Autoimmune Destruction of B-Cells in Diabetes

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What proinflammatory cytokines are produced by macrophages when activated by diabetogenic factors?

Interleukin-1, tumour necrosis factor-alpha, interferon-gamma

Which gene is expressed in the B-cell by IL-1, leading to increased nitric oxide production and contributing to beta-cell destruction?

INOS gene

What effect do nicotinamide and aminoguanidine have on beta-cell destruction in type 1 DM?

Inhibit INOS expression and reduce NO formation

What is the significance of reduced GLUT 2 levels on the cytoplasmic membrane of beta cells?

<p>Reduced sensitivity to glucose and decreased insulin production</p> Signup and view all the answers

How does immune-mediated type 1 DM typically present in terms of age?

<p>Mostly in children and adolescents</p> Signup and view all the answers

Which of the following markers is NOT a typical indicator of immune destruction of B-cells?

<p>Autoantibodies to proinsulin</p> Signup and view all the answers

What is the main role played by T lymphocytes in the pathogenesis of Type 1 Diabetes Mellitus?

<p>Initiation and development of the autoimmune process leading to the destruction of insulin-synthesising cells</p> Signup and view all the answers

Which of the following is NOT a metabolic marker of Type 1 Diabetes Mellitus?

<p>Proinflammatory cytokine levels</p> Signup and view all the answers

Which isoform of NO synthase appears in cells when the levels of proinflammatory cytokines increase and can be secreted directly into the B-cell?

<p>Inducible NO synthase (iNOS)</p> Signup and view all the answers

Which cells initiate the cascade of immune responses leading to B-cell destruction in Type 1 Diabetes Mellitus?

<p>Resident macrophages of the islets of Langerhans</p> Signup and view all the answers

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