Abstract
Cryopreservation of kangaroo sperm has not been successful so far, and yet there is no promising cryopreservation protocol for these cells available. However, conservation of gametes is extremely important, particularly in the context of preserving endangered species. As spermatozoa are comprised of different membrane systems, the composition of these membranes might account for difficulties in cryopreservation. Lipids, as the main components, affect the physical properties of biological membranes and play a major role in sperm maturation. Therefore, knowledge of the lipid composition is crucial for any further step toward the preservation of the species. We used MALDI-TOF, ESI-IT, tandem mass spectrometry, and thin layer chromatography to investigate the lipid composition of epididymal spermatozoa of four different kangaroo species. Spectra of these species were very similar with respect to the identified lipid species. Tremendous changes in the lipid composition during the transit of sperm from caput to cauda epididymis could be seen, specifically an increase in poly-unsaturated fatty acids, ether lipids, and plasmalogens, as well as a reduction in mono- and di-unsaturated fatty acids. Additionally, phosphatidylcholines containing docosatrienoic acid (22:3), a heretofore unknown fatty acid for sperm membranes, showed the highest abundance in kangaroo sperm.
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Abbreviations
- CerPCho:
-
Sphingomyelin
- CID:
-
Collision-induced dissociation
- DHB:
-
2,5-Dihydroxybenzoic acid
- DMA:
-
Dimethylacetamide
- ESI-IT MS:
-
Electrospray ionization ion trap mass spectrometry
- FAME:
-
Fatty acid methyl esters
- GC:
-
Gas chromatography
- HPTLC:
-
High-performance thin-layer chromatography
- MALDI-TOF MS:
-
Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry
- MS/MS:
-
Tandem mass spectrometry
- n-3/-6/-9:
-
Omega-3/-6/-9 fatty acid
- PBS:
-
Phosphate-buffered saline
- PLA2 :
-
Phospholipase A2
- PakCho:
-
1-O-Alkyl-2-acyl-sn-glycero-3-phosphocholine
- PlsCho:
-
1-O-Alkenyl-2-acyl-sn-glycero-3-phosphocholine
- PtdCho:
-
1,2-Diacyl-sn-glycero-3-phosphocholine
- PakEtn:
-
1-O-Alkyl-2-acyl-sn-glycero-3-phosphoethanolamine
- PtdEtn:
-
1,2-Diacyl-sn-glycero-3-phosphoethanolamine
- PtdIns:
-
1,2-Diacyl-sn-glycero-3-phosphoinositol
- ROS:
-
Reactive oxygen species
- TLC:
-
Thin-layer chromatography
- UV:
-
Ultraviolet
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Acknowledgements
The authors would like to thank Dr. Gudrun Wibbelt for the necropsy of the analyzed animals and the provision of kangaroo testes and epididymides and Christiane Franz for technical assistance. This work was supported by the German Research Council (DFG Schi 476/12-2, DFG Schi 476/16-1, DFG MU 1520/4-2 and SFB 1052/Z3).
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Conception and design, Analysis and interpretation of the data, Drafting of the article, Critical revision of the article for important intellectual content, Final approval of the article: KME, UJ, KM, JS.
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Engel, K.M., Schiller, J., Müller, K. et al. The Phospholipid Composition of Kangaroo Spermatozoa Verified by Mass Spectrometric Lipid Analysis. Lipids 52, 857–869 (2017). https://doi.org/10.1007/s11745-017-4283-9
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DOI: https://doi.org/10.1007/s11745-017-4283-9