anti-oxidants
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2
Q

What is superoxide dismutase?

A

An enzyme that converts superoxide anion to hydrogen peroxide and 02

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3
Q

Why is superoxide dismutase referred to as the “primary defense against oxidative stress”?

A

Because the superoxide free radical is a strong initiator of chain reactions. If you convert it to hydrogen peroxide you can neutralize it.

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4
Q

What enzyme is implicated in familial ALS (Lou Gherig’s)?

A

Superoxide Dismutase

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5
Q

What are the three enzymatic antioxidants?

A

Catalase
Glutathione
Superoxide Dismutase

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6
Q

What are the 6 dietary anti-oxidants?

A

vit: ACE
Carotenoids
Bioflavanoids
Co Q10

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7
Q

What are non-ezymatic anti-oxidants?

A

Antioxidants convert free radicals to a non-radical/non-toxic form by donating e to fill an unpaired orbital (most donate a H atom to the radical)

*often have a conjugated double bond system (aromatic ring)

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8
Q

Vit E is also known as….

A

alpha-tocopherol

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9
Q

Vit E is found in what foods…

A
corn
nuts
olives
green leafy vegetables
vegetable oils
wheat germ
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10
Q

What are the characteristics of Vit E def?

A

Uncommon
hemolytic anemia d/t fragility of RBCs
myopathy
neurologic deficits d/t degeneration of neurons

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11
Q

What are the two impt functions of vit C?

A

Collagen synthesis

Donates e to Vit E so it can participate in other rxns

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12
Q

What are the characteristics of Vit C def?

A

Scurvy!!

Impaired wound healing
bleeding ecchymoses
swollen gums
anemia
enlargement and keratosis of hair follicles
lethargy
depression
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13
Q

What is beta-carotene?

A

A pre-cursor for Vit A

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14
Q

What vitamin def leads to night blindness and is the number 1 cause of non-accidnetal blindness world wide?

A

Vit A deficiency

*Also causes: follicular hyperkeratosis, xeropthalmia

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15
Q

What foods are flavenoids in?

A

red wine, green tea, chocolate, and other plant derived foods

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16
Q

What do flavenoids do?

A

Inhibit enzymes (XO) responsible for superoxide anion production

Chelate Fe and Cu to preven the fenton rxn

17
Q

What endogenous antioxidant is responsible for free-radical trapping in plasa?

A

Uric acid

18
Q

What is Melatonin and why is it unique?

A

Neurohormone secreted by the pineal gland.

Donates electrons to neutralize free radicals.

It has joint hydrophillic/hydrophobic nautre which allows it to pass through membranes and the BBB