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  Ca2+ signalling, motility and acrosome reaction in human spermatozoa


   School of Biosciences

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Dr S J Publicover  Applications accepted all year round

About the Project

[Ca2+]i signalling is used by sperm to regulate most if not all of their activities. Our work, which is being carried out in collaboration with the School of Medicine and the Assisted Conception Unit at the Birmingham Women's Hospital, is focused on Ca2+ signalling mechanisms that are activated by interaction of human sperm with the oocyte, with oocyte-derived factors and with cells of the female tract. We are particularly interested in the expression and regulation of Ca2+ stores and Ca2+ influx channels (both of which play crucial roles in all Ca2+-regulated sperm activites and potentially fail in male-factor infertility) and in the participation of membrane potential in generation of [Ca2+]i signals. Currently we are focussing on the effects of nitric oxide on sperm Ca2+ signals, particularly the role of s-nitrosylation. We are using [Ca2+]i imaging, fluorimetry, patch clamping and molecular techniques in these studies.
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Please find additional funding text below. For further funding details, please see the ‘Funding’ section.

The School of Biosciences offers a number of UK Research Council (e.g. BBSRC, NERC) PhD studentships each year. Fully funded research council studentships are normally only available to UK nationals (or EU nationals resident in the UK) but part-funded studentships may be available to EU applicants resident outside of the UK. The deadline for applications for research council studentships is in January each year.

Each year we also have a number of fully funded Darwin Trust Scholarships. These are provided by the Darwin Trust of Edinburgh and are for non-UK students wishing to undertake a PhD in the general area of Molecular Microbiology. The deadline for this scheme is also in January each year.

The University of Birmingham also has a 'Doctoral Researcher Elite Scholarship Scheme' which aims to recruit the very best overseas PhD students to Birmingham - more details on this scheme can be found at http://www.graduateschool.bham.ac.uk/rsa/researchcouncils/drelite.shtml

Please note the only funding available for our PhD is via the Scholarships mentioned. All applicants should indicate in their applications how they intend to fund their studies. Any academically suitable applicant that does not indicate how they intend to fund their studies will be considered for the Darwin and/or the Elite Scholarships if not already indicated. We can only consider applicants who have their own funding or wish to apply for their own funding or are successful in gaining a Scholarship.

Funding Notes

Research Council Studentships are available for UK applicants. EU applicants resident in the UK may also be eligible. Non-UK students interested in molecular microbiology may apply for a Darwin Trust Scholarship. The deadline for applications for Research Council and Darwin Trust studentships is 31st January 2013.

We have a thriving community of International PhD students and encourage applications at any time from students of any nationality either able to fund their own studies or who wish to apply for their own funding (e.g. Commonwealth Scholarship Council, Islamic Development Bank).

For further information on funding see http://www.birmingham.ac.uk/schools/biosciences/courses/postgraduate/phd.aspx

References

Publicover, SJ, Harper CV, Barratt, CLR (2006) [Ca2+]i signalling in sperm - making the most of what you’ve got. Nature Cell Biol (in press) Harper CV, Barratt CL, Publicover S, Kirkman-Brown JC. (2006) Kinetics of the progesterone-induced acrosome reaction and its relation to intracellular calcium responses in individual human spermatozoa. Biol Reprod. (in press) K Bedu-Addo, CLR Barratt, J.C. Kirkman-Brown, SJ Publicover (2006) Patterns of [Ca2+]i mobilization and cell response in human spermatozoa exposed to progesterone. Developmental Biology (in press) Characterization of cyclic adenine dinucleotide phosphate ribose levels in human spermatozoa. Fertil Steril. (in press) Billington RA, Harper C, Bellomom Sc EA, Publicover S, Barratt CL, Genazzani AA. (2006) Jimenez-Gonzalez C, Michelangeli F, Harper CV, Barratt CL, Publicover SJ. (2006) Calcium signalling in human spermatozoa: a specialized 'toolkit' of channels, transporters and stores. Hum Reprod Update. 12:253-67 Bedu-Addo K, Lefievre L, Moseley FL, Barratt CL, Publicover SJ. (2005) Bicarbonate and bovine serum albumin reversibly 'switch' capacitation-induced events in human spermatozoa. Mol Hum Reprod. 11:683-91 Harper C, Wootton L, Michelangeli F, Lefievre L, Barratt C, Publicover S. (2005) Secretory pathway Ca2+-ATPase (SPCA1) Ca2+ pumps, not SERCAs, regulate complex [Ca2+]i signals in human spermatozoa. J Cell Sci. 118,:1673-1685. Harper CV, Publicover SJ. (2005) Reassessing the role of progesterone in fertilization--compartmentalized calcium signalling in human spermatozoa? Hum Reprod. 20, 2675-80 C Kirkman-Brown, CLR Barratt , SJ Publicover. (2004) Slow calcium oscillations in human spermatozoa Biochem J 378, 827-832 Y Gu, J C Kirkman-Brown, Y Korchev, CLR Barratt, SJ Publicover (2004)Multi-state, 4-aminopyridine-sensitive ion channels in human spermatozoa. Dev Biol 274, 308-317 Harper CV, Barratt CL, Publicover SJ. (2004) Stimulation of human spermatozoa with progesterone gradients to simulate approach to the oocyte. Induction of [Ca2+](i) oscillations and cyclical transitions in flagellar beating. J Biol Chem. 279, 46315-25 Claire V Harper, Jackson C.Kirkman-Brown, Christopher LR Barratt & Stephen J Publicover (2003) Encoding of progesterone stimulus-intensity by [Ca2+]i in human spermatozoa. Biochem J 372, 407-417 Linda Lefièvre, Christopher LR Barratt, Claire V. Harper, Sarah J. Conner, Frits M. Flesch, Emma Deeks, Fleur LC Moseley, Katherine L.Pixton, Ian A. Brewis, Steve J. Publicover. (2003) Physiological and Proteomic Approaches to Study Pre Fertilisation Events in the Human Reproductive Biomedicine Online 7(1) 12-20

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Project supervisors

Career overview

Dr Steve Publicover obtained both his BSc and PhD from the University of Liverpool. He has extensive experience in studying ion channels and cell signalling, particularly focusing on calcium ions (Ca2+) in various cell types'' physiology and pathology. His early research concentrated on synaptic transmission, synaptic plasticity, and Ca2+-mediated cell death in excitable cells. After relocating to Birmingham, Dr Publicover shifted his focus to signalling in mammalian bone, specifically investigating the glutamatergic signalling network. Currently, his laboratory is dedicated to human sperm physiology and sperm-egg signalling, exploring the signalling events triggered by the interaction of sperm with the oocyte-cumulus complex and the female reproductive tract. His research primarily examines Ca2+ signalling and ion channel regulation, aiming to understand how these processes influence human sperm motility in response to factors encountered in the female tract. Dr Publicover employs a range of techniques, including ion-imaging, electrophysiology, and molecular methods, alongside standard motility assessment techniques, to investigate signal transduction and the resulting responses in human sperm.


Research interests

Dr Publicover''s research focuses on sperm physiology and the signalling events initiated by sperm-egg interactions. His work encompasses ion channels and cell signalling, particularly calcium (Ca2+) signalling, in various cell types. Initially, he investigated synaptic transmission, synaptic plasticity, and Ca2+-mediated cell death in excitable cells. After relocating to Birmingham, he shifted his focus to signalling in mammalian bone, specifically the glutamatergic signalling network. Currently, his laboratory studies human sperm physiology and sperm-egg signalling, concentrating on the signalling events evoked by the interaction of sperm with the oocyte-cumulus complex and the female reproductive tract. His primary research interests include the roles of Ca2+ signalling and post-translational protein modification in regulating human spermatozoa activities, especially motility, in response to factors encountered in the female tract. He employs ion-imaging, electrophysiological, and molecular techniques, alongside standard motility assessment methods, to explore signal transduction and downstream responses in human sperm.

View Dr. Steve Publicover's profile