Etiology of type 1 DM Immune mediated
-Autoimmune markers: chromosome 6
-HLA: DR3 & DR4 MHC genes
Idiopathic
-without autoimmune markers or HLA association
Moleuclar mimicry of vriruses
Etiology of type 2 DM Environmental factors: Sedentary lifestyle.
•Dietary habits
•central obesity
•first-degree relatives have 5- to 10-fold higher risk
Metabolic defect in type 2 DM •Insulin resistance
Β-cell dysfunction
Cause of insulin resistance in diabetes •Non-esterified free fatty acids
•Adipokines
•Chronic inflammation in adipose tissue
How inflammation in obesity causes insulin resistance •Excess FFAs within macrophages and cells activate the Inflammasome (a
multiprotein cytoplasmic complex) and secret cytokine interleukin IL-1 & •additional
proinflammatory cytokines. Act on the major sites of insulin action and produce
insulin resistance
Classical triad of DM 1. Polydipsia
2. Polyphagia
3. Polyuria.
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