51
|
Miller T, Samsavar A, Chiang T. Photoexcitation of resonances in Ag films on Ni(111). PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:17686-17689. [PMID: 9976191 DOI: 10.1103/physrevb.50.17686] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
52
|
Sieger MT, Roesler JM, Lin D, Miller T, Chiang T. Holography of Ge(111)-c(2 x 8) by surface core-level photoemission. PHYSICAL REVIEW LETTERS 1994; 73:3117-3120. [PMID: 10057292 DOI: 10.1103/physrevlett.73.3117] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
53
|
Chiang T, Miller T, McMahon WE. Ag-Au superlattice band structure. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:11102-11106. [PMID: 9975220 DOI: 10.1103/physrevb.50.11102] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
54
|
Lin MH, Hsieh SC, Li SY, Shih HC, Chiang T, McBride J, Todd R, Chou LS, Chou MY, Wong DT. Sequential cytogenetic alterations in hamster oral keratinocytes during DMBA-induced oral carcinogenesis. EUROPEAN JOURNAL OF CANCER. PART B, ORAL ONCOLOGY 1994; 30B:252-64. [PMID: 7950840 DOI: 10.1016/0964-1955(94)90007-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Using the hamster cheek pouch oral cancer model, we have performed a comprehensive analysis of the cytogenetic changes in hamster oral keratinocytes during 7,12-dimethylbenz[a]anthracene (DMBA)-induced carcinogenesis. Tumour induction in the hamster cheek pouch required repeated application of the carcinogen for 14 weeks. We have found that this hamster oral cancer model to be suitable for cytogenetic studies. Unlike human oral cancers where chromosome breaks have been shown, this is only infrequently observed in DMBA-treated hamster oral keratinocytes. Of importance is the finding that at the beginning of the second week of DMBA treatment, there is a significant increase of karyotypes demonstrating tetraploid or near-tetraploidy. We propose that the significant increase in hamster oral keratinocytes exhibiting tetraploidy be further evaluated as a marker of premalignancy/malignancy.
Collapse
|
55
|
Carlisle JA, Miller T, Chiang T. Carlisle et al. reply. PHYSICAL REVIEW LETTERS 1994; 72:3741. [PMID: 10056283 DOI: 10.1103/physrevlett.72.3741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
56
|
Carlisle JA, Miller T, Chiang T. Ge chemisorption and alloying on the Si(111)-(7 x 7) surface. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:13600-13606. [PMID: 10010297 DOI: 10.1103/physrevb.49.13600] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
57
|
McMahon WE, Mueller MA, Miller T, Chiang T. Controlled electronic coupling between two quantum wells: A photoemission study of noble-metal systems. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:10426-10431. [PMID: 10009865 DOI: 10.1103/physrevb.49.10426] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
58
|
Lin D, Hirschorn ES, Miller T, Chiang T. Adsorption, thermal reaction, and desorption of disilane on Ge(111)-c(2 x 8). PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:1836-1843. [PMID: 10010979 DOI: 10.1103/physrevb.49.1836] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
59
|
Barna BP, Thomassen MJ, Maier M, Medendorp SV, Tubbs RR, Chiang T, Zhou P, Yen-Lieberman B, Singh-Burgess S, Deodhar SD. Combination therapy with a synthetic peptide of C-reactive protein and interleukin 2: augmented survival and eradication of pulmonary metastases. Cancer Immunol Immunother 1994; 38:38-42. [PMID: 8299117 PMCID: PMC11038352 DOI: 10.1007/bf01517168] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/1993] [Accepted: 08/24/1993] [Indexed: 01/29/2023]
Abstract
A synthetic peptide (RS-83277) derived from the structure of human C-reactive protein (CRP) was previously shown to have antitumor activity in three different murine tumor models when administered in multilamellar vesicles (MLV). The therapeutic effects were comparable to those seen with MLV-encapsulated native CRP. The present study evaluated the therapeutic and immunomodulatory effects of administering CRP peptide RS-83277 MLV simultaneously with low-dose recombinant interleukin-2 (IL-2) to C57Bl/6 mice bearing established pulmonary metastases of fibrosarcoma T241. Results demonstrated that the capacity of RS-83277 MLV to inhibit tumor metastases and prolong survival was significantly augmented by combination with 10,000 U/day IL-2 i.p. Treated animals showed no evidence of toxicity. By immunohistochemistry, increased Thy 1.2+ cells were detectable in lungs of RS-83277 MLV/IL-2-treated animals compared to those receiving RS-83277 MLV alone. Circulating tumor necrosis factor alpha (TNF) and interferon (IFN) were not detectable in animals receiving RS-83277 MLV alone, but TNF was significantly elevated in animals receiving IL-2. In the presence of combination therapy, however, circulating TNF was not detectable. Results suggest that the combination of synthetic CRP peptide RS-83277 MLV and low-dose IL-2 offers a therapeutic advantage over either agent alone.
Collapse
|
60
|
Carlisle JA, Sieger MT, Miller T, Chiang T. Extended photoemission fine structure analysis of the Si(111)-(7 x 7) surface core levels. PHYSICAL REVIEW LETTERS 1993; 71:2955-2958. [PMID: 10054821 DOI: 10.1103/physrevlett.71.2955] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
61
|
Lin D, Miller T, Chiang T, Tsu R, Greene JE. Thermal reactions of disilane on Si(100) studied by synchrotron-radiation photoemission. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:11846-11850. [PMID: 10007524 DOI: 10.1103/physrevb.48.11846] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
62
|
McMahon WE, Miller T, Chiang T. Avoided crossings of Au(111)/Ag/Au/Ag double-quantum-well states. PHYSICAL REVIEW LETTERS 1993; 71:907-910. [PMID: 10055398 DOI: 10.1103/physrevlett.71.907] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
63
|
Carlisle JA, Miller T, Chiang T. Angle-resolved photoemission study of the submonolayer phases of Pb on Ge(111). PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:10342-10347. [PMID: 10005143 DOI: 10.1103/physrevb.47.10342] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
64
|
Lin D, Miller T, Chiang T. Adsorption and thermal reactions of disilane and the growth of Si films on Ge(100)-(2 x 1). PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:6543-6554. [PMID: 10004622 DOI: 10.1103/physrevb.47.6543] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
65
|
Hong H, Aburano RD, Hirschorn ES, Zschack P, Chen H, Chiang T. Interaction of (1 x 2)-reconstructed Si(100) and Ag(110):Cs surfaces with C60 overlayers. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:6450-6454. [PMID: 10004611 DOI: 10.1103/physrevb.47.6450] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
66
|
Carlisle JA, Miller T, Chiang T. Photoemission study of Pb on Ge(111). PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:3790-3796. [PMID: 10006484 DOI: 10.1103/physrevb.47.3790] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
67
|
Hussein N, Chiang T, Ehsan Q, Hussain R. Intraocular pressure decrease in household contacts of patients with Hansen's disease and endemic control subjects. Am J Ophthalmol 1992; 114:479-83. [PMID: 1415460 DOI: 10.1016/s0002-9394(14)71861-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We compared the intraocular pressure in 150 urban household contacts of patients with Hansen's disease and 132 endemic control subjects from an urban population in Karachi, Pakistan, who were matched in regard to race, age, gender, and socioeconomic status. The mean intraocular pressure in the upright position was 12.6 mm Hg in the right eye and 12.9 mm Hg in the left eye in household contacts of patients with Hansen's disease and 15.3 mm Hg in the right eye and 15.4 mm Hg in the left eye in the endemic control population (P < .0005). The postural change in intraocular pressure from the upright to supine position was 1.7 mm Hg in the right eye and 2.1 mm Hg in the left eye in the household contacts group and 1.3 mm Hg in the right eye and 1.5 mm Hg in the left eye in the endemic control group (P < .0006). Our findings, especially in view of past observations in intraocular pressure changes in patients with Hansen's disease, raise serious questions about possible early ocular susceptibility to Mycobacterium leprae infection and about public health issues, including possible early indication of disease.
Collapse
|
68
|
Weber MW, Van Soest A, Neff G, Chiang T, Pfau R. Results of surgical procedures for the correction of foot-drop and of lagophthalmus due to leprosy. LEPROSY REV 1992; 63:255-62. [PMID: 1406020 DOI: 10.5935/0305-7518.19920030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Leprosy mutilations of the muscles and skeleton can be relieved by reconstructive surgery, but evaluation of the results of these operations is seldom undertaken. Between 1975 and 1984, 59 leprosy patients were operated on at the Marie Adelaide Leprosy Centre, Karachi, Pakistan, for lagophthalmus with the transposition of the posterior tibial muscle. We were able to re-examine 39 patients: tibialis posterior transposition was performed 25 times, and temporalis transposition was carried out 33 times; 18 of the 25 patients with the tibialis posterior transposition were pleased with the result, 7 were not: 21 patients could extend their feet above the neutral position; 24 of the patients with the temporalis transposition were satisfied, 9 were not: complete closure was demonstrated in 21 eyes; Persistent corneal damage was noted in 15 eyes; 12 of the 23 male patients cared for themselves, 16 lived with their families; 7 of the 8 female patients lived with their families. The results of the rehabilitation, in relation to the degree of mutilation, are considered satisfactory for a developing country. These surgical procedures give a good result, provided they are followed by intensive physiotherapy.
Collapse
|
69
|
Franklin GE, Miller T, Chiang T. Growth phases of ZnTe on GaSb(100). PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:3940-3947. [PMID: 10004122 DOI: 10.1103/physrevb.46.3940] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
70
|
Lin D, Carlisle JA, Miller T, Chiang T. Lin et al. reply. PHYSICAL REVIEW LETTERS 1992; 69:552-553. [PMID: 10046969 DOI: 10.1103/physrevlett.69.552] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
71
|
Arain GM, Alam SE, Chiang T. Leprosy in Karachi. J PAK MED ASSOC 1992; 42:160-1. [PMID: 1404834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
|
72
|
Miller T, Chiang T. Study of a surface state in a Ag-Au superlattice gap. PHYSICAL REVIEW LETTERS 1992; 68:3339-3342. [PMID: 10045677 DOI: 10.1103/physrevlett.68.3339] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
73
|
Lin D, Miller T, Chiang T. Si indiffusion on Ge(100)-(2 x 1) studied by core-level photoemission. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:11415-11418. [PMID: 10001084 DOI: 10.1103/physrevb.45.11415] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
74
|
Lin D, Hirschorn ES, Chiang T, Tsu R, Lubben D, Greene JE. Scanning-tunneling-microscopy studies of disilane adsorption and pyrolytic growth on Si(100)-(2x1). PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:3494-3498. [PMID: 10001926 DOI: 10.1103/physrevb.45.3494] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
75
|
Carlisle JA, Miller T, Chiang T. Atomic origins of surface core levels on Si(111)-(7 x 7) studied by site-dependent Ge substitution. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:3811-3814. [PMID: 10001970 DOI: 10.1103/physrevb.45.3811] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
76
|
Carlisle JA, Miller T, Chiang T. Photoemission study of the growth, desorption, Schottky-barrier formation, and atomic structure of Pb on Si(111). PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:3400-3409. [PMID: 10001914 DOI: 10.1103/physrevb.45.3400] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
77
|
Franklin GE, Rich DH, Hong H, Miller T, Chiang T. Interface formation and growth of InSb on Si(100). PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:3426-3434. [PMID: 10001917 DOI: 10.1103/physrevb.45.3426] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
78
|
Hong H, Aburano RD, Lin D, Chen H, Chiang T, Zschack P, Specht ED. X-ray scattering study of Ag/Si(111) buried interface structures. PHYSICAL REVIEW LETTERS 1992; 68:507-510. [PMID: 10045914 DOI: 10.1103/physrevlett.68.507] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
79
|
Lin D, Miller T, Chiang T. Bonding of Cs on Si and Ge surfaces studied by core-level spectroscopy. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:10719-10723. [PMID: 9999096 DOI: 10.1103/physrevb.44.10719] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
80
|
Leibsle FM, Hirschorn ES, Samsavar A, Miller T, Chiang T. Adsorption of Sb on Ge(110) studied by photoemission and scanning tunneling microscopy. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:8115-8120. [PMID: 9998743 DOI: 10.1103/physrevb.44.8115] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
81
|
Lin D, Miller T, Chiang T. Dimer charge asymmetry determined by photoemission from epitaxial Ge on Si(100)-(2 x 1). PHYSICAL REVIEW LETTERS 1991; 67:2187-2190. [PMID: 10044361 DOI: 10.1103/physrevlett.67.2187] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
82
|
Hirschorn ES, Leibsle FM, Chiang T. Scanning-tunneling-microscopy studies of the oxidation of Ge(111)-c(2 x 8). PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:5603-5605. [PMID: 9998399 DOI: 10.1103/physrevb.44.5603] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
83
|
Hirschorn ES, Lin DS, Leibsle FM, Samsavar A, Chiang T. Charge transfer and asymmetry on Ge(111)-c(2 x 8) studied by scanning tunneling microscopy. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:1403-1406. [PMID: 9999665 DOI: 10.1103/physrevb.44.1403] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
84
|
Todd R, Donoff BR, Chiang T, Chou MY, Elovic A, Gallagher GT, Wong DT. The eosinophil as a cellular source of transforming growth factor alpha in healing cutaneous wounds. THE AMERICAN JOURNAL OF PATHOLOGY 1991; 138:1307-13. [PMID: 2053590 PMCID: PMC1886395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Epidermal growth factor (EGF) and transforming growth factor-alpha (TGF-alpha) are known to promote the healing of epithelial wounds. Eosinophils are present in healing wounds and have recently been shown to be capable of producing TGF-alpha. This investigation was done to determine if eosinophils infiltrated into healing wounds are capable of expressing this cytokine. Using the rabbit cutaneous open wound model, the study found that the eosinophil is one of the predominant cell types in the healing wound, beginning from the seventh day and thereafter. Most surprisingly, the majority of the eosinophils present in the healing wound were found to contain TGF-alpha mRNA and protein by in situ hybridization and immunohistochemistry. Thus it is proposed that the delivery of TGF-alpha by eosinophils to epithelial wound healing sites represents a normal body mechanism whereby this multifunctional cytokine can accelerate the wound healing process.
Collapse
|
85
|
Mueller MA, Hirschorn ES, Miller T, Chiang T. Minimum overlayer thickness for interface formation: An experimental study of the Cu/Ag/Cu(111) system. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 43:11825-11828. [PMID: 9996955 DOI: 10.1103/physrevb.43.11825] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
86
|
Chiang T, McBride J, Chou MY, Nishimura I, Wong DT. Molecular cloning of the complementary DNA encoding for the hamster TGF-alpha mature peptide. Carcinogenesis 1991; 12:529-32. [PMID: 2009597 DOI: 10.1093/carcin/12.3.529] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The expression of transforming growth factor alpha (TGF-alpha) is consistently associated with the malignant transformation of oral mucosal tissues in both hamster and human. The cheek pouch of the Syrian hamster represents an ideal model to elucidate the role of TGF-alpha in epithelial cancer development. A prerequisite for such investigations at the molecular level is to obtain hamster-specific TGF-alpha molecular probes. Here we report the successful cloning of the hamster TGF-alpha cDNA from a hamster oral cancer cell line (HCPC-1) by the polymerase chain reaction technique using synthetic oligonucleotide primers based on human TGF-alpha cDNA sequence. Analysis of the nucleotide sequence of the newly isolated hamster cDNA encoding the portion of the mature TGF-alpha peptide revealed that it is 92.6% (139/150) homologous to that of the rat and 93.3% (140/150) homologous to that of the human sequences. The predicted hamster TGF-alpha amino acid sequence is 96% (48/50) similar to that of human, while 94% (47/50) similar to that of rat. Using this hamster TGF-alpha cDNA as a probe, molecular hybridization experiments revealed that it detects hamster TGF-alpha mRNA with approximately 40 times and approximately 5 times greater sensitivity than similar probes from human and rat origin respectively. This hamster TGF-alpha cDNA should be of great value as a probe to evaluate the role of TGF-alpha in the normal and pathological processes using the hamster as an experimental model.
Collapse
|
87
|
Elovic A, Galli SJ, Weller PF, Chang AL, Chiang T, Chou MY, Donoff RB, Gallagher GT, Matossian K, McBride J. Production of transforming growth factor alpha by hamster eosinophils. THE AMERICAN JOURNAL OF PATHOLOGY 1990; 137:1425-34. [PMID: 2124414 PMCID: PMC1877717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Previously it was demonstrated that malignant transformation of the Syrian hamster cheek pouch mucosa is associated with the expression of TGF-alpha. Therefore in situ hybridization and immunohistochemistry was used to investigate the cellular sources of TGF-alpha production in this model system. Surprisingly one cell type in the inflammatory infiltrate present in the connective tissue adjacent to the transformed epithelium represented a major source of TGF-alpha mRNA. Detailed analysis of these cells revealed that they were eosinophils. In addition to TGF-alpha mRNA, about 40% of the eosinophils associated with the oral tumors exhibited TGF-alpha product reactive with a monoclonal antibody against the C terminus of the mature TGF-alpha peptide. Normal hamster bone marrow eosinophils also exhibited TGF-alpha mRNA and product by in situ hybridization and immunohistochemistry. These results suggest that the eosinophil represents a biologically significant source of TGF-alpha.
Collapse
|
88
|
Samsavar A, Miller T, Chiang T. Correlation between surface core levels and surface states in Si(111)-(7 x 7) probed by Ag adsorption. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 42:9245-9247. [PMID: 9995159 DOI: 10.1103/physrevb.42.9245] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
89
|
Tien SL, Ong YW, Lim SH, Chiang T. Yields of fibronectin by heparin-cold-precipitation from plasma. ANNALS OF THE ACADEMY OF MEDICINE, SINGAPORE 1990; 19:831-2. [PMID: 2130748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Fibronectin prepared by heparin-cold-precipitation from 10 packs each of 24-hour plasma, stored plasma and 6-hour frozen plasma was assayed by electroimmunodiffusion. Its yield obtained from 24-hour plasma was significantly higher than that from stored plasma (p less than 0.01) indicating a decline with storage. Freezing of plasma within 6 hours retards degradation of fibronectin. Therefore, 24-hour plasma or 6-hour frozen plasma should be used to prepare fibronectin in order to achieve a better yield.
Collapse
|
90
|
Samsavar A, Hirschorn ES, Miller T, Leibsle FM, Eades JA, Chiang T. High-resolution imaging of a dislocation on Cu(111). PHYSICAL REVIEW LETTERS 1990; 65:1607-1610. [PMID: 10042313 DOI: 10.1103/physrevlett.65.1607] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
91
|
Wong DT, Weller PF, Galli SJ, Elovic A, Rand TH, Gallagher GT, Chiang T, Chou MY, Matossian K, McBride J. Human eosinophils express transforming growth factor alpha. J Exp Med 1990; 172:673-81. [PMID: 1696954 PMCID: PMC2188564 DOI: 10.1084/jem.172.3.673] [Citation(s) in RCA: 163] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Transforming growth factor alpha (TGF-alpha) is a pleuripotential cytokine with diverse biological effects, including the ability to influence the proliferation of normal cells or neoplastic epithelial cells. Eosinophils are a subset of granulocytes that normally enter the peripheral tissues, particularly those beneath gastrointestinal, respiratory, and urogenital epithelium, where they reside in close proximity to the epithelial elements. In this study, we demonstrate that the great majority of eosinophils infiltrating the interstitial tissues adjacent to two colonic adenocarcinomas and two oral squamous cell carcinomas labeled specifically by in situ hybridization with a 35S-riboprobe for human TGF-alpha (hTGF-alpha). No other identifiable leukocytes in these lesions contained detectable hTGF-alpha mRNA. We also examined leukocytes purified from a patient with the idiopathic hypereosinophilic syndrome. 80% of these eosinophils, but none of the patient's neutrophils or mononuclear cells, were positive for hTGF-alpha mRNA by in situ hybridization, and 55% of these eosinophils were positive by immunohistochemistry with a monoclonal antibody directed against the COOH terminus of the mature hTGF-alpha peptide. Finally, the identification of the purified eosinophil-associated transcript as hTGF-alpha was confirmed by polymerase chain reaction product restriction enzyme analysis followed by Southern blot hybridization. In contrast to eosinophils from the patient with hypereosinophilic syndrome, the peripheral blood eosinophils from only two of seven normal donors had detectable TGF-alpha mRNA and none of these eosinophils contained immunohistochemically detectable TGF-alpha product. Taken together, these findings establish that human eosinophils can express TGF-alpha, but suggest that the expression of TGF-alpha by eosinophils may be under microenvironmental regulation. Demonstration of TGF-alpha production by tissue-infiltrating eosinophils and the eosinophils in the hypereosinophilic syndrome identifies a novel mechanism by which eosinophils might contribute to physiological, immunological, and pathological responses.
Collapse
|
92
|
Franklin GE, Rich DH, Samsavar A, Hirschorn ES, Leibsle FM, Miller T, Chiang T. Photoemission and scanning-tunneling-microscopy study of GaSb(100). PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 41:12619-12627. [PMID: 9993736 DOI: 10.1103/physrevb.41.12619] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
93
|
Mueller MA, Miller T, Chiang T. Determination of the bulk band structure of Ag in Ag/Cu(111) quantum-well systems. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 41:5214-5220. [PMID: 9994381 DOI: 10.1103/physrevb.41.5214] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
94
|
Rich DH, Miller T, Chiang T. Electronic and chemical properties of In and Sb adsorbed on Ge(100) studied by synchrotron photoemission. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 41:3004-3016. [PMID: 9994071 DOI: 10.1103/physrevb.41.3004] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
95
|
Lee JS, Ong R, Yoo TJ, Chiang T. Binding of platelet activating factor by isolated membranes from U937 cells. Cell Immunol 1990; 125:415-25. [PMID: 2153465 DOI: 10.1016/0008-8749(90)90095-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Platelet activating factor (PAF), 1-O-alkyl-2-acetyl-sn-glycero-3-phosphocholine (1-O-alkyl-2-acetyl-GPC) has been known to have biological effect on cells. The mechanisms of the effect of the potent phospholipid on cells has not been established. We have used 1-O-[3H]alkyl-2-acetyl-GPC [( 3H]PAF) to study the interaction on the isolated membranes of U937 cells. The binding process was time, protein concentration, temperature dependent and reversible. The binding of [3H]PAF to the U937 cell membranes was slightly inhibited by the addition of PAF analogue, 3-O-Hexadecyl-2-acetyl-sn-glycerol-1-phosphorylcholine. U937 cell membranes showed high affinity binding sites for PAF with equilibrium dissociation constant (Kd) of 5 x 10(-9) M. The displacement of bound [3H]PAF with 500-fold excess of nonlabeled PAF was not altered suggesting that the bound [3H]PAF was not degraded during the binding. Binding of [3H]PAF on U937 cell membranes was inhibited by PAF antagonist, 59227RP. The kinetic of the inhibition by PAF antagonist is competitive suggesting that PAF and PAF antagonist bind at the same site.
Collapse
|
96
|
Samsavar A, Hirschorn ES, Leibsle FM, Chiang T. Scanning-tunneling-microscopy studies of Ag on Si(100)-(2 x 1). PHYSICAL REVIEW LETTERS 1989; 63:2830-2833. [PMID: 10041004 DOI: 10.1103/physrevlett.63.2830] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
97
|
Rich DH, Franklin GE, Leibsle FM, Miller T, Chiang T. Synchrotron photoemission studies of the Sb-passivated Si surfaces: Degenerate doping and bulk band dispersions. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:11804-11816. [PMID: 9991787 DOI: 10.1103/physrevb.40.11804] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
98
|
Hasan R, Dockrell HM, Chiang T, Hussain R. Quantitative antibody ELISA for leprosy. INTERNATIONAL JOURNAL OF LEPROSY AND OTHER MYCOBACTERIAL DISEASES : OFFICIAL ORGAN OF THE INTERNATIONAL LEPROSY ASSOCIATION 1989; 57:766-76. [PMID: 2681459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Quantitative enzyme-linked immunosorbent assays (ELISAs) were established to measure IgM and IgG antibody levels to soluble Mycobacterium leprae sonicate (CD60) and to the synthetic disaccharide antigen based on the phenolic glycolipid-I antigen of M. leprae coupled to bovine serum albumin in 46 leprosy patients. Separate reference pools for IgM and IgG antibody were established. The reciprocal of the antibody titer was expressed as the number of arbitrary units in the reference pools which was subsequently used as the calibrator for assessment of units in individual test sera. The dose-response relationship for both IgM and IgG was highly specific and reproducible for both isotypes, as indicated by the intra- and inter-assay coefficients of variation. The distribution of antibody levels are in general agreement with the results from previous studies against different M. leprae antigens. The lepromatous group showed 10- to 100-fold higher IgM antibodies to both the soluble sonicate antigen and the disaccharide as compared to the control group. Very low to undetectable levels of IgM antibodies were observed in the tuberculoid group of leprosy patients. IgG antibodies, on the other hand, were not only present but showed considerable overlap with the lepromatous patient group. Optimized ELISAs, such as the one described in this study, would allow one to address issues such as antibody changes with treatment, antigen clearance, and correlation with other immune parameters associated with disease pathogenesis and protection.
Collapse
|
99
|
Mueller MA, Samsavar A, Miller T, Chiang T. Probing interfacial properties with Bloch electrons: Ag on Cu(111). PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:5845-5848. [PMID: 9992637 DOI: 10.1103/physrevb.40.5845] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
100
|
Wong DT, Gertz R, Chow P, Chang AL, McBride J, Chiang T, Matossian K, Gallagher G, Shklar G. Detection of Ki-ras messenger RNA in normal and chemically transformed hamster oral keratinocytes. Cancer Res 1989; 49:4562-7. [PMID: 2501028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The cheek pouch of the Syrian hamster is an excellent model for the experimental study of oral carcinogenesis. The carcinogenic chemical 7,12-dimethylbenz[a]anthracene consistently produces epidermoid carcinomas in the cheek pouch of the Syrian hamster, giving rise to characteristic histopathological lesions in a time-dependent manner. We now present experimental evidence that c-Ki-ras mRNA can be detected in all 7,12-dimethylbenz[a]anthracene-induced tumors examined (in vivo and in vitro) in this experimental oral cancer model while no detectable c-Ki-ras mRNA can be found in the normal hamster cheek pouch epithelium. Cellular synchronization experiments using a cell line (hamster cheek pouch carcinoma cell line 1) derived from one of these 7,12-dimethylbenz[a]anthracene-induced hamster oral tumors revealed that the c-Ki-ras protooncogene is expressed during the G1 phase of the cell cycle (proliferation dependent). Serum starvation and RNA synthesis inhibition experiments using hamster cheek pouch carcinoma cell line 1 cells suggest that the c-Ki-ras protooncogene is indeed quiescent in the normal hamster cheek pouch epithelium and that failure to detect its mRNA is not related to the slower proliferation of the normal epithelial cells. These results suggest that the transcription of the c-Ki-ras protooncogene is associated with malignant transformation in the cheek pouch of the Syrian hamster.
Collapse
|