Mechanisms Underlying the Essential Role of Mitochondrial Membrane Lipids in Yeast Chronological Aging

Overview

Journal Oxid Med Cell Longev

Publisher Wiley

Specialties Cell Biology
Endocrinology

Date 2017 Jun 9

PMID 28593023

Citations 10

Authors

Younes Medkour

Pamela Dakik

Melissa McAuley

Karamat Mohammad

Darya Mitrofanova

Vladimir I Titorenko

Affiliations

Soon will be listed here.

Abstract

The functional state of mitochondria is vital to cellular and organismal aging in eukaryotes across phyla. Studies in the yeast have provided evidence that age-related changes in some aspects of mitochondrial functionality can create certain molecular signals. These signals can then define the rate of cellular aging by altering unidirectional and bidirectional communications between mitochondria and other organelles. Several aspects of mitochondrial functionality are known to impact the replicative and/or chronological modes of yeast aging. They include mitochondrial electron transport, membrane potential, reactive oxygen species, and protein synthesis and proteostasis, as well as mitochondrial synthesis of iron-sulfur clusters, amino acids, and NADPH. Our recent findings have revealed that the composition of mitochondrial membrane lipids is one of the key aspects of mitochondrial functionality affecting yeast chronological aging. We demonstrated that exogenously added lithocholic bile acid can delay chronological aging in yeast because it elicits specific changes in mitochondrial membrane lipids. These changes allow mitochondria to operate as signaling platforms that delay yeast chronological aging by orchestrating an institution and maintenance of a distinct cellular pattern. In this review, we discuss molecular and cellular mechanisms underlying the essential role of mitochondrial membrane lipids in yeast chronological aging.

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