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Study of apoptosis in human lymphocytes by toxic substances implicated in toxic oil syndrome

S Gallardo1, B Cárdaba, V del Pozo

  • 1Department of Immunology, Fundación Jiménez Díaz, Madrid, Spain.

Toxicology
|March 14, 1997
PubMed

Insights

Toxic Oil Syndrome (TOS) is a severe disease linked to contaminated rapeseed oil. Research shows a specific oil ester, di-oleyl ester of 3-(N-phenylamino)-1,2-propanediol, triggers lymphocyte apoptosis, a key cell death pathway in TOS.

Area of Science:

  • Immunology
  • Toxicology
  • Pathogenesis of Multisystemic Diseases

Background:

  • Toxic Oil Syndrome (TOS) is a devastating multisystemic illness that emerged in Spain in 1981, primarily caused by ingesting aniline-denatured rapeseed oil.
  • Accumulating evidence suggests a significant role for T cells in the pathological mechanisms underlying TOS.

Purpose of the Study:

  • To investigate the cytotoxic mechanisms of TOS-related compounds on human lymphocytes.
  • To evaluate the potential of aniline, 3-(N-phenylamino)-1,2-propanediol, its mono- and di-oleyl esters, and the eosinophilia myalgia-related compound 3-(phenylamino)-L-alanine in inducing lymphocyte apoptosis.

Main Methods:

  • Human lymphocytes were exposed to various TOS-related products, including aniline derivatives and an eosinophilia myalgia-related compound.
  • Apoptosis induction was assessed through morphological changes, phosphatidylserine externalization assays, and DNA degradation analysis.

Main Results:

  • Only the di-oleyl ester of 3-(N-phenylamino)-1,2-propanediol demonstrated significant induction of apoptosis in human lymphocytes.
  • This apoptotic effect was concentration-dependent and time-dependent.
  • Confirmation of apoptosis was established via morphological examination, membrane phosphatidylserine expression, and DNA fragmentation analysis.

Conclusions:

  • The di-oleyl ester of 3-(N-phenylamino)-1,2-propanediol is identified as a specific inducer of lymphocyte apoptosis in the context of Toxic Oil Syndrome.
  • These findings highlight a potential mechanism by which TOS-related contaminants may contribute to the immunopathology of the disease.

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