1) During this FY, the Neutrophil Monitoring Laboratory (NML), our clinical laboratory collaboration managed by Douglas Kuhns, has performed molecular diagnostic studies on 56 patients suspected of having CGD. A total of 29 new X-linked CGD patients were identified as well as 11 autosomal CGD patients. Diagnosis was confirmed by nucleic acid sequencing of a total of 57 CGD patients or carriers. The NML has performed 1,262 superoxide assays and 740 DHR assays to support active clinical protocols relating to CGD. 2) Our group continues its clinical and laboratory studies of the novel Gram-negative CGD pathogen, Granulibacter bethesdensis. During FY13, we continued screening for MDH seropositivity in CGD and other disorders. We have identified additional seropositive CGD patients and are evaluating the progression of seropositivity during convalescence. In collaboration with Joseph Fontana (NIH/NHLBI) we examined Granulibacter seropositivity in patients with sarcoidosis. A study of the antimicrobial activities of monocytes and macrophages from CGD patients and normal subjects against G.bethesdensis has been published (Chu et al., 2013, J Immunology). 3) During FY2013, we analyzed data from NIH Protocol #10-I-0029 Non-invasive Assessment of Atherosclerosis in Patients with CGD and other Disorders of the Immune System (current total = 74 subjects). Atherosclerosis, the major cause of heart disease, is thought to relate to dysregulated inflammation in the cardiac blood vessels and over production of reactive oxygen species (ROS) has been implicated. We hypothesized that CGD patients, who have deficient production of reactive oxygen species by their phagocytes and other cells, may be protected from developing atherosclerosis. The primary endpoint of this study was the assessment of atherosclerotic plaque formation/calcium deposition by CT, MRI and other imaging methodologies, in these and other patients with in-born disorders of immune function. We found significant differences in the incidences of pre-clinical signs of atherosclerosis in CGD patients and have submitted a manuscript describing these findings. 4) This year we studied B-cell function in CGD patients. We reported in Matharu et al. (2013, Clinical Immunology), a significant elevation in the concentrations of B-cell Activating Factor (BAFF) in the serum of CGD patients as well as in normal patients treated intravenously with lipopolysaccharide (LPS). This study also demonstrated the correlations of BAFF with acute phase reactants. Since BAFF is elevated in CGD, we collaborated with James Cimino (NIH Laboratory for Informatics Development) to perform an extensive clinical data-mining study to characterize both total and autoimmune immunoglobulin levels and in the NIH Clinical Center CGD cohort as well as correlate these parameters with other genotypic and phenotypic data. Further analysis is pending. 5) Several years ago, two patients with an undiagnosed disease characterized by increased infections and neutropenia were seen at the NIH. These subjects bore similarities to 2 other families of patients seen over a time frame of 30 years by the LHD. Cellular studies indicated an abnormal neutrophil morphology with frequent nuclear herniations, subnormal chemotaxis, and aberrant cytoskeletal structure. We have identified by biochemical and molecular approaches the molecular defect in this disease and have submitted this paper for publication.

Project Start
Project End
Budget Start
Budget End
Support Year
38
Fiscal Year
2013
Total Cost
$151,622
Indirect Cost
City
State
Country
Zip Code
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Alimchandani, Meghna; Lai, Jin-Ping; Aung, Phyu Phyu et al. (2013) Gastrointestinal histopathology in chronic granulomatous disease: a study of 87 patients. Am J Surg Pathol 37:1365-72
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