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Mitochondrial Membranes

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...

Mitochondrial Membranes

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...

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Updated: Jul 2, 2026

Use of a Caspase Multiplexing Assay to Determine Apoptosis in a Hypothalamic Cell Model

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Published on: April 16, 2014

Palmitate Compromises C6 Astrocytic Cell Viability and Mitochondrial Function.

Luisa O Schmitt^1,2, Antonella Blanco^3,4, Sheila V Lima¹

¹Laboratory of Neuroimmune-Metabolism, Federal University of Santa Catarina, Florianópolis 88037-000, Brazil.

|March 27, 2024

Summary

This summary is machine-generated.

High-fat diets can harm brain cells. Palmitate, a saturated fatty acid, impairs astrocyte mitochondrial function and reduces cell viability, contributing to brain dysfunction.

Keywords:

astrocytes inflammation mitochondria obesity saturated fatty acids

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Area of Science:

Neuroscience
Cell Biology
Biochemistry

Background:

High-fat diets (HFD) are linked to cognitive decline and dementia.
Astrocytes are implicated in HFD-induced neuroinflammation and brain dysfunction.
The precise mechanisms by which saturated fatty acids affect astrocytes remain unclear.

Purpose of the Study:

To investigate the effects of saturated fatty acids on astrocyte viability and mitochondrial function.
To determine if palmitate or stearate exposure compromises astrocyte health.
To elucidate the role of astrocytes and mitochondrial dysfunction in obesity-related brain issues.

Main Methods:

Exposing the C6 astrocyte cell line to palmitate or stearate (200 µM and 400 µM) for 6 hours.
Assessing cell viability, morphology, inflammatory markers (TNF-α, IL6), and oxidative stress.
Measuring mitochondrial parameters including membrane potential, mass, respiration, and complex activities.

Main Results:

Palmitate exposure (400 µM) reduced astrocyte viability and altered morphology (200 µM).
Palmitate increased inflammatory markers but did not induce oxidative stress.
Mitochondrial membrane potential and mass significantly decreased; Complex I activity was reduced, while respiration remained unchanged.

Conclusions:

Palmitate, a saturated fatty acid, induces inflammation and impairs astrocyte mitochondrial function.
These impairments lead to reduced astrocytic cell viability and morphological changes.
The findings offer insights into saturated fatty acid, astrocyte, and mitochondrial interactions in obesity-related brain dysfunction.