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Mitochondrial dysfunction in sepsis is associated with diminished intramitochondrial TFAM despite its increased cellular expression.


ABSTRACT: Sepsis is characterized by a dysregulated immune response, metabolic derangements and bioenergetic failure. These alterations are closely associated with a profound and persisting mitochondrial dysfunction. This however occurs despite increased expression of the nuclear-encoded transcription factor A (TFAM) that normally supports mitochondrial biogenesis and functional recovery. Since this paradox may relate to an altered intracellular distribution of TFAM in sepsis, we tested the hypothesis that enhanced extramitochondrial TFAM expression does not translate into increased intramitochondrial TFAM abundance. Accordingly, we prospectively analyzed PBMCs both from septic patients (n?=?10) and lipopolysaccharide stimulated PBMCs from healthy volunteers (n?=?20). Extramitochondrial TFAM protein expression in sepsis patients was 1.8-fold greater compared to controls (p?=?0.001), whereas intramitochondrial TFAM abundance was approximate 80% less (p?

SUBMITTER: Rahmel T 

PROVIDER: S-EPMC7713186 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature

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Mitochondrial dysfunction in sepsis is associated with diminished intramitochondrial TFAM despite its increased cellular expression.

Rahmel Tim T   Marko Britta B   Nowak Hartmuth H   Bergmann Lars L   Thon Patrick P   Rump Katharina K   Kreimendahl Sebastian S   Rassow Joachim J   Peters Jürgen J   Singer Mervyn M   Adamzik Michael M   Koos Björn B  

Scientific reports 20201203 1


Sepsis is characterized by a dysregulated immune response, metabolic derangements and bioenergetic failure. These alterations are closely associated with a profound and persisting mitochondrial dysfunction. This however occurs despite increased expression of the nuclear-encoded transcription factor A (TFAM) that normally supports mitochondrial biogenesis and functional recovery. Since this paradox may relate to an altered intracellular distribution of TFAM in sepsis, we tested the hypothesis tha  ...[more]

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