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Published on: September 23, 2010
Preparation of rat gingival mitochondria with an improved isolation method
Noriaki Kaneko1, Tetsuya Rikimaru, Tetsuyuki Fujimura
1Department of Dental Hygiene, Fukuoka College of Health Sciences, 2-15-1 Tamura, Sawara-Ku, Fukuoka 814-0193, Japan.
Abstract:
In order to establish a method of obtaining rat gingival mitochondria (Mt), Mt fractions were prepared in various combinations of homogenizing time with collagenase concentration. Rat gingival tissues were excised, minced, treated with collagenase, homogenized, and subjected to differential centrifugation rates. Both the respiratory control ratio (RCR) and adenosine diphosphate/oxygen (ADP/O) ratio of the Mt fraction prepared in a combination of 40, 50, or 60 sec homogenization with collagenase in a concentration range of 0.115%-0.130% (w/v) were measured. The values for the RCR and ADP/O ratio of the Mt fraction obtained in an optimal condition was 1.80 ± 0.05 and 1.65 ± 0.03, respectively. These results suggest that Mt of fairly high quality can be obtained through this refined combination of the homogenizing time and collagenase concentration.
Insights
Researchers optimized a method for isolating high-quality rat gingival mitochondria (Mt). The best results were achieved using specific collagenase concentrations and homogenization times, yielding reliable mitochondrial function metrics.
Area of Science:
- Biochemistry
- Cell Biology
- Tissue Engineering
Background:
- Mitochondria are vital organelles responsible for cellular energy production.
- Isolating pure and functional mitochondria from specific tissues like the gingiva is crucial for research.
- Previous methods for obtaining rat gingival mitochondria lacked optimization, potentially affecting experimental outcomes.
Purpose of the Study:
- To establish an optimized protocol for isolating functional mitochondria from rat gingival tissue.
- To determine the ideal combination of collagenase concentration and homogenization time for mitochondrial isolation.
- To assess the quality of isolated mitochondria using respiratory control ratio (RCR) and adenosine diphosphate/oxygen (ADP/O) ratio.
Main Methods:
- Rat gingival tissues were excised, minced, and treated with varying concentrations of collagenase.
- Tissues were homogenized for specific durations (40, 50, or 60 seconds).
- Mitochondrial fractions were isolated using differential centrifugation, and their quality was assessed via RCR and ADP/O ratios.
Main Results:
- Optimal mitochondrial isolation was achieved with collagenase concentrations between 0.115%-0.130% and homogenization times of 40-60 seconds.
- The optimized method yielded a respiratory control ratio (RCR) of 1.80 ± 0.05.
- The adenosine diphosphate/oxygen (ADP/O) ratio under optimal conditions was measured at 1.65 ± 0.03.
Conclusions:
- A refined method combining specific collagenase concentrations and homogenization times allows for the isolation of high-quality rat gingival mitochondria.
- The established protocol provides reliable mitochondrial function metrics (RCR and ADP/O), suitable for further biochemical and cellular studies.
- This optimized isolation technique enhances the potential for accurate research involving rat gingival mitochondria.
