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Updated: Mar 1, 2026
Author Spotlight: Transmitochondrial Cybrid Generation Using Cancer Cell Lines
Published on: March 17, 2023
Prevalence of somatic mitochondrial mutations and spatial distribution of mitochondria in non-small cell lung cancer
Daniel Kazdal1, Alexander Harms1, Volker Endris1
1Institute of Pathology, Heidelberg University, 69120 Heidelberg Germany.
Background:
Mitochondria are considered relevant players in many tumour entities and first data indicate beneficial effects of mitochondria-targeted antioxidants in both cancer prevention and anticancer therapies. To further dissect the potential roles of mitochondria in NSCLC we comprehensively analysed somatic mitochondrial mutations, determined the spatial distribution of mitochondrial DNA within complete tumour sections and investigated the mitochondrial load in a large-scale approach.
Methods:
Whole mitochondrial genome sequencing of 26 matched tumour and non-neoplastic tissue samples extended by reviewing published data of 326 cases. Systematical stepwise real-time PCR quantification of mitochondrial DNA covering 16 whole surgical tumour sections. Immunohistochemical determination of the mitochondrial load in 171 adenocarcinoma and 145 squamous cell carcinoma.
Results:
Our results demonstrate very low recurrences (max. 1.7%) and a broad distribution of 456 different somatic mitochondrial mutations. Large inter- and intra-tumour heterogeneity were seen for mitochondrial DNA copy numbers in conjunction with a correlation to the predominant histological growth pattern. Furthermore, tumour cells had significantly higher mitochondrial level compared to adjacent stroma, whereas differences between tumour entities were negligible.
Conclusions:
Non-evident somatic mitochondrial mutations and highly varying mitochondrial DNA level delineate challenges for the approach of mitochondria-targeted anticancer therapies in NSCLC.
Insights
Mitochondria play a role in non-small cell lung cancer (NSCLC). Despite low mutation rates, varying mitochondrial DNA levels present challenges for mitochondria-targeted cancer therapies.
Area of Science:
- Mitochondrial genomics
- Cancer biology
- Non-small cell lung cancer (NSCLC) research
Background:
- Mitochondria are implicated in various cancers.
- Mitochondria-targeted antioxidants show promise in cancer prevention and therapy.
- Understanding mitochondrial roles in NSCLC is crucial.
Purpose of the Study:
- To analyze somatic mitochondrial mutations in NSCLC.
- To determine mitochondrial DNA distribution in NSCLC.
- To investigate mitochondrial load in NSCLC.
Main Methods:
- Whole mitochondrial genome sequencing of 26 NSCLC samples.
- Mitochondrial DNA quantification via real-time PCR in 16 tumor sections.
- Immunohistochemical analysis of mitochondrial load in 316 NSCLC cases.
Main Results:
- Low recurrence of somatic mitochondrial mutations (max. 1.7%) with 456 distinct mutations found.
- Significant inter- and intra-tumor heterogeneity in mitochondrial DNA copy numbers.
- Tumor cells exhibit higher mitochondrial levels than adjacent stroma.
Conclusions:
- Somatic mitochondrial mutations in NSCLC are infrequent.
- Highly variable mitochondrial DNA levels pose challenges for mitochondria-targeted therapies.
- Further research is needed to overcome these challenges in NSCLC treatment.
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