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Bando H, Sano T, Ohshima T, Zhang CY, Yamasaki R, Matsumoto K, Saito S. Differences in pathological findings and growth hormone responses in patients with growth hormone-producing pituitary adenoma. ENDOCRINOLOGIA JAPONICA 1992; 39:355-63. [PMID: 1446651 DOI: 10.1507/endocrj1954.39.355] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Plasma growth hormone (GH) responses to various stimuli were examined in 21 patients with GH-producing pituitary adenomas, classified into three types by the immunohistochemistry of cytokeratin and the glycoprotein hormone alpha-subunit distribution. Seven type 1 adenomas were exclusively composed of cells in which the cytokeratin formed a dot-like pattern; they were chromophobic to hematoxylin and eosin (H&E), occasionally positive for GH, and almost completely negative for the alpha-subunit. Thirteen type 2 adenomas were composed of cells with cytokeratin that had a perinuclear distribution; they were eosinophilic to H&E, and diffusely positive for both GH and the alpha-subunit. One patient had a type 3 adenoma which had a mixed pattern of intracellular cytokeratin distribution and was chromophobic and eosinophilic to H&E. Clinically, type 1 is characterized by earlier onset, larger tumor size, and more frequent aggressive extension. Paradoxical GH responses to TRH and OGTT were seen in 1 of 6 patients (16.7%) of type 1 and 8 of 9 patients (88.9%) of type 2, and 0% of type 1 and 62.5% of type 2, respectively. Type 2 cases showed higher plasma GH response to GH-releasing hormone, and a tendency to greater suppression of plasma GH by bromocriptine compared with type 1. Octreotide acetate administration revealed that the nadir/basal ratio of plasma GH levels was 42.9 +/- 6.6% in type 1 and 13.5 +/- 5.8% in type 2. These results suggest that there is a pathophysiological difference between these two distinct types of GH-producing pituitary adenomas.
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202
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Chen DQ, Zhang CY. A simple and convenient method for gaining pure populations of lymphocytes at the first mitotic division in vitro. Mutat Res 1992; 282:227-9. [PMID: 1378558 DOI: 10.1016/0165-7992(92)90100-v] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
This paper describes a simple method for obtaining pure populations of human lymphocytes at the first in vitro mitotic division (M-1) by continuous treatment with colchicine or colcemid. When colchicine (7.2 x 10(-8) M) or colcemid (4.8 x 10(-8) M) was added to cultures 0-24 h after initiation, cultures harvested at 54 h had more than 99.9% of mitotic cells in the first metaphase (M-1). We showed that not only more analyzable M-1 cells may be obtained, but staining for sister-chromatid differentiation may be avoided.
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203
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Bando H, Zhang CY, Takada Y, Takahashi H, Yamasaki R, Saito S. Correlation between plasma levels of ACTH and cortisol in basal states and during the CRH test in normal subjects and patients with hypothalamo-pituitary disorders. THE TOKUSHIMA JOURNAL OF EXPERIMENTAL MEDICINE 1991; 38:61-9. [PMID: 1668824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Using a new ACTH-immunoradiometric assay (IRMA), we measured plasma ACTH levels in the basal states and during CRH test in normal subjects and the patients with hypothalamo-pituitary disorders. The basal levels of plasma ACTH in 76 normal young (25-45 yr) and 140 elderly (60-85 yr) subjects were 23.1 +/- 13.6, and 17.5 +/- 11.2 pg/ml, respectively. The plasma ACTH levels were less than detection limit (5 pg/ml) in 3 patients with isolated ACTH deficiency, and less than 10 pg/ml in 6 of 7 patients with hypopituitarism. A significant correlation was observed between the basal levels of plasma ACTH and of cortisol in two age groups, with almost the same regression line, showing no age-related decline in the plasma levels of ACTH and cortisol. In 2 normal subjects and 2 patients with Cushing's disease, synchronized secretions of ACTH and cortisol were observed between 0800h and 1800h. In normal subjects and the patients with pituitary disorders, a significant correlation was observed between the Area Under the Curve's for plasma ACTH and cortisol during the CRH test. The correlation constant was higher in normal subjects, but lower in the patients with acromegaly, non-functioning pituitary tumor, and Cushing's disease in this order, suggesting low sensitivity of the pituitary-adrenal axis in these patients. These results suggest that the ACTH-IRMA kit provide reliable data for clinical investigation, and that the secretions of ACTH and cortisol correlate each other in basal states and during the CRH test in the patients with pituitary disorders as well as in normal subjects.
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204
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Zhang CY, Yamasaki R, Mitsuhashi S, Takahashi H, Bando H, Saito S. Radioimmunoassay of growth hormone-releasing hormone (GHRH) with a polyclonal antibody against synthetic GHRH(1-29)-Gly4-Cys-NH2: method and clinical studies. Clin Chim Acta 1991; 202:243-54. [PMID: 1687674 DOI: 10.1016/0009-8981(91)90055-h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A radioimmunoassay (RIA) for growth hormone-releasing hormone (GHRH) using a polyclonal antibody against synthetic GHRH(1-29)-Gly4-Cys-NH2 has been developed. The antiserum (RBM105) showed full cross-reactivity with GHRH-(1-44)NH2, GHRH-(1-40)OH, GHRH-(1-37)OH and GHRH-(3-44)NH2, and probably recognized the region of Ala4 to Lys12 of GHRH. Since the sensitivity of the GHRH RIA was 1.5 pg/tube, the lowest detectable plasma level was 5 ng/l when an extract of 0.3 ml of plasma per tube was used. On gelfiltration chromatography, the GHRH immunoreactivity of normal plasma was eluted in the same position as synthetic GHRH. The plasma GHRH concentration in healthy subjects was 20.5 +/- 6.5 ng/l (mean +/- SD), and in patients with hypothalamic disorders was 17.4 +/- 2.0 ng/l. In contrast, the plasma GHRH level in hemodialysis-dependent, chronic renal failure (CRF-HD) patients (38.7 +/- 13.1 ng/l) was significantly higher than normal. The acromegalic patients were 24.3 +/- 11.9 ng/l, except for one patient with ectopic GHRH syndrome (990 ng/l): his plasma GHRH level reached 7,100 ng/l during operation, and then decreased logarithmically to 70 ng/l after 6 h. Somatostatin at concentrations of 10 and 1,000 nmol/l significantly suppressed (GHRH release) from primary culture cells of the GHRH-producing tumor from 17.3 +/- 0.92 ng/2 x 10(5) cells to 9.98 +/- 3.61 and 4.32 +/- 1.01 ng/2 x 10(5) cells, respectively after 48 h. These data indicate that this GHRH RIA is useful for determining the plasma GHRH concentration in normal and diseased states and also for in vitro studies of GHRH release.
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205
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Shi W, Zhang CY. [Structure and characteristics of singer chain urokinase-type plasminogen activator]. SHENG LI KE XUE JIN ZHAN [PROGRESS IN PHYSIOLOGY] 1990; 21:314-7. [PMID: 2129250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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206
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Zhao J, Zhang CY, Xu DM, Huang GQ, Xu YL, Wang ZY, Fang SD, Chen Y, Gu YL. The antiatherogenic effects of components isolated from pollen typhae. Thromb Res 1990; 57:957-66. [PMID: 2116685 DOI: 10.1016/0049-3848(90)90162-6] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Based on the results of previous investigations that pollen Typhae, a Traditional Chinese Medicine, Had antiatherogenic effects, several components were isolated successively from the drug and their effects on porcine aortic endothelial cell (EC) and smooth muscle cell (SMC) cultures as well as on platelet aggregation were examined. 12 components isolated from Pollen Typhae have been identified on their chemical structures and biological effects. 4 of them showed different evident antiatherogenic effects. 1) Isorhamnetin-3-O-rhamnosyl-glucoside could stimulate EC to produce tPA and PGI2; 2) Quercetin-3-O-neohesperidose could protect EC from injury by fibrin, as well as raise tPA activity; 3) beta-Sitosterol palmitate could inhibit SMC proliferation and 4) beta-Sitosterol glucoside showed an inhibitory effect on platelet aggregation. These results would provide some information for the search of new drugs in the treatment and prevention of atherosclerosis.
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207
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Zhao J, Zhang CY, Xu DM, Huang GQ, Xu YL, Wang ZY, Fang SD, Chen Y, Gu YL. Further study of pollen typhae's effects on the production of tPA and PGI, by cultured endothelial cells. Thromb Res 1989; 56:677-85. [PMID: 2517363 DOI: 10.1016/0049-3848(89)90285-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We had reported that Pollen Typhae, a Chinese traditional herbal medicine could reduce atherosclerotic plaque formation in experimental animals. Fraction IV isolated from Pollen Typhae had the ability to raise tPA and PGI2 productions by cultured porcine aortic endothelial cells (EC). In this paper we reported that F.IV was divided chemically into four subfractions named SubF.1-4 among them SubF.2-2 was further separated from SubF.2, and SubF.4-1 from SubF.4. The six subfractions were tested for their effects on the productions of tPA (125I-fibrin plate method) and PGI2(RIA) by porcine endothelial cells. The results showed that SubF.3 could enhance tPA activity and SubF.2-2 could increase PGI2 level. With Chrono-Log 500 Lumi-Aggregometer, SubF.1,2-2 and 3 were found to be able to inhibit platelet aggregation and release reaction. These data indicated that the mechanisms of Pollen Typhae in its antiatherosclerotic effects were multiple which resulted from various biologic effects exerted by various components of this drug. Chemical analyses were performed and their structures were identified, demonstrating that SubF.2-2 was a flavonoid, while SubF.3 was a group of flavonoids, implying there are some antiatherogenic components in flavonoids.
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208
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Zhang CY, Wang TG. [A case-control study of endometrial cancer in Beijing]. ZHONGHUA LIU XING BING XUE ZA ZHI = ZHONGHUA LIUXINGBINGXUE ZAZHI 1989; 10:235-7. [PMID: 2805053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A case-control study was conducted among 150 woman suffered from endometrial cancer (EC) in Beijing from 1982.1.1-1985.12.31 and matched with two controls from the neighbourhood to explore the risk factors for EC. The data were analysed with X2 test and Linear Logistic Regression. Result of the study are listed. The risk factors directly related to EC might be obesity, nulliparity and low parity, early menarche, liver diseases. The risk factors indirectly related to EC might be irregular menstruation, premenstrual tension, dysfunctional uterine bleeding. The oral combined contraceptives showed a protective effect on EC. The results of the study support the EC etiology hypothesis of 'unopposed action of estrogen'.
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209
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Cong ZQ, Zhang CY. [Advances in the radiotherapy of myasthenia gravis]. ZHONGHUA SHEN JING JING SHEN KE ZA ZHI = CHINESE JOURNAL OF NEUROLOGY AND PSYCHIATRY 1987; 20:314-7. [PMID: 3330014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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210
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Xue ZH, Zhang XH, Liu YB, Cai CX, Zhang CY. Studies on anti-infective mechanism of the traditional Chinese medicinal preparation "anti-inflammatory agent no. 6"--its influence on immune functions of mice. JOURNAL OF TONGJI MEDICAL UNIVERSITY = TONG JI YI KE DA XUE XUE BAO 1987; 7:1-7. [PMID: 3599132 DOI: 10.1007/bf02888134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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211
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Zhang CY. [Histomorphologic changes in the myocardium in rabbits after ligation of the anterior descending branch of the left coronary artery]. ZHONGHUA XIN XUE GUAN BING ZA ZHI 1986; 14:237-9, 254-5. [PMID: 3816525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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212
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Kim IY, Zhang CY, Cantoni GL, Montgomery JA, Chiang PK. Inactivation of S-adenosylhomocysteine hydrolase by nucleosides. BIOCHIMICA ET BIOPHYSICA ACTA 1985; 829:150-5. [PMID: 3995047 DOI: 10.1016/0167-4838(85)90183-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The irreversible inactivation of S-adenosylhomocysteine hydrolase purified from hamster and bovine liver by adenosine analogs substituted in the 5' and 2 positions has been investigated in detail. 5'-Cyano-5'-deoxyadenosine inactivates as potently as 9-beta-D-arabinofuranosyladenine (Ara-A). Substitution of the Ara-A at the 2 position by halogens or deleting N at the 3 position decreases its potency. Although weak, 2',3'-dideoxyadenosine can also inactivate the enzyme. The irreversible inactivation of the hydrolase in rat hepatocytes incubated with 2-chloroadenosine or 3-deaza-Ara-A could be demonstrated, concomitant with increases in 35S-labeled S-adenosylhomocysteine and S-adenosylmethionine in the hepatocytes.
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213
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Kim IK, Zhang CY, Chiang PK, Cantoni GL. S-Adenosylhomocysteine hydrolase from hamster liver: purification and kinetic properties. Arch Biochem Biophys 1983; 226:65-72. [PMID: 6639063 DOI: 10.1016/0003-9861(83)90271-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
3-Deazaadenosine is both an inhibitor of and a substrate for S-adenosylhomocysteine hydrolase. Its administration to rats results in the accumulation of both S-adenosylhomocysteine and 3-deazaadenosylhomocysteine in the liver and other tissues. In hamsters, however, the administration of 3-deazaadenosine results only in the accumulation of 3-deazaadenosylhomocysteine (P. K. Chiang and G. L. Cantoni (1979) Biochem. Pharmacol. 28, 1897). In order to investigate the possible reasons for this difference, S-adenosylhomocysteine hydrolase from hamster liver has been purified to homogeneity and some of its kinetic and physical parameters have been determined. The molecular weight of the native enzyme is 200,000 with a subunit molecular weight of 48,000. The Km's for adenosine and 3-deazaadenosine are about 1.0 microM, and the Vmax's are also similar. The Km for S-adenosylhomocysteine is 1.0 microM, or more than 10 times smaller than the Km of the rat liver enzyme. This difference in Km value may explain the differences in the response of rat and hamster liver to the administration of 3-deazaadenosine. S-Adenosylhomocysteine hydrolase from hamster liver exhibits an interesting kinetic property in that its activity can be affected bimodally by either adenosine or adenosine analogs. At very low concentrations of these analogs, the activity of S-adenosylhomocysteine hydrolase can be stimulated by 10-30%, and at higher concentrations these same analogs become competitive inhibitors.
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214
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Zhao J, Zhang CY, Xu DM, Wang ZY. Preventive effects of pollen typhae and Radix Salviae Miltiorrhizae in atherogenesis. Inhibition on proliferation of aortic smooth muscle cells in culture. J TRADIT CHIN MED 1983; 3:177-83. [PMID: 6556401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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215
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Zhang CF, Jia YS, Wei HC, Zhu XM, Hui YM, Zhang CY, Mo QZ, Gong B. Studies on actions of extract of motherwort. J TRADIT CHIN MED 1982; 2:267-70. [PMID: 6765721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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216
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Zhang CY. [Xeroderma pigmentosum and its cancerous change--a report of 7 cases (author's transl)]. ZHONGHUA ZHONG LIU ZA ZHI [CHINESE JOURNAL OF ONCOLOGY] 1981; 3:284-6. [PMID: 7341182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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217
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Guo JA, Li GM, Zhao WG, Tang FZ, Zhang X, Zhang CY. [Cardiovascular effects of sodium selenite (author's transl)]. ZHONGGUO YAO LI XUE BAO = ACTA PHARMACOLOGICA SINICA 1981; 2:93-7. [PMID: 6461221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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218
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Zhang CY. [Replantation of completely severed distal digit by primary suture: observations on 49 digits (author's transl)]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1980; 18:264-5. [PMID: 7009099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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