British scientists claim creating human sperm

Newcastle research leader Karim Nayernia said in a statement Wednesday that the technique would allow researchers to study how sperm develops and possibly help develop treatments for infertile men. The research was published Wednesday in the journal Stem Cells and Development.

But many other British experts cast doubt on the research. They also said the sperm cells created in the laboratory were clearly abnormal.

I am unconvinced from the data presented in this paper that the cells produced by Professor Nayernias group from embryonic stem cells can be accurately called spermatozoa, said Allan Pacey,a senior lecturer in andrology at the University of Sheffield. Pacey said that the sperm created by Nayernia did not have the specific shape,movement and function of real sperm.

Azim Surani,a professor of physiology and reproduction at the University of Cambridge,said the sperm produced by the Newcastle team were a long way from being authentic sperm cells.

Nayernia said the cells showed all the characteristics of sperm, but his groups intention was simply to open up new avenues of research with their early findings,rather than using the sperm to fertilize eggs.

Robin Lovell-Badge,a stem cell expert at the National Institute of Medical Research,said that despite the questions raised,Nayernia and colleagues may have made some progress in obtaining human sperm from embryonic cells.

Nayernia said creating embryos from lab-manufactured sperm is banned by British law. Some lawmakers said provisions should be made to allow sperm derived from stem cells to be tested for potential fertility treatments.