OBJECTIVE:To evaluate the effects of Taichong (LR 3) acupuncture points (acupoints) on the expression of glucose transporter protein 1 (GLUT1) in the hypothalamus of spontaneously hypertensive rats (SHRs) as measured by combined positron emission tomography and computed tomography (PET-CT).METHODS:Spontaneously hypertensive rats (SHR) were divided into model,Taichong (LR 3) acupuncture,and sham groups.Additionally,Tokyo Wistar rats were used as the control group.Changes in blood pressure were recorded in different groups of rats before and after the corresponding treatment.Hematoxylin and eosin (HE) staining was used to study basic morphological changes,and immunohistochemistry was used to determine GLUT1 expression in the hypothalamus.Further,PET-CT was utilized to elucidate the antihypertensive mechanism after acupuncture at the Taichong (LR 3) acupoints.RESULTS:PET-CT indicated activation of the hypothalamus.Measurement of blood pressure showed that acupuncture at the Taichong (LR 3) acupoints lowered blood pressure.HE staining did not show any significant pathological changes,although differences in cell number were observed.Immunohistochemical analysis indicated a GLUT1 downregulation in the SHRs of theTaichong (LR 3) acupuncture group after the treatment.CONCLUSION:Acupuncture at Taichong (LR 3) acupoints lowered blood pressure in SHRs,with possible mechanisms being changes in cell number and GLUT1 expression in the hypothalamus.