[The treatment of mitochondrial disorders, present and future]

Yasutoshi Koga1

  • 1Department of Pediatrics and Child Health, Kurume University School of Medicine.

Insights

Developing effective treatments for inherited mitochondrial disorders remains challenging, with limited clinical trial approvals. This review examines current therapeutic drug development, including trials for L-arginine, taurine, and sodium pyruvate.

Area of Science:

  • Biochemistry
  • Genetics
  • Clinical Medicine

Context:

  • Mitochondrial disorders involve inherited multi-system dysfunction affecting major organs.
  • Despite progress in understanding molecular mechanisms, clinical management is primarily supportive.
  • No drug has demonstrated efficacy through rigorous double-blind, randomized, placebo-controlled trials.

Purpose:

  • To review the current landscape of therapeutic drug development for mitochondrial disorders.
  • To analyze data from clinical trial registries.
  • To highlight specific investigator-mediated trials and new drug development projects in Japan.

Summary:

  • This review examines the status of therapeutic drug development for mitochondrial disorders based on clinical trial data.
  • It discusses ongoing trials for L-arginine and taurine in MELAS (Mitochondrial Encephalomyopathy, Lactic Acidosis, and Stroke-like episodes).
  • A new project developing sodium pyruvate for mitochondrial disorder-associated lactic acidosis in Japan is also presented.

Impact:

  • Provides an overview of the challenges and progress in clinical development for mitochondrial disorders.
  • Identifies potential therapeutic avenues and ongoing research efforts.
  • Informs researchers and clinicians about the current state of drug approval and development pipelines.

Related Concept Videos

Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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.
ROS generation is regulated and maintained at moderate levels necessary...
11.9K
Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
7.8K
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,...
13.4K
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,...
11.7K
Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial...
2.9K
Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
4.4K