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Gap Junctions

Gap Junctions

Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...

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Related Experiment Video

Updated: Oct 4, 2025

Sex Differences in Mouse Hippocampal Astrocytes after In-Vitro Ischemia

Sex Differences in Mouse Hippocampal Astrocytes after In-Vitro Ischemia

Published on: October 25, 2016

Does astrocyte gap junction protein expression differ during development in absence epileptic rats?

Büşra Köse¹, Mazhar Özkan², İlknur Sur-Erdem³

¹Department of Anatomy, School of Medicine, Koç University, Istanbul, Turkey.

Synapse (New York, N.Y.)

|February 9, 2022

Summary

This summary is machine-generated.

Astrocytic connexin 30 (Cx30) expression in the brains of absence epilepsy rats (GAERS) shows a continuous increase, unlike in control rats, suggesting a role in epilepsy development.

Keywords:

absence epilepsy connexin 30 developmental gap junction proteins

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A Model of Epileptogenesis in Rhinal Cortex-Hippocampus Organotypic Slice Cultures

A Model of Epileptogenesis in Rhinal Cortex-Hippocampus Organotypic Slice Cultures

Published on: March 18, 2021

Area of Science:

Neuroscience
Cellular Biology
Epilepsy Research

Background:

Gap junctions (GJs) mediate intercellular communication crucial for central nervous system (CNS) functions.
Astrocytic GJs, particularly involving connexin 30 (Cx30), play a significant role in brain development and function.
Understanding Cx30 developmental expression is vital for comprehending neurological disorders like absence epilepsy.

Purpose of the Study:

To quantify astrocytic connexin 30 (Cx30) expression during development in the genetic model of absence epilepsy rats from Strasbourg (GAERS).
To compare Cx30 expression patterns in epileptic rats with control Wistar rats in key brain regions of the cortico-thalamic circuit.
To investigate the potential relationship between altered Cx30 developmental expression and the pathogenesis of absence epilepsy.

Main Methods:

Developmental study using immunohistochemistry to quantify Cx30-immunopositive astrocytes in the somatosensory cortex (SSCx), ventrobasal (VB), and lateral geniculate (LGN) thalamic nuclei.
Western blotting was employed to assess Cx30 protein levels in tissue samples from the same brain regions.
Animals were studied at postnatal days P10, P30, and P60, comparing GAERS with Wistar rats.

Main Results:

Cx30 was detected in all studied regions (SSCx, VB, LGN) at P10 in both Wistar and GAERS rats.
Wistar rats exhibited a progressive increase in Cx30-positive astrocytes from P10 to P30, followed by a decline at P60 in SSCx and VB.
GAERS rats showed a continuous, progressive increase in Cx30-positive astrocytes from P10 to P60 across all studied brain regions, consistent with western blot data.

Conclusions:

The developmental expression pattern of Cx30 in the epileptic focal areas of GAERS is distinct from that of Wistar rats.
Disproportional developmental expression of Cx30 in GAERS may be implicated in the onset of absence seizures.
Altered Cx30 neurogenesis in GAERS could be a contributing factor to the development of absence epilepsy.