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IHG-1 increases mitochondrial fusion and bioenergetic function.

Fionnuala B Hickey1, James B Corcoran2, Brenda Griffin3

  • 1Diabetes Complications Research Centre, Conway Institute, University College Dublin, Belfield, Dublin, Ireland School of Medicine and Medical Sciences, University College Dublin, Belfield, Dublin, Ireland Trinity Health Kidney Centre, Trinity College, Dublin, Ireland.

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Induced in high glucose-1 (IHG-1) protein regulates mitochondrial function and cell survival. IHG-1 enhances mitochondrial fusion and protects against oxidative stress, impacting diabetic kidney disease progression.

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Area of Science:

  • Mitochondrial biology
  • Cellular bioenergetics
  • Diabetic nephropathy pathogenesis

Background:

  • Induced in high glucose-1 (IHG-1) is a mitochondrial protein implicated in diabetic nephropathy (DN).
  • IHG-1 amplifies transforming growth factor (TGF)-β1 signaling and increases mitochondrial biogenesis.
  • Its precise role in mitochondrial dynamics and cell survival is not fully understood.

Purpose of the Study:

  • To elucidate the function of IHG-1 in mitochondrial dynamics, bioenergetics, and cell survival.
  • To investigate the interaction of IHG-1 with mitochondrial fusion proteins.
  • To determine the role of IHG-1 in the context of diabetic kidney disease.

Main Methods:

  • Inhibition and overexpression of IHG-1 in cellular models.
  • Assessment of mitochondrial respiratory capacity, ATP production, and mitochondrial fusion.
  • Co-immunoprecipitation to study protein-protein interactions.
  • Analysis of cell viability under oxidative stress conditions.

Main Results:

  • IHG-1 inhibition reduced mitochondrial respiration, ATP production, and fusion.
  • IHG-1 overexpression increased mitochondrial fusion and protected against reactive oxygen species-induced apoptosis.
  • IHG-1 forms complexes with mitofusins (Mfns) 1 and 2, enhancing Mfn2 GTP-binding.
  • Mitochondrial localization of IHG-1 is essential for its interaction with Mfns and promotion of fusion.

Conclusions:

  • IHG-1 is a novel regulator of mitochondrial dynamics and bioenergetic function.
  • IHG-1 promotes cell survival during oxidant stress.
  • In diabetic kidney disease, increased IHG-1 may protect cell viability and enhance TGF-β actions, contributing to renal proximal tubule dedifferentiation.