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  • 1
    ISSN: 0886-1544
    Keywords: erythroid spectrin ; non-erythroid spectrin ; Z-line ; membrane ; neuromuscular junction ; developmental changes ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: We describe multiple human cardiac and skeletal muscle spectrin isoforms. Cardiac muscle expresses five erythroid α,β spectrin-reactive isoforms with estimated MR's of 280, 274, 270, 255, and 246 kD, respectively At least one nonerythroid α-spectrin of MR 284 kD is expressed in heart. While skeletal muscle shares the 280, 270, and 246 kD erythroid spectrins, it expresses an immunologically distinct 284 kD nonerythroid α-spectrin isoform. The 255 kD erythroid β-spectrin isoform is specific for cardiac tissue. By immunocytochemistry, both erythroid β- and nonerythroid α-spectrins are localized to costameres, the plasma membrane, and the neuromuscular junctional region.
    Additional Material: 7 Ill.
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  • 2
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The mechanism of growth inhibition mediated by tumor necrosis factor (TNF) is unclear. Since recent data strongly suggested that generation of superoxide is a key step in cytotoxicity of TNF, we reasoned that cells expressing high levels of enzymes that degrade superoxide radicals would be resistant to TNF. Therefore, we examined the TNF-sensitivity of bone marrow progenitor cells of transgenic mice that expressed the gene for human copper zinc-superoxide dismutase (CuZn-SOD). The CuZn-SOD is a key enzyme in the metabolism of superoxide radicals. Heterozygous and homozygous transgenic mice had 3- and 5-fold increased levels of CuZn-SOD activity, respectively. Bone marrow cells of transgenic and nontransgenic mice were plated in soft gel culture with TNF (0.01-100 ng/ml). TNF inhibited myeloid colony formation supported by either granulocyte-macrophage colony-stimulating factor (GM-CSF) or G-CSF from nontransgenic mice in a dose-dependent manner. In contrast, the myeloid clonal growth of homozygote transgenic mice was not inhibited by TNF at concentrations up to 100 ng/ml. As expected, the effects of TNF on erythroid clonogenic cells, which do not produce superoxide, and the action of transforming growth factor-β on myeloid progenitor cells, were similar in both transgenic and nontransgenic mice. These results suggest that the mechanism of TNF-mediated growth inhibition of hematopoietic cells occurs through production of superoxide. © 1994 Wiley-Liss, Inc.
    Additional Material: 5 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 50 (1992), S. 78-82 
    ISSN: 0730-2312
    Keywords: adenocarcinoma ; prostate ; prostatectomy ; PSA ; TUR ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: The incidence of stage A (incidental) adenocarcinoma of the prostate in transurethral resection (TUR) specimens is approximately 16%. This paper discusses the criteria for differentiating state A1 versus stage A2 tumor, based on tumor volume and grade. Both the short-term (4 year) and long-term (8-10 year) natural history of untreated stage A1 prostate cancer are examined. Options to follow patients expectantly are presented. These include digital rectal examination and transrectal ultrasound. Specific problems relating to analyzing transrectal ultrasounds in patients who have had a prior TUR are addressed. Also, the unique aspects of transrectal ultrasound for stage A1 disease as it relates to the location of the lesion are expanded upon. The third option in the management of stage A1 disease is to monitor serum prostate specific antigen (PSA) levels. Areas covered include the sensitivity and specificity of PSA in general, and, in specific, serum PSA levels following TUR for stage A1 disease as a predictor of residual tumor. New data on a small group of patients who underwent delayed radical prostatectomy following diagnosis of stage A1 disease, where PSA data was available, are presented. The rationale for following patients with stage A1 disease by monitoring their serum PSA levels is supported by data from a group of men with normally sized prostates, benign prostatic hyperplasia, or cancer where longitudinal serum PSA levels were available. Finally, the option of radical prostatectomy for stage A1 disease is put forth. Data include a study of a large group of radical prostatectomy specimens performed for stage A1 disease. This includes the incidence of substantial tumor in this group and our ability to predict substantial tumor based on information obtained by TUR. In conclusion, a summary of the management of stage A1 disease in older versus younger men is presented. © 1992 Wiley-Liss, Inc.
    Additional Material: 1 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 50 (1992), S. 65-67 
    ISSN: 0730-2312
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Additional Material: 1 Tab.
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  • 5
    Electronic Resource
    Electronic Resource
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 53 (1993), S. 206-212 
    ISSN: 0730-2312
    Keywords: NADPH-cytochrome P-450 oxidoreductase ; rat epidermis ; reconstitution with P-450 1A1 ; immunohisto-chemistry ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: NADPH-cytochrome P-450 oxidoreductase (P-450 red) transfers reducing equivalents from NADPH to cytochrome P-450 (P-450) in the monooxygenase system. Detergent solubilized proteins from the membrane fraction of neonatal rat epidermis were purified by 2′,5′-ADP-agarose affinity column chromatography. The purified protein showed an apparent homogeneity on sodium dodecylsulfate-polyacrylamide gel electrophoresis and molecular weight was estimated to be 78 kDa. NADPH-cytochrome c reductase activity increased by 95-fold in the purified enzyme. Epidermal P-450 red in vitro reconstituted benzo(a)pyrene hydroxylase activity in a dose dependent manner with P-450 purified from either rat liver or epidermis. Western blot analysis demonstrated that epidermal P-450 red immunologically cross reacts to liver P-450 red. Immunohistochemical staining showed that the enzyme was predominantly localized in the epidermis. The intensity of immunohistochemical staining of rat skin sections and tissue distribution did not change in the skin treated with β-naphtoflavone, which results in a substantial increase in P-450 1A1 activity. Quantitative assessment of P-450 red in treated and untreated epidermis also showed no change. These findings indicate that constitutive P-450 red, fully capable of supporting P-450, exists in rat epidermis, and can function in metabolism of endogenous and exogenous compounds.
    Additional Material: 4 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 49 (1992), S. 296-303 
    ISSN: 0730-2312
    Keywords: prolyl endopeptidase ; granulomatous tissue reaction ; angiotensin system ; hydrolysis of angiotensin I and II ; purification and characterization ; immunohistochemistry ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Activity of prolyl endopeptidase (EC 3.4.21.26) which hydrolyses the Pro7-Phe8 bond in angiotensin II has been found to elevate in experimentally produced granulomatous inflammation in liver and skin. We purified the enzyme 1,536-fold by 6 steps from murine hepatic granulomas. The purified enzyme has a molecular weight of 79 kDa and physiocochemical properties equivalent to those previously reported for prolyl endopeptidase purified from other sources. By HPLC analysis, the cleavage of Phe8-Leu10 and Phe8 from angiotensin I and II, respectively, was detected and quantified. Monospecific IgG was prepared from serum of rabbits injected with purified enzyme. Concentration of the enzyme was immunohistochemically detected in cells which form granulomatous organization, but not in inflammatory cells surrounding the foci. The antibody, however, cross reacted with the enzyme in adjacent liver cells and weakly stained their cytoplasm. The findings indicate that this enzyme, in addition to angiotensin converting enzyme, may serve as a useful biochemical marker for granulomatous tissue reactions.
    Additional Material: 4 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    BioEssays 14 (1992), S. 411-413 
    ISSN: 0265-9247
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    BioEssays 12 (1990), S. 447-448 
    ISSN: 0265-9247
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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