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The pathochemistry of kernicterus.

R P Wennberg, C E Ahlfors, L F Rasmussen

Early Human Development

|December 1, 1979

Summary

This summary is machine-generated.

This study proposes a new model for kernicterus pathogenesis, viewing serum albumin and tissues as competitors for bilirubin binding. This competition, driven by unbound bilirubin, explains bilirubin toxicity and informs clinical management of jaundiced infants.

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Area of Science:

Biochemistry
Physiology
Toxicology

Background:

Bilirubin-albumin interaction stoichiometry is well-established, obeying the law of mass action.
Previous studies provide a physicochemical basis for understanding bilirubin transport, cell uptake, and toxicity.
Existing models do not fully explain the pathogenesis of kernicterus.

Purpose of the Study:

To propose a novel model for kernicterus pathogenesis.
To elucidate the competitive binding dynamics between serum albumin and tissues for bilirubin.
To analyze bilirubin transport and toxicity through fundamental chemical principles.

Main Methods:

Analysis of bilirubin-albumin interaction stoichiometry.
Presentation of evidence for reversible bilirubin binding to cellular membranes and enzymes.

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Discussion of bilirubin chemistry, albumin binding, tissue complex formation, and toxicity mechanisms.

Main Results:

Serum albumin and tissues compete for the miscible bilirubin pool.
Unbound bilirubin concentration drives both albumin and tissue binding.
Albumin binding is pH-independent (bilirubin anion), while tissue binding is pH-dependent (bilirubin acid).

Conclusions:

Bilirubin-tissue complex formation inhibits essential cell functions, leading to acidosis, aggregation, and cell death.
The proposed model offers insights into bilirubin transport and toxicity.
This model has implications for the clinical management of jaundiced infants.