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Updated: Sep 6, 2025
Study of Endoplasmic Reticulum and Mitochondria Interactions by In Situ Proximity Ligation Assay in Fixed Cells
Published on: December 10, 2016
The mitochondrial associated endoplasmic reticulum membranes: A platform for the pathogenesis of
Sisay T Degechisa1,2, Yosef T Dabi1,3, Solomon T Gizaw1
1Department of Medical Biochemistry, School of Medicine, College of Health Sciences, Addis Ababa University, Addis Ababa, Ethiopia.
Abstract:
Mitochondria-associated endoplasmic reticulum membranes (MAM) are specialized subcellular compartments that are shaped by endoplasmic reticulum (ER) subdomains placed side by side to the outer membrane of mitochondria (OMM) being connected by tethering proteins in mammalian cells. Studies showed that MAM has multiple physiological functions. These include regulation of lipid synthesis and transport, Ca2+ transport and signaling, mitochondrial dynamics, apoptosis, autophagy, and formation and activation of an inflammasome. However, alterations of MAM integrity lead to deleterious effects due to an increased generation of mitochondrial reactive oxygen species (ROS) via increased Ca2+ transfer from the ER to mitochondria. This, in turn, causes mitochondrial damage and release of mitochondrial components into the cytosol as damage-associated molecular patterns which rapidly activate MAM-resident Nod-like receptor protein-3 (NLRP3) inflammasome components. This complex induces the release of pro-inflammatory cytokines that initiate low-grade chronic inflammation that subsequently causes the development of metabolic diseases. But, the mechanisms of how MAM is involved in the pathogenesis of these diseases are not exhaustively reviewed. Therefore, this review was aimed to highlight the contribution of MAM to a variety of cellular functions and consider its significance pertaining to the pathogenesis of inflammation-mediated metabolic diseases.
Insights
Mitochondria-associated endoplasmic reticulum membranes (MAM) maintain cell functions. Disruptions in MAM integrity cause inflammation and metabolic diseases by activating the NLRP3 inflammasome.
Area of Science:
- Cell Biology
- Mitochondrial Biology
- Metabolic Disease Research
Background:
- Mitochondria-associated endoplasmic reticulum membranes (MAM) are crucial for cellular functions.
- MAM regulates lipid synthesis, calcium signaling, mitochondrial dynamics, and apoptosis.
- MAM integrity is vital; its disruption leads to increased ROS and mitochondrial damage.
Purpose of the Study:
- To review the diverse cellular functions of MAM.
- To elucidate MAM's role in the pathogenesis of inflammation-mediated metabolic diseases.
- To highlight the significance of MAM in cellular health and disease.
Main Methods:
- Literature review of studies on MAM structure and function.
- Analysis of research linking MAM dysfunction to cellular damage and inflammation.
- Synthesis of evidence connecting MAM alterations to metabolic disease development.
Main Results:
- MAM integrity is essential for preventing ROS overproduction and mitochondrial damage.
- Dysfunctional MAM activates the NLRP3 inflammasome, leading to chronic inflammation.
- This chronic inflammation is a key factor in the development of metabolic diseases.
Conclusions:
- MAM plays a critical role in cellular homeostasis and metabolic health.
- Alterations in MAM contribute significantly to the pathogenesis of metabolic diseases.
- Understanding MAM mechanisms is crucial for developing therapeutic strategies for metabolic disorders.
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