Mitochondrial deformity confined to a single cardiomyocyte in human endomyocardial biopsy specimens: Report of 4 cases

Genzou Takemura, Hiromitsu Kanamori, Hideshi Okada, Akiko Tsujimoto, Nagisa Miyazaki, Shusaku Miyata, Hideaki Ohta, Yoshiaki Kawase, Makoto Ono, Mamoru Mochizuki, Shigeki Kobayashi, Kenji Onoue, Tomoya Nakano, Yasuhiro Sakaguchi, Hitoshi Matsuo, Masafumi Yano, Yoshihiko Saito

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

During electron microscopic examination of 156 consecutive human endomyocardial biopsy specimens, we found marked mitochondrial deformity within a single cardiomyocyte in each of 4 specimens. The deformed mitochondria were unevenly distributed, but the deformities were confined to the one cardiomyocyte. Those affected cardiomyocytes were accompanied by nonspecific degenerative changes such as nuclear hypertrophy and/or rarefaction of the myofibrils. Mitochondria in all other cells within the specimens appeared normal. Such an abnormality has never been reported to date. Each of the four cases was diagnosed with a different ailment: post-myocarditis, dilated cardiomyopathy, amyloidosis, and tachycardia-induced heart failure. However, all four cases were accompanied by left ventricular systolic dysfunction at biopsy. The very limited mitochondrial deformation may thus reflect a type of degenerative change that accompanies heart failure. <Learning objective: A marked mitochondrial deformity must have been overlooked to date, which is confined to a single cardiomyocyte in an endomyocardial biopsy specimen. Its etiology is still unknown but may reflect a type of degenerative change that accompanies heart failure.>

Original languageEnglish
Pages (from-to)178-182
Number of pages5
JournalJournal of Cardiology Cases
Volume16
Issue number5
DOIs
Publication statusPublished - 11-2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Cardiology and Cardiovascular Medicine

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