Human gamete fusion can bypass β1 integrin requirement

Since α6β1 integrin has been shown to function as a sperm adhesion receptor in the mouse, we investigated the potential role of β1 integrin in the gamete fusion process in humans. The expression of β1 integrin was morphologically analysed by indirect immunofluorescence and confocal microscopy. A homogeneous and intense staining was detected at the plasma membrane, and in some subcortical vesicles of germinal vesicle stage oocytes (GV). β1 almost disappeared from oolemma and cytoplasm of metaphase I (MI) oocytes, but was re-expressed as asymmetrical patches at the plasma membrane of metaphase II stage oocytes (MII). A functional fusion assay based on Hoechst or calcein-AM dye transfer from one gamete to the other showed that maturing oocytes were able to fuse with an increasing number of spermatozoa (11–22 from GV to MII respectively), and that fused spermatozoa co-localized with β1 integrin patches. Human gamete fusion was only partially inhibited either by RGD-containing peptide (GRGDTP), or by blocking anti-human β1 integrin monoclonal antibody (DE9), with a maximum of 50% inhibition. Despite the combined addition of GRGDTP and blocking mouse anti-human β1 integrin DE9 in the assay, a complete inhibition of fusion could not be achieved. A mouse polyclonal antibody raised against human oocyte membranes was more potent in inhibiting the fusion. Since β1 integrin expression at the plasma membrane was not correlated to oocyte fusibility, and since it was only partially inhibited by DE9 and/or RGD peptide, we suggest that human gamete fusion can bypass the β1 requirement. β1 integrin certainly participates in human gamete fusion by acting in co-operation with multiple integrin/disintegrin couples or another cofactor, not yet identified.