Bcl-2 expression following the brain concussion in rats / 法医学杂志

OBJECTIVE@#To evaluate the expression of Bcl-2 protein after brain concussion.@*METHODS@#Expression levels of Bel-2 protein in cortex, pontine and cerebellum of rats were investigated using immunohistochemistry.@*RESULTS@#There was no expression of Bcl-2 protein in control group seen. The expression of Bcl-2 protein in brain concussion groups was detected at l hour, and the expression level reached its peak 4 days after the concussion and then declined gradually.@*CONCLUSION@#Our findings suggest that the detection of Bel-2 protein could be an indicator for diagnosis of brain concussion and for estimation of the post injury time interval.

The evaluation of 12 STR loci genetic polymorphism in Han population / 法医学杂志

OBJECTIVE@#To investigate the genetic polymorphism of 12 STR loci in 240 Han population and evaluate application of the 12 STR loci systems in forensic cases.@*METHODS@#12 STR loci were amplified with Muti-loci STR PCR system, which were genotyped with electrophoresis separation on dPAGE.@*RESULTS@#12 STR loci system had high power of discrimination (DP) and it was suited for analysis of dated bloodstain especially.@*CONCLUSION@#The 12 STR loci systems is simple economy and practicality, which is useful in forensic identification and disputed paternity.

Expression of c-myc protein on rats' brains after brain concussion / 法医学杂志

OBJECTIVE@#To study the changes of expression of c-myc protein on rats' brains after brain concussion.@*METHODS@#sixty rats were randomly divided into brain concussion groups and control group. The expression of c-myc protein was microscopically observed by immunohistochemical method.@*RESULTS@#No expression of c-myc protein in control group were observed. However, positive expression of c-myc protein in some neurons was seen at 20 min after brain concussion, and reach to the peak at 8h after brain concussion and then decreased gradually.@*CONCLUSION@#These findings suggest that the detection of c-myc protein could be an index of diagnosis of brain concussion.

In vivo distribution of c-myc antisense oligodeoxynucleotides local delivered by gelatin-coated platinum-iridium stents in rabbits and its effect on apoptosis / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Post-stenting restenosis is a significant clinical problem, involving vascular smooth muscle cells (VSMCs) proliferation and apoptosis. It is reported that c-myc antisense oligodeoxynucleotides (ASODNs) local delivered by catheter can inhibit VSMCs proliferation. This study was designed to assess tissue distribution of c-myc ASODN local delivered using gelatin-coated platinum-iridium (Pt-Ir) stents, and its effect on apoptosis of VSMCs.</p><p><b>METHODS</b>Gelatin-coated Pt-Ir stents that had absorbed caroboxyfluorescein-5-succimidyl ester (FAM) labeled c-myc ASODNs (550 microg per stent) were implanted into the right carotid arteries of 6 rabbits. Tissue samples were obtained at 45 minutes, 2 hours, and 6 hours. Tissue distribution of c-myc ASODNs was assessed by fluorescence microscopy. In addition, 32 rabbits were randomly divided into two groups. Rabbits in the control group (n = 16) were implanted with gelatin-coated Pt-Ir stents, and those in the treatment group (n = 16) were implanted with gelatin-coated stents that had absorbed c-myc ASODNs. 7, 14, 30, or 90 days (n = 4, respectively, for each group) after the stenting procedure, the stented segments were harvested, and histopathological examinations were performed to calculate neointimal area and mean neointimal thickness. The expression of c-myc was assessed using in situ hybridization (ISH) and immunohistochemical methods. Apoptotic VSMCs were detected using terminal deoxynucleotidyl transferase mediated dUTP nick end labeling (TUNEL) and transmission electron microscope (TEM).</p><p><b>RESULTS</b>According to fluorescence microscopic results, FAM-labeled c-myc ASODNs were concentrated in the target vessel media at the 45 minutes time point, and then dispersed to the adventitia. Morphometric analysis showed that neointimal area and mean neointimal thickness increased continuously up to 90 days after stent implantation, but that total neointimal area and mean neointimal thickness were less in the treatment group than in the control group at all time points (P < 0.0001). At day 7 and day 14 after stenting, there were no detectable apoptotic cells in either group. However, apoptotic cells were present in the neointima 30 and 90 days after stenting, and the number of apoptotic cells was less at 30 days than at 90 days. Meanwhile, c-myc ASODNs appeared to induce apoptosis in more cells in the treatment group than that in the control group. Typical apoptotic VSMCs were observable under TEM. The expression of c-myc was positive in the control group and negative or weakly positive in the c-myc ASODN treatment group, according to both ISH and immunohistochemical examination.</p><p><b>CONCLUSION</b>Gelatin-coated Pt-Ir stent mediated local delivery of c-myc ASODNs is feasible. The localization of c-myc ASODN is primarily in the target vessel walls. c-myc ASODNs can inhibit VSMCs proliferation and induce its apoptosis after local delivery in vivo.</p>