351
|
Pechan T, Ye L, Chang Y, Mitra A, Lin L, Davis FM, Williams WP, Luthe DS. A unique 33-kD cysteine proteinase accumulates in response to larval feeding in maize genotypes resistant to fall armyworm and other Lepidoptera. THE PLANT CELL 2000; 12:1031-40. [PMID: 10899972 PMCID: PMC149047 DOI: 10.1105/tpc.12.7.1031] [Citation(s) in RCA: 117] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2000] [Accepted: 05/04/2000] [Indexed: 05/18/2023]
Abstract
Plants respond to insect feeding with a number of defense mechanisms. Using maize genotypes derived from Antiquan germ plasm that are resistant to Lepidoptera, we have demonstrated that a unique 33-kD cysteine proteinase accumulates in the whorl in response to larval feeding. The abundance of the proteinase increased dramatically at the site of larval feeding after 1 hr of infestation and continued to accumulate for as long as 7 days. The 33-kD cysteine proteinase was most abundant in the yellow-green portion of the whorl-the normal site of larval feeding and the tissue that has the greatest inhibitory effect on larval growth in bioassays. The proteinase was expressed in response to wounding and was found in senescent leaves. It may be a marker of programmed cell death. The gene coding for the proteinase, mir1, has been transformed into Black Mexican Sweet callus. When larvae were reared on callus expressing the proteinase, their growth was inhibited approximately 60 to 80%. The expression of a cysteine proteinase, instead of a cysteine proteinase inhibitor, may be a novel insect defense mechanism in plants.
Collapse
|
352
|
Zhang Y, Ye L, Ding Q, Fang Z, Yao M, Shi D. [Measurement of T and DHT contents in normal and diseased human prostate tissues]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 2000; 38:545-7. [PMID: 11832106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To measure T and DHT contents in normal and diseased human prostate tissues. METHODS Serum and prostatic T and DHT levels were measured in patients with normal, benign prostatic hyperplasia and prostate cancer. RESULTS A decline was observed in serum T level, but no change in DHT concentration with aging. There were no significant differences in both blood T and DHT levels between the patients with BPH or PCA and normal controls. Serum T level remained constant. There were excessive accumulation of DHT in BPH, and cancerous prostate tissues were responsible for the pathogenesis of BPH and PCA. Finasteride treatment did not produce a reduction in prostatic DHT content. CONCLUSION More than one form of 5a-reductases is responsible for the high level of DHT in the gland.
Collapse
|
353
|
Abstract
We have studied the possibility of shifting a thermodynamically unfavourable enzymatic equilibrium towards product formation via the addition of a highly specific adsorbent. The commercially interesting enzymatic condensation of Z-L-aspartic acid with L-phenylalanine methyl ester to the sweetener aspartame was chosen as the model system. Extremely stable and specific adsorbents for the product Z-L-Asp-L-Phe-OMe (Z-aspartame) were prepared using the emerging technique of molecular imprinting. A considerable increase (40%) in the yield of product was obtained when such adsorbents were present during the enzymatic reaction. The message of this investigation is that the use of such specific, sterilizable adsorbents should be considered for enzymatic processes to increase the yield. Finally, the direct isolation of a product formed by the retrieval of the adsorbents carrying the product can be envisaged, especially if the adsorbents are magnetic.
Collapse
|
354
|
Abstract
Studying monogenic hereditary disorders that manifest age-related phenotypes in cells, tissues, and the total organism would be helpful for clarifying the mechanisms of aging. In this context, seven human disorders that manifest age-related phenotypes have been found to be caused by aberrations of five proteins with seven helicase motifs conserved in most of the helicases. These disorders are xeroderma pigmentosum, Cockayne syndrome, trichothiodystrophy, Bloom syndrome, Werner syndrome, X-linked alpha-thalassemia/mental retardation syndrome, and Juberg-Marsidi syndrome. A decline of probably pleiotropic and fundamental function of helicases in these disorders is, therefore, implied to underlie not only the various age-related phenotypes of the disorders but also the pleiotropic and universal nature of ordinary aging. Consistent with this implication, studies of these seven disorders suggest that their various age-related phenotypes are caused by aberrations in multiple processes, especially transcription. Furthermore, a few studies imply some association between aberration of the helicases and phenotypes in ordinary aging.
Collapse
|
355
|
Wu P, Ye L. [Determination of effective components in propolis]. WEI SHENG YAN JIU = JOURNAL OF HYGIENE RESEARCH 2000; 29:123-4. [PMID: 12725096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
Abstract
Propolis is a resinous hive product collected by bees. Propolis is a complex mixture of phenols, acids, alcohol and flavonoids. The aim of the present work is to study the effective components present in propolis and to confirm its biological activities. Four extracts from propolis were obtained by using different organic solutions. Further separation and identification were carried out by capillary gas chromatography and mass spectrometry(CGC/MS). The CGC/MS analysis on propolis extracted by different solvents resulted in more than 80 compounds being separated. Another 38 bioactive materials, including 6 alcohol, 5 phenols, 6 acids, 6 flavonoids and 13 others, have been identified.
Collapse
|
356
|
Nagasaki M, Ye L, Duan D, Horowitz B, Hume JR. Intracellular cyclic AMP inhibits native and recombinant volume-regulated chloride channels from mammalian heart. J Physiol 2000; 523 Pt 3:705-17. [PMID: 10718749 PMCID: PMC2269833 DOI: 10.1111/j.1469-7793.2000.00705.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
1. ClC-3 encodes a volume-regulated Cl- channel (ICl,vol) in heart. We studied the regulation of native and recombinant cardiac ICl,vol by intracellular cyclic AMP (cAMPi). 2. Symmetrical high Cl- concentrations were used to effectively separate outwardly rectifying ICl,vol from other non-rectifying Cl- currents, such as the cystic fibrosis transmembrane conductance regulator (CFTR) and Ca2+-activated Cl- currents (ICl,CFTR and ICl,Ca, respectively), which are concomitantly expressed in cardiac myocytes. 3. 8-Bromo-cyclic AMP (8-Br-cAMP) significantly inhibited ICl,vol in most guinea-pig atrial myocytes. In approximately 30 % of the atrial myocytes examined, 8-Br-cAMP increased macroscopic Cl- currents. However, the 8-Br-cAMP-stimulated difference currents exhibited a linear current-voltage (I-V ) relation, consistent with activation of ICl,CFTR, not ICl,vol. 4. In canine atrial myocytes, isoprenaline (1 microM) consistently reduced ICl,vol in Ca2+-free hypotonic bath solutions with strong intracellular Ca2+ (Ca2+i) buffering. In Ca2+-containing hypotonic bath solutions with weak Ca2+i buffering, however, isoprenaline increased net macroscopic Cl- currents. Isoprenaline-stimulated difference currents were not outwardly rectifying, consistent with activation of ICl,Ca, not ICl, vol. 5. In NIH/3T3 cells transfected with gpClC-3 (the gene encoding ICl,vol), 8-Br-cAMP consistently inhibited ICl,ClC-3. These effects were prevented by a protein kinase A (PKA) inhibitor, KT5720, or by mutation of a single consensus protein kinase C (PKC) phosphorylation site (S51A) on the N-terminus of ClC-3, which also mediates PKC inhibition of ICl,ClC-3. 6. We conclude that cAMPi causes inhibition of ICl,vol in mammalian heart due to cross-phosphorylation of the same PKC consensus site on ClC-3 by PKA. Our results suggest that contamination of macroscopic ICl,vol by ICl,CFTR and/or ICl,Ca may account for some of the inconsistent and controversial effects of cAMPi on ICl,vol previously reported in native cardiac myocytes.
Collapse
|
357
|
Duan D, Ye L, Britton F, Horowitz B, Hume JR. A novel anionic inward rectifier in native cardiac myocytes. Circ Res 2000; 86:E63-71. [PMID: 10700456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
Although the cationic inward rectifiers (Kir and hyperpolarization-activated I(f) channels) have been well characterized in cardiac myocytes, the expression and physiological role of anionic inward rectifiers in heart are unknown. In the present study, we report the functional and molecular identification of a novel chloride (Cl(-)) inward rectifier (Cl.ir) in mammalian heart. Under conditions in which cationic inward rectifier channels were blocked, membrane hyperpolarization (-40 to -140 mV) activated an inwardly rectifying whole-cell current in mouse atrial and ventricular myocytes. Under isotonic conditions, the current activated slowly with a biexponential time course (time constants averaging 179.7+/-23.4 [mean+/-SEM] and 2073.6+/-287.6 ms at -120 mV). Hypotonic cell swelling accelerated the activation and increased the current amplitude whereas hypertonic cell shrinkage inhibited the current. The inwardly rectifying current was carried by Cl(-) (I(Cl.ir)) and had an anion permeability sequence of Cl(-)>I(-)>>aspartate. I(Cl.ir) was blocked by 9-anthracene-carboxylic acid and cadmium but not by stilbene disulfonates and tamoxifen. A similar I(Cl.ir) was also observed in guinea pig cardiac myocytes. The properties of I(Cl.ir) are consistent with currents generated by expression of ClC-2 Cl(-) channels. Reverse transcription polymerase chain reaction and Northern blot analysis confirmed transcriptional expression of ClC-2 in both atrial and ventricular tissues and isolated myocytes of mouse and guinea pig hearts. These results indicate that a novel I(Cl.ir) is present in mammalian heart and support a potentially important role of ClC-2 channels in the regulation of cardiac electrical activity and cell volume under physiological and pathological conditions.
Collapse
|
358
|
Tong L, Shen Y, Chen F, Ye L. Plastic bending of sapphire fibers for infrared sensing and power-delivery applications. APPLIED OPTICS 2000; 39:494-501. [PMID: 18337918 DOI: 10.1364/ao.39.000494] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Sapphire fibers with diameters of 325-850 microm were plastically bent by CO(2) laser beams with typical bending radii as small as 2.8 mm. The additional optical loss caused by a single bend was less than 0.1 dB (at 900 nm), the damage threshold of the bent fibers was higher than 150 MW/cm(2) for Nd:YAG laser pulses, and the high mechanical strength of the bending area was also proved. Several successful applications of bent sapphire fibers have shown that plastically bent sapphire fibers are promising for use in IR sensing and power-delivery applications.
Collapse
|
359
|
Wei QD, Yu XB, Ye L, Xu J. [Amplification, cloning and expression of a gene encoding hexose transporter of Plasmodium falciparum]. ZHONGGUO JI SHENG CHONG XUE YU JI SHENG CHONG BING ZA ZHI = CHINESE JOURNAL OF PARASITOLOGY & PARASITIC DISEASES 2000; 18:343-6. [PMID: 12567609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/20/2023]
Abstract
OBJECTIVE To amplify, clone and express of a gene encoding hexose transporter of Plasmodium falcipuram (PfHT1) from Southern China isolate FCC1/HN for studing the immune of recombinant which protective from malaria parasite infection. METHODS Cultivation of P. falciparum isolate FCC1/HN in vitro; extraction of genomic DNA from FCC1/HN using the alkali specific cleavage method; PCR amplification of PfHT1 and cloning into eukaryotic expression vector, pEGFPN3. The recombinant as introduced into mammalian cells, HEPG2 by using liposome-mediated transfection. RESULTS The gene encoding PfHT1 was specifically amplified from the genomic DNA of P. falciparum isolate FCC1/HN. The size of amplified fragment was 1,516 base pair. The eukaryotic expression recombinant, pN3-HT1, was constructed and expressed steadily in the hepatocarcinoma cell lines, HEPG2. CONCLUSION The gene encoding PfHT1 was successfully amplified and cloned. The pN3-HT1/HEPG2 cell line was built for expressing fusion protein of GFP-HT1.
Collapse
|
360
|
Han Y, Xiao D, Xiang Y, Ye L, Cheng C. [Study on the volatile oil of Nardostachys chinensis]. ZHONG YAO CAI = ZHONGYAOCAI = JOURNAL OF CHINESE MEDICINAL MATERIALS 2000; 23:34-5. [PMID: 12575115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
The volatile oil of Nardostachys chinensis Batal has been studied by GC-MS, and 21 compounds have been isolated and identified. The total content of the components are 88.51%. Major compounds have been identified as Calarene (29.44%). delta 1(10)-Aristolenone-2 (16.57%) and Jatamansinol (8.80%).
Collapse
|
361
|
Zhang JN, Ye L, Xi HW, Li Q. Bis(2-azidoethyl) [(3-methylphenyl)( p-toluenesulfonamido)methyl]phosphonate. Acta Crystallogr C 1999. [DOI: 10.1107/s0108270199098224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
|
362
|
Wang X, Zhang Y, Ding Q, Ye L, Zhai L, Jia W. [Detection of telomerase activity in prostate needle-biopsy samples]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1999; 37:762-4. [PMID: 11829949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To detect telomerase activity inprostate needle-biopsy samples and its role in diagnosis and prognosis of prostate cancer. METHODS 20 tissue samples of prostate cancer tissues and 16 samples of adjacent tissues were obtained by needle-biopsy guided by transrectal B ultrasonography. 16 samples of benign prostatic hyperplasia tissues were obtained by prostatectomy and were confirmed pathologically. Telomerase activity was revealed by modified PCR-based telomeric repeat amplication protocol (TRAP)-silver staining assay. RESULTS Telomerase activity was revealed in 18 cases of prostate cancer. In tissues adjacent to prostate cancer, telomerase activity was found in 7 of 11 cases of prostatic intraepithelial neoplasia (PIN), and in 2 of 5 cases of BPH. None of tissue samples from patients with BPH showed telomerase activity. CONCLUSIONS Telomerase activity in prostate needle-biopsy samples might be an useful marker for detecting prostate cancer and biological malignancy.
Collapse
|
363
|
Liu X, Ye L, Wang J, Fan D. Expression of heat shock protein 90 beta in human gastric cancer tissue and SGC7901/VCR of MDR-type gastric cancer cell line. Chin Med J (Engl) 1999; 112:1133-7. [PMID: 11721455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023] Open
Abstract
OBJECTIVE To examine the expression of heat shock protein (HSP) 90 beta in human gastric cancer tissue and SGC7901/VCR of MDR-type gastric cancer cell line. METHODS Immunohistochemical staining and in situ hybridization methods. RESULTS Heat shock protein 90 beta was mainly located in the cell cytoplasma and weakly expressed in non-cancerous gastric mucosa. The expression rates of HSP90 beta in normal gastric mucosa, gastritis and paracancer tissues were 11.76%, 13.04% and 11.42% respectively, and there were no significant differences between them (P > 0.05). The expression of HSP90 beta was increased in gastric cancer. The positive rate of HSP90 beta in gastric cancer tissue was 30.00%, and was higher than non-cancerous gastric mucosa (P < 0.05). The expression rates of HSP90 beta in well differentiated, moderately differentiated, poorly differentiated gastric cancer and mucinous carcinoma were 15.38%, 31.25%, 33.33%, and 42.85% respectively. The expression of HSP90 beta in SGC7901/VCR of MDR-type gastric cell line was higher than in its parental cell line SGC7901. In situ hybridization showed that the positive signal of HSP90 beta was mainly located in the cell cytoplasma. CONCLUSIONS The expression of HSP90 beta was higher in gastric cancer tissue than in non-cancerous gastric mucosa. In gastric cancer tissue, the expression of HSP90 beta was greater in poorly differentiated cancer tissue, and in SGC7901/VCR of MDR-type gastric cancer cell line the expression of HSP90 beta was higher than that in its parental cell line SGC7901.
Collapse
|
364
|
Ye L, Chen Y, Lou X, Xiong G. Standard growth curve chart for body height of Chinese adolescent for orthodontic diagnosis. THE CHINESE JOURNAL OF DENTAL RESEARCH : THE OFFICIAL JOURNAL OF THE SCIENTIFIC SECTION OF THE CHINESE STOMATOLOGICAL ASSOCIATION (CSA) 1999; 2:54-8. [PMID: 10863418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
OBJECTIVE To make a standard growth curve chart on the body height of Chinese adolescents. METHODS Statistical data from 32,524 Sichuan students aged 7 to 19 years were surveyed in 1995. Mean values of the annual increment of body height and the ages of the pubertal growth periods were analyzed. RESULTS During the period between 9 and 13 years of age, females grow faster than their male peers. After age 13 years, males surpass females, and the difference in physical growth and development becomes more pronounced. CONCLUSIONS The new standard growth curve chart on the body height of Chinese adolescent may be applied to better understand the growth pattern of Chinese orthodontic patients.
Collapse
|
365
|
Ye L, Qiao JT. Suppressive action produced by beta-amyloid peptide fragment 31-35 on long-term potentiation in rat hippocampus is N-methyl-D-aspartate receptor-independent: it's offset by (-)huperzine A. Neurosci Lett 1999; 275:187-90. [PMID: 10580706 DOI: 10.1016/s0304-3940(99)00795-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Extracellular recordings of field potential from CA1 region of rat hippocampal slices were used to observe the effects of a shorter synthetic fragment of beta-amyloid peptide (A beta31-35) on the induction of long-term potentiation (LTP) and the action of (-)huperzine A, a potent acetylcholinesterase (AChE) inhibitor on these processes was also observed. The results showed that: (1) 0.1 microM A beta31-35 suppressed the induction of LTP in a similar mode as the longer fragment A beta25-35, did, while they did not change the amplitude of the baseline population spike (PS); (2) when PSs were recorded separately in Mg2+-free medium, which unveils the N-methyl-D-aspartate (NMDA)-mediated responses, both A beta31-35 and A beta25-35 showed little effect on the components of multiple PSs; (3) two concentrations of 0.1 microM or 1.0 microM (-)huperzine A showed no effects on the PS amplitude while the latter could enhance the LTP and (4) co-administration of (-)huperzine A with 0.1 microM concentration could block most of the suppressive action induced by A beta31-35 or A beta25-35 upon the LTP. The results suggest that the shorter fragment A beta31-35, is long enough to suppress the induction of LTP and these two fragments might suppress the induction of LTP through a NMDA receptor-independent pathway that involves cholinergic terminals in hippocampus.
Collapse
|
366
|
Duan D, Ye L, Britton F, Miller LJ, Yamazaki J, Horowitz B, Hume JR. Purinoceptor-coupled Cl- channels in mouse heart: a novel, alternative pathway for CFTR regulation. J Physiol 1999; 521 Pt 1:43-56. [PMID: 10562333 PMCID: PMC2269652 DOI: 10.1111/j.1469-7793.1999.00043.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
1. P2-purinoceptors couple extracellular ATP to the activation of a Cl- current (ICl,ATP) in heart. We studied the molecular mechanism and intracellular signalling pathways of ICl,ATP activation in mouse heart. 2. Extracellular adenosine-5'-O-(3-thiotriphosphate) (ATPgammaS; 100 microM) activated ICl,ATP in both atrial and ventricular myocytes. A specific PKC inhibitor, bisindolylmaleimide blocked the effect of ATPgammaS while a PKC activator, phorbol 12, 13-dibutyrate (PDBu) activated a current with identical properties to ICl,ATP. Maximal activation of ICl,ATP by ATPgammaS or PDBu occluded further modulation by the other agonist, suggesting that they may activate the same population of Cl- channels. 3. Isoprenaline increased ICl,ATP pre-activated by ATPgammaS or PDBu, while isoprenaline or forskolin alone failed to activate any Cl- current in these myocytes. Adenosine 3',5'-cyclic monophosphothionate, a PKA inhibitor, prevented ATPgammaS or PDBu activation of ICl,ATP. Thus, ICl,ATP is regulated by dual intracellular phosphorylation pathways involving both PKA and PKC in a synergistic manner similar to cystic fibrosis transmembrane conductance regulator (CFTR) Cl- channels. 4. Glibenclamide (50 microM) significantly blocked ICl,ATP activated by ATPgammaS or by the CFTR channel activator, levamisole. 5. The slope conductance of the unitary ICl,ATP in cell-attached patches was 11.8 +/- 0.3 pS, resembling the known properties of CFTR Cl- channels in cardiac myocytes. 6. The reverse transcription polymerase chain reaction and Northern blot analysis revealed CFTR mRNA expression in mouse heart. 7. We conclude that ICl,ATP in mouse heart is due to activation of CFTR Cl- channels through a novel intracellular signalling pathway involving purinergic activation of PKC and PKA.
Collapse
|
367
|
Ye L, Ramström O, Ansell RJ, Månsson MO, Mosbach K. Use of molecularly imprinted polymers in a biotransformation process. Biotechnol Bioeng 1999; 64:650-5. [PMID: 10417213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
Molecularly imprinted polymers are highly stable and can be sterilised, making them ideal for use in biotransformation process. In this communication, we describe a novel application of molecularly imprinted polymers in an enzymatic reaction. The enzymatic condensation of Z-L-aspartic acid with L-phenylalanine methyl ester to give Z-L-Asp-L-Phe-OMe (Z-aspartame) was chosen as a model system to evaluate the applicability of using molecularly imprinted polymers to facilitate product formation. When the product-imprinted polymer is present, a considerable increase (40%) in product yield is obtained. Besides their use to enhance product yields, as demonstrated here, we suggest that imprinted polymers may also find use in the continuous removal of toxic compounds during biochemical reactions.
Collapse
|
368
|
Liao W, Liu Y, Ye L. [Detection of stable expression of human interlukin-2 gene in transfected keratinocytes]. ZHONGHUA YI XUE ZA ZHI 1999; 79:705-7. [PMID: 11715464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
OBJECTIVE To investigate the stable expression and secretion of human interlukin-2 gene in transfected keratinocytes. METHODS Keratinocytes were transfected with lipofectamine and selected by G418. Then the samples were analyzed with the techniques of DNA dot blot, RNA dot blot, hybridization in situ, immunohistochemistry, Western blot and MTT. RESULTS The positive signals were observed in transfected keratinocytes by DNA dot blot, RNA dot blot, hybridization in situ and immunohistochemistry. With Western blot analysis, a specific band exhibiting a molecular weight of 15,000 was detected in transfected keratinocytes, which was in acordance with that of IL-2. The expression of IL-2 can maintain for up to 1 month. The amounts of IL-2 in the supernatants of two and four passages transfected keratinocytes were 27.7 U/ml and 15.0 U/ml, respectively. CONCLUSION Keratinocytes have the potential for stable gene expression and secretion of active transgene products. Thus, it is possible to use keratinocytes as a target cell for gene transfection, gene expression and even gene therapy.
Collapse
|
369
|
Ye L, Chen Y, Xiong G. [Studies on standard growth curve chart on body weight of adolescent Chinese for orthodontic diagnosis]. HUA XI KOU QIANG YI XUE ZA ZHI = HUAXI KOUQIANG YIXUE ZAZHI = WEST CHINA JOURNAL OF STOMATOLOGY 1999; 17:278-80. [PMID: 12539307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
OBJECTIVE To establish the first new annual increase and growth curve charts on the body weight of Chinese children. METHODS Data were surveyed in 1995, which were obtained from subjects consisting of 32524 students aged from 7 to 19 years in Sichuan province. RESULTS Mean values of the annual increment of body weight, sex and area difference were analyzed. CONCLUSION The new standard growth curve chart on the body weight is very useful for orthodontic diagnosis, treatment and prognosis.
Collapse
|
370
|
Ye L, Kruckeberg AL, Berden JA, van Dam K. Growth and glucose repression are controlled by glucose transport in Saccharomyces cerevisiae cells containing only one glucose transporter. J Bacteriol 1999; 181:4673-5. [PMID: 10419970 PMCID: PMC103603 DOI: 10.1128/jb.181.15.4673-4675.1999] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A set of Saccharomyces cerevisiae strains with variable expression of only the high-affinity Hxt7 glucose transporter was constructed by partial deletion of the HXT7 promoter in vitro and integration of the gene at various copy numbers into the genome of an hxt1-7 gal2 deletion strain. The glucose transport capacity increased in strains with higher levels of HXT7 expression. The consequences for various physiological properties of varying the glucose transport capacity were examined. The control coefficient of glucose transport with respect to growth rate was 0.54. At high extracellular glucose concentrations, both invertase activity and the rate of oxidative glucose metabolism increased manyfold with decreasing glucose transport capacity, which is indicative of release from glucose repression. These results suggest that the intracellular glucose concentration produces the signal for glucose repression.
Collapse
|
371
|
Zhong N, Ju W, Brown WT, Ye L, Jenkins EC, Schupf N. Distribution of apolipoprotein E genotypes in fragile X syndrome and Batten disease. AMERICAN JOURNAL OF MEDICAL GENETICS 1999; 84:309-10. [PMID: 10331615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/13/2023]
|
372
|
Zhong N, Ju W, Xu W, Ye L, Shen Y, Wu G, Chen SH, Jin R, Hu XF, Yang A, Liu X, Poon P, Pang C, Zheng Y, Song L, Zhao P, Fu B, Gu H, Brown WT. Frequency of the fragile X syndrome in Chinese mentally retarded populations is similar to that in Caucasians. AMERICAN JOURNAL OF MEDICAL GENETICS 1999; 84:191-4. [PMID: 10331588 DOI: 10.1002/(sici)1096-8628(19990528)84:3<191::aid-ajmg3>3.0.co;2-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Fragile X syndrome is recognized as the most common inherited cause of mental retardation in western countries. The prevalence of the fragile X syndrome in Asian populations is uncertain. We report a multi-institutional collaborative study of molecular screening for the fragile X syndrome from 1,127 Chinese mentally retarded (MR) individuals. We found that 2.8% of the Chinese MR population screened by DNA analysis had the fragile X full mutation. Our screening indicated that the fragile X syndrome prevalence was very close to that of Caucasian subjects. In addition, we found that 62.5% of fragile X chromosomes had a single haplotype for DXS548-FRAXAC1 (21-18 repeats) which was present in only 9.7% of controls. This unique distribution of microsatellite markers flanking the FMR1 CGG repeats suggests that the fragile X syndrome in Chinese populations, as in the Caucasian, may also be derived from founder chromosomes.
Collapse
|
373
|
Bu W, Ye L, Xu Q, Bu X, Yang G, Fan Y. Bis(μ-azido-κ N1:κ N1)bis{[2-(1,5-diazacyclooct-1-yl-κ 2N, N'-methyl)phenolato-κ O]copper(II)}. Acta Crystallogr C 1999. [DOI: 10.1107/s0108270199099515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
|
374
|
Bu W, Ye L, Zhu H, Yang G, Fan Y, Tang W. μ-1,3-Imidazolyl-κ N:κ N'-bis[(diethylenetriaminato-κ 3N)copper] triperchlorate hydrate. Acta Crystallogr C 1999. [DOI: 10.1107/s0108270199099527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
375
|
Bu W, Wang J, Ye L, Mu Y, Yang G, Fan Y. Dichloro{2-[(η5-cyclopentadienyl)phenylmethyl]phenolato-O}titanium. Acta Crystallogr C 1999. [DOI: 10.1107/s0108270198015479] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|