pigments
TRANSCRIPT
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PIGMENTSBY Dr Hasan AskariPATHOLOGY DEPARTMENT
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PIGMENTS
Pigments are colored substance.
It may be exogenous & endogenous.
Exogenous coming from outside the body.
Endogenous synthesized within the body.
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EXOGENOUS PIGMENTS
Carbon (coal dust),air pollutant & tattooing. Mechanism: Inhaled macrophages (alveoli) transported to
lymph node (tracheobronchial region). Black color of lungs (anthracosis) & lymph node. In coal miners carbon dust induce fibroblastic
reaction or emphysema coal worker’s pneumoconiosis.
Tattooing phagocytosis by dermal macrophages.
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EXOGENOUS PIGMENTS
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EXOGENOUS PIGMENTS
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TATTOOS
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TATTOO
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EXOGENOUS PIGMENTS
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ENDOGENOUS PIGMENTS
Lipofuscin (lipochrome or wear & tear pigment) Melanin Hemosiderin
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ENDOGENOUS PIGMENTS
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ENDOGENOUS PIGMENTSPIGMENTS
LIPOFUSCIN: • It is insoluble polymer of lipid & phospholipid with
protein by lipid peroxidation.• Yellow-brown color.• Not harmful.• It shows sign of free radical injury & lipid
peroxidation.• Mostly in liver & heart of aging, malnutrition &
cancer cachexia.
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ENDOGENOUS PIGMENTSPIGMENTS
MELANIN:• It is endogenous , non-hemoglobin derived black –
brown pigment.• In melanocytes enzyme tyrosinase catalyze the
oxidation of tyrosine to dihydroxyphenylamine.• OCHRONOSIS: (Homogentisic acid)- Occur in patient with alkaptouria (metabolic
disorder)- Black pigment deposide in skin, connective tissue &
cartilage.
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ENDOGENOUS PIGMENTS
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EENDOGENOUS PIGMENTSNDOGENOUS PIGMENTS
HEMOSIDERIN:• Storage form of iron hemoglobin derived golden-
brown granular or crystalline pigment.• Iron transported by transferin stored in cell by
apoferrin form ferritin excess iron excess ferritin form hemosidrin granules.
• Normally seen in mononuclear phagocytes.• E.g: bruises
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BRUISE
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Just chill