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Interaction of protein- and DNA-loaded liposomes with sperm cells
Abstract:
Liposomes were loaded with fluorescence-labelled serum albumin and their interaction with mouse spermatozoa was examined in a fluorescence microscope. In the presence of polyethylene glycol 1500, fluorescence became unevenly distributed along the entire body of mature spermatozoa, mostly in the form of aggregates, indicating adsorption of liposomes to the surface of the cells. The fluorescence could be largely removed by washing the cells. In the case of immature sperm cells, fluorescence was evenly distributed on the cells and was not removed by extensive washing, suggesting an internalization of the labelled albumin. A more direct evidence for the entrance of liposome-entrapped macromolecules into the immature sperm cells was provided by autoradiography: radioactivity was found in discrete spots in spermatocytes upon their incubation with liposomes containing isotopically labelled DNA.
Insights
Liposomes interact differently with mature and immature mouse sperm cells. Polyethylene glycol causes liposome adsorption to mature sperm, while immature sperm internalize liposome contents, confirmed by DNA uptake studies.
Area of Science:
- Cell Biology
- Biochemistry
- Reproductive Biology
Background:
- Liposomes are crucial drug delivery vehicles.
- Understanding liposome-sperm interactions is vital for reproductive technologies.
Purpose of the Study:
- To investigate the interaction of liposomes with mouse spermatozoa.
- To differentiate liposome interaction mechanisms between mature and immature sperm cells.
Main Methods:
- Fluorescence microscopy to observe liposome-serum albumin interactions with sperm.
- Polyethylene glycol (PEG) 1500 was used to induce liposome adsorption.
- Autoradiography to confirm the internalization of liposome-entrapped macromolecules.
Main Results:
- Liposomes adsorbed to mature spermatozoa in the presence of PEG, removable by washing.
- Immature sperm cells showed even fluorescence distribution, indicating internalization, not removed by washing.
- Autoradiography confirmed uptake of liposome-entrapped DNA into immature spermatocytes.
Conclusions:
- Liposomes exhibit distinct interaction patterns with mature and immature sperm.
- Immature sperm cells are capable of internalizing liposome-encapsulated macromolecules.
- Findings suggest potential for liposome-mediated delivery to immature germ cells.