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Related Experiment Videos

Long-term and short-term changes in mitochondrial parameters by thyroid hormones

S Soboll1

  • 1Institut für Physiologische Chemie I, Universität Düsseldorf, Germany.

Biochemical Society Transactions
|August 1, 1993
PubMed
Summary

Thyroid hormones (THs) increase liver cell energy output by enhancing the proton motive force (delta p). Calcium influx, mediated by T3, appears to be the key mechanism behind these metabolic shifts.

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Area of Science:

  • Biochemistry
  • Endocrinology
  • Cellular Physiology

Background:

  • Hyperthyroidism significantly alters cellular energy metabolism in rat liver.
  • Thyroid hormones (THs) are known to influence mitochondrial function and adenine nucleotide distribution.

Purpose of the Study:

  • To investigate the role of mitochondrial membrane potential (delta psi m) and proton gradient (delta pHm) in mediating TH-induced metabolic changes.
  • To explore the involvement of intracellular calcium as a signaling molecule in TH action.

Main Methods:

  • Measurement of mitochondrial membrane potential (delta psi m), delta pHm, and proton motive force (delta p) in rat liver under different thyroid states.
  • Analysis of subcellular adenine nucleotide distribution.
  • Assessment of calcium influx and its correlation with respiration and gluconeogenesis.

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Main Results:

  • Hyperthyroidism increases delta psi m, delta pHm, and delta p in rat liver, indicating enhanced energy output.
  • Changes in adenine nucleotide distribution do not solely correlate with delta psi m, suggesting other factors mediate TH effects on adenine nucleotide transport.
  • T3 rapidly induces calcium influx, which parallels increases in respiration and gluconeogenesis, implicating calcium as a mediator.

Conclusions:

  • Mitochondrial membrane potential and proton gradient changes are influenced by THs but do not fully explain the stimulation of adenine nucleotide transport.
  • Calcium influx is a critical, rapid mediator of T3-induced metabolic effects, similar to glucagon and vasopressin.
  • The specific increase in delta p with T3 treatment, compared to other hormones, is linked to distinct mechanisms of intracellular calcium enhancement.