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Biologists make living sperm glow

Date:
January 15, 2020
Source:
Technische Universität Dresden
Summary:
By applying a novel method, biologists have successfully analyzed the metabolism of intact tissues of the fruit fly using a label-free microscopy technique. They used the natural fluorescence of certain metabolic molecules and found that sperm, compared to other tissues, are highly glycolytic.
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How do female insects manage to keep the sperm fresh for months after mating? This is a central question of the sperm biologists of the Chair of Applied Zoology headed by Prof. Dr. Klaus Reinhardt. Now the scientists presented their first promising results in the journal Scientific Reports.

Dr. Cornelia Wetzker borrowed an innovative label-free technique from cancer research in order to investigate the metabolism of living biological tissues. This involves the measurement of the decay of the intrinsic fluorescence of the metabolic coenzyme NADH -- a matter of nanoseconds, requiring a specialised microscope. This measure, also known as fluorescence lifetime, serves as a cell-specific signature and characterises the specific metabolic pathways of the tissue. Cancer cells have a shorter NADH fluorescence lifetime, are thus more glycolytic and can therefore be distinguished from healthy cells.

With this method, Dr. Cornelia Wetzker has now succeeded in examining the metabolism of intact tissues of the fruit fly outside the body. She analysed the metabolism of sperm in the storage organs of male and female animals as well as other tissues of the insect. The sperm were investigated in still intact closed organs, which in the male serve for storage before and in the females after mating. The team thus found that the sperm had a highly glycolytic metabolism similar to that of cancer cells. Other cells, such as intestinal, gland and fat cells, were in a much more oxidative state.

Using this method, the biologists found a first clue to their initial question of how the sperm remain fresh in the body of the insect females. They discovered that the fluorescence lifetime of another autofluorescent metabolic coenzyme called FAD differs between the sperm in the male and in the female body.

With regard to the clinical application of this technique, fluorescence lifetime imaging microscopy (FLIM) is proving to be highly promising. "The fluorescence lifetime signature analysis could even be automated with the help of neural networks," suspects Dr. Cornelia Wetzker. "And since the method is not dangerous, there is no reason why it should not be used on living humans or animals," adds Professor Klaus Reinhardt.


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Materials provided by Technische Universität Dresden. Note: Content may be edited for style and length.


Journal Reference:

  1. Cornelia Wetzker, Klaus Reinhardt. Distinct metabolic profiles in Drosophila sperm and somatic tissues revealed by two-photon NAD(P)H and FAD autofluorescence lifetime imaging. Scientific Reports, 2019; 9 (1) DOI: 10.1038/s41598-019-56067-w

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Technische Universität Dresden. "Biologists make living sperm glow." ScienceDaily. ScienceDaily, 15 January 2020. <www.sciencedaily.com/releases/2020/01/200115120622.htm>.
Technische Universität Dresden. (2020, January 15). Biologists make living sperm glow. ScienceDaily. Retrieved May 20, 2024 from www.sciencedaily.com/releases/2020/01/200115120622.htm
Technische Universität Dresden. "Biologists make living sperm glow." ScienceDaily. www.sciencedaily.com/releases/2020/01/200115120622.htm (accessed May 20, 2024).

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