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  • 1
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    A critical role for LTA4H in limiting chronic pulmonary neutrophilic inflammation (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-09-04
    Description: Leukotriene A(4) hydrolase (LTA(4)H) is a proinflammatory enzyme that generates the inflammatory mediator leukotriene B(4) (LTB(4)). LTA(4)H also possesses aminopeptidase activity with unknown substrate and physiological importance; we identified the neutrophil chemoattractant proline-glycine-proline (PGP) as this physiological substrate. PGP is a biomarker for chronic obstructive pulmonary disease (COPD) and is implicated in neutrophil persistence in the lung. In acute neutrophil-driven inflammation, PGP was degraded by LTA(4)H, which facilitated the resolution of inflammation. In contrast, cigarette smoke, a major risk factor for the development of COPD, selectively inhibited LTA(4)H aminopeptidase activity, which led to the accumulation of PGP and neutrophils. These studies imply that therapeutic strategies inhibiting LTA(4)H to prevent LTB(4) generation may not reduce neutrophil recruitment because of elevated levels of PGP.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3072752/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3072752/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Snelgrove, Robert J -- Jackson, Patricia L -- Hardison, Matthew T -- Noerager, Brett D -- Kinloch, Andrew -- Gaggar, Amit -- Shastry, Suresh -- Rowe, Steven M -- Shim, Yun M -- Hussell, Tracy -- Blalock, J Edwin -- 082727/Z/07/Z/Wellcome Trust/United Kingdom -- 1K23DK075788/DK/NIDDK NIH HHS/ -- 1R03DK084110-01/DK/NIDDK NIH HHS/ -- G0400795/Medical Research Council/United Kingdom -- G0802752/Medical Research Council/United Kingdom -- HL07783/HL/NHLBI NIH HHS/ -- HL087824/HL/NHLBI NIH HHS/ -- HL090999/HL/NHLBI NIH HHS/ -- HL102371-A1/HL/NHLBI NIH HHS/ -- K08HL091127/HL/NHLBI NIH HHS/ -- P171/03/C1/048/Medical Research Council/United Kingdom -- P30 DK079337/DK/NIDDK NIH HHS/ -- P30AR050948/AR/NIAMS NIH HHS/ -- P30CA13148/CA/NCI NIH HHS/ -- P50 AT00477/AT/NCCIH NIH HHS/ -- R01 HL077783/HL/NHLBI NIH HHS/ -- R01 HL077783-05/HL/NHLBI NIH HHS/ -- R01 HL087824/HL/NHLBI NIH HHS/ -- R01 HL087824-02/HL/NHLBI NIH HHS/ -- R01 HL090999/HL/NHLBI NIH HHS/ -- R01 HL090999-02S1/HL/NHLBI NIH HHS/ -- R01 HL090999-04/HL/NHLBI NIH HHS/ -- R01 HL102371/HL/NHLBI NIH HHS/ -- RR19231/RR/NCRR NIH HHS/ -- U54CA100949/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2010 Oct 1;330(6000):90-4. doi: 10.1126/science.1190594. Epub 2010 Sep 2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Pulmonary, Allergy and Critical Care Medicine, University of Alabama at Birmingham Lung Health Center, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA. rjs198@imperial.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20813919" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylation ; Animals ; Bronchoalveolar Lavage Fluid/chemistry ; Cells, Cultured ; Chemokines, CXC/metabolism ; Chemotaxis, Leukocyte ; Epoxide Hydrolases/antagonists & inhibitors/isolation & purification/*metabolism ; Female ; Humans ; Inflammation ; Leukotriene B4/metabolism ; Lung/*immunology/metabolism/pathology ; Mice ; Mice, Inbred BALB C ; Mice, Inbred C57BL ; Neutrophils/enzymology/immunology/*physiology ; Oligopeptides/*metabolism ; Orthomyxoviridae Infections/immunology/metabolism/pathology ; Pneumococcal Infections/immunology/metabolism/pathology ; Pneumonia/*immunology/metabolism/pathology/therapy ; Proline/*analogs & derivatives/metabolism ; Pulmonary Disease, Chronic Obstructive/immunology/metabolism/pathology ; *Smoke ; Tobacco
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Interhead tension determines processivity across diverse N-terminal kinesins (2011)
    National Academy of Sciences
    Details
    Publication Date: 2011-09-12
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 3
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    Interhead tension determines processivity across diverse N-terminal kinesins [Biophysics and Computational Biology] (2011)
    National Academy of Sciences
    Details
    Publication Date: 2011-09-28
    Description: Consistent with their diverse intracellular roles, the processivity of N-terminal kinesin motors varies considerably between different families. Kinetics experiments on isolated motor domains suggest that differences in processivity result from differences in the underlying biochemistry of the catalytic heads. However, the length of the flexible neck linker domain also varies from 14 to 18 residues between families. Because the neck linker acts as a mechanical element that transmits interhead tension, altering its mechanical properties is expected to affect both front and rear head gating, mechanisms that underlie processive walking. To test the hypothesis that processivity differences result from family-specific differences in neck linker mechanics, we systematically altered the neck linker length in kinesin-1, -2, -3, -5, and -7 motors and measured run length and velocity in a single-molecule fluorescence assay. Shortening the neck linkers of kinesin-3 (Unc104/KIF1A) and kinesin-5 (Eg5/KSP) to 14 residues enhanced processivity to match kinesin-1, which has a 14-residue neck linker. After substituting a single residue in the last alpha helix of the catalytic core, kinesin-7 (CENP-E) exhibited this same behavior. This convergence of processivity was observed even though motor speeds varied over a 25-fold range. These results suggest that differences in unloaded processivity between diverse kinesins is primarily due to differences in the lengths of their neck linker domains rather than specific tuning of rate constants in their ATP hydrolysis cycles.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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