Bloody ending

 作者:邝抻龚     |      日期:2019-03-08 08:09:00
THE substance that stops blood vessels growing into the eye could lead to treatments for some types of blindness and cancer. Noel Bouck and her colleagues at Northwestern University Medical School in Chicago have isolated a protein secreted by the cells of the retina which stops blood vessels invading the cornea and the interior of the eye. The researchers suggest that injections of the protein—called pigment epithelium-derived factor—might protect eyes from damage caused by unwanted blood vessels as a result of ageing, viral infection or diabetes (Science, vol 285, p 245). Bouck also expects the protein to tackle tumours by shutting off blood vessels that feed them and by blocking their growth. “It should have a double-barrelled effect,