Albuminomics

Hyperoxidized Albumin Modulates Neutrophils to Induce Oxidative Stress and Inflammation in Severe Alcoholic Hepatitis

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Hyperoxidized Albumin Modulates Neutrophils to Induce Oxidative Stress and Inflammation in Severe Alcoholic Hepatitis

Bibliographic info

  • Authors: Sukanta Das, Jaswinder Singh Maras, Md. Shabir Hussain, Shvetank Sharma, Paul David, Sukriti Sukriti, Saggere Muralikrishna Shasthry, Rakhi Maiwall, Nirupama Trehanpati, Tej P. Singh, Shiv Kumar Sarin
  • Journal: Hepatology, 2017
  • Institution: Institute of Liver and Biliary Sciences (ILBS), New Delhi, India

Key question

Does hyperoxidized albumin (from severe alcoholic hepatitis patients) modulate neutrophil function to produce oxidative stress and inflammation, and how does this contribute to the pathology of severe AH?

Methods

  • Sample type: Human plasma/purified albumin
  • Cohort: Severe alcoholic hepatitis (SAH) n=90; alcoholic cirrhosis (AC) n=60; healthy controls (HC) n=30; 3-month follow-up or death
  • Exclusion: HCC; GI bleeding <42 days; liver transplant; prior albumin dialysis or IV albumin
  • Albumin purification: from each group’s plasma
  • Assays:
    • HSA isoform quantification by LC-MS (top-down); inter/intraday CV <8% and <0.01% for MW respectively
    • AOPP (Advanced Oxidation Protein Products): spectrophotometric (chloramine-T standard)
    • Neutrophil isolation from healthy controls → incubated with purified albumin from each group
    • DHR-123 flow cytometry for intracellular ROS in treated neutrophils
    • Respiratory burst measurement
    • 52-gene RT-PCR panel (neutrophil activation, ROS production, antioxidation, ER stress, autophagy, apoptosis, leukocyte migration, cytokines, TLRs)

Main findings

  1. Hyperoxidized albumin in SAH — distinct isoform profile from AC and HC; high HNA2 content; elevated AOPP plasma levels confirm systemic oxidative protein damage
  2. SAH albumin modulates healthy neutrophils:
    • Increases intracellular ROS production (DHR-123 assay) compared to AC albumin, HC albumin, or commercial (Baxter) albumin
    • Triggers respiratory burst (oxidative killing response)
  3. Intraday and interday CV <8% for isoform relative abundance — methodological validation note
  4. 52-gene neutrophil activation panel in SAH neutrophils vs HC: upregulation of TLR signaling, cytokine production genes, ER stress markers, altered autophagy/apoptosis — hyperoxidized albumin mimics the in vivo SAH neutrophil phenotype
  5. Disease hierarchy (SAH > AC > HC): oxidative state of albumin tracks directly with disease severity and degree of neutrophil activation

Mechanistic model

Severe AH → hepatocyte injury + systemic oxidative stress
↓
Albumin hyperoxidation (HNA2 dominant) + AOPP accumulation
↓
Hyperoxidized albumin acts as danger signal → neutrophil priming
↓
Intracellular ROS, respiratory burst, TLR activation, ER stress
↓
Amplifies systemic inflammation → accelerates liver injury (vicious cycle)

Clinical context

  • Disease: Severe alcoholic hepatitis (SAH) — acute-on-chronic, high 90-day mortality
  • Clinical staging: Followed for 3 months (90-day mortality endpoint)
  • Implication: Hyperoxidized albumin is not merely a biomarker of severity — it actively drives neutrophil-mediated tissue damage and systemic inflammation in SAH

Connections

  • HSA — hyperoxidation in acute alcohol-associated hepatitis
  • Oxidation — HNA2 (irreversible Cys34 oxidation) dominant in SAH
  • alcaraz-quiles-2018 — parallel finding in CLD: oxidized albumin (HNA1) triggers cytokine storm in leukocytes via p38 MAPK; Das 2017 is AH-specific with neutrophil focus
  • naldi-2016-ah — structural characterization of HSA in AH; analytical basis for this functional study
  • montomoli-2026-aah — follow-up study; larger AH cohort; survival at 30/90/365 days; uses similar HSA isoform quantification

My notes

  • This is the Indian complement to the European AH albumin studies — ILBS group (Sarin lab, New Delhi) vs Bologna/Aarhus group.
  • The neutrophil activation angle adds a distinct mechanistic layer from alcaraz-quiles-2018 (monocytes/leukocytes → p38 MAPK). Together, both papers show that oxidized albumin activates multiple innate immune cell types.
  • SAH patients in this cohort had 3-month follow-up — this is critical for connecting HSA oxidation state to 90-day mortality (the clinically meaningful endpoint in severe AH).
  • The 52-gene RT-PCR panel showing upregulated TLR signaling and ER stress in SAH neutrophils is a roadmap for understanding the molecular pathways by which hyperoxidized albumin causes harm.
  • AOPP (advanced oxidation protein products) is a simpler spectrophotometric assay that could complement HSA isoform profiling in resource-limited settings.

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