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Role of Cholesterol, DOTAP, and DPPC in Prostasome/Spermatozoa Interaction and Fusion

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Abstract

Prostasomes are membranous vesicles present in ejaculated human semen. They are very rich in cholesterol and can interact with spermatozoa. Their physiological roles are still under study. Prostasomes were mixed with liposomes prepared from various lipids, such as N-[1-(2,3-dioleoyloxy)propyl]-N,N,N-trimethylammonium (DOTAP), DOTAP/1,2-dipalmytoyl-sn-glycero-3-phosphorylcholine (DPPC, 4:1 molar ratio) and DOTAP/cholesterol (4:1, molar ratio) at different pH values (5–8). The mixing of the lipid phases (fusion) was determined by the relief of octadecyl rhodamine B chloride (R18) self-quenching and the radii of the vesicles, by light scattering measurements. The mixing of lipids and the radii of prostasomes were both influenced by the addition of liposome, although in a different manner. The ability of prostasomes (modified by previous treatment with liposomes) to transfer lipid to spermatozoa was also measured. Pretreatment with DOTAP decreased the phenomenon and addition of DPPC abolished it. On the other hand, pretreatment of prostasomes with DOTAP/cholesterol liposomes did not affect the transfer of lipid between prostasome and spermatozoa. Therefore, the ability of vesicles to fuse (or, at least, to exchange the lipid component) was affected by the enrichment in either natural or artificial lipid. This may open new possibilities for the modulation of spermatozoa capacitation and acrosome reaction.

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Authors and Affiliations

  1. Department of Internal Medicine, Laboratory of Biochemistry, University of Perugia, Via del Giochetto, I-06122, Perugia, Italy

    Carlo A. Palmerini, Enrico Carlini & Giuseppe Arienti

  2. Department of Physics, University of Rome “La Sapienza” and National Institute for the Physics of Matter–Unity Rome 1, Piazza A. Moro, 06000, Roma, Italy

    Cesare Cametti, Simona Sennato, Diego Gaudino & Federico Bordi

Authors
  1. Carlo A. Palmerini
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  2. Cesare Cametti
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  3. Simona Sennato
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  4. Diego Gaudino
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  5. Enrico Carlini
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  6. Federico Bordi
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  7. Giuseppe Arienti
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Correspondence to Giuseppe Arienti.

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Palmerini, C.A., Cametti, C., Sennato, S. et al. Role of Cholesterol, DOTAP, and DPPC in Prostasome/Spermatozoa Interaction and Fusion. J Membrane Biol 211, 185–190 (2006). https://doi.org/10.1007/s00232-006-0009-2

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  • DOI: https://doi.org/10.1007/s00232-006-0009-2

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