ABSTRACT
Objective To analyze the expression of apoptosis-relared genes of retinal blood vessel in early diabetic rats by gene chip technology. Methods To make diabetic rat model by intraperitoneal injection of streptozotocin (STZ). On the 6th week after blood pressure increased, 10 rats were executed in Diabetic group and normal control group respectively. 20 retinal blood vessels were extracted and the RNA was isolated. The probe was made of α-32 P-deoxyadenosine triphosphate (dATP)-labeled sample which hybridized 1176 nylon chips, and then analyzed by software. Three different expression genes were selected to verify by reverse transcription polymerase chain reaction (RT-PCR). Results On the 6th week, 136 (11.5%)genes were differentially expressed [up-regulated genes were 90 (7.6%), down- regulated genes were 46(3.9%)] in diabetic group. These genes involved into different groups according to their function. Especially in 72 apoprosis-related genes, 15 genes were differentially expressed. The up- regulated genes were some TNF receptor family members such as TNFRSF12, TRAIL, TNFRSF9, FADD;Bcl-2 family members such as bcl-w, bax, bakl and AKT. The down-regulated genes were FAF1 which related to fas. Conclusions The expression of retinal vascular gene in early diabetic rats has been changed complicatedly. In particular, the multiple apoptosis-related genes have been changed in early diabetic, and most of them are at the upstream of apoptosis pathway. These findings indicate that the development of diabetic retinopathy is associated with multiple signaling pathways leading to apoptosis, while the alterations on the level of molecular biochemistry are still limited in apoptosis induction period.
ABSTRACT
Objective: To discovery the central mechanism of acupuncture Heart Meridian precondition myocardial ischemia in gene expression pattern, the authors applied gene chip tech to filter variably expressed genes in hypothalamus. Methods: Rats were seperated into normal, model, acupuncture Heart Meridian group and acup Lung Meridian group randomly. Acute myocardial ischemia rat model was made with ligation left anterior descending branch of the coronary artery. After model succeed, select hypothalamus seperately and mixed the same group together of 3 rats. Then applied Rats U230A genechip refered by Affymetrix Co. to compare the variations between these groups. Results: To compare with normal group, differential expression genes and expression sequence tags (ESTs) in model group were 73 with signal log ratio ≤ 1 and 92 with signal log ratio ≤-1 , mainly included ion channel, calcium/ calmodulin-dependent protein kinase Ⅱ inhibitor, antigen and so on. Similarly, compared with model group, differential expression genes and expression sequence tags (ESTs) were 190 with signal log ratio ≥ 1 and 34 with signal log ratio ≤-1 in acupuncture Heart Meridian group, mainly included 5-hydroxytryptamine receptor, cellular metabolism, fatty, immuno reaction, G-protein coupled receptors, ion transport, signal transductions and so on, while in acupucnture Lung Meridian, the number is 57 and 26 correspondly. Conclusion: There were exactly variations in hypothalamus mechanism that relate to acupuncture Heart and Lung Meridians.