Host and Bacterial Mechanisms During Cystic Fibrosis Pulmonary Exacerbations

Host and Bacterial Mechanisms in Recovering FEV1 After Pulmonary Exacerbations in Patients With Cystic Fibrosis

Status

Completed

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT04354038

Enrollment

Registered

2020-04-21

Start date

2020-01-07

Completion date

2023-09-22

Last updated

2026-04-13

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Cystic Fibrosis

Brief summary

Cystic fibrosis pulmonary exacerbations (CF PEx) vary greatly in their severity, their pathogens, and their treatment responses. A failure to return to baseline lung function after treatment may be due to persistent infection or chronic inflammation or both. This constant infection and inflammation are believed to be tightly connected, making it difficult to know the exact reason why some patients fail to respond to treatment. The purpose of this study is to evaluate both infection and inflammation during CF PEx to allow for more personalized approaches to improve lung function responses and better CF PEx outcomes. Subjects will be asked to be in the study if they have CF, are 18 years of age or older, and are starting on IV antibiotics due to worsening lung infection. Subjects will stay in the study for up to 5 years, with visits occurring once a year if hospitalized for a CF PEx. Each visit will have blood, sputum, and urine collected and analyzed for changes in expression of certain genes and proteins. These changes may relate to improvements felt by people living with CF and determine what treatments are most helpful.

Interventions

None listed

Study design

Observational model

COHORT

Time perspective

PROSPECTIVE

Eligibility

Sex/Gender

ALL

Age

18 Years to No maximum

Healthy volunteers

Inclusion criteria

* CF patients 18 years or older * hospitalized for IV treatment of an acute pulmonary exacerbation * not on investigational drugs * who can provide written consent and are willing to comply with study procedure

Exclusion criteria

• the presence of a condition or abnormality that, in the opinion of the Principal Investigator, would compromise the safety of the patient or the quality of the data.

Design outcomes

Primary

Measure	Time frame	Description
Change between FEV1 and Th17/PD-1 expression during the course of treatment for pulmonary exacerbations using flow cytometry	Onset and end of CF pulmonary exacerbations, on average 10 days apart	There is a Th17 skewing association with a failure to return to baseline FEV1 values post pulmonary exacerbation, as measured using conventional flow cytometry followed by linear mixed effects models.
Change between FEV1 and Th17/PD-1 expression over time using flow cytometry	From initial CF pulmonary exacerbation to subsequent CF pulmonary exacerbation, assessed over a period of 60 months	There is a Th17 skewing association with a failure to return to baseline FEV1 values post pulmonary exacerbation, as measured using conventional flow cytometry followed by linear mixed effects models.
Change in FEV1 and Th1/Th2/Th17 gene expression during the course of treatment for pulmonary exacerbations using single cell sequencing	Onset and end of CF pulmonary exacerbations, on average 10 days apart	Gene expression changes, with a particular emphasis on the relationship between changing cell composition (Th1, Th2, and Th17) single cell gene expression and FEV1 recovery, as measured by single cell sequencing of CD4+CD45RO+ memory cells, may be associated with a failure to return to baseline FEV1 during the course of treatment.
Change in FEV1 and Th1/Th2/Th17 gene expression over time using single cell sequencing	From initial CF pulmonary exacerbation to subsequent CF pulmonary exacerbation, assessed over a period of 60 months	Gene expression changes, with a particular emphasis on the relationship between changing cell composition (Th1, Th2, and Th17) single cell gene expression and FEV1 recovery, as measured by single cell sequencing of CD4+CD45RO+ memory cells, may be associated with a failure to return to baseline FEV1 over time.
Comparison of Th17 vs Th2 TCR repertoires during the course of treatment for pulmonary exacerbations through bulk TCR beta sequencing	Onset and end of CF pulmonary exacerbations, on average 10 days apart	Examining if an expanded clone within the Th17 lineage translates to greater inflammation and poorer FEV1 response during the course of treatment as measured by bulk TCR beta sequencing.
Comparison of Th17 vs Th2 TCR repertoires over time through bulk TCR beta sequencing	From initial CF pulmonary exacerbation to subsequent CF pulmonary exacerbation, assessed over a period of 60 months	Examining if an expanded clone within the Th17 lineage translates to greater inflammation and poorer FEV1 response over time as measured by bulk TCR beta sequencing.

Countries

United States

Outcome results