Scientists find way to control brain blood flow using light pulses

Researchers at Orel State University named after I. S. Turgenev have developed a method to control cerebral blood flow without contact using light pulses. By applying a targeted laser beam, the team achieved precise dilation of blood vessels, which could provide new options for treating ischemic injuries. The technique relies on activating singlet oxygen in non-toxic concentrations. The scientists found that under specific conditions, this form of active oxygen functions as a signaling transmitter rather than a cell destroyer. According to data from the Ministry of Science and Higher Education, a laser with a wavelength of 1267 nm triggers a calcium release in astrocytes—the cells responsible for neuron nutrition and capillary tone. Experimental data shows that light-stimulated astrocytes release ATP, initiating a chain reaction in adjacent cells. This process leads to the relaxation of vessel walls and increases the flow of oxygenated blood to the targeted area. The researchers noted that this reaction occurs independently of nitric oxide and does not cause negative responses in neurons, suggesting the radiation dosages used are safe.