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Related Concept Videos

Mitochondria01:37

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
Mitochondria01:37

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
Peroxisomes and Mitochondria01:30

Peroxisomes and Mitochondria

Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration—the process that converts energy from food into ATP. Peroxisomes carry out a variety of functions, primarily breaking down different substances, such as fatty acids.
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Mitochondrial Membranes01:45

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 Membranes01:45

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,...
The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...

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Isolation and Functional Analysis of Mitochondria from Cultured Cells and Mouse Tissue
09:27

Isolation and Functional Analysis of Mitochondria from Cultured Cells and Mouse Tissue

Published on: March 23, 2015

Mitochondria and chromaffin cell function.

Javier García-Sancho1, Antonio M G de Diego, Antonio G García

  • 1Instituto de Biología y Genética Molecular (IBGM), Universidad de Valladolid and CSIC, c/Sanz y Forés, 3, 47003, Valladolid, Spain. jgsancho@ibgm.uva.es

Pflugers Archiv : European Journal of Physiology
|January 27, 2012
PubMed
Summary

Chromaffin cells use calcium (Ca2+) signals for secretion. Intracellular organelles like the endoplasmic reticulum and mitochondria refine these signals, optimizing stimulus-secretion coupling for cellular functions.

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Area of Science:

  • Cell biology
  • Neuroscience
  • Biochemistry

Background:

  • Chromaffin cells model stimulus-secretion coupling.
  • Calcium ion (Ca2+) influx via voltage-operated Ca2+ channels (VOCC) initiates secretion.
  • Intracellular organelles modulate Ca2+ signaling dynamics.

Purpose of the Study:

  • To elucidate the roles of the endoplasmic reticulum and mitochondria in Ca2+ signaling during secretion.
  • To understand the formation and function of Ca2+-regulating microdomains.
  • To investigate the contribution of these mechanisms to neuronal function and dysfunction.

Main Methods:

  • Studies on chromaffin cells as a model system.
  • Analysis of Ca2+ dynamics involving VOCC, endoplasmic reticulum, and mitochondria.
  • Investigation of functional triads at the subplasmalemmal region.

Main Results:

  • Endoplasmic reticulum amplifies cytosolic Ca2+ ([Ca2+]C) via Ca2+-induced Ca2+ release (CICR), forming high [Ca2+]C microdomains (HCMD).
  • Mitochondria buffer Ca2+ from HCMD, preventing widespread Ca2+ waves and stimulating respiration.
  • Functional triads of VOCC, CICR sites, and mitochondria optimize secretion and localize Ca2+ signaling.

Conclusions:

  • Subplasmalemmal functional triads precisely regulate Ca2+ signals for efficient stimulus-secretion coupling.
  • Mitochondrial Ca2+ handling is crucial for energy supply and signal termination.
  • Dysfunction in these Ca2+ regulatory mechanisms may underlie neurodegenerative disorders.