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Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
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Acute kidney injury (AKI) causes are categorized into three primary categories based on the location of the injury: prerenal, intrarenal (or intrinsic), and postrenal causes. This classification guides clinical management and illustrates how different pathways can impair kidney function.Etiology and Pathophysiology of Acute Kidney Injury1. Prerenal causesEtiology: Prerenal Acute Kidney Injury, the most common type, occurs when reduced blood flow to the kidneys decreases filtration capacity...
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Mechanism of Kemeng Fang's Inhibition of Podocyte Apoptosis in Rats with Membranous Nephropathy through the PI3K/AKT Signaling Pathway
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Antiviral innate immunity disturbs podocyte cell function.

Michifumi Yamashita1, Carrie A Millward, Hiroyuki Inoshita

  • 1Department of Pathology, University Hospitals Case Medical Center, Cleveland Clinic, Cleveland, OH 44106, USA. mxy53@cwru.edu

Journal of Innate Immunity
|January 9, 2013
PubMed
Summary
This summary is machine-generated.

Viral infections can trigger Immunoglobulin A nephropathy (IgAN) flares. Glomerular podocytes sense viral double-stranded RNA (dsRNA), leading to cellular dysfunction and altered protein expression, impacting kidney health.

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Area of Science:

  • Nephrology
  • Immunology
  • Virology

Background:

  • Immunoglobulin A nephropathy (IgAN) is a leading cause of glomerulonephritis worldwide.
  • Disease exacerbations in ~60% of IgAN patients are linked to viral infections, but mechanisms remain unclear.

Purpose of the Study:

  • To investigate the role of glomerular podocytes in sensing viral byproducts and their impact on kidney function during viral infections.

Main Methods:

  • Assessed expression of double-stranded RNA (dsRNA) sensors (TLR3, RLHs) in podocytes.
  • Stimulated podocytes with dsRNA and analyzed intracellular signaling pathways (IRF3, NF-κB).
  • Evaluated effects of dsRNA on podocyte migration, protein expression, and albumin flux.

Main Results:

  • Podocytes express functional dsRNA sensors (TLR3, RLHs) and signaling machinery.
  • dsRNA activates IRF3 and NF-κB pathways, increasing pro-inflammatory protein synthesis.
  • dsRNA impairs podocyte migration, alters key podocyte proteins (nephrin, podocin, CD2AP), and increases albumin permeability.

Conclusions:

  • Innate immune responses to viral dsRNA in podocytes can disrupt normal kidney cell function.
  • These findings elucidate cellular mechanisms linking viral infections to IgAN exacerbations.