[Searching for the Causes of Bipolar Disorder: Mitochondrial Dysfunction Hypothesis and Beyond].
Level 5 - mechanism / opinion, no new human data
Narrative review of preclinical animal models and mechanistic hypotheses without new human clinical data
PubMed 33824223 · doi:10.11477/mf.1416201769
What was done
The authors summarized findings from their research program evaluating the mitochondrial dysfunction hypothesis of bipolar disorder. The reviewed studies assessed mitochondrial DNA (mtDNA) polymorphisms and intracellular calcium signaling, analyzed transgenic mice with brain mtDNA mutations (mutant Polg transgenic mice), identified brain regions with high mutant mtDNA accumulation, and examined the effects of neural circuit manipulation in targeted brain regions.
What was found
The abstract reports no numerical data, sample sizes, or effect sizes. Qualitatively, mtDNA polymorphisms altered mitochondrial Ca2+ concentration, Ca2+ uptake, and intracellular Ca2+ signaling. Mutant Polg transgenic mice exhibited spontaneous repetitive depressive episodes. Mutant mtDNA accumulated most abundantly in the paraventricular nucleus of the thalamus (PVT), and neural circuit manipulation of the PVT caused similar repetitive hypoactive episodes in mice.
Why it matters
This work links cellular mitochondrial calcium dysregulation to a specific thalamic circuit (the paraventricular nucleus of the thalamus) as a candidate neural substrate for cyclic mood episodes in bipolar disorder.
Limits
The abstract contains no human clinical data, sample sizes, or quantitative statistical values. Findings rely heavily on transgenic mouse models and circuit manipulation, which cannot directly establish etiology or clinical generalizability in human bipolar disorder.
Cited by
- supports Tadafumi Kato published research linking mitochondrial dysfunction to the pathophysiology of bipolar disorder.