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Related Concept Videos

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Mitochondria

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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,...
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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,...
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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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Related Experiment Video

Updated: Jul 13, 2025

Measuring Mitochondrial Function of Naïve and Effector CD8 T Cells
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Published on: March 28, 2025

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STAT3 modulates CD4+ T mitochondrial dynamics and function in aging.

Emelia Zukowski1, Marco Sannella1, Jack Donato Rockhold1

  • 1Department of Nutrition and Public Health, Merrimack College, North Andover, Massachusetts, USA.

Aging Cell
|October 14, 2023
PubMed
Summary
This summary is machine-generated.

Aging increases mitochondrial STAT3 in T cells, impairing function and cytokine production. Inhibiting this mitochondrial STAT3 (mitoSTAT3) restores mitochondrial dynamics and reduces inflammation, revealing a key aging mechanism.

Keywords:
CD4+ T cellsTh17 cytokinesagingcytokinesinflammagingmitochondriamitochondrial STAT3naïve CD4+ T cells

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Area of Science:

  • Immunology
  • Cellular Aging
  • Mitochondrial Biology

Background:

  • T cell effector function declines with age.
  • Aging is associated with intracellular changes in T cells.
  • Mitochondrial dysfunction is implicated in T cell aging.

Purpose of the Study:

  • To investigate the role of STAT3 localization in aging T cells.
  • To elucidate the impact of mitochondrial STAT3 (mitoSTAT3) on T cell function.
  • To explore therapeutic strategies targeting mitoSTAT3.

Main Methods:

  • Assessed STAT3 localization in T cells from young and old adults.
  • Utilized a mitochondria-targeted STAT3 inhibitor (Mtcur-1).
  • Analyzed mitochondrial dynamics, function, and cytokine production.
  • Expressed constitutively active STAT3 in T cells from young adults.

Main Results:

  • Aging increases STAT3 localization to mitochondria (mitoSTAT3).
  • mitoSTAT3 enhances mitochondrial complex II activity, altering dynamics and function.
  • Inhibition of mitoSTAT3 with Mtcur-1 reversed age-induced mitochondrial changes and reduced Th17 inflammation.
  • Constitutive STAT3 activation in young T cells mimicked aging-related mitochondrial and cytokine profiles.

Conclusions:

  • mitoSTAT3 is a key mediator of age-related T cell dysfunction.
  • Targeting mitoSTAT3 can restore mitochondrial function and T cell homeostasis.
  • This study reveals a novel mechanism linking mitochondrial dynamics, STAT3, and T cell aging.