Analysis of the common morphological characteristics of cancerous cells using atomic force microscope / 南方医科大学学报

<p><b>OBJECTIVE</b>To observe the surface ultrastructure of different tumor cells in vivo using atomic force microscope (AFM) and analyze their common characteristics.</p><p><b>METHODS</b>We selected 60 specimens of each of normal liver cells, liver cancer, cervical squamous cells, cervical cancer cells, ductal epithelial cells and breast cancer cells for scanning using AFM. The cell surface scan images were analyzed using image analysis software to identify their common morphological features.</p><p><b>RESULTS</b>From normal cervical squamous epithelial cells, intermediate cells, and basal cells to HPV-infected cells, CIN2-3 cells and cervical cancer cells, the membrane surface roughness became gradually increased (P<0.05). Similarly, the surface roughness increased significantly in the order of normal liver cells, hepatitis B cirrhosis liver cells, and hepatocellular carcinoma cells (P<0.05). The average surface roughness also tended to increase from normal mammary gland cells to mammary gland hyperplasia cells and breast cancer cells (P<0.05).</p><p><b>CONCLUSION</b>Normal cells and tumor cells show different cell membrane morphologies, and such morphological features provide a reliable basis for clinical pathological diagnosis and differential diagnosis of malignancies.</p>

Expression of proteins in serum and hippocampus after closed brain injury in rats / 法医学杂志

OBJECTIVE@#To explore the difference of expression of proteins between the serum and hippocampus after brain injury in rats.@*METHODS@#Male SD rats were used to establish brain injury model. The changes of proteins expression profile in serum and hippocampus at different time after brain injury were analyzed using weak cationic exchanger (WCX2) chips and immobilized metal affinity capture arrays-Cu (IMAC-Cu) chips by surface-enhanced laser desorption/ionization time-of-flight mass spectrometry.@*RESULTS@#A total of 436 protein peaks were detected in serum and 346 protein peaks were detected in hippocampus using WCX2 chips. A total of 229 protein peaks were detected in serum and 345 protein peaks were detected in hippocampus using IMAC-Cu chips. The same 10 protein peaks were respectively detected in serum and hippocampus using WCX2 chips. The same 13 protein peaks were respectively detected in serum and hippocampus using IMAC-Cu chips.@*CONCLUSION@#The changes of protein expression profile in serum and hippocampus are obvious after closed brain injury and show a significant difference. The different proteins detected in serum and hippocampus using the same chip could be biochemical markers for determining brain injury.

Detection of distinct proteins for brain injury rats serum using a protein chip / 中国应用生理学杂志

<p><b>AIM</b>To explore the alteration of serum protein fingerprinting of rats subjected brain injury.</p><p><b>METHODS</b>Male Sprague-Dawley rats were randomly divided into seven groups, ie, normal control group, sham operation group, injury 4 h, 8 h, 12 h, 24 h and 48 h groups. The change of protein pattern in serum was monitored with weak cationic exchanger chip and surface-enhanced laser desorption ionization-time of flight-mass spectrometry.</p><p><b>RESULTS</b>The reduction of 5648 Da protein expression was detected at 4 h, 8 h or 12 h after injury (P < 0.01, compared with control and sham operation) and recovery at 24 h or 48 h. The increase of 9681 Da protein expression was detected at 4 h, 8 h or 12 h after injury (P < 0.05, compared with control and sham operation) and recovery at 24 h or 48 h.</p><p><b>CONCLUSION</b>The alteration of protein expression in serum could be induced after brain injury.</p>