Abstract
ADP ribosylation factors (ARFs) of small GTPase are molecular switches regulating various membrane dynamics. Among them, ARF6 has recently been highlighted because of its function to facilitate the interaction between the cytoskeleton and the plasma membrane. Each ARFs has its preferable or even specific guanine nucleotide exchange factors (GEFs) as its activators. According to our previous RT-PCR analysis, EFA6A, a guanine nucleotide exchange factor for ARF6, was restrictedly expressed in the brain, retina and testis. Different from previous studies on neurons, EFA6A, a guanine nucleotide exchange factor for ARF6, was first shown to be localized intensely in nuclei of spermatocytes of adult mouse testes in the present immunohistochemical study. This suggests a possible involvement of EFA6A-ARF6 signaling in the karyokinesis and cytokinesis.
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