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Medicina (B Aires). 2000;60(3):348-50.
[Prevalence of Flavivirus antibodies in Alouatta caraya primate autochthonous of Argentina]

[Article in Spanish]

Contigiani MS, Fernandez C, Spinsanti LI, Diaz GE.

Laboratorio de Arbovirus y Arenavirus, Instituto de Virologia Dr. J. M. Vanella, Facultad de Ciencias Medicas, Universidad Nacional de Cordoba. contigimefcm.uncor.edu

Flavivirus constitute a human health problem in our country. Primates are known to participate in the maintenance of Dengue and Yellow Fever viruses. However, these animals play a role which still remains to be determined in the maintenance of other viruses with potential pathogenicity for human beings and/or animals. Deteccion of antibodies was performed for different flavivirus in 105 sera samples of Alouatta caraya primates by the hemagglutination inhibition (HI) test. The neutralization (NT) test confirmed only infections caused by St. Louis Encephalitis (SLE) virus with a high prevalence in HI (35.23%) and NT (32.38%) antibodies. No antibody titres indicative of infections by Yellow Fever, Dengue and Bussuquara viruses were registered. Infection by the liheus virus could not be confirmed in these primates. There is a need for studies to detect new or reemergent viral infections in Argentina and the role that these primates could play in the maintenance of such infections.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11050814&dopt=Abstract

Z Orthop Ihre Grenzgeb. 1999 Jul-Aug;137(4):355-61.
[Examination of Heberden arthrosis with a histological-histochemical score]

[Article in German]

Irlenbusch U, Dominick G.

Orthopadische Klinik des Marienstifts Arnstadt.

QUESTIONS: In case of Heberden's nodes the osteoarthritis starts with a so called tidemark flaking as a reaction to a subchondral ossification. The question was, if a differentiation in relation to a control group by an objective score is possible. METHODS: 218 finger joints from 56 cadavers were investigated morphologically (score). RESULTS: The osteoarthritis starts with a subchondral ossification. At this time the surface of the cartilage is not destroyed yet. Reactive tidemark flaking is the beginning of the general degradation. In relation to a control group a significant differentiation by a histological score is possible. CONCLUSIONS: In case of Heberden's nodes the osteoarthritis starts with the subchondral ossification. Because Heberden's nodes are the specific manifestation of the Generalized Osteoarthritis on the distal finger joints, further studies have to assess, if the same pathogenetic mechanism can be seen in osteoarthritis of the large joints.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11051023&dopt=Abstract

Membr Cell Biol. 2000;14(1):97-107.
Reduction of Ca2+-transporting systems in memory T cells.

Sigova AA, Dedkova EN, Zinchenko VP, Litvinov IS.

Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region.

Antigen-specific B and T lymphocytes make up the material grounds of immune memory, their main functional distinction from the so-called "naive" cells is due to the rapid and enhanced response to the antigen-pathogen. An essential distinction between the memory and naive T cells is different sensitivity of these two subpopulations of T lymphocytes to Ca2+-ionophores. Comparative analysis of Ca2+ responses of the immune memory T lymphocytes and naive T cells of mouse CBA/J line to the addition of Ca2+-mobilizing agents concanavalin A, thapsigargin, and ionomycin was carried out. These compounds in concentrations increasing [Ca2+]i in naive cells had no effect on [Ca2+]i in memory cells. Thus, the Ca2+ entrance into memory cells was not activated by exhaustion of intracellular resources. Estimation of intracellular resources of Ca2+, mobilized by ionomycin and thapsigargin in Ca2+ free medium has shown the absence in memory T cells of the intracellular Ca2+ pool, which may be one of factors of their resistance to ionophores. Reduction of the system of Ca2+ influx into memory T cells was shown using the SH-reagent thimerosal. Memory T cells appear to be resistant to "Ca2+ -paradox." Their incubation with 0.5 mM EDTA in the presence or absence of Ca2+ -mobilizing compounds followed by addition of 2 mM CaCl2 did not result in induction of Ca2+ influx into these cells.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11051086&dopt=Abstract

Arch Biochem Biophys. 2000 Oct 1;382(1):31-8.
Affinity purification and characterization of a cutinase from the fungal plant pathogen Monilinia fructicola (Wint.) honey.

Wang GY, Michailides TJ, Hammock BD, Lee YM, Bostock RM.

Department of Plant Pathology, University of California, Davis 95616, USA.

Trifluoromethyl ketones (TFK) are potent inhibitors of a variety of serine hydrolases. The TFK inhibitor, 3-(4-mercaptobutylthio)-1,1,1-trifluoro-2-propanone (MBTFP), was found to competitively inhibit cutinase activity (I50 = 9.4 x 10(-3)) from the fungal plant pathogen Monilinia fructicola and to serve as an effective affinity ligand for the purification of cutinases from culture filtrates. The TFK inhibitors, 3-n-octylthio-1,1,1-trifluoro-2-propanone (OTFP) and 3-n-pentylthio-1,1,1-trifluoro-2-propanone (PTFP), also inhibited cutinase activity with I50 values of 1.6 x 10(-6) and 2.3 x 10(-4) M, respectively. Buffer containing OTFP was the strongest eluant for cutinases of M. fructicola and provided the best purification factor and yield, although buffers containing OTFP, detergent, and salt were found to be effective for eluting cutinases bound to MBTFP-Sepharose. Buffer containing 0.5% Triton X-100 also selectively eluted cutinases from the affinity column. Two-dimensional electrophoretic analysis by SDS-PAGE and isoelectric focusing of the affinity-purified cutinase fraction indicated activity associated with proteins of pI 8.2 and molecular masses of approximately 18.6 and 20.8 kDa. These proteins hydrolyzed [3H]cutin and artificial substrates such as p-nitrophenylbutyrate and related esters, typical of other cutinases, but differ from previously characterized cutinases in molecular mass. The two low-molecular-weight proteins resolved by 2-D gel electrophoresis were subjected to in-gel digestion with Lys-C and the resulting peptide fragments were separated by Microbore-HPLC. The amino acid sequences of several internal peptide fragments had high homology with cutinase sequences from other fungi, particularly the plant pathogen Botrytis cinerea. Our study illustrates the potential of TFK ligands for the affinity purification of cutinases and indicates that the cutinases from M. fructicola have novel features warranting further study.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11051094&dopt=Abstract

J Clin Immunol. 2000 Sep;20(5):347-53.
Expression of perforin and Fas ligand mRNA in the liver of viral hepatitis.

Tagashira M, Yamamoto K, Fujio K, Nagano T, Okamoto R, Ibuki N, Yabushita K, Matsumura S, Okano N, Tsuji T.

First Department of Internal Medicine, Okayama University Medical School, Japan.

Cytotoxic T lymphocytes (CTLs) play an important role in the pathogenesis of viral hepatitis. We studied the expression of mRNAs of perforin and Fas ligand (Fas-L) in biopsy specimens from chronic hepatitis B (CHB) (15 cases) and hepatitis C (CHC) patients (13 cases). Both perforin and Fas-L mRNAs were detected in all cases of both CHB and CHC. No messages were detected in the control livers from two cases of fatty liver, a case of Gilbert's syndrome, and a case of Dubin-Johnson syndrome. Semiquantitative analysis revealed a positive correlation between the intensity of perforin and Fas-L mRNAs in both CHB and CHC. In CHB, the intensity of both perforin and Fas-L mRNAs showed a positive correlation with the histological activity and serum alanine aminotransferase level, while the correlation was not apparent in CHC. These results suggest that both perforin and Fas/Fas-L systems are involved in the pathogenesis of liver cell injury of CHB and CHC.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11051276&dopt=Abstract

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