Mitochondria-ER crosstalk via MAMS: Bridging cellular homeostasis and cancer progression

Mitochondria-associated endoplasmic reticulum membranes (MAMs) are dynamic contact points between the endoplasmic reticulum (ER) and mitochondria, governing essential cellular processes such as calcium (Ca²⁺) signaling, lipid metabolism, mitochondrial dynamics, and apoptosis. The effective movement of Ca²⁺ from the ER to mitochondria at MAMs is crucial for sustaining bioenergetics and controlling cell fate outcomes like survival or programmed cell death. Recent findings highlight the importance of MAMs in maintaining cellular balance and demonstrate their functional versatility in both healthy and diseased states. Disruption of MAM integrity and signaling is increasingly linked to the development of various diseases, including cancer. In cancer, MAMs demonstrate two regulatory roles- either promoting oncogenic functions or enhancing tumor-suppressive actions based on the molecular context and cellular environment. Changes in the structural framework of MAMs, such as variations in protein makeup and tethering distance between the ER and mitochondria, have been directly linked to several characteristics of tumor formation. Therefore, a deeper understanding of the molecular components and regulatory mechanisms governing MAM function may offer a promising avenue for the development of novel therapeutic strategies aimed at restoring proper organelle communication and counteracting cancer development and progression.