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The Journal of Immunology, 2004, 172: 1856-1861.
Copyright © 2004 by The American Association of Immunologists

A Molecular Defect in Intracellular Lipid Signaling in Human Neutrophils in Localized Aggressive Periodontal Tissue Damage1

Karsten Gronert2,*, Alpdogan Kantarci{dagger}, Bruce D. Levy*, Clary B. Clish*, Sabine Odparlik*, Hatice Hasturk{dagger}, John A. Badwey*, Sean P. Colgan*, Thomas E. Van Dyke3,{dagger} and Charles N. Serhan3,4,*

* Department of Anesthesiology, Perioperative and Pain Medicine, Center for Experimental Therapeutics and Reperfusion Injury, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115; and {dagger} Department of Periodontology and Oral Biology, Boston University Goldman School of Dental Medicine, Boston, MA 02118

Host defense mechanisms are impaired in patients with congenital neutrophil (polymorphonuclear neutrophils (PMN)) defects. Impaired PMN chemotaxis is observed in localized aggressive periodontitis (LAP), a familial disorder characterized by destruction of the supporting structures of dentition. In the present studies, we sought evidence for molecular events underlying this aberrant human PMN phenotype. To this end, PMN transendothelial migration and superoxide anion generation were assessed with LAP patients and asymptomatic family members, as well as patients with other chronic mucosal inflammation. PMN from LAP patients showed decreased transmigration across vascular endothelial monolayers (18 ± 12% of control, n = 4) and increased superoxide anion generation (358 ± 37%, p = 0.003). Gene expression was analyzed using oligonucleotide microarrays and fluorescence-based kinetic PCR. cDNA microarray and kinetic-PCR analysis revealed diminished RNA expression of leukocyte-type diacylglycerol (DAG) kinase {alpha} in PMN from LAP patients (4.6 ± 1.7 relative units, n = 6, p = 0.007) compared with asymptomatic individuals (51 ± 27 relative units, n = 7). DAG kinase activity was monitored by DAG phosphorylation and individual DAG molecular species were quantified using liquid chromatography and tandem mass spectrometry-based lipidomics. DAG kinase activity was also significantly decreased (73 ± 2%, p = 0.007) and correlated with increased accumulation of 1,2-diacyl-sn-3-glycerol substrates (p = 0.01). These results implicate defects in both PMN transendothelial migration and PMN DAG kinase {alpha} signaling as disordered functions in LAP. Moreover, they identify a potential molecular lesion in PMN signal transduction that may account for their aberrant responses and tissue destruction in this disease.




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