1726
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Abstract
The expression of two intestinal mucin-associated antigens large intestine mucin antigen (LIMA) and small intestine mucin antigen (SIMA) were investigated by indirect immunoperoxidase staining of rectal mucosa from patients suffering from ulcerative colitis with (n = 6) and without (n = 31) associated carcinoma and in noncolitic controls (n = 40). The aim was to assess the relationship between antigen patterns and malignant change. SIMA, which is localised predominantly in the small intestine, is virtually undetectable in the normal adult colonic mucosa. However, this antigen is present in the foetal colon and colonic carcinoma. LIMA is expressed in normal colonic mucosa, but absent from the small intestine. LIMA staining patterns were not significantly different among the three groups. In contrast, expression of SIMA was significantly higher in the patients who had developed carcinoma (6/6) than in the noncancer group (7/71) (P less than 0.001). The presence of SIMA was also significantly related to areas of dysplasia compared to normal (P = .03) or inflammation (P less than .05), but it did not differ from mucosa showing "indefinite" atypia. The finding of 31% SIMA-positive biopsies associated with severe inflammation in colitis with active disease, but no evidence of malignancy, is difficult to explain at the present stage. A followup study would be necessary to determine its significance. Perhaps the most important finding is the increased frequency of SIMA-positive foci in histologically normal mucosa in carcinoma patients compared with the noncancer group (P less than .001), suggesting a field change. These observations may be prove useful for the identification of patients who may be at risk of developing carcinoma.
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1727
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Ruden DM, Ma J, Ptashne M. No strict alignment is required between a transcriptional activator binding site and the "TATA box" of a yeast gene. Proc Natl Acad Sci U S A 1988; 85:4262-6. [PMID: 3132708 PMCID: PMC280407 DOI: 10.1073/pnas.85.12.4262] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
GAL4 is a transcriptional activator of the galactose metabolism genes in the yeast Saccharomyces cerevisiae. We show that GAL4 expressed in yeast activated transcription equally well when a single GAL4 binding site was placed at any of nine positions upstream of the GAL1 (galactokinase gene) "TATA box." We chose a sufficient number of positions for the binding site to ensure that, in several of these positions, GAL4 was on the opposite side of the DNA helix with respect to the TATA box. Smaller GAL4 derivatives were similar to wild-type GAL4 in that they also activated transcription in a manner independent of the side of the DNA helix they bound with respect to the TATA box. Unlike wild-type GAL4, however, these smaller GAL4 derivatives activated transcription better when we placed a binding site progressively closer to the TATA box over a distance of 34 base pairs.
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1728
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Abstract
The single channel conductance of the dihydropyridine (DHP)-sensitive calcium channel from rabbit skeletal muscle transverse tubules was analyzed in detail using the planar bilayer recording technique. With 0.1 M BaCl2 on both sides of the channel (symmetrical solutions), the most frequent conductance is 12 pS, which is independent of holding potential in the range of -80 to +80 mV. This conductance accounts for approximately 80% of all openings analyzed close to 0 mV. Two additional channels of conductance 9 and 3 pS are also present at all positive potentials, but their relative occurrence close to 0 mV is low. All channels depend on the presence of agonist Bay K 8644 and are inhibited by the antagonist nitrendipine. The relative occurrence of 9 and 3 pS can be increased, and that of 12 pS decreased, by several interventions such as external addition of cholesterol, lectin (wheat germ agglutinin), or calmodulin inhibitor R24571 (calmidazolium). The 9- and 3-pS channels are also conspicuous at positive potentials larger than +40 mV. We suggest that 9- and 3-pS channels are two elementary conductances of the same DHP-sensitive Ca channel. Under most circumstances, these two conductances are gated in a coupled way to generate a channel with a unitary conductance of 12 pS. Interventions tested, including large depolarizations, probably decompose or uncouple the 12-pS channel into 9 and 3 pS.
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1729
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Scanlon KJ, Lu Y, Kashani-Sabet M, Ma J, Newman E. Mechanisms for cisplatin-FUra synergism and cisplatin resistance in human ovarian carcinoma cells both in vitro and in vivo. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1988; 244:127-35. [PMID: 3247881 DOI: 10.1007/978-1-4684-5607-3_12] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Cisplatin and FUra act synergisticly in human carcinomas. An increase in the availability of reduced folates necessary for tight binding of FdUMP to thymidylate synthase (TS) contributes to the enhanced cytotoxicity of this drug combination. The human ovarian A2780 cell line made three-fold resistant to cisplatin has been shown to have a three-fold elevation of m-RNA for dihydrofolate reductase (DHFR) and TS. However, this increase did not result from an amplification of the genes for these two enzymes. In contrast, ovarian carcinoma cells from patients who failed treatment with cisplatin and FUra have been shown to have both enhanced gene expression and increased gene copy number for DHFR and TS.
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1730
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Filipe MI, Barbatis C, Sandey A, Ma J. Expression of intestinal mucin antigens in the gastric epithelium and its relationship with malignancy. Hum Pathol 1988; 19:19-26. [PMID: 3275579 DOI: 10.1016/s0046-8177(88)80311-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The expression of large and small intestinal mucin antigens (LIMA and SIMA) was investigated in 30 gastrectomy specimens of carcinoma and in 11 controls resected for various pathologic conditions. One hundred eighty-five samples of normal mucosa, hyperplasia, intestinal metaplasia (types I, II, and III), dysplasia, and tumor were studied to identify phenotypes indicative of premalignant change. Our results showed LIMA and SIMA were not detected in normal gastric epithelium from either control or carcinoma specimens. SIMA characterized goblet cell mucin in all types of intestinal metaplasia and was not discriminatory between controls and carcinoma groups. On the other hand, LIMA was extensively expressed in columnar and goblet cells in carcinoma-bearing stomachs (97 per cent) but was absent in controls. There was a crescendo intensity and frequency of LIMA staining in an inverse relation to the degree of cell maturation and differentiation from type I intestinal metaplasia (60 per cent) to type II (85 per cent), type III (100 per cent), and dysplasia (100 per cent). In contrast, intestinal metaplasia of any type in controls did not show LIMA. The distribution of LIMA seemed to be intimately related to cell differentiation in the proliferative zone at the base of metaplastic glands. Carcinomas revealed antigenic phenotype heterogenicity. Our data indicate that LIMA sharpens the diagnosis of dysplasia, discriminates between reactive and preneoplastic epithelium (particularly within intestinal metaplasia), and detects abnormal phenotypes that may represent early stages in carcinogenesis.
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1731
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Abstract
We describe yeast transcriptional activators encoded by E. coli genomic DNA fragments fused to the coding sequence of the DNA-binding portion of GAL4. All of the new activating sequences that we have analyzed, like those of GAL4 and GCN4, are acidic; most of these sequences show no obvious sequence homology when compared with the identified activating regions of GAL4 and GCN4 or among themselves. We also describe a fusion protein that contains no yeast protein sequence but activates transcription in yeast.
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1732
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Abstract
In wild-type yeast the action of the transcriptional activator GAL4 is inhibited by GAL80, and galactose relieves this inhibition. We show that deletion mutants of GAL4 lacking 30 amino acids of the carboxyl terminus activate transcription constitutively, whereas other deletion mutants bearing the carboxy-terminal 30 amino acids are inhibited by GAL80. Moreover, GAL4 fragments bearing these 30 amino acids, when expressed from a strong promoter on multicopy plasmids, free the endogenous GAL4 from inhibition by GAL80. These and other results suggest that GAL80 recognizes the carboxy-terminal 30 amino acids of GAL4, forming a complex that, though bound to DNA, does not activate transcription.
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1733
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Abstract
We describe the activities of a wide array of deletion mutants of GAL4, a yeast transcriptional activator. We identify two short regions of GAL4, each of which activates transcription when fused to the DNA-binding region of the molecule. Very large portions of GAL4 are not required for gene activation.
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1734
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Ecke RE, Ma J, Migone AD, Sullivan TS. Effects of substrate heterogeneity on adsorption isotherms near a two-dimensional gas-liquid critical point. PHYSICAL REVIEW. B, CONDENSED MATTER 1986; 33:1746-1751. [PMID: 9938481 DOI: 10.1103/physrevb.33.1746] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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1735
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Ma J. [Seroepidemiological study of viral hepatitis among hospital staffs]. ZHONGHUA LIU XING BING XUE ZA ZHI = ZHONGHUA LIUXINGBINGXUE ZAZHI 1985; 6:321-5. [PMID: 3833374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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1736
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Ma J. [Preliminary research in to the ancient medical documents as presented in the Ishinho] (Jpn). NIHON ISHIGAKU ZASSHI. [JOURNAL OF JAPANESE HISTORY OF MEDICINE] 1985; 31:326-71. [PMID: 11622120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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1737
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Abstract
A patient with an abdominal mass for 4 years developed hypereosinophilia and weight loss. Bone marrow aspirations and biopsy specimens showed hypercellularity of eosinophils. No cause for hypereosinophilia was found. Biopsy specimens of several organs, including the abdominal mass, showed eosinophilic infiltration with reactive fibrosis in some. Cytogenetic studies of the bone marrow before treatment with cytoxic drugs showed chromosomal abnormalities. Several of these have been reported in association with acute or eosinophilic leukemias. Based upon these findings, the authors believe that the patient had eosinophilic leukemia and that the abdominal mass probably was an eosinophilic chloroma.
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1738
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Whitehead RH, Macrae FA, St John DJ, Ma J. A colon cancer cell line (LIM1215) derived from a patient with inherited nonpolyposis colorectal cancer. J Natl Cancer Inst 1985; 74:759-65. [PMID: 3857372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
A new human colon cancer cell line (LIM1215) has been derived from a tumor arising in a member of a family known to have a high incidence of colorectal cancer. The tumor cell line is comprised of small pleomorphic cells that clone in liquid medium and form tumors in immunosuppressed mice. Ultrastructurally, the cells are capable of differentiation, with cells with multiple microvilli and cells resembling goblet cells being present in the one culture. The cells are pseudodiploid and contain a 13p+ marker chromosome.
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1739
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Ma J. [Investigation on the arsenic content of sea-foods of Zhoushan Region]. ZHONGHUA YU FANG YI XUE ZA ZHI [CHINESE JOURNAL OF PREVENTIVE MEDICINE] 1985; 19:72-4. [PMID: 4006617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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1740
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Fulton RE, Ma J, Larke RP, Clayton AJ, Currie JF. Virus surveillance in a semi-isolated Arctic military community. Mil Med 1984; 149:639-49. [PMID: 6440052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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1741
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Ma J. [Epidemiological survey of viral hepatitis among a hospital staff]. ZHONGHUA LIU XING BING XUE ZA ZHI = ZHONGHUA LIUXINGBINGXUE ZAZHI 1984; 5:321-4. [PMID: 6241844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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1742
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Fulton RE, Larke RPB, Ma J, Clayton AJ, Currie JF. Virus Surveillance in a Semi-Isolated Arctic Military Community. Mil Med 1984. [DOI: 10.1093/milmed/149.12.639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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1743
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Ma J. [Chromosomal analysis of erythroid progenitor cell colonies (BFU-E) in chronic myelocytic leukemia]. ZHONGHUA NEI KE ZA ZHI 1984; 23:626-8. [PMID: 6598142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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1744
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Ma J. [Determination of inorganic arsenic in sea food]. ZHONGHUA YU FANG YI XUE ZA ZHI [CHINESE JOURNAL OF PREVENTIVE MEDICINE] 1984; 18:178-9. [PMID: 6543172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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1745
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Ma J. [Immune response of patients with carcinoma of uterine cervix treated by radiotherapy and a preliminary report on immunotherapy]. ZHONGHUA ZHONG LIU ZA ZHI [CHINESE JOURNAL OF ONCOLOGY] 1984; 6:120-3. [PMID: 6468252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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1746
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Van Dyke K, Castranova V, Van Dyke CJ, Ma J, Michaux K, Mollison KW, Carter GW. Granulocyte response to oxidized FMLP. Evidence for partial inactivation of FMLP. Inflammation 1984; 8:87-99. [PMID: 6325346 DOI: 10.1007/bf00918356] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
We prepared FMoxLP by oxidation of FMLP and evaluated its ability to trigger a variety of granulocyte responses. FMoxLP was found to depolarize granulocyte membranes; increase granulocyte oxygen consumption, superoxide production, and hydrogen peroxide production; compete with FMLP for binding to granulocytes; and stimulate granulocyte chemotaxis. Against all of these granulocyte functions, FMoxLP was considerably less potent than the parent FMLP. When luminol-dependent-granulocyte chemiluminescence (CL) was studied, FMoxLP was observed to be a more potent stimulus of this response than FMLP. This increased CL activity of FMoxLP may be related to nonoxidative burst mechanisms. Our results indicate that FMoxLP retains a significant amount of the biological activity of FMLP (albeit in general less potent). The biological importance of the observed activities of FMoxLP must await further investigation.
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1747
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Ma J. [Chromosomal observations on myeloid progenitor cells in chronic myelocytic leukemia]. ZHONGHUA NEI KE ZA ZHI 1984; 23:70-1. [PMID: 6590282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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1748
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Ma J, Handley CJ, de Boer WG. An ovarian tumour specific mucin antigen--immunohistological and biochemical studies. Pathology 1983; 15:385-91. [PMID: 6371680 DOI: 10.3109/00313028309085164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
A new mucin antigen was detected in a mucinous cystadenoma of human ovary. An antiserum produced in rabbits against the crude cyst fluid, following appropriate absorptions, showed immunoreactivity exclusively with tumour epithelium, particularly endocervical type epithelium. The antigen responsible for the immunoreactivity was isolated in the fraction with density 1.45g/ml following density gradient ultracentrifugation in cesium chloride, which indicated that it was indeed a glycoprotein. The native glycoprotein was very large since it was excluded from Sepharose CL-2B. The complex could be dissociated following reduction with dithiothreitol. The subunits were included in Sepharose CL-2B and the position of elution would indicate a molecular weight in the order of 1-5 x 10(6). This suggests the native antigen was a complex made up of subunits held together by disulphide bonds. Amino acid analysis of the new antigen showed a resemblance with intestinal mucins, as two-thirds of the protein consists of threonine, serine, proline, alanine and glycine. This similarity in peptide core may explain the potential of the epithelium in ovarian mucinous cystadenoma to produce inappropriate intestinal mucins during the process of malignant transformation.
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1749
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Nayman J, De Boer WG, Ma J. Inappropriate mucin production in endodermal carcinoma--one point of view. THE JAPANESE JOURNAL OF SURGERY 1983; 13:317-23. [PMID: 6316004 DOI: 10.1007/bf02469513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The mucosal lining cells in the gastrointestinal tract respond to a threatening situation by secreting mucins manufactured during foetal life and this secretion is considered to be an early manifestation of cytogenetic instability and which may be the first step in the process of malignant transformation. Using immunohistological techniques and specific antisera against SIMA (small intestinal mucin antigen), LIMA (large intestinal mucin antigen) and CEA (carcinoembryonic antigen) the presence of these mucin antigens was studied in resected specimens from colonic, gastric and gall bladder carcinomas as well as in mucinous tumours of the ovary. Inappropriate or oncofoetal mucins were present in the majority of endodermal carcinomas, in associated metaplastic epithelium and premalignant lesions such as polyps. These antigens were also demonstrated in normal histological epithelium at some distance from the tumour. These findings lead to a better understanding of the biological behaviour of preneoplastic lesions of endodermal tissues and will aid in developing sensitive diagnostic tests for the presence of these substances.
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1750
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Jones SL, Quinn D, Ma J, Ward HA, Pihl E, Nairn RC. Persistence of organ- and iso-antigens in vitro in a long-term culture cell line of colonic carcinoma. Pathology 1982; 14:405-8. [PMID: 6760088 DOI: 10.3109/00313028209092119] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Cells of colonic carcinoma line HT-29, cultured over more than 170 generations and extensively used in immunological studies of patients with colorectal tumours, still express several immunologically valuable characteristics presumably present since its inception. The cell line can induce a poorly differentiated adenocarcinoma in the nude mouse, it has human antigenic characteristics, it expresses blood group A antigen, and produces a colon-specific mucin and CEA, though not colon cancer-specific mucin (CCM). It remains useful as a target for in vitro testing of anti-tumour immunoreactivity in colorectal cancer patients.
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