Effect of Endothelial Progenitor Cell Transplantation on Pulmonary Hypertension in Rats / 中华高血压杂志

Objective To investigate the hemodynamics and structural effect of rat endothelial progenitor cells (EPC) transplant on pulmonary artery hypertension (PAH) induced by monocrotaline(MCT) in rats.Methods EPCs were identified and marked.Twenty-one days after injection of EPCs,the pulmonary hemodynamic parame- ters,average pulmonary artery pressure (mPAP),right heart index were determined.The vascular endothelial cells and pulmonary vascular structural changes were verified by fluoresccuse microscope.Results Compared with the model,EPCs treatment(n=10) decreased mPAP significantly (mPAP,EPCs:25.9?0.7 mmHg vs model group:29.3?2.2 mmHg,P

Regulatory network of hippocampal-systemic arterial blood pressure during epileptic network reestablishment / 中国应用生理学杂志

<p><b>AIM</b>To investigate the regulatory network of hippocampal-systemic arterial blood pressure during epileptic network reestablishment.</p><p><b>METHODS</b>7.2 microg picrotoxin (PTX) was microinjected into the right HPC (RHPC) to induce rat epilepsy. Contralateral hippocampal EEG, single unit discharges, femoral artery blood pressure and ECG were recorded simultaneously.</p><p><b>RESULTS</b>PTX might induce: (1) A resemblance interspike intervals (ISI) spot distribution of long duration neuronal burst and unit after discharges in contralateral HPC. (2) Delayed the initiation time of hippocampal neuronal bursts coupled with arterial blood pressure depression. (3) Hippocampal neuronal burst or unit after discharges coupled complexly with arterial blood pressure depression. (4) Resemblance hippocampal EEG interpeak intervals (IPI) and neuronal firing ISI spot distribution coupled with arterial blood pressure depression.</p><p><b>CONCLUSION</b>During contralateral hippocampal epileptic network reestablishment after microinjection of PTX to the RHPC, the function of the hippocampal-arterial blood pressure regulatory network could be modulated by characteristic network and neuronal temporal code patterning.</p>

Characteristics of electrographic and behavioral seizures induced by chronic tetanization of the right caudate-putamen in rats / 中国应用生理学杂志

<p><b>AIM</b>The electrographic and behavioral kindling effects were induced by chronic tetanization of the right caudate-putamen (CPu) to study the target-behavior expression involved in the CPu or hippocampus (HPC) network abnormalities.</p><p><b>METHODS</b>Experiments were performed on 58 SD rats. Tetanization (60Hz,0.4 - 0.6mA, 2s) was delivered into the CPu or the HPC, once a day, for 7-12 days. Animal behaviors were observed every day and depth electrographs were recorded at the beginning or at the end of the experiments.</p><p><b>RESULTS</b>Chronic tetanization of the CPu or of the HPC induced: (1) Rhythmic sharp waves in the CPu and paroxysmal epileptiform events in the HPC electrographs. (2) Primary behavioral seizures, secondary behavioral seizures, and kindling effects, including wet dog shakes (WEDS), rearing, face washing, immobility, chewing and head nodding. (3) Lower rate of primary WEDS (P < 0.01), and higher rate of secondary WEDS (P < 0.01) in the CPu-tetanized rats. (4) Longer silent period of behavioral seizures before kindling appeared in the CPu-tetanized rats.</p><p><b>CONCLUSION</b>Kindling effects in the CPu-tetanized rats resembles those in the HPC-tetanized rats. The CPu might participate in the origin of epileptic focus and be involved in reestablishment of limbic epileptic networks, which may be responsible for the target-behavioral seizures.</p>

Effects of berberine on EEG and EEG power spectrum recorded in conscious rabbits / 中国临床药理学与治疗学

Aim In order to study the mechanisms of underlying improving learning and memory in rodent, the effects of berberine (Ber) on EEG and EEG power spectrum were recorded in conscious rabbits.Methods EEG and EEG power spectrum were recorded in conscious rabbits with chronical implanted electrodes.Results Ber at doses of 1～4 mg?kg-1 iv showed to decrease dose_dependently the spectrum power of delta dominant frequency in cortical area and transfer the dominant frequency from delta to theta rhythm in hippocampus.Under the same conditions, the effects of physostigmine 0.1 mg?kg -1 iv on EEG were similar to Ber.Ber 2 mg?kg-1 iv reversed significantly these effects of Ber 0.05 mg/rabbit iv on EEG and power spectrum, but scopolamine butylbromide 0.4 mg?kg-1 iv, which can not pass the blood_brain barrier, did not.Conclusion The effects of Ber are closely related to the action on the central cholinergic system.