Effect of Lubiprostone on Nutritional Status and Pulmonary Function in Adults With Cystic Fibrosis

Cystic fibrosis (CF) results in thickened secretions in multiple organ systems including the lungs and gastrointestinal (GI) tract. Patients commonly suffer from nutritional deficiency, and achieving and maintaining adequate nutrition is an important goal of therapy because it is positively correlated with lung function. Lubiprostone activates chloride channels in the GI tract. Because its mechanism of action closely parallels the disease pathology, lubiprostone has the potential to provide GI benefits beyond the relief of constipation. This project is an observational study to examine the effects of lubiprostone on nutritional status and lung function in adults with CF. Our hypothesis is that lubiprostone will have beneficial effects on nutritional status.

Background: Cystic fibrosis (CF) affects an estimated 30,000 people in the United States. It is caused by a mutation in the gene encoding a protein called cystic fibrosis transmembrane regulator (CFTR). This protein functions as a chloride channel in epithelial cells of multiple organ systems. The mutation results in a dysfunctional or absent CFTR channel and a decrease in chloride secretion, which results in thickened secretions in multiple organ systems including the lungs and gastrointestinal (GI) tract. This patient population commonly suffers from nutritional deficiency, and achieving and maintaining normal nutritional status is an important goal of therapy as body mass index (BMI) is positively correlated with forced expiratory volume in 1 second (FEV1), a measure of pulmonary function. Lubiprostone activates type 2 chloride channels (ClC-2) on the apical membrane of GI epithelial cells. Because its mechanism of action closely parallels the disease pathology, lubiprostone has the potential to provide GI benefits beyond the relief of constipation. Objectives: The proposed pilot project is a prospective observational study to examine the effects of lubiprostone in adults with CF. The specific aims are to determine the effects of lubiprostone on: 1) nutritional markers and 2) pulmonary function in adults with CF. Methods: Adults with CF who are currently taking lubiprostone chronically will be sought for enrollment. Study subjects will be followed for approximately 3-months with serial assessment of indicators of nutrition and pulmonary function. Nutritional markers to be measured include body weight, albumin, prealbumin, and vitamins A, D, and E. Pulmonary function will be assessed by pulmonary function tests, a survey to monitor for symptoms of pulmonary exacerbation, and monitoring of the frequency of hospitalizations and IV antibiotic use. Expected Results: We expect to see a beneficial effect on nutritional markers, body weight, and BMI. We hope this translates into a concomitant improvement in pulmonary function.

Eligibility Criteria:
Inclusion Criteria:

* Planning or currently on chronic lubiprostone therapy (chronic is defined as at least one 24 microgram capsule by mouth every other day
* Body mass index (BMI) of less than 22 for females and less than 23 for males at the initiation of chronic lubiprostone therapy
* Initiation of chronic lubiprostone therapy within 1 month of enrollment
* Age over 18
* Currently taking a multivitamin

Exclusion Criteria:

* History of noncompliance with medications and other CF therapies
* History of hospital admissions for CF exacerbations of ≥2 in the last 6 months
* FEV1 les than 40% of expected (severe dysfunction) at most recent assessment in the ambulatory setting
* Currently registered on a lung transplant waiting list
* Any other condition, in the opinion of the investigators, that interferes with the ability of the study subject to comply with study requirements, confers significant risk, or limits the ability of the subject to complete the study