Metabolic liver disease Flashcards

1
Q

where is most of the iron in the body? In what form?

A

65% in hemoglobin. 35% in storage form (either ferritin or aggregates of ferritin called hemosiderin)

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2
Q

where is iron stored?

A

In Kupffer cells and hepatocytes

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3
Q

transferrin

A

iron transporter found in plasma. Combines with toxic iron to convert it to storage form (ferrritin)

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4
Q

how does the body balance iron content?

A

loses 1 mg in dead cells/day. 1mg absorbed/day in diet

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5
Q

cause of primary and secondary hemochromatosis

A

Autosomal recessive C282Y point mutation on HFE gene. Increased duodenal Fe absorption. Secondary due to chronic transfusions.

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6
Q

Hepcidin: released from? fxn? deficiency? regulated by?

A

released by liver to degrade ferroportin, thus inhibiting iron release from enterocytes into blood. Hepcidin deficiency leads to iron overload. Regulated by HFE (HFE mutation leads to Fe overload)

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7
Q

what organs are most often damaged in iron overload

A

liver, skin, pancreas, heart, pituitary, joints

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8
Q

hemochromatosis triad

A

“bronze diabetes”: DM (pacreas), bronze skin, cirrhosis

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9
Q

alpha 1 AT: function, what are mutant isoforms? what happens in deficiency? What diseases result

A

protease inhibitor. PiZZ. Synthesized in liver but mutant can’t be secreted to travel to lungs. Accumulates in ER of hepatocytes. Liver disease and emphysema

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10
Q

ceruloplasmin

A

Cu transport protein

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11
Q

Wilson Disease: Defect? result?

A

ATP7B copper transporting ATPase (no energy to transport Cu into bile and link it to ceruloplasmin in blood. Cu overload in hepatocytes causing ROS and free copper ions in blood.

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12
Q

what tissues are affected in Wilsons

A

liver, brain (basal ganglia), cornea, kidneys, joints

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13
Q

Findinds in wilson’s

A

decreased Ceruloplasmin, Cirrhosis, Corneal deposits (Kayser-Fleischer rings), Carcinoma.
Hemolytic anemia
basal ganglia deterioration (parkinsonism)
Asterixis
Dementia, dyskinesia, dysarthria

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14
Q

tx for wilsons

A

penicillamine

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