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Fatty acids resources:

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J Biol Chem. 2001 Jan 26;276(4):2466-73. Epub 2000 Oct 23.
Identification of residues in the Staphylococcus aureus fibrinogen-binding MSCRAMM clumping factor A (ClfA) that are important for ligand binding.

Hartford OM, Wann ER, Hook M, Foster TJ.

Department of Microbiology, Moyne Institute of Preventive Medicine, Trinity College, Dublin 2, Ireland.

Clumping factor A (ClfA) is a cell surface-associated protein of Staphylococcus aureus that promotes binding of this pathogen to both soluble and immobilized fibrinogen (Fg). Previous studies have localized the Fg-binding activity of ClfA to residues 221-559 within the A region of this protein. In addition, the C-terminal part of the A region (residues 484-550) has been implicated as being important for Fg binding. In this study, we further investigate the involvement of this part of ClfA in the interaction of this protein with Fg. Polyclonal antibodies generated against a recombinant protein encompassing residues 500-559 of the A region inhibited the interaction of both S. aureus and recombinant ClfA with immobilized Fg in a dose-dependent manner. Using site-directed mutagenesis, two adjacent residues, Glu(526) and Val(527), were identified as being important for the activity of ClfA. S. aureus expressing ClfA containing either the E526A or V527S substitution exhibited a reduced ability to bind to soluble Fg and to adhere to immobilized Fg. Furthermore, bacteria expressing ClfA containing both substitutions were almost completely defective in Fg binding. The E526A and V527S substitutions were also introduced into recombinant ClfA (rClfA-(221-559)) expressed in Escherichia coli. The single mutant rClfA-(221-559) proteins showed a significant reduction in affinity for both immobilized Fg and a synthetic fluorescein-labeled C-terminal gamma-chain peptide compared with the wild-type protein, whereas the double mutant rClfA-(221-559) protein was almost completely defective in binding to either species. Substitution of Glu(526) and/or Val(527) did not appear to alter the secondary structure of rClfA-(221-559) as determined by far-UV circular dichroism spectroscopy. These data suggest that the C terminus of the A region may contain at least part of the Fg-binding site of ClfA and that Glu(526) and Val(527) may be involved in ligand recognition.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11044451&dopt=Abstract



Pediatr Res. 2000 Nov;48(5):685-90.
Structural and functional features of modified heat-stable toxins produced by enteropathogenic Klebsiella cells.

Albano F, Thompson MR, Orru S, Scaloni A, Musetta A, Pucci P, Guarino A.

Department of Pediatrics, University Federico II, Naples, Italy.

Heat-stable enterotoxins (STs) are 18- or 19-amino acid peptides (STa or ST1) produced by enteropathogenic bacteria with small differences in their amino acid sequence and a highly conserved carboxy terminus. All STs contain a core of three disulfide bridges whose integrity is believed to be necessary for full biologic activity. We previously reported that strains of Klebsiella pneumoniae transformed by the plasmid pSLM004 produce a modified toxin not recognized by MAb raised against genuine Escherichia coli ST. Investigation of the chemical structure of the modified toxins revealed that three new toxins were present. These were purified to homogeneity by a series of sequential chromatography on reverse-phase columns using guanylate cyclase to monitor the enterotoxic activity during purification procedures. The sequence of the modified toxins was obtained by a combination of Edman degradation and mass spectrometry, showing that they are proteolytically processed forms of E. coli ST1b. In particular, toxin A-2 lacks the cysteine at position 18 and then is not able to form the disulfide bridge cysteine-10-cysteine-18. All three toxins showed the ability to stimulate guanylate cyclase and to elicit chloride secretion in Caco-2 cell monolayers mounted in Ussing chambers. Toxin A-1 and toxin B demonstrated greatly reduced immunoreactivity whereas toxin A-2 was not recognized at all in the ELISA. It is likely that the three modified toxins were generated by Klebsiella specific proteolytic processing of the original pretoxin. These results have important implications for the diagnosis and prevention of heat-stable toxin-induced diarrhea.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11044492&dopt=Abstract



Vet Immunol Immunopathol. 2000 Oct 31;76(3-4):199-214.
Increased pulmonary secretion of tumor necrosis factor-alpha in calves experimentally infected with bovine respiratory syncytial virus.

Rontved CM, Tjornehoj K, Viuff B, Larsen LE, Godson DL, Ronsholt L, Alexandersen S.

Laboratory of Veterinary Pathology, Institute of Pharmacology and Pathobiology, The Royal Veterinary and Agricultural University, Ridebanevej 1, DK-1870 Frederiksberg C, Denmark.

Bovine respiratory syncytial virus (BRSV) is an important cause of respiratory disease among calves in the Danish cattle industry. An experimental BRSV infection model was used to study the pathogenesis of the disease in calves. Broncho alveolar lung lavage (BAL) was performed on 28 Jersey calves, of which 23 were experimentally infected with BRSV and five were given a mock inoculum. The presence of the cytokine tumor necrosis factor alpha (TNF-alpha) in the BAL fluids was detected and quantified by a capture ELISA. TNF-alpha was detected in 21 of the infected animals. The amount of TNF-alpha in the BAL fluid of calves killed post inoculation day (PID) 2 and 4 was at the same very low level as in the uninfected control animals. Large amounts of TNF-alpha were detected on PID 6, maximum levels of TNF-alpha were reached on PID 7, and smaller amounts of TNF-alpha were seen on PID 8. The high levels of TNF-alpha appeared on the days where severe lung lesions and clinical signs were obvious and the amounts of BRSV-antigen were at their greatest. Although Pasteurellaceae were isolated from some of the BRSV-infected calves, calves treated with antibiotics before and through the whole period of the infection, as well as BRSV-infected calves free of bacteria reached the same level of TNF-alpha as animals from which bacteria were isolated from the lungs. It is concluded that significant quantities of TNF-alpha are produced in the lungs of the calves on PID 6-7 of BRSV infection. The involvement of TNF-alpha in the pathogenesis of, as well as the anti-viral immune response against, BRSV infection is discussed.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11044554&dopt=Abstract



Neurosci Lett. 2000 Nov 10;294(1):53-7.
Dysfunction of M-channel enhances propagation of neuronal excitability in rat hippocampus monitored by multielectrode dish and microdialysis systems.

Zhu G, Okada M, Murakami T, Kamata A, Kawata Y, Wada K, Kaneko S.

Department of Neuropsychiatry, School of Medicine, Hirosaki University, 036-8562, Hirosaki, Japan.

To explore the pathogenesis of benign familial neonatal convulsions (BFNC), we determined effects of KCNQ-related M-channels (KCNQ-channels) on hippocampal glutamate (Glu) and gamma-aminobutyric acid (GABA) releases using microdialysis, and propagation of evoked field-potentials (FP) using multielectrode (64-ch)-dish system as two-dimensional monitoring. KCNQ-channel inhibitor, Dup996, enhanced hippocampal K(+)-evoked Glu and GABA releases without affecting basal releases of them. Dup996 unaffected FP-amplitude, but enhanced FP-propagation. The GABA(A)-receptor antagonist, bicuculline, enhanced the stimulatory effects of Dup996 on FP-propagation, however, this stimulatory effects of Dup996 were abolished by the alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA)/glutamate-receptor antagonist, DNQX. These results suggest that the occurrence of BFNC cannot be produced by KCNQ-channel dysfunction alone, but by reciprocal action between impaired KCNQ-channel and other unknown elements (possibly dysfunction of inhibitory neurotransmission system).


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11044585&dopt=Abstract



Neurosci Lett. 2000 Nov 10;294(1):63-5.
Promoter polymorphism of the 5-HT transporter and Alzheimer's disease.

Hu M, Retz W, Baader M, Pesold B, Adler G, Henn FA, Rosler M, Thome J.

Laboratory of Biochemistry, Central Institute of Mental Health, J5, 68159, Mannheim, Germany.

The role of the deletion/insertion polymorphism within the promoter region of the serotonin transporter gene (5-HTT) is under discussion as a potential genetic risk factor for Alzheimers's disease (AD). Here we report significant differences in the allelic distribution of this polymorphism with a higher frequency of the short variant allele in AD patients when compared to controls. This difference was independent of the apolipoproteinE genotype. Thus, our study supports the notion that genetic alterations in the serontonergic neurotransmitter system may be involved in the etiopathogenesis of AD. However, given the reported negative findings, we are presently trying to identify diagnostic subgroups for which the 5-HTT promoter polymorphism represents a susceptibility locus.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11044587&dopt=Abstract







Natural Herbal Supplement: Hair Million


Hair loss alone does not pose significant health problems. In fact, there are people who opt for baldness as an alternative hair style. However, in general, however, hair loss is not considered desirable.

The most ostensive feature that distinguishes us human from chimps and other primates is the lack of bodily hair. During evolutionary process, we have lost the majority of hair. Hair is no longer a biologically essential part of our body, just like appendix. The hair we still have on our scalp and a few other bodily parts is still regarded as significant for reasons other than biological necessity. Hair loss is naturally accompanied by aging process, although the extent of hair loss and the timing of onset vary widely among individuals. Thus, loss of hair and baldness is considered as a symbol of maturity or old age. Like winkles and other signs of aging, hair loss is not welcome by most people, because we don't welcome aging, and being perceived as an aging person. However, it is alopecia, or premature hair loss that especially concerns certain people.

While the hair loss and resulting baldness in general have not been proven to be related to underlying health problems, there are certain correlations between hair loss and health problems. For instance, premature hair loss could suggest premature aging or nutritional and hormonal imbalance, stressful life, use of drugs that cause hair loss as a side effect, skin disease, or heart disease. The balding appearance could also impart a subdued impression of integrity in bodily health and youthfulness.












DHEA is a natural hormone, and it is produced in our body by the adrenal glands. DHEA has been suggested to provide numerous potential benefits. DHEA (or dehydroepiandrosterone) is converted into androgens (male hormones) or estrogens (female hormones) in the cells. Our bodies produce decreasing amount of DHEA as we get older. various health benefits: To deter aging, improve sexual function/erectile dysfunction, treat cognitive decline, enhance athletic performance, facilitate weight loss, improve strength, prevent osteoporosis, enhance immunomodulation for rheumatic conditions, and treat depression.





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