Nicola Cotugno1, Andrea Finocchi1, Alberto Cagigi2, Gigliola Di Matteo1, Maria Chiriaco1, Silvia Di Cesare1, Paolo Rossi1, Alessandro Aiuti3, Paolo Palma4, Iyadh Douagi5. 1. University Department of Pediatrics, Unit of Immune and Infectious Diseases, Children's Hospital Bambino Gesù, Rome, Italy; Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy. 2. University Department of Pediatrics, Unit of Immune and Infectious Diseases, Children's Hospital Bambino Gesù, Rome, Italy. 3. University Department of Pediatrics, Unit of Immune and Infectious Diseases, Children's Hospital Bambino Gesù, Rome, Italy; Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy; TIGET, Scientific Institute San Raffaele, Milan, Italy. Electronic address: aaiuti@gmail.com. 4. University Department of Pediatrics, Unit of Immune and Infectious Diseases, Children's Hospital Bambino Gesù, Rome, Italy. Electronic address: paolo.palma@opbg.net. 5. Center for Hematology and Regenerative Medicine (HERM), Department of Medicine Huddinge, Karolinska Institutet, Stockholm, Sweden. Electronic address: iyadh.douagi@ki.se.
Abstract
BACKGROUND: Chronic granulomatous disease (CGD) is a primary immune deficiency characterized by a defect in reactive oxygen species production. Although the effect of CGD mainly reflects on the phagocytic compartment, B-cell responses are also impaired in patients with CGD. OBJECTIVE: We sought to investigate how defective gp91(phox) expression in patients with CGD and CGD carriers might affect the B-cell compartment and maintenance of long-term memory. METHODS: We studied the B-cell compartment of patients with CGD in terms of phenotype and ability to produce reactive oxygen species and proliferate on stimuli differently directed to the B-cell receptor and Toll-like receptor 9. We further studied their capacity to maintain long-term memory by measuring cellular and serologic responses to measles. RESULTS: We show that the memory B-cell compartment is impaired among patients with CGD, as indicated by reduced total (CD19(+)CD27(+)) and resting (CD19(+)CD27(+)CD21(+)) memory B cells in parallel to increased naive (CD19(+)CD27(-)IgD(+)) B-cell frequencies. Data on CGD carriers reveal that such alterations are related to gp91(phox) expression. Moreover, proliferative capabilities of B cells on selective in vitro stimulation of B-cell receptor or Toll-like receptor 9 pathways were reduced in patients with CGD compared with those seen in age-matched healthy control subjects. Significantly lower measles-specific antibody levels and antibody-secreting cell numbers were also observed, indicating a poor ability to maintain long-term memory in these patients. CONCLUSION: Altogether, our data suggest that patients with CGD present a defective B-cell compartment in terms of frequencies of memory B cells, response to in vitro stimulation, and maintenance of long-term antigen-specific memory.
BACKGROUND:Chronic granulomatous disease (CGD) is a primary immune deficiency characterized by a defect in reactive oxygen species production. Although the effect of CGD mainly reflects on the phagocytic compartment, B-cell responses are also impaired in patients with CGD. OBJECTIVE: We sought to investigate how defective gp91(phox) expression in patients with CGD and CGD carriers might affect the B-cell compartment and maintenance of long-term memory. METHODS: We studied the B-cell compartment of patients with CGD in terms of phenotype and ability to produce reactive oxygen species and proliferate on stimuli differently directed to the B-cell receptor and Toll-like receptor 9. We further studied their capacity to maintain long-term memory by measuring cellular and serologic responses to measles. RESULTS: We show that the memory B-cell compartment is impaired among patients with CGD, as indicated by reduced total (CD19(+)CD27(+)) and resting (CD19(+)CD27(+)CD21(+)) memory B cells in parallel to increased naive (CD19(+)CD27(-)IgD(+)) B-cell frequencies. Data on CGD carriers reveal that such alterations are related to gp91(phox) expression. Moreover, proliferative capabilities of B cells on selective in vitro stimulation of B-cell receptor or Toll-like receptor 9 pathways were reduced in patients with CGD compared with those seen in age-matched healthy control subjects. Significantly lower measles-specific antibody levels and antibody-secreting cell numbers were also observed, indicating a poor ability to maintain long-term memory in these patients. CONCLUSION: Altogether, our data suggest that patients with CGD present a defective B-cell compartment in terms of frequencies of memory B cells, response to in vitro stimulation, and maintenance of long-term antigen-specific memory.
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