401
|
Bartelt, Csorna, Egyed, Jain, Gibaut, Kinoshita, Pomianowski, Barish, Chadha, Chan, Cowen, Eigen, Miller, O'Grady, Urheim, Weinstein, Würthwein, Asner, Athanas, Bliss, Brower, Masek, Paar, Gronberg, Korte, Kutschke, Menary, Morrison, Nakanishi, Nelson, Nelson, Qiao, Richman, Roberts, Ryd, Tajima, Witherell, Balest, Cho, Ford, Lohner, Park, Rankin, Smith, Alexander, Bebek, Berger, Berkelman, Bloom, Browder, Cassel, Cho, Coffman, Crowcroft, Dickson, Drell, Dumas, Ehrlich, Elia, Gaidarev, Garcia-Sciveres, Gittelman, Gray, Hartill, Heltsley BK, Henderson S, Jones CD, Jones SL, Kandaswamy J, Katayama N, Kim PC, Kreinick DL, Lee T, Liu Y, Ludwig GS, Masui J, Mevissen J, Mistry NB, Ng CR, Nordberg E, Patterson JR, Peterson D, Riley D, Soffer A, Avery P, Freyberger A, Lingel K, Rodriguez J, Yang S, Yelton J, Brandenburg G, Cinabro D, Liu T, Saulnier M, Wilson R, Yamamoto H, Bergfeld T, Eisenstein BI, Ernst J, Gladding GE, Gollin GD, Palmer M, Selen M, Thaler JJ, Edwards KW, McLean KW, Ogg M, Bellerive A, Britton DI, Hyatt ERF, Janicek R, MacFarlane DB, Patel PM, Spaan B, Sadoff AJ, Ammar R, Baringer P, Bean A, Besson D, Coppage D, Copty N, Davis R, Hancock N, Kelly M, Kotov S, Kravchenko I, Kwak N, Lam H, Kubota Y, Lattery M, Momayezi M, Nelson JK, Patton S, Poling R, Savinov V, Schrenk S, Wang R, Alam MS, Kim IJ, Ling Z, Mahmood AH, O’Neill JJ, Severini H, Sun CR, Wappler F, Crawford G, Fulton R, Fujino D, Gan KK, Honscheid K, Kagan H, Kass R, Lee J, Sung M, White C, Wolf A, Zoeller MM, Fu X, Nemati B, Ross WR, Skubic P, Wood M, Bishai M, Fast J, Gerndt E, Hinson JW, McIlwain RL, Miao T, Miller DH, Modesitt M, Payne D, Shibata EI, Shipsey IPJ, Wang PN, Gibbons L, Kwon Y, Roberts S, Thorndike EH, Coan T, Dominick J, Fadeyev V, Korolkov I, Lambrecht M, Sanghera S, Shelkov V, Skwarnicki T, Stroynowski R, Volobouev I, Wei G, Artuso M, Gao M, Goldberg M, He D, Horwitz N, Moneti GC, Mountain R, Muheim F, Mukhin Y, Playfer S, Rozen Y, Stone S, Xing X, Zhu G. Search for CP violation in D0 decay. Int J Clin Exp Med 1995; 52:4860-4867. [PMID: 10019710 DOI: 10.1103/physrevd.52.4860] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
402
|
Abstract
Skeletal muscle structure and morphology may be altered in obesity. To study this further, muscles from six genetically obese (fa/fa) and six normal male rats were examined at 15 weeks of age. The gluteus medius, vastus lateralis and rectus abdominis muscles were dissected out and stained for histochemical fibre typing. In addition the fibre cross-sectional area was measured on a graphic tablet. The proportion of fast-twitch fibres was larger in the vastus lateralis and rectus abdominis muscles of the obese rats (P < 0.01); no difference was seen for the gluteus medius muscle. For the normal rats the cross-sectional area of the fast-twitch fibres was 2-3 times larger than the area of slow-twitch fibres in the same muscle. The cross-sectional area of the fast-twitch fibres in the obese rats was 40-47% less than in the control animals (P < 0.003), while no difference between the two groups was found for the slow-twitch fibre area. The data thus suggest that in the genetically obese rats the development of fast-twitch fibres was primarily affected. Moreover, in these animals some muscles may be more affected than others.
Collapse
Affiliation(s)
- D He
- Department of Biomedical Engineering, University of Trondheim, Norway
| | | | | | | |
Collapse
|
403
|
Butler F, Fu X, Nemati B, Ross WR, Skubic P, Wood M, Bishai M, Fast J, Gerndt E, Hinson JW, McIlwain RL, Miao T, Miller DH, Modesitt M, Payne D, Shibata EI, Shipsey IP, Wang PN, Gibbons L, Kwon Y, Roberts S, Thorndike EH, Coan TE, Dominick J, Fadeyev V, Korolkov I, Lambrecht M, Sanghera S, Shelkov V, Skwarnicki T, Stroynowski R, Volobouev I, Wei G, Artuso M, Gao M, Goldberg M, He D, Horwitz N, Moneti GC, Mountain R, Muheim F, Mukhin Y, Playfer S, Rozen Y, Stone S, Xing X, Zhu G, Bartelt J, Csorna SE, Egyed Z, Jain V, Gibaut D, Kinoshita K, Pomianowski P, Barish B, Chadha M, Chan S, Cowen DF, Eigen G, Miller JS, O'Grady C, Urheim J, Weinstein AJ, Würthwein F. Measurement of the ratio of branching fractions B(D0--> pi -e+ nu e)/B(D0-->K-e+ nu e). Phys Rev D Part Fields 1995; 52:2656-2660. [PMID: 10019482 DOI: 10.1103/physrevd.52.2656] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
404
|
Zhu X, Chang KH, He D, Mancini MA, Brinkley WR, Lee WH. The C terminus of mitosin is essential for its nuclear localization, centromere/kinetochore targeting, and dimerization. J Biol Chem 1995; 270:19545-50. [PMID: 7642639 DOI: 10.1074/jbc.270.33.19545] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Mitosin is a novel 350-kDa nuclear phosphoprotein that dramatically relocates from the evenly nuclear distribution in S phase to the centromere/kinetochore and mitotic apparatus in M phase. The dynamic relocalization of mitosin is accompanied by the phosphorylation of itself, suggesting that mitosin plays a role in mitotic progression. The molecular basis of nuclear localization and targeting of mitosin to the centromere/kinetochore were characterized using a set of epitope-tagged deletion mutants. The data indicate that the extreme C terminus (amino acids 2,487-3,113) of mitosin has both an independent centromere/kinetochore targeting domain and an unusually spaced bipartite nuclear localization signal. Moreover, the same centromere/kinetochore targeting domain was shown to be essential for the ability of mitosin to bind to itself or other putative mitosin-associated proteins through use of the yeast two-hybrid system. These results suggest that the C terminus of the mitosin is essential for its role in influencing cell cycle progression.
Collapse
Affiliation(s)
- X Zhu
- Center for Molecular Medicine/Institute of Biotechnology, University of Texas Health Science Center at San Antonio 78245, USA
| | | | | | | | | | | |
Collapse
|
405
|
Artuso M, Gao M, Goldberg M, He D, Horwitz N, Moneti GC, Mountain R, Muheim F, Mukhin Y, Playfer S, Rozen Y, Stone S, Xing X, Zhu G, Bartelt J, Csorna SE, Egyed Z, Jain V, Gibaut D, Kinoshita K, Pomianowski P, Barish B, Chadha M, Chan S, Cowen DF, Eigen G, Miller JS, O'Grady C, Urheim J, Weinstein AJ, Würthwein F, Asner DM, Athanas M, Bliss DW, Brower WS, Masek G, Paar HP, Gronberg J, Korte CM, Kutschke R, Menary S, Morrison RJ, Nakanishi S, Nelson HN, Nelson TK, Qiao C, Richman JD, Roberts D, Ryd A, Tajima H, Witherell MS, Balest R, Cho K, Ford WT, Lohner M, Park H, Rankin P, Smith JG, Alexander JP, Bebek C, Berger BE, Berkelman K, Bloom K, Browder TE. Search for B-->. Phys Rev Lett 1995; 75:785-789. [PMID: 10060118 DOI: 10.1103/physrevlett.75.785] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
406
|
Crawford G, Daubenmier CM, Fulton R, Fujino D, Gan KK, Honscheid K, Kagan H, Kass R, Lee J, Sung M, White C, Wolf A, Zoeller MM, Butler F, Fu X, Nemati B, Ross WR, Skubic P, Wood M, Bishai M, Fast J, Gerndt E, Hinson JW, McIlwain RL, Miao T, Miller DH, Modesitt M, Payne D, Shibata EI, Shipsey IP, Wang PN, Battle M, Ernst J, Gibbons L, Kwon Y, Roberts S, Thorndike EH, Wang CH, Dominick J, Lambrecht M, Sanghera S, Shelkov V, Skwarnicki T, Stroynowski R, Volobouev I, Wei G, Zadorozhny P, Artuso M, Gao M, Goldberg M, He D, Horwitz N, Moneti GC, Mountain R, Muheim F, Mukhin Y, Playfer S, Rozen Y, Stone S, Xing X, Zhu G, Bartelt J, Csorna SE, Egyed Z. Form factor ratio measurement in Lambda +c--> Lambda e+ nu e. Phys Rev Lett 1995; 75:624-628. [PMID: 10060073 DOI: 10.1103/physrevlett.75.624] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
407
|
Abstract
To study porphyrin biosynthesis in human microvascular endothelial cells, HMEC-1 cells, a transformed human microvascular endothelial cell line, were incubated with 5-aminolevulinic acid (ALA), the precursor of endogenous porphyrins, and porphyrin accumulation was measured spectro-fluorometrically. The HMEC-1 cells accumulated porphyrin in a concentration-related and a time-dependent fashion. Protoporphyrin was the predominant porphyrin accumulated in the cells. The effect of light on protoporphyrin accumulation was evaluated by exposing the ALA-loaded HMEC-1 cells to ultraviolet-A (UVA) and blue light, followed by another incubation with ALA for 2-24 h. Enhancement of protoporphyrin accumulation in irradiated HMEC-1 cells was observed 2-24 h after irradiation, which was associated with a decrease in ferrochelatase protein and activity. Porphyrin accumulation from ALA after irradiation was significantly decreased when catalase (750-3000 U/mL, 29.3-44.3% suppression) or superoxide dismutase (270 U/mL, 36.4% suppression) was present during irradiation. These data demonstrate that HMEC-1 cells were capable of porphyrin biosynthesis, and that exposure of protoporphyrin-containing HMEC-1 cells to UVA and blue light, which includes the Soret band spectrum, decreased the ferrochelatase activity and its protein. These changes were mediated, at least in part, by reactive oxygen species.
Collapse
Affiliation(s)
- D He
- Dermatology Service, Department of Veterans Affairs Medical Center, New York, NY 10010, USA
| | | | | | | | | |
Collapse
|
408
|
Alam MS, Kim IJ, Ling Z, Mahmood AH, O'Neill JJ, Severini H, Sun CR, Wappler F, Crawford G, Daubenmier CM, Fulton R, Fujino D, Gan KK, Honscheid K, Kagan H, Kass R, Lee J, Sung M, White C, Wolf A, Zoeller MM, Butler F, Fu X, Nemati B, Ross WR, Skubic P, Wood M, Bishai M, Fast J, Gerndt E, Hinson JW, McIlwain RL, Miao T, Miller DH, Modesitt M, Payne D, Shibata EI, Shipsey IP, Wang PN, Battle M, Ernst J, Gibbons L, Kwon Y, Roberts S, Thorndike EH, Wang CH, Coan T, Dominick J, Fadeyev V, Korolkov I, Lambrecht M, Sanghera S, Shelkov V, Skwarnicki T, Stroynowski R, Volobouev I, Wei G, Artuso M, Gao M, Goldberg M, He D, Horwitz N, Moneti GC, Mountain R. First measurement of the rate for the inclusive radiative penguin decay b-->s gamma. Phys Rev Lett 1995; 74:2885-2889. [PMID: 10058050 DOI: 10.1103/physrevlett.74.2885] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
409
|
He D, Behar S, Nomura N, Sassa S, Taketani S, Lim HW. The effect of porphyrin and radiation on ferrochelatase and 5-aminolevulinic acid synthase in epidermal cells. Photodermatol Photoimmunol Photomed 1995; 11:25-30. [PMID: 7654564 DOI: 10.1111/j.1600-0781.1995.tb00134.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The effects of ultraviolet A (UVA) and blue light on ferrochelatase protein, and its mRNA level, in 5-aminolevulinic acid (ALA)-loaded A431 cells was evaluated. Western blot analysis of ferrochelatase protein showed a protein band of 43 kDa. There was a decrease in the protein concentration 24 h and 48 h after irradiation of these cells. In contrast, as judged by Northern blot analysis, there was no change in ferrochelatase mRNA level. Measurement of ALA synthase activity showed an ALA dose-dependent but radiation-independent decrease of enzyme activity, suggesting an end-product feedback inhibition. Since reactive oxygen species generated by porphyrin-induced photochemical reaction may be involved in the decrease in ferrochelatase protein, the effect of scavengers of reactive oxygen species was evaluated by measuring porphyrin accumulation in irradiated, ALA-loaded A431 cells. Porphyrin accumulation was significantly decreased in the presence of singlet oxygen scavenger sodium azide (0.05 mM, 40.6% suppression) or hydroxyl radical scavenger mannitol (5.0 mM, 45.0% suppression). These data suggest that the photochemical reaction induced by porphyrin and irradiation resulted in a decrease in ferrochelatase protein content, but had no effect on ferrochelatase mRNA level nor on ALA synthase activity. The decrease in protein was partly mediated by the reactive oxygen species.
Collapse
Affiliation(s)
- D He
- Dermatology Service, Department of Veterans Affairs Medical Center, NY 10010, USA
| | | | | | | | | | | |
Collapse
|
410
|
Artuso M, He D, Goldberg M, Horwitz N, Kennett R, Moneti GC, Muheim F, Mukhin Y, Playfer S, Rozen Y, Stone S, Thulasidas M, Vasseur G, Zhu G, Bartelt J, Csorna SE, Egyed Z, Jain V, Sheldon P, Akerib DS, Barish B, Chadha M, Chan S, Cowen DF, Eigen G, Miller JS, O’Grady C, Urheim J, Weinstein AJ, Acosta D, Athanas M, Masek G, Paar H, Sivertz M, Bean A, Gronberg J, Kutschke R, Menary S, Morrison RJ, Nakanishi S, Nelson HN, Nelson TK, Richman JD, Ryd A, Tajima H, Schmidt D, Sperka D, Witherell MS, Procario M, Yang S, Balest R, Cho K, Daoudi M, Ford WT, Johnson DR, Lingel K, Lohner M, Rankin P, Smith JG, Alexander JP, Bebek C, Berkelman K, Besson D, Browder TE, Cassel DG, Cho HA, Coffman DM, Drell PS, Ehrlich R, Galik RS, Garcia-Sciveres M, Geiser B, Gittelman B, Gray SW, Hartill DL, Heltsley BK, Jones CD, Jones SL, Kandaswamy J, Katayama N, Kim PC, Kreinick DL, Ludwig GS, Masui J, Mevissen J, Mistry NB, Ng CR, Nordberg E, Ogg M, Patterson JR, Peterson D, Riley D, Salman S, Sapper M, Worden H, Würthwein F, Avery P, Freyberger A, Rodriguez J, Stephens R, Yelton J, Cinabro D, Henderson S, Kinoshita K, Liu T, Saulnier M, Shen F, Wilson R, Yamamoto H, Ong B, Selen M, Sadoff AJ, Ammar R, Ball S, Baringer P, Coppage D, Copty N, Davis R, Hancock N, Kelly M, Kwak N, Lam H, Kubota Y, Lattery M, Nelson JK, Patton S, Perticone D, Poling R, Savinov V, Schrenk S, Wang R, Alam MS, Kim IJ, Nemati B, O’Neill JJ, Severini H, Sun CR, Zoeller MM, Crawford G, Daubenmier CM, Fulton R, Fujino D, Gan KK, Honscheid K, Kagan H, Kass R, Lee J, Malchow R, Morrow F, Skovpen Y, Sung M, White C, Whitmore J, Wilson P, Butler F, Fu X, Kalbfleisch G, Lambrecht M, Ross WR, Skubic P, Snow J, Wang PL, Wood M, Bortoletto D, Brown DN, Fast J, McIlwain RL, Miao T, Miller DH, Modesitt M, Schaffner SF, Shibata EI, Shipsey IPJ, Wang PN, Battle M, Ernst J, Kroha H, Roberts S, Sparks K, Thorndike EH, Wang CH, Dominick J, Sanghera S, Shelkov V, Skwarnicki T, Stroynowski R, Volobouev I, Zadorozhny P. Measurement of the cross section for gamma gamma -->pp-bar. Phys Rev D Part Fields 1994; 50:5484-5490. [PMID: 10018206 DOI: 10.1103/physrevd.50.5484] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
411
|
Dominick J, Sanghera S, Shelkov V, Skwarnicki T, Stroynowski R, Volobouev I, Zadorozhny P, Artuso M, He D, Goldberg M, Horwitz N, Kennett R, Moneti GC, Muheim F, Mukhin Y, Playfer S, Rozen Y, Stone S, Thulasidas M, Vasseur G, Zhu G, Bartelt J, Csorna SE, Egyed Z, Jain V, Sheldon P, Akerib DS, Barish B, Chadha M, Chan S, Cowen DF, Eigen G, Miller JS, O'Grady C, Urheim J, Weinstein AJ, Acosta D, Athanas M, Masek G, Paar H, Sivertz M, Bean A, Gronberg J, Kutschke R, Menary S, Morrison RJ, Nakanishi S, Nelson HN, Nelson TK, Richman JD, Ryd A, Tajima H, Schmidt D, Sperka D, Witherell MS, Procario M, Yang S, Balest R, Cho K, Daoudi M, Ford WT, Johnson DR, Lingel K, Lohner M. Measurement of two-photon production of the chi c2. Phys Rev D Part Fields 1994; 50:4265-4271. [PMID: 10018068 DOI: 10.1103/physrevd.50.4265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
412
|
Mahley RW, Ji ZS, Brecht WJ, Miranda RD, He D. Role of heparan sulfate proteoglycans and the LDL receptor-related protein in remnant lipoprotein metabolism. Ann N Y Acad Sci 1994; 737:39-52. [PMID: 7944147 DOI: 10.1111/j.1749-6632.1994.tb44300.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- R W Mahley
- Gladstone Institute of Cardiovascular Disease, Department of Pathology, University of California at San Francisco 94141-9100
| | | | | | | | | |
Collapse
|
413
|
Dominick J, Lambrecht M, Sanghera S, Shelkov V, Skwarnicki T, Stroynowski R, Volobouev I, Wei G, Zadorozhny P, Artuso M, Goldberg M, He D, Horwitz N, Kennett R, Mountain R, Moneti GC, Muheim F, Mukhin Y, Playfer S, Rozen Y, Stone S, Thulasidas M, Vasseur G, Zhu G, Bartelt J, Csorna SE, Egyed Z, Jain V, Kinoshita K, Edwards KW, Ogg M, Britton DI, Hyatt ER, MacFarlane DB, Patel PM, Akerib DS, Barish B, Chadha M, Chan S, Cowen DF, Eigen G, Miller JS, O'Grady C, Urheim J, Weinstein AJ, Acosta D, Athanas M, Masek G, Paar HP, Sivertz M, Gronberg J, Kutschke R, Menary S, Morrison RJ, Nakanishi S, Nelson HN, Nelson TK, Qiao C, Richman JD, Ryd A, Tajima H, Sperka D, Witherell MS, Procario M. Two-photon production of charged pion and kaon pairs. Phys Rev D Part Fields 1994; 50:3027-3037. [PMID: 10017938 DOI: 10.1103/physrevd.50.3027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
414
|
Battle M, Ernst J, Kwon Y, Roberts S, Thorndike EH, Wang CH, Dominick J, Lambrecht M, Sanghera S, Shelkov V, Skwarnicki T, Stroynowski R, Volobouev I, Wei G, Zadorozhny P, Artuso M, Goldberg M, He D, Horwitz N, Kennett R, Mountain R, Moneti GC, Muheim F, Mukhin Y, Playfer S, Rozen Y, Stone S, Thulasidas M, Vasseur G, Zhu G, Bartelt J, Csorna SE, Egyed Z, Jain V, Kinoshita K, Edwards KW, Ogg M, Britton DI, Hyatt ER, MacFarlane DB, Patel PM, Akerib DS, Barish B, Chadha M, Chan S, Cowen DF, Eigen G, Miller JS, O'Grady C, Urheim J, Weinstein AJ, Acosta D, Athanas M, Masek G, Paar HP, Sivertz M, Gronberg J, Kutschke R, Menary S, Morrison RJ, Nakanishi S, Nelson HN, Nelson TK, Qiao C. Measurement of Cabibbo-suppressed decays of the tau lepton. Phys Rev Lett 1994; 73:1079-1083. [PMID: 10057619 DOI: 10.1103/physrevlett.73.1079] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
415
|
Brown DN, Fast J, McIlwain RL, Miao T, Miller DH, Modesitt M, Payne D, Shibata EI, Shipsey IP, Wang PN, Battle M, Ernst J, Kwon Y, Roberts S, Thorndike EH, Wang CH, Dominick J, Lambrecht M, Sanghera S, Shelkov V, Skwarnicki T, Stroynowski R, Volobouev I, Wei G, Zadorozhny P, Artuso M, Goldberg M, He D, Horwitz N, Kennett R, Mountain R, Moneti GC, Muheim F, Mukhin Y, Playfer S, Rozen Y, Stone S, Thulasidas M, Vasseur G, Zhu G, Bartelt J, Csorna SE, Egyed Z, Jain V, Kinoshita K, Edwards KW, Ogg M, Britton DI, Hyatt ER, MacFarlane DB, Patel PM, Akerib DS, Barish B, Chadha M, Chan S, Cowen DF, Eigen G, Miller JS, O'Grady C, Urheim J, Weinstein AJ, Acosta D, Athanas M, Masek G. Precision measurement of the Ds*+-Ds+ mass difference. Phys Rev D Part Fields 1994; 50:1884-1891. [PMID: 10017824 DOI: 10.1103/physrevd.50.1884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
416
|
Alam MS, Kim IJ, Nemati B, O'Neill JJ, Severini H, Sun CR, Zoeller MM, Crawford G, Daubenmier CM, Fulton R, Fujino D, Gan KK, Honscheid K, Kagan H, Kass R, Lee J, Malchow R, Morrow F, Skovpen Y, Sung M, White C, Butler F, Fu X, Kalbfleisch G, Ross WR, Skubic P, Snow J, Wang PL, Wood M, Brown DN, Fast J, McIlwain RL, Miao T, Miller DH, Modesitt M, Payne D, Shibata EI, Shipsey IP, Wang PN, Battle M, Ernst J, Kwon Y, Roberts S, Thorndike EH, Wang CH, Dominick J, Lambrecht M, Sanghera S, Shelkov V, Skwarnicki T, Stroynowski R, Volobouev I, Wei G, Zadorozhny P, Artuso M, Goldberg M, He D, Horwitz N, Kennett R, Mountain R, Moneti GC, Muheim F, Mukhin Y, Playfer S. Exclusive hadronic B decays to charm and charmonium final states. Phys Rev D Part Fields 1994; 50:43-68. [PMID: 10017512 DOI: 10.1103/physrevd.50.43] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
417
|
Artuso M, Goldberg M, He D, Horwitz N, Kennett R, Mountain R, Moneti GC, Muheim F, Mukhin Y, Playfer S, Rozen Y, Stone S, Thulasidas M, Vasseur G, Xing X, Zhu G, Bartelt J, Csorna SE, Egyed Z, Jain V, Kinoshita K, Barish B, Chadha M, Chan S, Cowen DF, Eigen G, Miller JS, O'Grady C, Urheim J, Weinstein AJ, Acosta D, Athanas M, Masek G, Paar HP, Sivertz M, Gronberg J, Kutschke R, Menary S, Morrison RJ, Nakanishi S, Nelson HN, Nelson TK, Qiao C, Richman JD, Ryd A, Tajima H, Sperka D, Witherell MS, Procario M, Balest R, Cho K, Daoudi M, Ford WT, Johnson DR, Lingel K, Lohner M, Rankin P, Smith JG, Alexander JP, Bebek C, Berkelman K, Bloom K, Browder TE, Cassel DG. Measurement of the branching fraction scrB( tau --->h---> pi 0 nu tau ). Phys Rev Lett 1994; 72:3762-3766. [PMID: 10056291 DOI: 10.1103/physrevlett.72.3762] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
418
|
Thurston GD, Gorczynski JE, Currie JH, He D, Ito K, Hipfner J, Waldman J, Lioy PJ, Lippmann M. The nature and origins of acid summer haze air pollution in metropolitan Toronto, Ontario. Environ Res 1994; 65:254-270. [PMID: 8187741 DOI: 10.1006/enrs.1994.1036] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
During July and August of 1986, 1987, and 1988, a field study was conducted of ambient acidic aerosol levels in Toronto, Ontario. Fine particle mass (da < 2.5 microns) samples were collected twice daily at a central-city site for the determination of particulate-phase strong acidity (H+) and sulfate (SO4 =). Two additional H(+)-monitoring sites were concurrently operated during the summers of 1986 and 1987 to examine the spatial variability of H+ within the metropolitan area. During the summer of 1986, a quasi-continuous total sulfate/sulfuric acid analyzer was also deployed to allow a determination of the chemical form of H+. Results indicate that acid aerosol episodes (H+ > or = 100 nmole/m3) did occur in this city during the summer months, and that H+ peaks were well correlated with sulfate peaks. Virtually all of the H+ was found to be present as ammonium bisulfate (NH4HSO4). While H+ concentrations were highly correlated among the three monitoring sites (r = 0.9), the highest H+/SO4 = ratios prevailed during SO4 = episode periods and at the least urbanized site. This latter trend was apparently due to greater neutralization of H+ by local ammonia at the more urbanized sites. Comparisons of day vs night H+/SO4 = ratios, an examination of air mass back-trajectories, and contemporaneous H+ measurements at surrounding sites collectively indicated that transported regional haze air pollution from the United States is a major contributor to the H+ events recorded within Toronto.
Collapse
Affiliation(s)
- G D Thurston
- Nelson Institute of Environmental Medicine, New York University Medical Center, Tuxedo 10987
| | | | | | | | | | | | | | | | | |
Collapse
|
419
|
Zeng C, He D, Berget SM, Brinkley BR. Nuclear-mitotic apparatus protein: a structural protein interface between the nucleoskeleton and RNA splicing. Proc Natl Acad Sci U S A 1994; 91:1505-9. [PMID: 8108437 PMCID: PMC43188 DOI: 10.1073/pnas.91.4.1505] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Vertebrate splicing factors are localized to discrete domains within the nuclei of somatic cells. The mechanism whereby such nuclear domains, identified as speckles by immunofluorescence microscopy, are generated is unclear. Recent studies suggest that the spatial order within the nucleus is maintained by nuclear matrix factors. Here we show that a protein in the nuclear matrix and mitotic apparatus [nuclear-mitotic apparatus protein, NuMA; Lydersen, B. & Pettijohn, D. (1980) Cell 22, 489-499] colocalizes with splicing factors in interphase nuclei and is associated with small nuclear ribonucleoproteins in a complex immunoprecipitated from HeLa extract with small nuclear ribonucleoprotein antibodies. Moreover, NuMA associates with splicing complexes that are reconstituted in vitro using wild-type pre-mRNA, but not with nonspecific RNA. Cumulatively, these observations suggest a function of NuMA or NuMA-like proteins in interphase cells in providing a bridge between RNA processing and the nucleoskeleton.
Collapse
Affiliation(s)
- C Zeng
- Department of Cell Biology, Baylor College of Medicine, Houston, TX 77030
| | | | | | | |
Collapse
|
420
|
Lim HW, Behar S, He D. Effect of porphyrin and irradiation on heme biosynthetic pathway in endothelial cells. Photodermatol Photoimmunol Photomed 1994; 10:17-21. [PMID: 8180096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
To study porphyrin biosynthesis in human umbilical vein endothelial cells (EC), cultured EC were incubated with delta-aminolevulinic acid (ALA), the precursor of porphyrin synthesis, and porphyrins generated were measured spectrofluorometrically. EC accumulated porphyrins in an incubation time-dependent and ALA dose-dependent fashion. Porphyrin accumulation was enhanced by CaMg EDTA, a ferrochelatase inhibitor, suggesting the participation of ferrochelatase. The effect of porphyrin and irradiation on porphyrin accumulation was evaluated by exposing porphyrin-containing EC to the UVA and blue light, followed by incubation with ALA for 2-48 h. Decreased porphyrin accumulation 2-48 h after the irradiation was noted at all the time-points examined. However, no alteration of ferrochelatase activity was observed, suggesting that the decrease in porphyrin levels was due to suppression of the activity of the other enzymes in the earlier steps of the heme biosynthetic pathway.
Collapse
Affiliation(s)
- H W Lim
- Department of Veterans Affairs Medical Center, New York, NY 10010
| | | | | |
Collapse
|
421
|
Butler F, Fu X, Kalbfleisch G, Lambrecht M, Ross WR, Skubic P, Snow J, Wang PL, Wood M, Bortoletto D, Brown DN, Fast J, McIlwain RL, Miao T, Miller DH, Modesitt M, Schaffner SF, Shibata EI, Shipsey IP, Wang PN, Battle M, Ernst J, Kroha H, Roberts S, Sparks K, Thorndike EH, Wang CH, Dominick J, Sanghera S, Skwarnicki T, Stroynowski R, Artuso M, He D, Goldberg M, Horwitz N, Kennett R, Moneti GC, Muheim F, Mukhin Y, Playfer S, Rozen Y, Stone S, Thulasidas M, Vasseur G, Zhu G, Bartelt J, Csorna SE, Egyed Z, Jain V, Sheldon P, Akerib DS, Barish B, Chadha M, Chan S, Cowen DF, Eigen G, Miller JS, O'Grady C, Urheim J, Weinstein AJ, Acosta D, Athanas M, Masek G, Paar H. Analysis of hadronic transitions in Upsilon (3S) decays. Phys Rev D Part Fields 1994; 49:40-57. [PMID: 10016743 DOI: 10.1103/physrevd.49.40] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
422
|
Abstract
Using a monoclonal antibody 2D3 generated against a kinetochore-enriched human chromosome preparation, we identified a high molecular mass protein with nuclear staining in interphase and polar staining of the pericentriolar region in the mitotic spindle. Initially termed centrophilin, this protein associates with the minus-ends of spindle microtubules (MT) and appears to be important in spindle organization [Tousson et al., 1991: J. Cell Biol. 112:427-440]. Comparison of a partial cDNA sequence obtained for centrophilin with the full length cDNA sequence of nuclear mitotic apparatus protein (NuMA) [Compton et al., 1992: J. Cell Biol. 116:1395-1408; Yang et al., 1992: J. Cell Biol. 116:1303-1317] has indicated that NuMA and centrophilin are the same protein. Using a polyclonal NuMA antibody, we have provided further evidence that NuMA exists as isoforms as shown by peptide mapping and immunoblots. Sequential fractionation experiments along with immunofluorescence, immunoblotting, and EM immunogold labeling have demonstrated that NuMA isoforms are novel components of nuclear core filaments. Thus, NuMA, a long coiled-coil protein, appears to have dual functions in interphase and mitosis during the cell cycle. In interphase, NuMA likely plays a structural role in the nucleoskeleton that may be important in nuclear organization and functions, whereas in mitosis, NuMA appears to be associated with spindle MT organization and chromosome positioning.
Collapse
Affiliation(s)
- C Zeng
- Department of Cell Biology, Baylor College of Medicine, Houston, Texas
| | | | | |
Collapse
|
423
|
Battle M, Ernst J, Kroha H, Kwon Y, Roberts S, Sparks K, Thorndike EH, Wang CH, Dominick J, Sanghera S, Shelkov V, Skwarnicki T, Stroynowski R, Volobouev I, Zadorozhny P, Artuso M, He D, Goldberg M, Horwitz N, Kennett R, Moneti GC, Muheim F, Mukhin Y, Playfer S, Rozen Y, Stone S, Thulasidas M, Vasseur G, Zhu G, Bartelt J, Csorna SE, Egyed Z, Jain V, Sheldon P, Akerib DS, Barish B, Chadha M, Chan S, Cowen DF, Eigen G, Miller JS, O'Grady C, Urheim J, Weinstein AJ, Acosta D, Athanas M, Masek G, Paar H, Bean A, Gronberg J, Kutschke R, Menary S, Morrison RJ, Nakanishi S, Nelson HN, Nelson TK, Richman JD, Ryd A, Tajima H, Schmidt D, Sperka D, Witherell MS, Procario M, Yang S. Observation of B0 decay to two charmless mesons. Phys Rev Lett 1993; 71:3922-3926. [PMID: 10055109 DOI: 10.1103/physrevlett.71.3922] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
424
|
Abstract
Hepatic parenchymal cells in most adult mammals are polyploid, with most of the cells in the quiescent or low-proliferation state. Polyploidization has been related to carcinogenesis and aging, and both end points are significantly affected by dietary restriction (DR). Direct measures of hepatic nuclear polyploidization in DR B6C3F1 mice have not been examined. We examined the effect of DR on distributions of nuclear ploidy in both sexes and on different age groups of B6C3F1 mice. Differences between young and old male mice and between old male and female mice were also compared. Hepatic nuclear ploidy values were measured by flow cytometry. The DNA histograms were analyzed for the percentage of nuclei having different classes of DNA content by gating channels between the areas under the peaks of diploid, tetraploid, and octaploid. The results indicate that 1 or 26 months of DR started at 4 months of age did not alter hepatic nuclear ploidy distributions in young and old mice. Our data suggest that in the male mouse, polyploidization is established by 5 months of age for hepatic nuclei and that ploidy classes are affected by sex at 30 months of age. For females, effects in the octaploid nuclei are seen as a result of DR.
Collapse
Affiliation(s)
- M H Lu
- National Center for Toxicological Research, Jefferson, AR 72079-9502
| | | | | | | | | |
Collapse
|
425
|
Crawford G, Daubenmier CM, Fulton R, Fujino D, Gan KK, Honscheid K, Kagan H, Kass R, Lee J, Malchow R, Morrow F, Skovpen Y, Sung M, White C, Whitmore J, Wilson P, Butler F, Fu X, Kalbfleisch G, Lambrecht M, Ross WR, Skubic P, Snow J, Wang PL, Wood M, Bortoletto D, Brown DN, Fast J, McIlwain RL, Miao T, Miller DH, Modesitt M, Schaffner SF, Shibata EI, Shipsey IP, Wang PN, Battle M, Ernst J, Kroha H, Roberts S, Sparks K, Thorndike EH, Wang CH, Dominick J, Sanghera S, Skwarnicki T, Stoynowski R, Artuso M, He D, Goldberg M, Horwitz N, Kennett R, Moneti GC, Muheim F, Mukhin Y, Playfer S, Rozen Y, Stone S, Thulasidas M, Vasseur G, Zhu G, Bartelt J, Csorna SE, Egyed Z. Observation of the charmed baryon Sigma c+ and measurement of the isospin mass splittings of the Sigma c. Phys Rev Lett 1993; 71:3259-3262. [PMID: 10054928 DOI: 10.1103/physrevlett.71.3259] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
426
|
Bortoletto D, Brown DN, Fast J, McIlwain RL, Miao T, Miller DH, Modesitt M, Schaffner SF, Shibata EI, Shipsey IP, Wang PN, Battle M, Ernst J, Kroha H, Roberts S, Sparks K, Thorndike EH, Wang CH, Dominick J, Sanghera S, Skwarnicki T, Stroynowski R, Artuso M, He D, Goldberg M, Horwitz N, Kennett R, Moneti GC, Muheim F, Mukhin Y, Playfer S, Rozen Y, Stone S, Thulasidas M, Vasseur G, Zhu G, Bartelt J, Csorna SE, Egyed Z, Jain V, Sheldon P, Akerib DS, Barish B, Chadha M, Chan S, Cowen DF, Eigen G, Miller JS, O'Grady C, Urheim J, Weinstein AJ, Acosta D, Athanas M, Masek G, Ong B, Paar H, Sivertz M, Bean A, Gronberg J, Kutschke R, Menary S, Morrison RJ, Nakanishi S, Nelson HN. Measurement of the decay tau ---> pi - pi + pi -2 pi 0 nu tau. Phys Rev Lett 1993; 71:1791-1795. [PMID: 10054501 DOI: 10.1103/physrevlett.71.1791] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
427
|
Alam MS, Kim IJ, Nemati B, O'Neill J, Severini H, Sun CR, Zoeller MM, Crawford G, Daubenmier CM, Fulton R, Fujino D, Gan KK, Honscheid K, Kagan H, Kass R, Lee J, Malchow R, Morrow F, Skovpen Y, Sung M, White C, Whitmore J, Wilson P, Butler F, Fu X, Kalbfleisch G, Lambrecht M, Ross WR, Skubic P, Snow J, Wang PL, Wood M, Bortoletto D, Brown DN, Fast J, McIlwain RL, Miao T, Miller DH, Modesitt M, Schaffner SF, Shibata EI, Shipsey IP, Wang PN, Battle M, Ernst J, Kroha H, Roberts S, Sparks K, Thorndike EH, Wang CH, Dominick J, Sanghera S, Skwarnicki T, Stroynowski R, Artuso M, He D, Goldberg M, Horwitz N, Kennett R, Moneti GC, Muheim F, Mukhin Y, Playfer S, Rozen Y. Measurement of the ratio scrB(D+--> pi 0l+ nu )/scrB(D+-->K-bar0l+ nu ). Phys Rev Lett 1993; 71:1311-1315. [PMID: 10055508 DOI: 10.1103/physrevlett.71.1311] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
428
|
Lai J, Matisová E, He D, Singer E, Niki H. Evaluation of capillary gas chromatography for the measurement Of C2–C10 hydrocarbons in urban air samples for air pollution research. J Chromatogr A 1993. [DOI: 10.1016/0021-9673(93)80543-h] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
429
|
Abstract
To study porphyrin biosynthesis in normal human keratinocytes and A431 cells derived from human epidermoid carcinoma, cultured cells were incubated with delta-aminolevulinic acid (ALA), the precursor of porphyrin synthesis, and accumulation of porphyrins was measured spectrofluorometrically. Both human keratinocytes and A431 cells accumulated porphyrins in a time-dependent and a dose-dependent fashion. Protoporphyrin was the predominant porphyrin accumulated by both cell types. Porphyrin accumulation was enhanced by Ca Mg ethylenediaminetetraacetic acid, a ferrochelatase inhibitor, and the enhancement was reversed by the addition of iron, suggesting the utilization of iron by ferrochelatase. The effect of light on porphyrin accumulation was evaluated by exposing the ALA-loaded A431 cells to ultraviolet-A (UVA) and blue light radiation, followed by continued incubation with ALA for 2-48 h. There was an enhancement of porphyrin accumulation 2-48 h after the radiation as compared with nonirradiated controls. Consistent with this finding, ferrochelatase activity decreased in these cells at 24 h and 48 h. These data demonstrate that human keratinocytes and A431 cells are capable of porphyrin biosynthesis, and that exposure of porphyrin-containing A431 cells to light, which includes the Soret band spectrum, decreases the ferrochelatase activity, which is responsible, at least in part, for the further increase in porphyrin level.
Collapse
Affiliation(s)
- D He
- Dermatology Service, Department of Veterans Affairs Medical Center, New York, NY 10010
| | | | | |
Collapse
|
430
|
Abstract
Incubation of murine epidermal cells with delta-aminolevulinic acid (ALA) resulted in a dose- and time-dependent accumulation of porphyrins, predominantly of protoporphyrin. Porphyrin accumulation decreased in the presence of iron, and the iron-mediated decrease was partially reversed by CaMg EDTA (1.25-10.0 mM), suggesting that there is functionally active ferrochelatase in these cells. This study suggests that these cells may be a useful model for the study of cutaneous porphyrin metabolism involving ferrochelatase activity.
Collapse
Affiliation(s)
- D He
- Dermatology Service, Department of Veterans Affairs Medical Center, New York, NY 10010
| | | | | | | |
Collapse
|
431
|
Abstract
We have used an anhepatic dog model to demonstrate the efficacy of a bioartificial liver assist device. Six dogs underwent total hepatectomy. Three received only medical care (controls) while the remainder were connected to an extracorporeal liver assist device (ELAD). The control dogs failed to regain consciousness after anesthesia although all lived 4-5 h postoperatively. Plasma ammonia concentration increased by an average of 250 mumol/L between the end of surgery and the demise of the animals. The treated dogs lived 3-12.5 h, and 2 of them required repeated doses of thiamylal sodium to maintain sedation. Plasma ammonia concentration was unchanged after connection to the ELAD except in the longest survivor, whose ammonia began to rise after 8 h on the ELAD. The short survival in the other 2 treated dogs was the result of uncontrolled intraabdominal bleeding. This device is capable of replacing the metabolic function of the liver, and might provide hepatic support in patients awaiting transplantation or in fulminant hepatic failure.
Collapse
Affiliation(s)
- J H Kelly
- Department of Pathology, Baylor College of Medicine, Houston, TX 77030, USA
| | | | | | | | | | | | | |
Collapse
|
432
|
Wang X, Xie W, Long Q, He D, Lin G, Pang Y, Pu Z. Stimulation of thymidine kinase activity in baculovirus infected cells is not due to a virus-coded enzyme. Arch Virol 1992; 127:315-9. [PMID: 1333755 DOI: 10.1007/bf01309593] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A polyhedrin-positive recombinant autographa californica nuclear polyhedrosis virus (AcNPV) carrying a herpes simplex virus thymidine kinase gene under the control of the SynXIV promoter, a fusion of synthetic and linker-modified polyhedrin promoters, has been constructed. When this recombinant baculovirus was used to infect a variant of Spodoptera frugiperda cells deficient in thymidine kinase (TK-), a high level of TK activity was detected. These results, in conjunction with the demonstration that AcNPV could replicate in TK- S. frugiperda cells and no TK activity was found throughout infection, imply that the wild type virus-stimulated TK activity observed in S. frugiperda (TK+) cells is not contributed by a virus-coded enzyme.
Collapse
Affiliation(s)
- X Wang
- Institute of Entomology, Zhongshan University, Guangzhou, People's Republic of China
| | | | | | | | | | | | | |
Collapse
|
433
|
Abstract
This study investigated the effect of radiation on clinical and histologic changes, and on cutaneous eicosanoid metabolism, in Skh:HR-1 hairless albino mice rendered protoporphyric by the administration of collidine. At 0.1-18 h after exposure to 12 kJ/m2 of 396-406 nm irradiation, thicknesses of back skin and ears were measured, and histologic changes were evaluated by using hematoxylin and eosin (H-E) and Giemsa's stains. Activities of eicosanoid-metabolizing enzymes in epidermal and dermal homogenates were assessed by incubating the tissue homogenates with 3H-AA, followed by quantitation of the eicosanoids generated by radio-TLC. In irradiated protoporphyric mice, an increase of back-skin thickness was noted at 0.1 h, reaching a peak at 18 h, whereas maximal increase in ear thickness was observed at 12 h. Histologic changes included dermal edema, increased mast cell degranulation, and mononuclear cells in the dermis. In these irradiated protoporphyric animals, generations of 6 keto-PGF1a, PGF2a, PGE2, PGD2, and HETE by epidermal eicosanoid-metabolizing enzymes were markedly suppressed at all the timepoints studied. Dermal eicosanoid-metabolizing enzymes of irradiated protoporphyric mice generated increased amounts of PGE2 and HETE at 18 h, probably reflecting the presence of dermal cellular infiltrates. The suppression of the activities of epidermal eicosanoid-metabolizing enzymes was prevented by intraperitoneal injection of WR-2721, a sulfhydryl group generator, prior to irradiation, suggesting that the suppression was secondary to photo-oxidative damage of the enzymes during the in vivo phototoxic response. These results suggest that the effect of protoporphyrin and radiation on cutaneous eicosanoid metabolism in this animal model in vivo is that of a down regulation of the activities of epidermal eicosanoid-metabolizing enzymes.
Collapse
Affiliation(s)
- D He
- Department of Veterans Affairs Medical Center, New York, NY 10010
| | | |
Collapse
|
434
|
Abstract
To evaluate further the interactions of C5a and mast cells in cutaneous inflammation, the ability of human native C5a (nC5a) (10 to 500 ng/ml) and human recombinant C5a (rC5a) (10 ng/ml to 100 ng/ml) to induce histamine release from purified BALB/c cutaneous mast cells (CMC) and peritoneal mast cells (PMC) was analyzed. It was found that nC5a induced histamine release from CMC but not from PMC, with a maximal net release at 250 ng/ml nC5a (22.8 +/- 2.6%). Kinetic experiments demonstrated that nC5a-induced maximal net histamine release occurred 5 min after the presentation of this stimulus (25.8 +/- 6.0%). Using rC5a and CMC, dose-response studies indicated a maximal net release of 7.0 +/- 1.7% at rC5a of 10 ng/ml, and kinetic studies showed a maximal net release at 5 min of incubation (12.9 +/- 1.6%). Release induced by rC5a was calcium-dependent, and peaked at 30 degrees C. These results indicate that functional heterogeneity exists between the CMC and the PMC of BALB/c mice, that C5a is a relevant stimulus for characterization of this heterogeneity, and that CMC from these animals can serve as a convenient in vitro model for the study of human C5a-mast cell interactions. In vivo, injections of nC5a (25-100 ng) and rC5a (25-100 ng) into the skin of BALB/c mice induced an increase in cutaneous vasopermeability, as assessed by the extravasation of intravenously injected 125I-bovine serum albumin. nC5a induced a dose-dependent increase in vasopermeability, whereas alterations induced by rC5a plateaued at 50 ng. The C5a-induced vasopermeability was markedly enhanced in animals that had been previously treated with an inhibitor of serum carboxypeptidase, which converts C5a to the less potent derivative, C5a des Arg. These findings suggest that carboxypeptidase plays an important role in vivo in the modulation of C5a-induced cutaneous inflammation in murine skin.
Collapse
Affiliation(s)
- H W Lim
- Dermatology Service, Department of Veterans Affairs Medical Center, New York, NY 10010
| | | | | | | | | |
Collapse
|
435
|
Spektor DM, Thurston GD, Mao J, He D, Hayes C, Lippmann M. Effects of single- and multiday ozone exposures on respiratory function in active normal children. Environ Res 1991; 55:107-22. [PMID: 1868814 DOI: 10.1016/s0013-9351(05)80167-7] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Ventilatory function was measured twice daily on 46 healthy children aged 8-14 years on at least 7 days for each child during a 4-week period at a northwestern New Jersey residential summer camp in 1988. The highest 1-hr O3 concentration was 150 ppb, while the highest 12-hr H+ concentration (as H2SO4) was 18.6 micrograms/m3. The highest temperature-humidity index was 81 degrees F. The regressions of FVC, FEV1, FEF25-75, and PEFR on O3 in the hour preceding the afternoon function measurements yielded slopes essentially the same as those measured on other children at the same camp in 1984. Regressions of the changes in function between the late morning and late afternoon function measurements on average O3 concentration between them produced significant, but somewhat smaller effects, while regressions of morning function on O3 during the previous day indicated small but still significant effects. There were no significant correlations with other measured environmental variables including H+. Based on the results of this study and similar previous studies, we conclude that O3 exposures in ambient air produce greater lung function deficits in active young people in natural settings then does pure O3 in controlled chamber exposure studies because of: (1) longer exposures; (2) potentiation by other factors in the ambient exposures; (3) the persistence of effects from prior day's exposures; and (4) the persistence of a transient response associated with the daily peak of exposure. It follows that projections of likely effects in the real world from controlled chamber exposure studies should either have a large margin of safety, or the judgment of the extent of effects likely to occur among populations should be based directly on the effects observed in field studies.
Collapse
Affiliation(s)
- D M Spektor
- Institute of Environmental Medicine, New York University Medical Center, Tuxedo 10987
| | | | | | | | | | | |
Collapse
|
436
|
He D. Small cities and towns in Liaoning Province: their development and classification. Chin J Popul Sci 1991; 3:137-43. [PMID: 12317651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
|
437
|
Abstract
To investigate the functional heterogeneity of mouse mast cells, we extracted and purified cutaneous and peritoneal mast cells from 10- to 18-week-old BALB/c mice and compared their responses to secretagogues. Cutaneous mast cells (CMC) were extracted from mouse ears after digestion with hyaluronidase and collagenase in MEM containing 25% fetal calf serum and purified on a discontinuous Percoll gradient. The histamine content of cells obtained from the 30/40% interface was 1.0 +/- 0.1 pg/cell (mean +/- SE), with a mast-cell purity of 68.6 +/- 4.4% and a viability of greater than 93%. Peritoneal mast cells (PMC) were obtained by lavage with modified Tyrode's buffer followed by purification on 22.5% and 3-9% metrizamide gradients. The histamine content of cells was 12.2 +/- 0.8 pg/cell, with a mast-cell purity of 95.9 +/- 0.6% and a viability of greater than 95%. Histamine release induced by A23187 from CMC peaked at 3.0 microM A23187 (19.1 +/- 4.2%), at 3.0 min (22.3 +/- 2.3%), and at 30 degrees C (17.6 +/- 2.6%). In contrast, histamine release from PMC peaked at 8.0 microM of A23187 (49.4 +/- 12.1%) and at 15.0 min (48.5 +/- 12.2%). Release of histamine from PMC was observed at all the temperatures tested from 22 to 45 degrees C. Histamine release from CMC and PMC induced by A23187 was calcium dependent. Histamine release induced by compound 48/80 from CMC peaked at 0.5 micrograms/ml of compound 48/80 (23.0 +/- 7.4%) and at 5.0 min incubation (16.3 +/- 2.0%), whereas release from PMC peaked at 10.0 micrograms/ml (31.9 +/- 2.6%); release from PMC was similar at all the time points examined (1-15 min). Histamine release induced by substance P (SP) from both CMC and PMC peaked at 5.0 microM (18.8 +/- 6.6% and 12.6 +/- 3.7%, respectively); however, the maximal release from CMC occurred at 3.0 min (18.2 +/- 3.2%) and from PMC at 30.0 min (11.4 +/- 2.0%). SP-induced histamine release from CMC was calcium dependent, whereas release from PMC was only partially inhibited by EDTA. This study demonstrated that functional heterogeneity exists between these two populations of mast cells.
Collapse
Affiliation(s)
- D He
- Dermatology Service, New York Veterans Administration Medical Center, New York 10010
| | | | | | | |
Collapse
|
438
|
Lu SJ, He D, Huang HL, Huang XY. [Enhancing effect of danggui injection on immunologic function]. Zhongguo Zhong Yao Za Zhi 1989; 14:685-7, 704. [PMID: 2695109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Experiments have shown that Danggui injection enhances phagocytic function of macrophage in normal mice, and antagonizes the immunosuppressive activity of macrophage by cytoxan. The injection may increase the function of B cells and the activity of serum lysozyme, thus increasing the function of humoral immunity and nonspecific immunity.
Collapse
|
439
|
Trybula Z, Schmidt VH, Drumheller JE, He D, Li Z. Dielectric measurements of the proton-glass state in Rb0.65(NH4)0.35H2AsO4. Phys Rev B Condens Matter 1989; 40:5289-5291. [PMID: 9992554 DOI: 10.1103/physrevb.40.5289] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
440
|
He D, Soter NA, Lim HW. The late phase of hematoporphyrin derivative-induced phototoxicity in mice: release of histamine and histologic changes. Photochem Photobiol 1989; 50:91-5. [PMID: 2474837 DOI: 10.1111/j.1751-1097.1989.tb04133.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
This study was designed to directly examine the role of mast cells and the histologic changes in the late phase (4-48 h) of hematoporphyrin derivative-induced phototoxicity. BALB/c mice were rendered phototoxic by intraperitoneal injection of HpD, followed by exposure to 1.59 kJ/m2 of 396-406 nm radiation. Immediately before radiation, and at 4, 8, 12, 18, 24 and 48 h after radiation, the ear thickness, serum histamine levels and histologic changes of ears were examined. A maximal net increase in ear thickness of 33.5 +/- 0.3 X 10(-2) mm (mean +/- SE) was noted at 12 h, associated with a maximal net increase of serum histamine (43.3 +/- 11.6 ng/ml, mean +/- SE), and a maximal mast cell degranulation. Other histologic changes consisted of mild epidermal spongiosis at 18-24 h, and a predominant neutrophilic infiltrate, which peaked at 24 h (211.6 +/- 0.4 cells/mm2). No significant alteration was observed in control mice. These data indicated that mast cells participate in the late phase of HpD-induced phototoxicity in mice.
Collapse
|
441
|
Sarachik MP, Roy A, Turner M, Levy M, He D, Isaacs LL, Bhatt RN. Scaling behavior of the magnetization of insulating Si:P. Phys Rev B Condens Matter 1986; 34:387-390. [PMID: 9939273 DOI: 10.1103/physrevb.34.387] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
|
442
|
He D. [Testing of lung function during exercise in healthy adults]. Zhonghua Jie He He Hu Xi Xi Ji Bing Za Zhi 1984; 7:162-5, 192. [PMID: 6518931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
|