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Innate Immune Functions of Immature Neutrophils

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ClinicalTrials.gov Identifier: NCT01155674
Recruitment Status : Unknown
Verified February 2010 by University Hospital, Geneva.
Recruitment status was:  Recruiting
First Posted : July 2, 2010
Last Update Posted : July 2, 2010
Sponsor:
Information provided by:
University Hospital, Geneva

Tracking Information
First Submitted Date July 1, 2010
First Posted Date July 2, 2010
Last Update Posted Date July 2, 2010
Study Start Date May 2010
Estimated Primary Completion Date August 2011   (Final data collection date for primary outcome measure)
Current Primary Outcome Measures
 (submitted: July 1, 2010)
Innate immune functions of neutrophils [ Time Frame: 12 months ]
  • Surface expression of receptors of the innate immunity in immature vs. mature neutrophils.
  • Production by immature vs. mature neutrophils of inflammatory mediators and reactive oxygen species in response to bacterial agonists.
  • Chemotaxis of immature vs. mature neutrophils.
  • Phagocytosis of Gram-positive and Gram-negative bacteria by immature vs. mature neutrophils.
  • Ex vivo viability and resistance to apoptosis of immature vs. mature neutrophils.
Original Primary Outcome Measures Same as current
Change History No Changes Posted
Current Secondary Outcome Measures Not Provided
Original Secondary Outcome Measures Not Provided
Current Other Pre-specified Outcome Measures Not Provided
Original Other Pre-specified Outcome Measures Not Provided
 
Descriptive Information
Brief Title Innate Immune Functions of Immature Neutrophils
Official Title Innate Immune Functions of Immature Neutrophils
Brief Summary Polymorphonuclear neutrophils, or granulocytes, are essential effector cells of the innate immune system against bacterial infections. Their role in sepsis has been long established as the primary phagocyte to clear the infectious process. In the early phase of sepsis, one observes a massive recruitment of immature neutrophils from the bone marrow into peripheral blood, the so-called "band forms" or "left shift cells". Despite the daily clinical use of neutrophil band forms count in the care of septic patients and their abundance in septic blood, no information exists on the fate of these cells, nor on their capacity to mount an efficient innate immune response. It is the goal of this proposal to study the fate and the innate immune functions of immature neutrophils obtained in patients with early septic shock. Immature neutrophils will be separated from mature neutrophils. The following functions will be studied ex vivo in mature vs. immature neutrophils from a series of patients with severe sepsis and septic shock: (1) surface expression of receptors of the innate immunity; (2) production of inflammatory mediators and reactive oxygen species in response to bacterial agonists; (3) chemotaxis; (4) phagocytosis of Gram-positive and Gram-negative bacteria; and (5) ex vivo viability (life span) and resistance to apoptosis. Importantly, the investigators have developed and mastered all in vitro assays and cell separation techniques necessary to address and answer these important questions. This project will undoubtedly shed light on the fate and function of a prominent leukocyte population circulating in patients with severe bacterial infections and sepsis.
Detailed Description

Objectives

  1. Primary objective: To determine the innate immune functions of immature neutrophils in comparison to those from mature neutrophils, sampled from patients with severe sepsis and sepsis shock and in control patients (trauma patients and healthy donors (only mature neutrophils in the latter case)
  2. Secondary objectives: To determine the fate and span life of immature neutrophils in comparison to mature neutrophils, sampled from patients with severe sepsis and sepsis shock and in control patients (trauma patients and healthy donors (only mature neutrophils in the latter case).

Inclusion criteria

  • Patients with severe sepsis or septic shock (according to ACCP/FCCM standard definitions) with > 5% immature neutrophils.
  • Patients with a noninfectious systemic inflammatory response syndrome (SIRS), e.g. patients with head trauma or multiple trauma with > 5% immature neutrophils.
  • Healthy donors

Exclusion criteria

  • Severe immunosuppression (e.g. HIV with < 200 CD4/mm3), treatment with glucocorticoids (> 300 mg hydrocortisone/day) or other immunosuppressive therapy
  • Neutropenia (neutrophils < 0.5 G/l).
  • Recent chemotherapy or administration of intravenous immunoglobulins within the last 4 weeks.

Endpoints

  • Surface expression of receptors of the innate immunity in immature vs. mature neutrophils.
  • Production by immature vs. mature neutrophils of inflammatory mediators and reactive oxygen species in response to bacterial agonists.
  • Chemotaxis of immature vs. mature neutrophils.
  • Phagocytosis of Gram-positive and Gram-negative bacteria by immature vs. mature neutrophils.
  • Ex vivo viability and resistance to apoptosis of immature vs. mature neutrophils.
Study Type Observational
Study Design Observational Model: Case-Control
Time Perspective: Prospective
Target Follow-Up Duration Not Provided
Biospecimen Retention:   Samples Without DNA
Description:
No samples retained
Sampling Method Non-Probability Sample
Study Population
  • Patients with severe sepsis or septic shock
  • Patients with a noninfectious systemic inflammatory response syndrome (SIRS)
  • Healthy donors
Condition
  • Sepsis
  • SIRS
Intervention Not Provided
Study Groups/Cohorts
  • Sepsis patients
    Patients presenting sepsis
  • SIRS patients
    Patients presenting with the systemic inflammatory response syndrome
  • Healthy subjects
    Healthy blood donors
Publications * Not Provided

*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
 
Recruitment Information
Recruitment Status Unknown status
Estimated Enrollment
 (submitted: July 1, 2010)
60
Original Estimated Enrollment Same as current
Estimated Study Completion Date October 2011
Estimated Primary Completion Date August 2011   (Final data collection date for primary outcome measure)
Eligibility Criteria

Inclusion Criteria:

  • Patients with severe sepsis or septic shock (according to ACCP/FCCM standard definitions) with > 5% immature neutrophils.
  • Patients with a noninfectious systemic inflammatory response syndrome (SIRS), e.g. patients with head trauma or multiple trauma with > 5% immature neutrophils.
  • Healthy donors

Exclusion Criteria:

  • Severe immunosuppression (e.g. HIV with < 200 CD4/mm3), treatment with glucocorticoids (> 300 mg hydrocortisone/day) or other immunosuppressive therapy
  • Neutropenia (neutrophils < 0.5 G/l).
  • Recent chemotherapy or administration of intravenous immunoglobulins within the last 4 weeks.
Sex/Gender
Sexes Eligible for Study: All
Ages 18 Years and older   (Adult, Older Adult)
Accepts Healthy Volunteers Yes
Contacts Contact information is only displayed when the study is recruiting subjects
Listed Location Countries Switzerland
Removed Location Countries  
 
Administrative Information
NCT Number NCT01155674
Other Study ID Numbers CER 09-311
Has Data Monitoring Committee No
U.S. FDA-regulated Product Not Provided
IPD Sharing Statement Not Provided
Responsible Party Professor Jérôme Pugin, University Hospitals of Geneva
Study Sponsor University Hospital, Geneva
Collaborators Not Provided
Investigators Not Provided
PRS Account University Hospital, Geneva
Verification Date February 2010