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Fatty acids resources:

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J Immunol. 2000 Nov 15;165(10):5392-6.
Cutting edge: TLR2-deficient and MyD88-deficient mice are highly susceptible to Staphylococcus aureus infection.

Takeuchi O, Hoshino K, Akira S.

Department of Host Defense, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan. Core Research for Evolutional Science and Technology of Japan Science and Technology Corporation, Osaka, Japan.

Toll-like receptor (TLR) family acts as pattern recognition receptors for pathogen-specific molecular patterns. We previously showed that TLR2 recognizes Gram-positive bacterial components whereas TLR4 recognizes LPS, a component of Gram-negative bacteria. MyD88 is shown to be an adaptor molecule essential for TLR family signaling. To investigate the role of TLR family in host defense against Gram-positive bacteria, we infected TLR2- and MyD88-deficient mice with Staphylococcus aureus. Both TLR2- and MyD88-deficient mice were highly susceptible to S. aureus infection, with more enhanced susceptibility in MyD88-deficient mice. Peritoneal macrophages from MyD88-deficient mice did not produce any detectable levels of cytokines in response to S. aureus. In contrast, TLR2-deficient macrophages produced reduced, but significant, levels of the cytokines, and TLR4-deficient macrophages produced the same amounts as wild-type cells, indicating that S. aureus is recognized not only by TLR2, but also by other TLR family members except for TLR4.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11067888&dopt=Abstract

Can J Microbiol. 2000 Oct;46(10):961-6.
The binding of Proteus mirabilis nonagglutinating fimbriae to ganglio-series asialoglycolipids and lactosyl ceramide.

Lee KK, Harrison BA, Latta R, Altman E.

Institute for Biological Sciences, National Research Council of Canada, Ottawa, ON, Canada.

Proteus mirabilis is a common opportunistic Gram-negative uropathogen that infects the upper urinary tract. We have examined the role of the nonagglutinating fimbriae (NAF) of P. mirabilis in mediating bacterial adhesion to cell surface receptors. Purified NAF of P. mirabilis were demonstrated to bind to a number of glycolipids, including asialo-GM1, asialo-GM2, and lactosyl ceramide (LacCer) in solid-phase binding assays and in thin layer chromatography (TLC) overlay assays. Furthermore, preincubation of the biotinylated NAF (Bt-NAF) with anti-NAF monoclonal antibodies resulted in inhibition of NAF binding to immobilized asialo-GM1, asialo-GM2, and LacCer. In adherence assays, P. mirabilis binding to Madin-Darby canine kidney (MDCK) cells was inhibited by murine anti-asialo-GM1 monoclonal antibodies H2G10 to about 50% of the binding level in the absence of the antibody, specific for the terminal beta-galactopyranosyl residue of asialo-GM1 (Harrison et al. 1998). The results of this study suggest that NAF of P. mirabilis recognize a GalNAc beta 1-4Gal moiety present in the ganglio-series of asialoglycolipids, and that the terminal beta-galactopyranosyl-containing glycoconjugates play a role in NAF-mediated adherence of P. mirabilis to MDCK cells. Similarly to other bacteria, P. mirabilis NAF was also shown to express the LacCer specificity.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11068685&dopt=Abstract

Anticancer Res. 2000 Sep-Oct;20(5A):2967-74.
Mutation analysis of the cationic trypsinogen gene in patients with pancreatic cancer.

Hengstler JG, Bauer A, Wolf HK, Bulitta CJ, Tanner B, Oesch F, Gebhard S, Boettger T.

Institute of Toxicology, University of Mainz, Germany. hengstlail-Uni-Mainz.de

Recently, an Arg to His mutation at residue 117 of the cationic trypsinogen gene (Arg117His) has been shown to be associated with hereditary pancreatitis (hp). A serious complication of hp is development of pancreatic cancer. Patients suffering from hp have been reported to have a 53-fold increased risk to die from pancreatic cancer. However, the quantitative contribution of mutations in the cationic trypsinogen gene to all pancreatic cancer cases is unknown. A relevant contribution of the Arg117His-mutation to pathogenesis of pancreatic cancer might be possible, since also asymptomatic individuals have been reported to carry this mutation and individuals with only mild symptoms may be undiagnosed as hp. In the present study we analyzed genomic DNA obtained from pancreatic cancer tissue from 34 patients and corresponding normal tissue from 28 of these individuals. The third exon of the cationic trypsinogen gene was amplified by nested PCR and digested with AflIII, since the Arg117His mutation creates an AflIII-restriction site. None of the examined samples carried the Arg117His mutation, whereas the amplification product obtained from a patient with known hp was clearly positive. Sequencing of the complete third exon of the cationic trypsinogen gene in 10 of the pancreatic cancer patients resulted exclusively in the wild-type sequence. In addition DNA obtained from venous blood of 116 further patients with pancreatic cancer did not carry the Arg117His mutation. Our results show that the Arg117His mutation does not contribute to pathogenesis of a substantial fraction of all pancreatic adenocarcinomas. In contrast to most oncogenes or tumor suppressor genes the cationic trypsinogen gene (3rd exon) does not contain mutational hot spots.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11062709&dopt=Abstract

Virology. 2000 Nov 10;277(1):127-35.
The human T-cell leukemia virus type I (HTLV-I) X region encoded protein p13(II) interacts with cellular proteins.

Hou X, Foley S, Cueto M, Robinson MA.

Laboratory of Immunogenetics, Twinbrook II Facility, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 12441 Parklawn Drive, Rockville, Maryland, 20852, USA.

Interactions between the Human T-cell leukemia virus type I (HTLV-I) gene product p13(II) and cellular proteins were investigated using the yeast two-hybrid system. Variant forms of p13(II) were derived from two HTLV-I molecular clones, K30p and K34p, that differ in both virus production and in vivo and in vitro infectivity. Two nucleotide differences between the p13 from K30p (p13K30) and K34p (p13K34) result in a Trp-Arg substitution at amino acid 17 and the truncation of the 25 carboxyl-terminal residues of p13K34. A cDNA library from an HTLV-I-infected rabbit T-cell line was screened with p13K30 and p13K34 as bait. Products of two cDNA clones, C44 and C254, interacted with p13K34 but not with p13K30. Interactions were further confirmed using the GST-fusion protein coprecipitation assay. Sequence analysis of C44 and C254 cDNA clones revealed similarities to members of the nucleoside monophosphate kinase superfamily and actin-binding protein 280, respectively. Further analysis of the function of these two proteins and the consequence of their interaction with p13 may help elucidate a role for p13 in virus production, infectivity, or the pathogenesis of HTLV-I. 2000 Academic Press.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11062043&dopt=Abstract

Plant J. 2000 Oct;24(2):205-18.
Three unique mutants of Arabidopsis identify eds loci required for limiting growth of a biotrophic fungal pathogen.

Dewdney J, Reuber TL, Wildermuth MC, Devoto A, Cui J, Stutius LM, Drummond EP, Ausubel FM.

Department of Molecular Biology, Wellman 10, Massachusetts General Hospital, Boston, MA 02114, USA.

To identify components of the defense response that limit growth of a biotrophic fungal pathogen, we isolated Arabidopsis mutants with enhanced disease susceptibility to Erysiphe orontii. Our initial characterization focused on three mutants, eds14, eds15, and eds16. None of these is considerably more susceptible to a virulent strain of the bacterial pathogen Pseudomonas syringae pv. maculicola (Psm). All three mutants develop a hypersensitive response when infiltrated with Psm expressing the avirulence gene avrRpt2, which activates resistance via the LZ-NBS/LRR resistance protein encoded by RPS2. The growth of Psm(avrRpt2), while somewhat greater in the mutants than in the wild type, is less than growth of the isogenic virulent strain. These results indicate that resistance mediated via LZ-NBS/LRR R genes is functional. Analysis of the growth of avirulent Peronospora parasitica strains showed that the resistance pathway utilized by TIR-NBS/LRR R genes is also operative in all three mutants. Surprisingly, only eds14 and eds16 were more susceptible to Erysiphe cichoracearum. Analysis of the expression profiles of PR-1, BGL2, PR-5 and PDF1.2 in eds14, eds15, and eds16 revealed differences from the wild type for all the lines. In contrast, these mutants were not significantly different from wild type in the deposition of callose at sites of E. orontii penetration. All three mutants have reduced levels of salicylic acid after infection. eds16 was mapped to the lower arm of chromosome I and found by complementation tests to be allelic to the salicylic acid-deficient mutant sid2.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11069695&dopt=Abstract

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