ABSTRACT
OBJECTIVE@#To study the effect of rapamycin on scar formation in rabbit eyes following filtering operation and explore the possible mechanism.@*METHODS@#Ninety-six healthy adult rabbits were subjected to trabeculectomy of the left eye and subsequently randomly divided into 4 groups (=24) for treatment with castor oil (control) or rapamycin (1%, 3%, or 5%) eye drops of the operated eyes 4 times a day. The morphology and function of the filtering blebs of the rabbits were compared at 7, 14, 21 and 28 days after the operation; at each of the time points, 6 rabbits from each group were euthanized for detection of expressions of proliferating cell nuclear antigen (PCNA) and α-smooth muscle actin (α-SMA) in the tissues in the surgical area using immunohistochemistry. Cultured rabbit subconjunctival fibroblasts (RTFSs) were treated with different concentrations of rapamycin (0.06, 0.25, 1, and 4 mg/L) and the cell apoptosis was detected using flow cytometry.@*RESULTS@#In the first, second and third weeks after the operation, the rate of functional follicle formation was significantly higher in the 3 rapamycin groups than in the control group ( < 0.05), and the number of α- SMA-positive fibroblasts decreased over time in the 3 rapamycin groups. In cultured RTFSs, treatment with rapamycin at different concentrations resulted in increased apoptosis of the cells, and rapamycin above 0.25 mg/L significantly increased the cell apoptosis in a dose-dependent manner.@*CONCLUSIONS@#Rapamycin can inhibit hyperplasia of the filtering passage tissue, helps to preserve the functional filtering blebs and prolong their life span, and induces apoptosis of RTFS.
ABSTRACT
Objective: To investigate the effect of epidural block analgesia on childbirth, mother and child. Methods: A retro-spective study was used. Totally 200 primipara were divided into two groups according to the analgesia method. The 100 cases in the observation group was undergone lumbar epidural puncture and cathetering at the 2-3 section when the cervix was with 2-3cm opening, 0. 075% ropivacaine hydrochloride and sufentanil 10ml was infused firstly, and then 0. 075% ropivacaine and sufentanil was infused continuously through a self-control analgesia pump at the speed of 6-8ml·h-1 till the cervix was nearly all opened. The other 100 cases in the control group were without anesthesia when the cervix was with 2-3cm opening. The analgesia effect, labor time, delivery mode, postpartum hemorrhage amount, fetal distress and postpartum hemorrhage of the two groups were compared. Results:The analgesic ef-fective rate of the observation group was 97. 0%, which was significantly higher than that of the control group (10. 0%, P0. 05). Conclusion:Ropivacaine at low concentration combined with sufentanil used in epidural block analgesia has promising analgesic effect, which can shorten labor time to promote the smooth delivery.
ABSTRACT
<p><b>OBJECTIVE</b>To study the effect of matrix metalloproteinases inhibitor GM6001 in suppressing scar tissue formation in the filtering passage after glaucoma filtration surgery.</p><p><b>METHODS</b>Twenty-four pigmented rabbits (48 eyes) underwent trabeculectomy followed by subconjunctival injection of GM6001 in the right eye (treated eyes) and injection of PBS in the left eye (control) once a day. The intraocular pressure was monitored postoperatively and proliferating cell nuclear antigen (PCNA)- and α-smooth muscle actin (α-SMA)-positive cells in the filtering pathway were detected using immunohistochemistry.</p><p><b>RESULTS</b>On postoperative days 7, 14, 21, and 28, the intraocular pressure was significantly lower in the treated eyes (GM6001) than in the control eyes (P<0.01). The counts of PCNA- and α-SMA-positive cells were also significantly lowered in the treated than in the control eyes (P<0.01).</p><p><b>CONCLUSION</b>GM6001 can inhibit excessive proliferation of the fibroblasts in the filtering pathway to suppress scar tissue formation and prolong the existence of the functional filtration bleb in rabbits.</p>