7001
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Zhang X, Gonis A, MacLaren JM. Real-space multiple-scattering theory and the electronic structure of systems with full or reduced symmetry. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:3694-3710. [PMID: 9992340 DOI: 10.1103/physrevb.40.3694] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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7002
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Zhang X, Segawa T. Investigation of rat striatal dopamine D-1 receptors solubilized by digitonin with a precipitation method. Eur J Pharmacol 1989; 166:401-10. [PMID: 2680521 DOI: 10.1016/0014-2999(89)90352-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
[3H]SCH 23390 binding sites solubilized from rat striatal membranes by the detergent digitonin were investigated by using a polyethylene glycol precipitation method to separate the bound [3H]SCH 23390 from the free [3H]SCH 23390. The binding of [3H]SCH 23390 to the solubilized preparations was specific and saturable with a KD of 4.99 +/- 0.03 nM and a Bmax of 619 +/- 13 fmol/mg protein. The rank order of potency of dopamine agonists and antagonists for competing with [3H]SCH 23390 binding for the solubilized preparations was appropriate for dopamine D-1 receptors. The competition of SCH 23390 and S(-)-SCH 23388 with [3H]SCH 23390 binding for the solubilized preparations was stereoselective. However, the sensitivity of the dopamine agonist high-affinity binding to guanine nucleotide GTP was almost lost upon digitonin solubilization. Preincubating the membranes with dopamine preserved the guanine nucleotide sensitivity of agonist binding for membranes in solubilized preparations. These results proved that the polyethylene glycol precipitation method can be used for assay of digitonin-solubilized dopamine D-1 receptors in rat striatum.
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7003
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Zhang X, Silva E, Gershenson D, Hung MC. Amplification and rearrangement of c-erb B proto-oncogenes in cancer of human female genital tract. Oncogene 1989; 4:985-9. [PMID: 2569708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
There are two genes related to the v-erb B oncogene in the human genome. The c-erb B-1 gene encodes the epidermal growth factor receptor (EGF-r), and the c-erb B-2/neu gene encodes a receptor-like protein very similar to, but distinct from the EGF-r. Southern blot analysis of DNAs from 15 fresh human ovarian carcinomas showed that the c-erb B-2/neu gene was amplified in 3 tumors. The c-erb B-1/EGF-r gene was not amplified. However, in one case of adenocarcinoma of uterine endometrium, the c-erb B-1/EGF-r was found to be rearranged in the 5' region of this gene. The genomic structure of the rearranged c-erb B-1/EGF-r gene is similar to those found in the chicken v-erb B oncogene, which produces a truncated form of the EGF-r. The results suggest that amplification of the c-erb B-2/neu gene may play a role in the pathogenesis of ovarian carcinoma. Further, the human c-erb B-1/EGF-r gene in adenocarcinoma of uterine endometrium may be activated by a similar mechanism as that in the chicken v-erb B oncogene.
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7004
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Martin K, Kong TH, Renehan W, Schurr A, Dong W, Zhang X, Fogel R. Identification and function of brain stem neurons regulating rat ileal water absorption. THE AMERICAN JOURNAL OF PHYSIOLOGY 1989; 257:G266-73. [PMID: 2475033 DOI: 10.1152/ajpgi.1989.257.2.g266] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The central nervous system (CNS) regions regulating ileal water and ion absorption are unknown. We determined 1) the CNS origin of brain stem neurons that directly innervate the rat ileum, and 2) that these neurons influence intestinal water absorption. Horseradish peroxidase (HRP) was injected into the muscle layer of the rat ileum. The brains were examined for HRP reaction product (HRPRP) 3, 5, or 7 days later. Only cell bodies of the dorsal motor nucleus of the vagus (DMNV) were labeled. Unilateral cervical vagotomy prevented deposition in the ipsilateral DMNV. To determine whether the DMNV regulates ileal water absorption, electrical and chemical stimulation (30 microA, 4 Hz, 0.2 ms, and 300 pmol L-glutamate every 5 min, respectively) were used. Both the DMNV and the adjacent nucleus tractus solitarius (NTS) were stimulated, causing a reduction in water absorption. Bilateral vagotomy prevented the effect of bilateral electrical stimulation, but unilateral vagotomy did not prevent the decrease due to ipsilateral stimulation. These studies show that 1) the DMNV innervates the ileum, and 2) alteration of vagal efferent activity by stimulation of the DMNV and NTS reduces ileal water absorption.
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7005
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Zhang X, Ma XJ, Zhang TH. [Plasma level of cyclic nucleotides in patients with congestive heart failure and their clinical significance]. ZHONGHUA XIN XUE GUAN BING ZA ZHI 1989; 17:213-5, 253-4. [PMID: 2560704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Plasma concentrations of cyclic nucleotides were determined by radioimmunoassay in 196 cardiac patients. The results showed that plasma concentrations of cyclic AMP and cyclic GMP increased with the deterioration of cardiac function. Plasma cyclic GMP concentrations were correlated positively to the cardiothoracic ratios (CTR), PEP/LVET, and the intracardiac diameters measured by echocardiography respectively (r = 0.55 r = 0.50, and r = 0.55, P less than 0.001), and were correlated negatively to the left ventricular ejection fractions (LVEF) and LV short axis shortenings (LVSAS) (r = -0.53 and r = -0.50 respectively, P less than 0.001). There were only weak correlations between plasma cyclic AMP concentrations and CTR, PEP/LVET ratios, LVEF and LVSAS (r = 0.35, r = 0.38, r = 0.28, and r = -0.31, respectively, P less than 0.01). The correlations between plasma cyclic GMP concentrations and mean pulmonary artery pressures (r = 0.48, P less than 0.05) and mean left atrial pressures (r = 0.55, P less than 0.01) were also significant. In patients who had received cardioversion and valve replacement, plasma cyclic GMP concentrations decreased significantly. Thus the plasma concentrations of cyclic nucleotides could be used as a useful parameter in evaluation of cardiac function and therapeutic effect.
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7006
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Gonis A, Zhang X, Nicholson DM. Multiple-scattering Green-function method for space-filling cell potentials. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:947-965. [PMID: 9991914 DOI: 10.1103/physrevb.40.947] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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7007
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Zhang X, Segawa T. Selective blockade of dopamine D-1 receptor by SCH 23390 affects dopamine agonist binding to 3H-spiperone labeled D-2 receptors in rat striatum. JAPANESE JOURNAL OF PHARMACOLOGY 1989; 50:333-45. [PMID: 2569545 DOI: 10.1254/jjp.50.333] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
This study investigated the effects of selective blockade of dopamine D-1 receptors by SCH 23390 and selective stimulation of the receptors by SKF 38393 on the binding characteristics of 3H-spiperone labeled D-2 receptors in rat striatum. Selective blockade of D-1 receptors by 50 nM SCH 23390 significantly decreased the affinity of dopamine agonist for 3H-spiperone labeled D-2 receptors, but did not influence dopamine antagonist binding to D-2 receptors. Selective stimulation of D-1 receptors by SKF 38393 (100 nM) did not affect either dopamine agonist or antagonist binding to D-2 receptors. The characteristics of the effect of SCH 23390 on dopamine agonist binding to D-2 receptors was similar to those of GTP, but different from those of sodium ion. This effect could not be due to a direct modification of D-2 receptors by SCH 23390. Pertussis toxin (IAP) treatment significantly decreased the affinity of dopamine agonist for D-2 receptors and reduced the abilities of both SCH 23390 and GTP to decrease the affinity of dopamine agonist for D-2 receptors. These results suggest, therefore, putative interregulatory mechanism between dopamine D-1 and D-2 receptors and the possible involvement of a pertussis toxin sensitive protein in this mechanism.
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7008
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Shen WF, Gong LS, Zhang JS, Cui LQ, Zhang X, Zheng AF, Tang AR, Yang HJ, Ju LF. Value of angina pectoris after myocardial infarction in predicting extent of coronary artery disease. Chin Med J (Engl) 1989; 102:529-32. [PMID: 2517069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Clinical, hemodynamic, and angiographic data were examined in 53 patients who underwent catheterization within 6 months of documented acute transmural myocardial infarction (MI). The patients were divided into two groups on the basis of presence (23 patients, group I) or absence (30 patients, group II) of angina pectoris 1 month after MI. Group I patients had more severe coronary artery disease and a greater prevalence of multivessel disease than group II patients. Partial preservation of segmental left ventricular wall function in group I was related to the presence of collateral vessels. In patients with single vessel disease, incidence of spontaneous recanalization of the infarct-related artery was more common in group I as compared with those in group II. It is concluded that angina pectoris after MI suggests multivessel disease or infarct-related artery recanalization. Coronary angiography may be advised in these patients in order to select adequate therapeutic interventions and improve prognosis.
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7009
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Zhang X, Armstrong DT. Effects of follicle-stimulating hormone and ovarian steroids during in vitro meiotic maturation on fertilization of rat oocytes. GAMETE RESEARCH 1989; 23:267-77. [PMID: 2506113 DOI: 10.1002/mrd.1120230304] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The present study examined the effects of gonadotropins and ovarian steroids during in vitro meiotic maturation of rat oocytes on their ability to undergo in vitro fertilization. Fully grown oocytes were isolated from antral follicles of immature rats and cultured as oocyte-cumulus cell complexes (OCC) under conditions in which completion of meiotic maturation occurs spontaneously. They were then exposed to spermatozoa under conditions in which oocytes matured in vivo exhibit high fertilization rates. Compared with oocytes from pregnant mare's serum gonadotropin (PMSG) or follicle-stimulating hormone (FSH)-treated rats, a similar proportion of the oocytes (greater than 80%) from untreated rats underwent germinal vesicle breakdown, but such oocytes had a lower rate of fertilization (70% vs. 20%). The presence of FSH during in vitro maturation restored the fertilization rate for oocytes from untreated rats, while a cytochrome P450 inhibitor, aminoglutethimide phosphate abolished this beneficial effect of FSH. The addition of progesterone during the in vitro maturation period duplicated the beneficial effect of FSH on fertilization rate of oocytes from untreated rats; oestradiol-17 beta was less effective in this regard, and 5 alpha-dihydrotestosterone was ineffective. These findings indicate that FSH and progesterone, although having no apparent effect on nuclear maturation of the oocyte, play an important role during oocyte maturation in enabling normal fertilization to occur.
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7010
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Lu G, Young BL, Zhang X, Wan L. New tripreon models with semisimple metacolor groups. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1989; 40:223-230. [PMID: 10011674 DOI: 10.1103/physrevd.40.223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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7011
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Klinger K, Zhang X, Rheda F, Gerber P, Decurtins M, Uhlschmid G, Häcki W, Stamm B, Largiadèr F. [Experimental pancreatic duct occlusion with polyurethane]. HELVETICA CHIRURGICA ACTA 1989; 56:189-93. [PMID: 2674061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Pancreatic transplantation requires an effective method to manage exocrine secretion. A new technique to eliminate the exocrine function of the pancreas by obstruction of the duct with polyurethane was investigated in terms of function, outcome and morphology. Polyurethane is an alcoholic solution of block copolymers with the property of polymerizing within 5-10 min. In this study the in-situ pancreatic tail model in dogs was utilized, the pancreatic duct was cannulated and injected with 2-3 ml of polyurethane. As a result, complete atrophy and fibrosclerosis of the exocrine tissue was obtained leaving islets well vascularized and functioning for the entire experimental periods. All animals remained normoglycemic and showed normal K-values. Amylase levels were found to be maximally elevated at 24 h and returned to normal within 2 weeks after duct occlusion. Insulin, glucagon and somatostatin levels remained normal. Because of its ability to effect a complete occlusion of the pancreatic ducts with subsequent atrophy of the exocrine gland and without notable disturbance of endocrine function, we feel that polyurethane solution is superior to previously used materials for this purpose.
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7012
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Mulhollan GA, Zhang X, Dunning FB, Walters GK. Role of rediffused primary electrons in secondary-electron ejection from a Cu(100) surface. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 39:8715-8717. [PMID: 9947587 DOI: 10.1103/physrevb.39.8715] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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7013
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Zhang X, Gonis A. New, real-space, multiple-scattering-theory method for the determination of electronic structure. PHYSICAL REVIEW LETTERS 1989; 62:1161-1164. [PMID: 10039592 DOI: 10.1103/physrevlett.62.1161] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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7014
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Zhang SM, Wu M, Chen H, Zhang X. Changes of glycoconjugates in human hepatocellular carcinoma. HISTOCHEMISTRY 1989; 92:171-5. [PMID: 2548984 DOI: 10.1007/bf00490238] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Receptors of 12 lectins in 25 cases of human hepatocellular carcinomas (HCC) were histochemically investigated by avidin-biotin-peroxidase complex (ABC) method. Liver tissues of five cirrhotic patients and five normal subjects were used as controls. SJA receptor was absent both in HCC and controls, while LCA and PSA receptors were present in all tissues studied here. Receptors of DBA, PHA, PNA, UEAI and SBA which did not bind to normal, cirrhotic and pericarcinomatous liver tissues had the positive rates of 4%, 44%, 16%, 4% and 12% in HCC, respectively. Four lectins which strongly bound to the non-cancer liver tissues had their receptors in 96% (ConA, WGA, RCAI) and 36% (BSAI) of HCC. The pretreatment of tissue sections with neuraminidase abolished most of WGA receptors and exposed some PNA binding sites. There were many differences in lectin distribution between HCC and noncancer liver tissues. The changes of glycoconjugates in HCC were discussed.
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7015
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Langford A, Pohle HD, Gelderblom H, Zhang X, Reichart PA. Oral hyperpigmentation in HIV-infected patients. ORAL SURGERY, ORAL MEDICINE, AND ORAL PATHOLOGY 1989; 67:301-7. [PMID: 2927925 DOI: 10.1016/0030-4220(89)90360-5] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Six cases of oral hyperpigmentation in HIV-infected patients are reported. While in two patients the lesions could be related to systemic clofazimine or ketoconazole therapy, in the other patients the cause remained unknown. Clinically, the pigmentations were characterized by a sudden onset and the appearance of well-defined, brown-black macules in the buccal mucosa, the gingiva, the hard palate, or the lateral borders of the tongue. In one patient, longitudinal hyperpigmented striae were observed on all fingernails and toenails. Histologically, hyperpigmentations associated with systemic medication revealed accumulation of melanin in phagocytes and extracellularly within the connective tissue. In those lesions with unknown cause, melanin was restricted to keratinocytes of the basal cell layer or to extracellular foci in the lamina propria. The clinical and histologic findings, as well as differential diagnosis, are discussed.
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7016
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Zhang X, Miller B. Effects of pregnancy and exogenous progesterone on immunosuppressive activity in the uterus and peripheral plasma of the ewe. Anim Reprod Sci 1989. [DOI: 10.1016/0378-4320(89)90057-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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7017
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Zhang X, Hou FF. [Advances in hemopurification therapy in acute kidney failure]. ZHONGHUA YI XUE ZA ZHI 1989; 69:176-8. [PMID: 2673489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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7018
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Duperray C, Klein B, Durie BG, Zhang X, Jourdan M, Poncelet P, Favier F, Vincent C, Brochier J, Lenoir G. Phenotypic analysis of human myeloma cell lines. Blood 1989; 73:566-72. [PMID: 2537114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Multiple myeloma (MM) is a B-cell malignancy characterized by the accumulation, primarily in bone marrow, of a clone of plasma cells. The nature of the stem cells feeding the tumoral compartment is still unknown. To investigate this special point, we have studied the phenotypes of nine well-known human myeloma cell lines (HMCLs) and compared them with those of normal lymphoblastoid cell lines (LCLs). Twenty-four clusters of differentiation involved in B lymphopoiesis were investigated using a panel of 65 monoclonal antibodies (MoAbs). For each cluster, the percentage of positive cells and the antigen density were determined, giving rise to a "quantitative phenotype". We thus classified the HMCLs into two different groups: those with cytoplasmic mu chains (c mu+) and those without (c mu-). In the first (c mu+) group, comprising seven cell lines, the HMCLs had a phenotype of pre-B/B cells close to that of Burkitt's lymphoma cell lines. They expressed low densities of surface mu chains, without detectable cytoplasmic or surface light chains. Three of them were infected with the Epstein Barr virus (EBV). These c mu+ HMCLs bore most of the B-cell antigens except CD23. They expressed the CALLA antigen (CD10) and lacked the plasma-cell antigen PCA1. In contrast, LCLs expressed surface light chains, high densities of CD23, low densities of PCA1 antigen, and no CD10 antigen. The c mu- HMCLs had a plasma-cell phenotype, lacking most of the B-cell antigens and expressing high densities of PCA1 antigen.(ABSTRACT TRUNCATED AT 250 WORDS)
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7019
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Zhang X, Armstrong D. Fertilization of rat oocytes is enhanced by FSH during in vitro maturation of oocyte-cumulus complexes. Theriogenology 1989. [DOI: 10.1016/0093-691x(89)90685-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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7020
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Klingler K, Zhang X, Menghini T, Metzger U, Largiadèr F. [Effect of blood transfusions on the survival of patients with colorectal cancers]. HELVETICA CHIRURGICA ACTA 1989; 55:685-8. [PMID: 2715032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Blood transfusion is reported to cause immunosuppression. An adverse relationship between perioperative blood transfusions and the risk of subsequent recurrence of cancer was reported recently. We reviewed the records of 282 patients and analyzed the interaction between blood tranfusion and the outcome of Dukes stages A, B and C colorectal cancers treated by radical resection during the years 1978-1985. 53 of these patients did not receive any blood transfusions. The actuarial survival analysis (Cutler and Ederer) showed no significant difference for the overall and recurrence-free survival. This study did not support the hypothesis that blood transfusions had an adverse effect on survival of patients with colorectal cancer.
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7021
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Zhang X, Miller BG, Stone GM. Protein secretion by the endometrium during pregnancy in the ewe. Reprod Fertil Dev 1989; 1:15-30. [PMID: 2496436 DOI: 10.1071/rd9890015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Mature Merino ewes were surgically prepared so that after mating they became unilaterally pregnant. Ewes were killed between days 91 and 124 of pregnancy and the uterine milk was collected from the ligated uterine horn. Explants of intercaruncular and intercotyledonary endometrium were collected from the ligated and unligated uterine horns, respectively, and incubated in the presence of L-[4,5-3H]leucine to determine in vitro rates of protein synthesis and secretion. Protein:DNA and DNA:wet tissue ratios were also determined in the explants from some ewes. The proteins secreted in vitro and those present in uterine milk were partially characterized, using several procedures. Antisera raised in rabbits against uterine milk and absorbed against plasma from an ovariectomized ewe were used to detect uterine milk antigens in a variety of tissues and plasma. An average of 150 +/- 26 mL of creamy coloured uterine milk containing 30.7 +/- 4.6 mg mL-1 protein was recovered from 14 ewes. The rates of protein synthesis and secretion in vitro and the protein:DNA ratio were all higher in intercotyledonary than in intercaruncular endometrium, but the predominant radiolabelled protein(s) secreted in vitro by both types of endometrium was shown by gel filtration to have a molecular weight of approximately 60 kDa. This 'uterine pregnancy protein' was not secreted by endometrial explants from a non-pregnant ewe. Uterine milk contained a substantial amount of 60 kDa protein. The molecular weight and lack of sub-unit structure of the 60 kDa fraction of proteins secreted in vitro was confirmed by SDS-acrylamide electrophoresis and density gradient centrifugation. Pronase treatment confirmed the proteinaceous nature of the 60 kDa fraction, and heparin-Sepharose affinity chromatography showed that the predominant secreted protein(s) in this fraction was a glycoprotein. In immuno-double-diffusion tests antisera prepared against uterine milk produced a number of precipitation bands against both uterine milk and culture medium (after incubation of endometrial explants from a pregnant ewe) and a single band against allantoic fluid, but did not react with plasma from an ovariectomized ewe or a day-124 pregnant ewe or its fetus. The antisera did not react with lung, kidney or liver from the same pregnant ewe or with uterine flushings from a non-pregnant ewe. In immuno-electrophoresis tests, at least eight distinct antigens were detected in uterine milk and three of these were also present in allantoic fluid.
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7022
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Zhang X, Langford A, Gelderblom H, Reichart P. Ultrastructural findings in clinically uninvolved oral mucosa of patients with HIV infection. J Oral Pathol Med 1989; 18:35-41. [PMID: 2746516 DOI: 10.1111/j.1600-0714.1989.tb00730.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Twelve biopsies of clinically normal oral mucosa taken from HIV seropositive patients have been investigated by means of light- and electron microscopy. Vascular abnormalities were found in all biopsies, regardless of the clinical stage of the HIV infection. In particular slit-like vascular channels, sparseness of intercellular junctions and swollen, protruded endothelial cells with an increased quantity of Weibel-Palade bodies were noticed. These findings were similar to those described in lesions of early stage Kaposi's sarcoma.
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7023
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Zhang X, Stone GM, Miller BG. In vitro binding of progesterone, cronolone and medroxyprogesterone acetate to uterine progesterone receptors of sheep, rabbit and mouse. Reprod Fertil Dev 1989; 1:223-30. [PMID: 2479058 DOI: 10.1071/rd9890223] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Various aspects of the binding of the synthetic progesteongens, cronolone (9 alpha-fluoro-11 beta-hydroxy-17 alpha-acetoxypregn-4-ene-3,20-dione) and medroxyprogesterone acetate (6 alpha-methyl-17 alpha-acetoxypregn-4-ene-3,20-dione, MAP) to uterine cytosol progesterone receptors of the sheep, rabbit and mouse were studied, in an attempt to explain interesting species differences in the biological activity of these steroids. For the sheep, data for binding-site concentration, relative binding affinity (RBA), dissociation constant (Kd) and rates of association and dissociation indicate specific binding of cronolone to the progesterone receptor and these would seem to explain in part the high progestational activity of cronolone in this species. By contrast, with the mouse, there was only a low level of specific binding of cronolone and this appears to explain its inability to maintain pregnancy in this species. Results for the binding activity of cronolone in rabbit uterus were similar to those for the sheep and thus inability of cronolone to maintain pregnancy in the rabbit is not explained by a failure to bind the progesterone receptor. Species differences in binding to the progesterone receptor were also seen with MAP where the RBA, with respect to progesterone, was high in the sheep and rabbit and lower in the mouse. The results, however, do not relate directly to the progestational activity of MAP in these species. Overall, the data indicate that species differences in the binding activity of steroid receptors constitute one factor that causes species-dependent variation in biological responses to progestogens.
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7024
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Zhang X, Miller BG. Some biological activities of cronolone and medroxyprogesterone acetate in the uterus of the sheep, mouse and rabbit. Reprod Fertil Dev 1989; 1:157-69. [PMID: 2477875 DOI: 10.1071/rd9890157] [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: 01/01/2023] Open
Abstract
Cronolone (9 alpha-fluoro-11 beta-hydroxy-17 alpha-acetoxypregn-4-ene-3,20-dione) is widely employed to regulate breeding activity in the ewe, but its biological activity in the uterus of this and most other species has not been studied. In this study several in vivo uterus-related activities of cronolone have been examined in the sheep, mouse and rabbit. In some experiments the corresponding activities of medroxyprogesterone acetate (6 alpha-methyl-17 alpha-acetoxypregn-4-ene-3,20-dione, MAP) were also examined. Cronolone maintained pregnancy in ovariectomized ewes but not in ovariectomized mice and rabbits; it terminated pregnancy in some mice and in all rabbits that were receiving daily progesterone treatment. Cronolone could not sensitize the mouse uterus for the induction of the decidual-cell reaction or block the induction of such sensitivity by progesterone, but did support limited growth of the oil-stimulated horn after sensitization with progesterone. Cronolone induced uteroglobin secretion by rabbit endometrium. It was concluded that, whereas MAP is a potent progestogen in the sheep, mouse and rabbit, cronolone is a progestogen in the sheep and rabbit only. In the mouse and especially the rabbit, cronolone has other, non-progestational activities, which block pregnancy.
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7025
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Hung MYY, Long KW, Zhang X, Hovanesian JD., Hathaway R. Fast Detection Of Residual Stresses By Shearography. ACTA ACUST UNITED AC 1988. [DOI: 10.1117/12.947662] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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