[Expression and significance of neuropeptide and neurotensin in the extract of platelet of chronic renal failure patients during hemodialysis]. 
The aim of this study was to investigate the change of neuropeptide Y(NPY) content and neurotensin (NT) content of the platelet from chronic renal failure (CRF) patients during hemodialysis (HD) and explore its mechanism of action.  Platelet was separated from the patients' plasma and the NPY and and NT contents of the platelet and plasma were dynamically observed pre-HD and post-HD.  30 healthy people were chosen as the controls.  The results showed the NPY and NT contents of the platelet extract were (58.18 +/- 21.29) ng/10(9) and (25.38 +/- 13.43) ng/10(9) respectively.  The NPY content of the platelet extract of the CRF patients was obviously decreased and the NT content of the plasma was obviously increased however, the NT contents of the platelet extract and the plasma were both higher than those in the control group.  The NPY content of the platelet extract and NT content of the plasma at the post-HD obviously increased as compared with pre-HD, but the NT content of the platelet extract and the NPY content of the plasma obviously decreased.  There was an obvious correlation between NPY and NT.  The authors conclude that during the period of CRF, the immunoreactions which mainly involve bio-active substances such as NPY, NT and 5-hydroxytryptamine released by the platelet to interfer the vasoconstrictive effect are the main pathologic factors to induce renal hypertensin and renal vasospasm.