Biomedical subjects
Publications and source records attributed to Y C Jin.
Twenty cases of unruptured tube pregnancy were treated with Trichosanthin intramuscularly given. Only two cases were eventually operated, so the effective rate was 90%. The hysterosalpingography was taken in 14 of 18 cases who was willing to accept the procedure at 0.5-1.5 year after the conservative treatment. Both tubes were patent in 10 of 14 cases, the rate of patency was 71.4%.
Four hundred and fifty pregnant women were recruited for termination of early gestation by mifepristone combined with dl-15-methyl PGF2 alpha or misoprostol. Eight-four out of 450 subjects received curettage because of heavy or prolonged vaginal bleeding and slow decline of urinary hCG levels. Histopathology examinations of specimens obtained during curettage revealed denatured, necrotic and obscure villi and trophoblasts in 77 specimens, which accounted for 91.7%. Among them, 68 samples were mingled with inflammatory cell infiltration, and 15 with decidual cells, only 3 were villi and trophoblasts alone. The remaining 7 specimens were decidua in 6 and inflammatory infiltration in 1, which accounted for 7.1% and 1.2% respectively. This study suggested that the major cause resulting in heavy or prolonged vaginal bleeding after medical abortion by mifepristone and prostaglandin analogue was residual villi and trophoblasts with inflammatory cell infiltration.
During 1972-1986, 44 of 52 patients (84.6%) with hydatidiform mole were treated successfully with trichosanthin. Of these, 38 (73.1%) had complete spontaneous evacuation and 6 (11.5%) incomplete evacuation. The average time for evacuation of hydatidiform mole was 4.5 +/- 1.64 days. The amount of bleeding was less than 100 ml in 33 patients (75%), while that in 2 of the patients with incomplete evacuation was more than 300 ml. Malignant changes occurred in two of the 44 patients (4.5%). The malignant rate was similar to that (4-12.5, P greater than 0.05) of prophylactic chemotherapy. We consider that thrichosanthin is a better approach to the treatment of hydatidiform mole.
A double blind clinical trial on prostaglandin for cervix ripening prior to vacuum aspiration for termination of early pregnancy in primigravidae was carried out in 68 patients with 6-11 week's gestation. The patients were randomly treated with either 1.0 mg of 15-methyl-prostaglandin F2 alpha methyl ester vaginal suppository or a placebo suppository. A mean cervical dilation to 6.6 mm was achieved with minimal side effects in the prostaglandin group as against 4.3 mm in the placebo group. The 15-methyl-prostaglandin F2 alpha methyl ester suppository technique seems to be effective, safe and simple in ripening the cervix for termination of early pregnancy in primigravidae.
Pathological studies on the aborted materials after the administration of trichosanthin at the end of mid-term gestation have revealed that there is an extensive coagulative necrosis of the trophoblastic tissue of the placental villi. In 1971, we first used trichosanthin successfully to treat ectopic pregnancy instead of salpingectomy. Trichosanthin was given to the patients with ectopic pregnancy who were clinically stable and had no signs of acute distress or large quantity of intraperitoneal hemorrhage. From 1971 to 1986, a total of 71 patients were treated with trichosanthin with a success rate of 85.9% and a subsequent fertility rate of 82.6%.
A P2 membrane preparation of rat brain (without cerebellum) was solubilized with CHAPS in Tris containing DTT and trypsin inhibitor. Two opiate ligands, 10b and 10cd, prepared by Liu et al, were employed consecutively in affinity chromatography, from which OPR's were eluted with Nx. The eluate was subsequently passed through a WGA affinity column and the OPR's eluted with N-GluNAc. This eluate was further purified and concentrated by preparative granular gel isoelectric focusing on SG200. Two protein peaks appeared separately at pH 5 and 7.8. The eluates from both peaks were examined for protein contents using the silver staining method, and binding activity was measured by RRA with 3H-etor. The results revealed that both samples contained active OPR purified to over 80,000 fold. The Mr was estimated by gel filtration to be 52 kD and 42 kD for OPR in the pH 5 and pH 7.8 samples respectively. OPR in the pH 5 sample have been determined to be of mu-type by their binding activity with 3H-ohm.
P2 membrane preparation of rat brain (without cerebellum) was solubilized with CHAPS in Tris containing DTT and trypsin inhibitor. Two opiate ligands, 10b and 10cd, prepared by Liu et al, were applied consecutively in affinity chromatography, from which OPRs were eluted with Nx. The eluate was subsequently passed through a WGA affinity column and the OPR eluted with N-GluNAc. This eluate was further purified and concentrated by preparative granular gel isoelectric focusing on SG200. Two protein peaks appeared separately at pH 5 and pH7.8. The eluates from both peaks were analyzed for protein content by using silver staining method and binding activity was measured by RRA with 3H-etor. The results revealed that both samples contained active OPR purified to over 80,000 fold. The Mr was estimated by gel filtration to be 52 and 42 kD for OPR in the pH 5 and pH 7.8 samples respectively. The OPR in pH 5 sample has been characterized to be of mu-type, by its binding activity with 3H-ohm.
7 alpha-Bis (beta-chloroethyl)amino-methyl-6,14-endoethenotetrahydrooripavine (alpha-CAM) was found to bind to opioid receptors irreversibly and react directly with sulfhydryl (SH) groups in P2 preparations of rat brain. The P2 preparations were pretreated as follows: protection of the SH groups at the opioid receptor binding sites by morphine or etorphine, and inactivation of the SH groups outside the binding sites by N-ethylmaleimide (NEM), followed by removal of the morphine or etorphine by washing. alpha-CAM was still able to bind the pretreated P2 preparations in an irreversible manner. The results indicate that the formation of covalent bonds between alpha-CAM and the SH groups of opioid receptor binding sites is possibly one of the biochemical mechanisms of the irreversible action of alpha-CAM.
7 alpha-bis (beta-chloroethyl) aminomethyl-6, 14-endoetheno-tetrahydro oripavine (alpha-CAM) is a new irreversible opioid receptor agonist. Its effect on isolated tissues (guinea pig ileum, mouse vas deferens, rat vas deferens and rabbit vas deferens) were studied. It was shown to be bound irreversibly to rat brain P2 membrane preparations. The ED50 of its analgesic effect in mice (icv) was found to be 0.12 nmol/mouse, and the effect may last as long as 2-3 days. It is a compound which produces the longest analgesia known up to date. A single dose (icv) of alpha-CAM was sufficient to produce dependence in mice. Thus, the compound may serve as an agent for studying the mechanism of physical dependence.
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A study was carried out between November 1981 and April 1982 on the immunological effect of administering trivalent live, oral polio vaccine to 200 mature healthy neonates from Henan Province, China. The initial dose of vaccine was given at 3 days of age, and 2 months thereafter antibodies to poliovirus types 1, 2, and 3, respectively, were detected in 46.7%, 60.7% and 48.6% of the neonates; after the second dose, the levels were 86.9%, 95.3%, and 97.2%, with geometric mean titres of 1:106.2, 1:349.8, and 1:232.5. Almost 100% of neonates exhibited antibodies after the fourth dose of vaccine. Eighty-two percent of the neonates excreted poliovirus for at least a week after the initial dose of vaccine, and this increased to 99% after the second dose. Seroconversion at 4 months of age was similar to that of a group of controls who received their initial dose of vaccine at 2 months of age; however, immunization of neonates induced immunity to poliovirus at the earliest possible age.
It has been found that the effects of opiates and opioid peptides on RVD are of two types. Compounds of the first type such as Etor, Eton, fentanyl and prodine derivatives, Met- and Leu-Enk and DADL are biphasic in nature. At lower concentrations (10(-8)-10(-5) M) they have inhibitory effects and at higher concentrations (10(-5)-10(-4) M) they are excitatory. Compounds of the second type, such as Mor, benzomorphan derivates, Cyc and SKF and the antagonist Nx have virtually no or only weakly inhibitory effects but may antagonize the inhibitory effect produced by the first group of compounds at lower concentrations. MC belongs to the second type, but it cannot antagonize the inhibitory effect of beta-End. The results are discussed in terms of multiple receptors, the high and low affinity binding sites, and the interrelationship between receptors.
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