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Streptozotocin and L-Buthionine-Sulfoximine Decrease Neuron Membrane Lipid Packing and Alter Insulin Signaling.

Yandara A Martins1, Camila A E F Cardinali2, Andressa P Costa2

  • 1Departamento de Fisiologia E Biofisica, Universidade de São Paulo, São Paulo, Brazil. yandaraakamine@gmail.com.

Neurotoxicity Research
|May 29, 2025
PubMed
Summary
This summary is machine-generated.

Aging cell membranes contribute to neurodegenerative diseases. Streptozotocin (STZ) and L-buthionine-sulfoximine (BSO) altered membrane composition and insulin signaling in neuro-2a cells, inducing insulin resistance.

Keywords:
Cell membraneCholesterolInsulin signaling pathwaySphingomyelin

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Area of Science:

  • Cell Biology
  • Neuroscience
  • Biochemistry

Background:

  • Cell membrane integrity, composition, and fluidity are crucial for cellular functions.
  • The membrane aging hypothesis posits that aging cell membranes contribute to age-related diseases, including neurodegeneration.
  • Optimal membrane environments are essential for the proper function of membrane proteins like the insulin receptor.

Purpose of the Study:

  • To investigate the impact of streptozotocin (STZ) and L-buthionine-sulfoximine (BSO) on neuronal membrane properties.
  • To assess the effects of STZ and BSO on insulin signaling pathways.
  • To explore the role of membrane alterations in modeling aging and neurodegeneration.

Main Methods:

  • Treatment of mouse neuroblastoma 2a (neuro-2a) cells with STZ and BSO.
  • Assessment of cell viability using MTT assay.
  • Quantification of cholesterol and sphingomyelin content.
  • Evaluation of membrane polarity using the Laurdan probe.
  • Analysis of Srebf2 and Cyp46a1 gene expression via qPCR.
  • Examination of insulin signaling pathway proteins by immunoblotting.

Main Results:

  • STZ treatment decreased neuronal cholesterol, downregulated Srebf2 and Cyp46a1 expression, and reduced membrane packing.
  • BSO treatment increased sphingomyelin content, upregulated Srebf2 and Cyp46a1 expression, and decreased membrane packing.
  • Both STZ and BSO treatments induced an insulin-resistant state in neuro-2a cells.

Conclusions:

  • STZ and BSO significantly alter neuronal membrane composition and permeability.
  • These alterations in membrane environment are linked to the induction of insulin resistance.
  • The study provides insights into the membrane aging hypothesis and its relevance to neurodegeneration models.