2501
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Li CJ, Zhan CL, Tang MY, Lu Y, Li GR, Peng XD, Li HY, Wu ZS, Zeng XM. [Optical and ultrastructural changes in the rabbit lens caused by microwaves]. HUA XI YI KE DA XUE XUE BAO = JOURNAL OF WEST CHINA UNIVERSITY OF MEDICAL SCIENCES = HUAXI YIKE DAXUE XUEBAO 1988; 19:200-3. [PMID: 3198105] [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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2502
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Lu Y, Han J, Scanlon KJ. Biochemical and molecular properties of cisplatin-resistant A2780 cells grown in folinic acid. J Biol Chem 1988; 263:4891-4. [PMID: 3258308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
In this study, A2780 human ovarian carcinoma cells were grown in folinic acid in contrast to folic acid, and the molecular and biochemical properties of cisplatin-resistant A2780 cells were analyzed for changes in the dTMP synthase cycle. At concentrations of folinic acid that were optimal for cell growth (10(-8) M), the ED50 for cisplatin was 2.5 and 43 microM in the A2780S and A2780DDP cells, respectively. Resistance to cisplatin was associated with a 2-fold cross-resistance to 5-fluorodeoxyuridine and 5-fluorouracil as well as a 3-fold increase in both dTMP synthase activity and mRNA. The ED50 for methotrexate was similar in both A2780S and A2780DDP cells (1.2 microM). When both the A2780S and A2780DDP cells were grown in folinic acid, there was no significant difference in the level of dihydrofolate reductase activity. This data would suggest that cisplatin resistance is associated with changes in folate metabolism.
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2503
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Newman EM, Lu Y, Kashani-Sabet M, Kesavan V, Scanlon KJ. Mechanisms of cross-resistance to methotrexate and 5-fluorouracil in an A2780 human ovarian carcinoma cell subline resistant to cisplatin. Biochem Pharmacol 1988; 37:443-7. [PMID: 3337743 DOI: 10.1016/0006-2952(88)90212-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Some properties of the human ovarian carcinoma line A2780 and a subline three times more resistant than the parent line to cisplatin are compared in this report. The rates of uptake and release of cisplatin were similar in the two cell lines. Resistance to cisplatin was associated with: (a) cross-resistance to 5-fluorouracil and methotrexate; (b) a 2.5-fold increase in thymidylate synthase, as measured by both enzyme activity and the capacity to complex 5-fluorodeoxyuridylate; and (c) an increase in the intracellular pools of 5,10-methylenetetrahydrofolate and tetrahydrofolate. These data suggest that cross-resistance to 5-fluorouracil and methotrexate in A2780 cells may be a consequence of increases in their respective target enzymes.
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2504
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Scanlon KJ, Lu Y, Kashani-Sabet M, Ma J, Newman E. Mechanisms for cisplatin-FUra synergism and cisplatin resistance in human ovarian carcinoma cells both in vitro and in vivo. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1988; 244:127-35. [PMID: 3247881 DOI: 10.1007/978-1-4684-5607-3_12] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Cisplatin and FUra act synergisticly in human carcinomas. An increase in the availability of reduced folates necessary for tight binding of FdUMP to thymidylate synthase (TS) contributes to the enhanced cytotoxicity of this drug combination. The human ovarian A2780 cell line made three-fold resistant to cisplatin has been shown to have a three-fold elevation of m-RNA for dihydrofolate reductase (DHFR) and TS. However, this increase did not result from an amplification of the genes for these two enzymes. In contrast, ovarian carcinoma cells from patients who failed treatment with cisplatin and FUra have been shown to have both enhanced gene expression and increased gene copy number for DHFR and TS.
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2505
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Lu YU, Ge J, Huang YT, Chu SC, Wang Z, Lu Y, Shi SM, Hu YY, Shi KC, Wang G. Successful replantation in ten-digit complete amputations. J Reconstr Microsurg 1988; 4:123-9. [PMID: 3361471 DOI: 10.1055/s-2007-1006910] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The authors report a case of successful replantation of all fingers in a ten-finger complete amputation. Among the factors responsible for the successful outcome were an adequate number of microsurgically-trained resident surgeons and staff, good organization and supervision by senior staff, emphasis on precision and perseverance in the operative procedures, and postoperative management. Follow-up is 15 months, and the patient now has a pair of functionally and cosmetically good hands.
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2506
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Zuo F, Patton BR, Cox DL, Lee SI, Song Y, Golben JP, Chen XD, Lee SY, Cao Y, Lu Y, Gaines JR, Garland JC, Epstein AJ. Influence of magnetic rare-earth ion substitution on the magnetic susceptibility of high-Tc superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1987; 36:3603-3607. [PMID: 9943290 DOI: 10.1103/physrevb.36.3603] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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2507
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Chen SS, Wang P, Lu Y. [Bone marrow growth pattern in myelodysplastic syndromes]. ZHONGHUA NEI KE ZA ZHI 1987; 26:324-6, 380. [PMID: 3652836] [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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2508
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Lu Y, Lynch SR, Cook JD, Madan N, Bayer WL. Use of capillary blood for the evaluation of iron status. Am J Hematol 1987; 24:365-74. [PMID: 3565373 DOI: 10.1002/ajh.2830240406] [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: 01/06/2023]
Abstract
The accuracy and precision of measurements of iron status made on the capillary blood from a single 75 X 1-mm microhematocrit tube were evaluated in 301 normal volunteers. After recording the hematocrit value, a hematofluorometer was used to assay erythrocyte protoporphyrin directly on the packed red cell fraction. Values in the low normal range were 50-100% higher than assays by an extraction technique in simultaneously collected venous blood. However, measurements in the iron deficient range were only 12% greater. Plasma ferritin concentration was determined by using an enzyme-linked immunoassay on 10-microliters plasma retrieved after measuring the hematocrit. Capillary values were approximately 7% higher than venous concentrations, the proportional difference being consistent throughout the measured range. When the individual measurements were combined to calculate the iron storage status of each individual, the frequency distribution of iron stores in 141 female volunteers between 18 and 36 years of age was approximately Gaussian and paralleled that calculated for women aged 18-44 years in NHANES II. These studies demonstrate that iron status can be determined accurately from the measurement of hematocrit, erythrocyte protoporphyrin, and ferritin on a single microhematocrit tube of capillary blood.
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2509
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Mu GY, Lu Y, Zhang HL, Cao ZL, Dai BM, Wang XX, Cheng SQ, Liu XM, Li CL. [A study on the therapy of leptospirosis with gentamycin]. HUA XI YI KE DA XUE XUE BAO = JOURNAL OF WEST CHINA UNIVERSITY OF MEDICAL SCIENCES = HUAXI YIKE DAXUE XUEBAO 1987; 18:82-5. [PMID: 3650196] [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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2510
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Scanlon KJ, Newman EM, Lu Y, Priest DG. Biochemical basis for cisplatin and 5-fluorouracil synergism in human ovarian carcinoma cells. Proc Natl Acad Sci U S A 1986; 83:8923-5. [PMID: 3466165 PMCID: PMC387045 DOI: 10.1073/pnas.83.23.8923] [Citation(s) in RCA: 238] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
The human ovarian cell line A2780 was exposed to either cisplatin (10 microM) or 5-fluorouracil (5FUra) (5 microM) for 1 hr. Cytotoxicity was less than 14% with either agent alone. Cisplatin (10 microM) and 5FUra (5 microM) in combination for 1 hr caused a 76% reduction in cell growth. Thymidine (dThd, 10 microM), if given concomitantly with the combination of cisplatin and 5FUra, completely protected the tumor cells. A 30-min exposure to cisplatin increased the intracellular pools of 5,10-methylenetetrahydrofolate and tetrahydrofolate 2.5-fold. The capacity of intact cells to form 5-fluorodeoxyuridylate (FdUMP)-thymidylate (dTMP) synthase complex when incubated with fluorodeoxyuridine (FdUrd) was enhanced 2.5-fold when the cells were pretreated with cisplatin. These experiments demonstrate that cisplatin can increase the availability of the reduced folate necessary for tight binding of FdUMP to dTMP synthase, thus enhancing the cytotoxicity of the cisplatin and 5FUra combination.
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2511
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Lu Y, Yao TR, Chen ZN. [Studies on the constituents of Erycibe elliptilimba]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1986; 21:829-35. [PMID: 3591317] [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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2512
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Hayward JA, Durrani AA, Lu Y, Clayton CR, Chapman D. Biomembranes as models for polymer surfaces. IV. ESCA analyses of a phosphorylcholine surface covalently bound to hydroxylated substrates. Biomaterials 1986; 7:252-8. [PMID: 3741959 DOI: 10.1016/0142-9612(86)90045-1] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Using a simple chemical process, phosphorylcholine has been deposited covalently on the surface of a variety of hydroxylated polymers as a stable, monomolecular coating. Our goal was to obtain new biomaterials which, due to the chemical similarity of the modified interfaces to the phospholipid head groups present on the extracellular surfaces of blood cell membranes, should exhibit enhanced haemo- and biocompatibility. Our previous analyses by chemical and spectrophotometric methods indicated that sufficient quantities of phosphorylcholine were deposited on glass and silica surfaces to result in appreciable modification of their interfacial properties. In the present study, we have examined a series of modified hydroxylated substrates by ESCA and demonstrate specific chemical modifications on the molecular surfaces of polymeric substrates.
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2513
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Shionoya S, Lu Y, Scanlon KJ. Properties of amino acid transport systems in K562 cells sensitive and resistant to cis-diamminedichloroplatinum(II). Cancer Res 1986; 46:3445-8. [PMID: 3708576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
When K562 cells were made resistant to cisplatin their neutral amino acid transport systems changed. K562 cells cloned in cisplatin developed a 6.7-fold resistance to the drug. The generation times for K562 cells sensitive (S) and resistant (DDP) to cisplatin were similar. The initial uptake and rapid efflux of cisplatin were similar in both cell lines. However, they differed in their sodium dependent neutral amino acid transport properties. In K562S cells the sodium-dependent uptake for methylaminoisobutyric acid was significantly inhibited by threonine (Ki = 10.3 mM), but in K562DDP the uptake of neutral amino acids was significantly lower, and methylaminoisobutyric acid uptake was minimally inhibited by threonine. When K562DDP cells were grown in the absence of cisplatin for 8 weeks, their amino acid transport properties reverted to those of K562S cells. In K562 cells, changes in plasma membrane essential amino acid transport systems were concomitant to both the development of resistance and the redevelopment of sensitivity to cisplatin. Therefore, human malignant cell sensitivity and resistance to cisplatin may be related to membrane nutrient transport systems.
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2514
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Lu Y, Han J, Liu HY, Zhong GP, Yang S, Jia TZ. [Differentiation of human promyelocytic leukemic cells (HL-60) induced by aclacinomycin-B]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1986; 8:211-3. [PMID: 2946461] [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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2515
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2516
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Lu Y, Penzkofer A. Optical constants measurements of strongly absorbing media. APPLIED OPTICS 1986; 25:221. [PMID: 18231165 DOI: 10.1364/ao.25.000221] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
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2517
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Xia JL, Tao P, Lu Y. [Experimental research of papillary muscle infarction]. ZHONGHUA XIN XUE GUAN BING ZA ZHI 1985; 13:129-31, 157-8. [PMID: 4042847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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2518
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Cheng YS, Lu Y, Su XL, Sun RH, Yu WD, Han R. [Studies on the distribution of a hematoporphyrin derivative (Jiguang No 3) in tumor tissue and organs and its correlation with photodynamic effects]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1985; 7:191-4. [PMID: 2939972] [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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2519
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Lu Y. [Epidemiological analysis of malaria during the last 30 years in Shanghai]. ZHONGHUA LIU XING BING XUE ZA ZHI = ZHONGHUA LIUXINGBINGXUE ZAZHI 1983; 4:29-31. [PMID: 6883473] [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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2520
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Lu Y. [X-ray analysis of Cushing's syndrome]. ZHONGHUA FANG SHE XUE ZA ZHI CHINESE JOURNAL OF RADIOLOGY 1982; 16:105-7. [PMID: 6215216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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2521
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Lu Y. [The characteristics of Brazilian population and the population policy of the Brazilian government]. REN KOU YAN JIU = RENKOU YANJIU 1982:52-4. [PMID: 12312831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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2522
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Yu YZ, Liu ZY, Li TL, Jin SX, Lu YF, Deng XX, Cai YN, Liao WI, Yan YZ, Yun JT, Li G, Lu Y, Wang FJ, Liang Y, Li JX, Lu WM. [The manufacture and efficiency test of the supplimental oxygen equipment for individuals working at high altitude (author's transl)]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1979; 1:259-64. [PMID: 233305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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2523
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Chen D, Deng J, Lu Y. A clinical study of antinuclear factor. TAIWAN YI XUE HUI ZA ZHI. JOURNAL OF THE FORMOSAN MEDICAL ASSOCIATION 1974; 73:685-91. [PMID: 4549433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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