First Aid p. 395 Heme synthesis, porphyrias, and lead poisoning Essay Example
First Aid p. 395 Heme synthesis, porphyrias, and lead poisoning Essay Example

First Aid p. 395 Heme synthesis, porphyrias, and lead poisoning Essay Example

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  • Pages: 1 (236 words)
  • Published: September 26, 2018
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Lead poisoning
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Affected enzyme: Ferrochelatase and ALA dehydratase
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Ferrochelatase and ALA dehydratase
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Enzymes affected in lead poisoning

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Lead poisoning
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Accumulated substrate: Protoporphyrin, δ-ALA (blood)
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Lead poisoning
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Presenting symptoms: Microcytic anemia (basophilic stippling), GI and kidney disease.
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Lead poisoning
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Presenting symptoms: Children—exposure leads to mental deterioration. Adults—environmental exposure (e.g., batteries, ammunition) headache, memory loss, demyelination.
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Acute intermittent porphyria
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Affected enzyme: Porphobilinogen deaminase
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Porphobilinogen deaminase
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enzyme affected in Acute intermittent porphyria
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Acute intermittent porphyria
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Accumulated substrate: Porphobilinogen, δ-ALA, coporphobilinogen (urine)
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Acute intermittent porphyria

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Presenting symptoms: Painful abdomen Port wine-colored urine Polyneuropathy Psychological disturbances Precipitated by drugs (e.g., cytochrome P-450 inducers), alcohol, starvation
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Acute intermittent porphyria
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Treatment: glucose and heme, which inhibit ALA synthase
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glucose and heme, (which inhibit ALA synthase)
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treatment of Acute intermittent porphyria
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Porphyria cutanea tarda
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Affected enzyme: Uroporphyrinogen decarboxylase
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Uroporphyrinogen decarboxylase
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Enzyme affected in Porphyria cutanea tarda

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Porphyria cutanea tarda
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Accumulated substrate: Uroporphyrin (tea- colored urine)
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Porphyria cutanea tarda
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Presenting symptoms: Blistering cutaneous photosensitivity. Most common porphyria.
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Sideroblastic anemia (X-linked)
Sideroblastic anemia (X-linked)
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1
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Lead poisoning
Lead poisoning
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2
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Acute intermittent porphyria
Acute intermittent porphyria
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3
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Porphyria cutanea tarda
Porphyria cutanea tarda
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4
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Lead poisoning
Lead poisoning
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5
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aminolevulinic acid synthase
aminolevulinic acid synthase
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1

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aminolevulinic acid dehydratase
aminolevulinic acid dehydratase
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2
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porphobilinogen deaminase
porphobilinogen deaminase
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3
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uroporphyrinogen decarboxylase
uroporphyrinogen decarboxylase
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4
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ferrochelatase
ferrochelatase
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5
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