Distribution of CD46 and β1 integrin molecules with respect to different membrane structures of the sperm head

0463213 - BTÚ 2017 CZ eng C - Konferenční příspěvek (zahraniční konf.)
Šebková, Nataša - Frolíková, Michaela - Děd, Lukáš - Dvořáková-Hortová, Kateřina
Distribution of CD46 and β1 integrin molecules with respect to different membrane structures of the sperm head.
Programme and Abstract Book. Prague: Czech Society for Cell Biology, z.s, 2016, s. 139-139.
[12th international Congress of Cell Biology. Praha (CZ), 21.07.2016-25.07.2016]
Grant CEP: GA ČR(CZ) GA14-05547S; GA MŠMT(CZ) ED1.1.00/02.0109
Institucionální podpora: RVO:86652036
Klíčová slova: CD46 * β1 integrin * acrosome reaction * latrunculin A * sperm-egg fussion * Proximity ligation assay

CD46 protein plays an important role during fertilization and its role is associated with acrosome stability. CD46 is probably involved in signalling pathways triggering the acrosome reaction (AR). It also associates through membrane integrins with specific MAP kinases involved in the AR. Our aim was to monitor the dynamics of relocation of CD46 and β1 integrin during sperm maturation and its preparation for the fertilization. The dependence of this localization changes on the dynamic of actin cytoskeleton was studied. Our results show the changes in the localization of these proteins associated with the AR and their co-localization was observed using proximity ligation assay. After the AR CD46 and β1 integrin spreads across the sperm head, entering the post-acrosomal compartment, and permeates the borders of different domains. It was shown previously that actin dynamics is necessary for acrosome reaction-associated translocation of Izumo1 protein that is required for sperm-egg fusion. Therefore Latrunculin A was used during sperm incubation. The co-incubation of capacitated sperm with Latrunculin A leads to a decrease of the percentages of sperm, which express relocation pattern after induced AR. 3D models and visualizations of potential membrane processes responsible for the relocation of proteins from the acrosomal area to the other compartments of the sperm head were prepared. Our results deliver new information that proteins CD46 and β1 integrin undergo dynamic relocation towards the sites of sperm-egg fusion during the AR in vitro. The inhibitor of actin dynamics abrogates significantly the AR-associated changes in proteins localization. We speculate that this relocation is of importance for the successful sperm-egg interaction, adhesion and subsequent gamete fusion.
Trvalý link: http://hdl.handle.net/11104/0262857