RESUMO
To observe the expression of cyclooxygenase (COX)-1 and COX-2 in brain after spared nerve injury (SNI) and compare the analgesic effects of COX inhibitors with different selectivity. Radioimmunoassay, RT-PCR and Western blotting techniques were used to evaluate the change of brain COX expression at different time points( before SNI, 1 h, 12 h, 1 d, 3 d, 7 d, 14 d, 30 d and 60 d after SNI); By exploring hot plate test, we observed the reacting time of animals after injection of saline, NS-398, SC-560 and indomethacin at different time points. The results showed that: ( 1 ) The expression of brain COX-1 didn't increase significantly until 14 d after SNI, while that of COX-2 increased significantly and rapidly after SNI and reached peak at the time point of 1 d ( all P ＜0.05 ); (2) NS-398 showed significant analgesic effect on neuropathic pain after SNI at the early phase ( P ＜ 0.05 ), but didn't persist for over 30 d; ( 3 ) Indomethacin and SC-560 didn't show significant analgesic effects until 14 d. These results suggest that brain COX-1 is involved in the late phase of neuropathic pain and may play a role in the persistence of pain, while brain COX-2 is involved in the early phase of neuropathic pain and may play a role in the pain origination.
RESUMO
Objective To expound emphatically the application of nuclear medical examination in primary hyperparathyroidism.Methods 22 patients (19 adenomas,3 hyperplasia) with primary hyperparathyroidism confirmed by clinical examination and surgery underwent the detection of parathormone (PTH) by immunoradiometric assay (IRMA) and double phase 99 Tcm-MIBI parathyroid imaging,of whom 15 performed 99 TcmO-4 thyroid imaging and 8 99 Tcm-MDP bone imaging.Results The level of serum PTH in all patients (428.21±256.48) was significantly higher as compared to normal value and in cases with adenomas (781.83±194.56) was markedly elevated.The sensitivity of 99 Tcm-MIBI early and delayed phase imaging in detecting lesions of parathyroid adenomas was 84.2% and 100%,respectively.The sensitivity in detecting lesions of hyperplasia was only 33.3%.With 99 Tcm-O-4 thryoid imaging,the cold nodules were present in 2 and normality in 13.As to bone imaging,the scans were abnormal in 7.Their severities on bone scintigraph were correlated with the duration of the disease.Conclusions The level of serum PTH detected by IRMA and double phase 99 Tcm-MIBI parathyroid imaging are both sensitive methods in qualitative diagnosis and localization of hyperthyroidism.99Tcm-MIBI imaging has limited value for detecting the hyperplasia.The thyroid and bone imaging may well improve the diagnostic sensitivity and accuracy,and reflect the stage and progress of hyperparathyroidism.