7351
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Lu RK, Liu Y, Chen HY, Zhang L, He YY, Zhong W. [Luteinizing hormone-releasing hormone (LRH) agonist in the treatment of breast cancer, osteosarcoma and prostate carcinoma--analysis of 12 patients]. ZHONGHUA ZHONG LIU ZA ZHI [CHINESE JOURNAL OF ONCOLOGY] 1988; 10:70-2. [PMID: 3046877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
This paper first reports the results of 12 patients with sex hormone-dependent neoplasms, including 9 women with breast cancer, 2 men with osteosarcoma and 1 man with prostate carcinoma, treated by LRH agonist, (D-Ala6, des-Gly-NH2(10))-LRH-ethylamide (LRH-A) 100-200 micrograms, IM, QD. After 15-30 days of administration, the concentrations of plasma mean estradiol, progesterone, testosterone, serum luteinizing hormone and follicle-stimulating hormone were lowered significantly in the peripheral blood of all patients, associating with improvement of the patients' general condition and reduction of the tumors and/or metastatic foci. No serious side effects were observed except vaginal irregular bleeding in isolated patients. Three patients died and the others were alive in follow-up of 4-30 months. The results suggest that LRH-A be useful in the treatment of the sex hormone-dependent tumors and worth further study.
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7352
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Rifkind JM, Zhang L, Heim JM, Levy A. The role of hemoglobin in generating oxyradicals. BASIC LIFE SCIENCES 1988; 49:157-62. [PMID: 2854980 DOI: 10.1007/978-1-4684-5568-7_23] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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7353
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Zhang L, Rado GT. Ferromagnetic resonance method for determining the magnetic surface anisotropy of amorphous films. PHYSICAL REVIEW. B, CONDENSED MATTER 1987; 36:7071-7077. [PMID: 9942431 DOI: 10.1103/physrevb.36.7071] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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7354
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Zhang L, Zhang JT. [Memory facilitation induced by Panax ginseng and pseudoginseng in mice]. ZHONG XI YI JIE HE ZA ZHI = CHINESE JOURNAL OF MODERN DEVELOPMENTS IN TRADITIONAL MEDICINE 1987; 7:610-2, 582. [PMID: 3447763] [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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7355
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Clark DD, Lambert ML, Zhang L. NETBLT: a high throughput transport protocol. ACM SIGCOMM COMPUTER COMMUNICATION REVIEW 1987. [DOI: 10.1145/55483.55520] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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7356
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Zhang L, Bird RP, Bruce WR. Proliferative activity of murine mammary epithelium as affected by dietary fat and calcium. Cancer Res 1987; 47:4905-8. [PMID: 3621183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Dietary fat and calcium have been found to affect significantly the proliferative status of the mammary glands. Female mice (3-week-old C57BL/6J) were given either a low or high corn oil diet (3 or 30% by weight). One, 2, or 4 weeks after the dietary intervention the animals were given injections of [3H]thymidine and/or colchicine; 2 h later their thoracic mammary glands were removed and processed for histology and autoradiography. Animals on the high corn oil diet had an increased labeling index of both terminal ducts and mature ducts compared to the control group at each time (i.e., 10.1 +/- 2.1 versus 4.8 +/- 0.9% at 2 weeks). This effect of a high corn oil diet was evident on the mammary glands of animals at various ages. Animals on a high beef tallow diet also had a high labeling index. This effect of a high fat diet appeared to be reduced by dietary calcium. The labeling index for terminal ducts of animals on high corn oil diet decreased from 14.1 +/- 3.8, 11.9 +/- 3.4 to 8.5 +/- 1.8 and high beef tallow from 13.6 +/- 3.6, 11.4 +/- 0.7 to 9.5 +/- 1.3 for calcium levels of 0.1, 0.5, and 1.0%, respectively. Mitotic indices followed the same trend. These studies demonstrate that a high fat diet affects the proliferative status in the mouse mammary glands in a short period of time and that this effect can be reduced by dietary calcium.
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7357
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Zhang L, Zhao WK, Wan SY. [Effect of a yiqi congming decoction on the central nervous system in reserpinized mice]. ZHONG XI YI JIE HE ZA ZHI = CHINESE JOURNAL OF MODERN DEVELOPMENTS IN TRADITIONAL MEDICINE 1987; 7:477-80, 454. [PMID: 2830040] [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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7358
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Borowiec JA, Zhang L, Sasse-Dwight S, Gralla JD. DNA supercoiling promotes formation of a bent repression loop in lac DNA. J Mol Biol 1987; 196:101-11. [PMID: 3656441 DOI: 10.1016/0022-2836(87)90513-4] [Citation(s) in RCA: 210] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Titration experiments on supercoiled lac DNA show that one repressor tetramer can bind simultaneously to the primary lac operator and to the very weak lac pseudo-operator, located 93 base-pairs apart. The formation of this complex is accompanied by the appearance of an extreme hypersensitive site in a five base-pair sequence located approximately midway between the operators. This remote sequence is hypersensitive to attack by two different chemical probes, dimethyl sulfate and potassium permanganate, the latter of which is a new probe for distorted DNA. We interpret these results in terms of a complex in which lac repressor holds two remote operators together in a DNA loop. The formation of this bent DNA loop requires negative DNA supercoiling. In vivo, both lac operators bind repressor even though the presence of multiple operator copies has forced the two operators to compete for a limited amount of repressor. This suggests that the operator and pseudo-operator have similar affinities for repressor in vivo. Such similar affinities were observed in vitro only when DNA supercoiling forced formation of a repression loop.
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7359
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Zhang L, Mock D. Gamma-glutamyl transpeptidase activity during carcinogenesis of hamster buccal pouch epithelium. Carcinogenesis 1987; 8:977-81. [PMID: 2885101 DOI: 10.1093/carcin/8.7.977] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Gamma-glutamyl transpeptidase (GGT) activity has been demonstrated histochemically in a number of experimentally induced neoplasms and has been suggested as a label for potential precursors for the development of squamous cell carcinomas. This study explores the kinetics of GGT-stained cell populations, their correlation with the hypothesized initiated cells and evidence of malignant transformation of epithelium in hamster buccal pouch by a 15-week regime of tri-weekly topical application of 7, 12-dimethylbenz[a]anthracene (DMBA) in mineral oil. GGT-positive foci were detected histochemically in tissue sections as early as 1 week after application of the carcinogen, when there was no morphological evidence of dysplasia. The average number of the GGT-positive foci in each experimental period was found to increase with time. Even though the majority of the foci were small, consisting of only a single cell or a small group of cells, a few larger GGT-positive lesions were noted, particularly in the later period of the experiment. A total of 66 grossly visible neoplasms were found. Thirty-seven of these were submitted for GGT staining. Thirty-two (86.5%) of these showed patchy GGT activity, primarily in the superficial epithelial cells and/or the keratin. In the non-neoplastic epithelium, the GGT staining could involve any or all layers of cells. GGT activity was not detected in untreated or mineral oil-treated mucosa. The results of this study support the hypothesis that GGT activity may label potential precursors for the development of squamous cell carcinomas.
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7360
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Zhang L, Krnjević K. Effects of intracellular injections of phorbol ester and protein kinase C on cat spinal motoneurons in vivo. Neurosci Lett 1987; 77:287-92. [PMID: 2441327 DOI: 10.1016/0304-3940(87)90514-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
In cat spinal motoneurons intracellular iontophoresis of phorbol 12, 13-diacetate or protein kinase C increases the afterhyperpolarization, the maximum rate of spike rise and the spike peak amplitude, without evident change in resting potential, input resistance and monosynaptic excitatory postsynaptic potential. Phorbol ester also reduces the accommodation of repetitive discharge evoked by intracellular current pulses. These data suggest that activation of protein kinase C facilitates the Ca2+-activated K+ current that mediates the afterhyperpolarization, as well as the fast Na+ current. These effects are quite different from those seen in some other mammalian central neurons.
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7361
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He MC, Hun SM, Zhang L, Lian CH. In vitro alterations of tracheal epithelium of hamsters by carcinogens in organ culture. TOHOKU J EXP MED 1987; 152:87-100. [PMID: 3617062 DOI: 10.1620/tjem.152.87] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
In vitro organ culture of the hamster's trachea was improved and applied to a carcinogenesis research. The rotary culture enabled explants of tracheal epithelium to survive more than 8 weeks. The study was composed of 2 kinds of culture; untreated and treated with carcinogens. In the untreated culture, Eagle MEM medium had the same culture effect as RPMI 1640 medium. With prolongation of culture time (particularly longer than 5 weeks), irreversible degenerative changes appeared in epithelial cells. Culture for 4 weeks was usually thought to be appropriate for experimental research. In the treated culture, the effect of benzo-(a) pyrene (B(a)P) and B(a)P + cigarette smoking condensate-neutral fraction (CSC-NF) on tracheal epithelium was investigated with light and electron microscopies (TEM and SEM) and autoradiography. Atypical hyperplasia with or without lesions suggesting carcinoma in situ was induced by B(a)P + CSC-NF more evidently and frequently than by B(a)P alone. The present findings corroborated the cocarcinogenetic effect of CSC-NF.
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7362
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Zhang L, Zhong CG. [Studies on the role of residual microfilaremia in Bancroftian filariasis transmission in controlled areas]. ZHONGHUA LIU XING BING XUE ZA ZHI = ZHONGHUA LIUXINGBINGXUE ZAZHI 1987; 8:96-100. [PMID: 3304654] [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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7363
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Zhang L, He MC. [In vitro studies on the cocarcinogenic activity of CSC-NF to the tracheal epithelium of hamsters]. ZHONGHUA YI XUE ZA ZHI 1987; 67:184-6, 12. [PMID: 3115509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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7364
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Zhou Y, Zhang L. [The origin and biological significance of reticular fiber in the stroma of cervical carcinoma]. ZHONGHUA BING LI XUE ZA ZHI = CHINESE JOURNAL OF PATHOLOGY 1987; 16:47-9. [PMID: 2957081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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7365
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Zhang L, Krnjević K. Apamin depresses selectively the after-hyperpolarization of cat spinal motoneurons. Neurosci Lett 1987; 74:58-62. [PMID: 2436107 DOI: 10.1016/0304-3940(87)90051-6] [Citation(s) in RCA: 88] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Extra- (but not intra-) -cellularly applied apamin depresses selectively the after-hyperpolarization (AHP) of cat spinal motoneurons in situ, while causing only a slight depolarization and minor changes in size and shape of the action potential. Apamin increases firing evoked by long depolarizing current pulses. These results indicate that the Ca2+-dependent K conductance underlying the AHP is sensitive to apamin, and that this conductance is likely to have a physiological role in the control of motoneuronal firing.
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7366
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Yu SY, Zhang L. [Determination of serum copper and ceruloplasmin levels in patients with cervical cancer]. ZHONGHUA FU CHAN KE ZA ZHI 1987; 22:15-7, 61. [PMID: 3595303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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7367
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Bidwai AP, Zhang L, Bachmann RC, Takemoto JY. Mechanism of Action of Pseudomonas syringae Phytotoxin, Syringomycin : Stimulation of Red Beet Plasma Membrane ATPase Activity. PLANT PHYSIOLOGY 1987; 83:39-43. [PMID: 16665211 PMCID: PMC1056295 DOI: 10.1104/pp.83.1.39] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Syringomycin, a peptide toxin produced by the phytopathogen Pseudomonas syringae pv syringae preferentially stimulated (2-fold) the vanadate-sensitive ATPase activity associated with the plasma membrane of red beet storage tissue. The toxin had a very slight effect on the tonoplast ATPase and had no detectable effect on the mitochondrial ATPase. Optimal stimulation was achieved with 10 to 50 micrograms of syringomycin per 25 micrograms of membrane protein. Treatment of membranes with 0.1% (weight/volume) deoxycholate eliminated the activation effect, and enzyme solubilized with Zwittergent 3-14 was not affected by syringomycin. ATPase activity was activated to the same extent at KCl concentrations ranging from 0 to 50 millimolar. Valinomycin, nigericin, carbonylcyanide p-trifluoromethoxyphenylhydrazone, and gramicidin did not increase the plasma membrane ATPase activity. However, these ionophores did not hinder the ability of syringomycin to stimulate the activity. We suggest that syringomycin does not increase ATPase activity by altering membrane ion gradients nor directly interacting with the enzyme, but possibly through regulatory effectors or covalent modification of the enzyme.
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7368
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Lu B, Zhang L, Deng YH. [Preparation of capsules of microencapsulated indomethacin and their bioavailability in rabbits]. HUA XI YI KE DA XUE XUE BAO = JOURNAL OF WEST CHINA UNIVERSITY OF MEDICAL SCIENCES = HUAXI YIKE DAXUE XUEBAO 1986; 17:328-31. [PMID: 3570271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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7369
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Zhang L, Krnjević K. Effects of 4-aminopyridine on the action potential and the after-hyperpolarization of cat spinal motoneurons. Can J Physiol Pharmacol 1986; 64:1402-6. [PMID: 2431750 DOI: 10.1139/y86-237] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
In cats under pentobarbital anaesthesia, intramotoneuronal administrations of 4-aminopyridine significantly prolong the falling phase of the antidromic action potential but have much less effect on the orthodromic action potential. 4-aminopyridine probably blocks the fast K channels involved in the repolarization of the membrane and indirectly activates ionic channels through enhancement of synaptic transmission, also suggested by the potentiation of excitatory postsynaptic potentials. In many cells, 4-aminopyridine depresses the amplitude and prolongs the time course of the after-hyperpolarization; therefore 4-aminopyridine may also partly block Ca2+-activated K+ channels.
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7370
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Zhang L, Chen ZW. [Further research on nerve regeneration of motor endplates in animals]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1986; 24:662-3, 699. [PMID: 3568877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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7371
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Zhang L. [Effect of pollen typhae on 6-keto-PGF1 alpha, TXB2, TC and HDL-C in chronic hyperlipemic rabbits]. ZHONGHUA XIN XUE GUAN BING ZA ZHI 1986; 14:291-3, 319-20. [PMID: 3582146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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7372
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Zhang L, Takemoto JY. Mechanism of action of Pseudomonas syringae phytotoxin, syringomycin. Interaction with the plasma membrane of wild-type and respiratory-deficient strains of Saccharomyces cerevisiae. BIOCHIMICA ET BIOPHYSICA ACTA 1986; 861:201-4. [PMID: 3530326 DOI: 10.1016/0005-2736(86)90581-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The effects of the phytotoxin, syringomycin, produced by Pseudomonas syringae pv. syringae, were examined on cells of a wild-type and a respiratory-deficient (rho0) mutant of Saccharomyces cerevisiae. The growth of both strains in liquid culture was inhibited by 0.5 micrograms syringomycin per ml and higher. Uptake rates of tetraphenylphosphonium and dimethyloxazolidine ions in cell suspensions of both strains increased when 1.5 micrograms per ml syringomycin was added. These responses were kinetically and quantitatively similar in the two strains and indicated increases in electrical potential (cell interior negative) and pH differences (cell interior alkaline) across the plasma membrane. Glucose (0.1 M) enhanced the effect on the electrical potential, was required for the pH changes, and increased the cellular ATP levels. These results show that the effects of syringomycin are energy-dependent and are due to alterations of plasma membrane and not to mitochondrial function.
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7373
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Abstract
Repeated observation of TCP retransmission timer problems stimulated investigation into the roles and limitations of timers. Timers are indispensable tools in building up reliable distributed systems. However, as the experience with the TCP retransmission timer has shown, timers have intrinsic limitations in offering optimal performance. Any timeout based action is a guess based on incomplete information, and as such is bound to be non-optimal. We conclude that, if we aim at high performance, we should use external events as a first line of defense against failures, and depend on timers only in cases where external notification has failed.
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7374
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Wu SJ, Li DY, Zhang L, Du XD, Zhang YK. [Studies on the coumarins from the zou-ma-qin (Heracleum moellendorffii Hance var. Paucivitatum)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1986; 21:599-604. [PMID: 3811954] [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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7375
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Zhou Y, Zhang L. [Prognostic analysis of four pathological features in carcinoma of the uterine cervix and its clinical significance]. ZHONGHUA ZHONG LIU ZA ZHI [CHINESE JOURNAL OF ONCOLOGY] 1986; 8:276-9. [PMID: 3757743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The correlation between different pathological features of biopsy specimen and the five year survival rate of 442 patients with carcinoma of uterine cervix treated in our hospital during 1968 to 1980, were studied by means of gradual regression. The result showed that the five year survival rate was influenced, at different levels, by the pathological features. The peritumoral lymphocytic infiltration was the most significant factor influencing the prognosis. Then were the fibrous tissue reaction and the cell type but the mode of invasion was insignificant. The best regression equation to predict the prognosis of patients with carcinoma of uterine cervix was established by gradual choosing. By this equation, we could directly calculate the probability of the five year survival of the patient. It was proved by retrospective and prospective analysis that the equation could accurately reflect the real five year survival rate of patients with carcinoma of uterine cervix.
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