ABSTRACT
Objective To investigate the expression and effects of endothelin-1 (ET-1) in cerebral vessels of scalded rats. MethodHistological method was used to observe the alteration of histological structure of basilar artery in 8 scalded rats. Reverse transcription polymerase chain reaction(RT-PCR) was performed to examine expression of ET-1 mRNA;Western blotting to analyse expression of endothelin-1;radioimmunoassay to measure ET-1 levels;R3espectively, of cerebral basilar artery in 48 scalded rats. ResultVascular pathohistological changes were observed in cerebral basilar artery after rats were scalded;ET-1, ET-1 mRNA expression and ET-1 levels of basilar artery in scald 6 hours, 12 hours and 24 hours group were obviously higher than that of control group. Conclusion Scald may cause an increases of ET-1 expression in basilar artery, and elevated ET-1 expression may relate to the pathogenesis of cerebral vascular injury in scalded rats.
ABSTRACT
Objective To detect the changes of Endothelin-A receptor mRNA in the cerebral basilar artery of rats with experimental subarachnoid hemorrhage-induced cerebral vessel spasm as well as its effect. Methods Fifty-six Wistar rats were randomly divided into normal, experimental,sham-operated and saline-control groups. The experimental group was subdivided into subarachnoid hemorrhage(SAH)2,3,7 and 14?d groups. Reverse transcription polymerse chain reaction was used to study the changes of Endothelin-A receptor mRNA level in the cerebral basilar artery of rats with experimental subarachnoid hemorrhage-induced cerebral vessel. Results ET-A receptor mRNA level of basilar artery in SAH2, 3?d and 7?d group was higher obviously than that of normal group,sham-operated and saline-control groups. That of 14?d group was approximate to normal group.Conclusion ET-A receptor may play an important role in pathogenesis of SAH-induced cerebral vessel spasm.
ABSTRACT
In order to observe the pial and intracortical vessels in the upper and lower lips of calcarine sulcus, the normal human visual cortex of 15 brains (30 sides) were studied with scanning electron microscope (SEM), staining for alkaline phosphatase activity, continuous arterio-venous perfusion and clearing of thick sections according to Malligan's procedure. The results are: (1) Superficial pial arteries on visual cortex originate from calcarine artery, parieto-occipital artery, and inferior posterior temporal artery. Their branches destribute on the surface of the upper and lower lips of the calcarine sulcus resembling a comb. Two types of arterial anastomoses were found. The pial veins of the upper lip of the calcarine sulcus empty into the medial parieto-occipital vein, while those of the lower lip empty mostly into the medial occipital vein. (2) Intracortical arteries might be divided into five groups, i.e, short cortical artery, middle cortical artery, long cortical artery, subcortical artery and medullary artery. In general, they send out forward and recurrent branches. Veins might also be classified into five groups accordingly. There are four layers of vascular network within the striate cortex. The 3rd layer was clearly divided into sublayer 3a, 3b, 3c. The capillary density of the sublayer 3b is with lower density, which is just situated in Gennari's band. Angioarchitecture in the unstriate cortex is loosely arranged. The vascular density of each layer has been measured. The relationship between the blood supply of visual cortex and its clinical significance has been discussed as well.