Andreas Rennhack1, Christian Schiffer2, Christoph Brenker2, Dmitry Fridman1, Elis T Nitao3, Yi-Min Cheng4, Lara Tamburrino5, Melanie Balbach1, Gabriel Stölting6, Thomas K Berger1, Michelina Kierzek2, Luis Alvarez1, Dagmar Wachten7,8, Xu-Hui Zeng4, Elisabetta Baldi5, Stephen J Publicover3, U Benjamin Kaupp1, Timo Strünker2. 1. Department of Molecular Sensory Systems, Center of Advanced European Studies and Research (CAESAR), Bonn, Germany. 2. University Hospital Münster, Centre of Reproductive Medicine and Andrology, Münster, Germany. 3. School of Biosciences, University of Birmingham, Birmingham, UK. 4. Institute of Life Science and School of Life Science, Nanchang University, Nanchang, Jiangxi, China. 5. Department of Experimental and Clinical Medicine, Center of Excellence DENOTHE, University of Florence, Florence, Italy. 6. Institute of Complex Systems - Zelluläre Biophysik 4, Forschungszentrum Jülich, Jülich, Germany. 7. Max-Planck Research Group of Molecular Physiology, Center of Advanced European Studies and Research, Bonn, Germany. 8. Institute of Innate Immunity, University Hospital, University of Bonn, Bonn, Germany.
Abstract
BACKGROUND AND PURPOSE: Sperm from many species share the sperm-specific Ca2+ channel CatSper that controls the intracellular Ca2+ concentration and, thereby, the swimming behaviour. A growing body of evidence suggests that the mechanisms controlling the activity of CatSper and its role during fertilization differ among species. A lack of suitable pharmacological tools has hampered the elucidation of the function of CatSper. Known inhibitors of CatSper exhibit considerable side effects and also inhibit Slo3, the principal K+ channel of mammalian sperm. The compound RU1968 was reported to suppress Ca2+ signaling in human sperm by an unknown mechanism. Here, we examined the action of RU1968 on CatSper in sperm from humans, mice, and sea urchins. EXPERIMENTAL APPROACH: We resynthesized RU1968 and studied its action on sperm from humans, mice, and the sea urchin Arbacia punctulata by Ca2+ fluorimetry, single-cell Ca2+ imaging, electrophysiology, opto-chemistry, and motility analysis. KEY RESULTS: RU1968 inhibited CatSper in sperm from invertebrates and mammals. The compound lacked toxic side effects in human sperm, did not affect mouse Slo3, and inhibited human Slo3 with about 15-fold lower potency than CatSper. Moreover, in human sperm, RU1968 mimicked CatSper dysfunction and suppressed motility responses evoked by progesterone, an oviductal steroid known to activate CatSper. Finally, RU1968 abolished CatSper-mediated chemotactic navigation in sea urchin sperm. CONCLUSION AND IMPLICATIONS: We propose RU1968 as a novel tool to elucidate the function of CatSper channels in sperm across species.
BACKGROUND AND PURPOSE: Sperm from many species share the sperm-specific Ca2+ channel CatSper that controls the intracellular Ca2+ concentration and, thereby, the swimming behaviour. A growing body of evidence suggests that the mechanisms controlling the activity of CatSper and its role during fertilization differ among species. A lack of suitable pharmacological tools has hampered the elucidation of the function of CatSper. Known inhibitors of CatSper exhibit considerable side effects and also inhibit Slo3, the principal K+ channel of mammalian sperm. The compound RU1968 was reported to suppress Ca2+ signaling in human sperm by an unknown mechanism. Here, we examined the action of RU1968 on CatSper in sperm from humans, mice, and sea urchins. EXPERIMENTAL APPROACH: We resynthesized RU1968 and studied its action on sperm from humans, mice, and the sea urchin Arbacia punctulata by Ca2+ fluorimetry, single-cell Ca2+ imaging, electrophysiology, opto-chemistry, and motility analysis. KEY RESULTS:RU1968 inhibited CatSper in sperm from invertebrates and mammals. The compound lacked toxic side effects in human sperm, did not affect mouseSlo3, and inhibited humanSlo3 with about 15-fold lower potency than CatSper. Moreover, in human sperm, RU1968 mimicked CatSper dysfunction and suppressed motility responses evoked by progesterone, an oviductal steroid known to activate CatSper. Finally, RU1968 abolished CatSper-mediated chemotactic navigation in sea urchin sperm. CONCLUSION AND IMPLICATIONS: We propose RU1968 as a novel tool to elucidate the function of CatSper channels in sperm across species.
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