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.
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