Surgical correction of gastroesophageal reflux in lung transplant patients is associated with decreased effector CD8 cells in lung lavages: a case series.
BACKGROUND
Lung transplantation is associated with a high incidence of gastroesophageal reflux disease (GERD). The presence of GERD is considered a risk factor for the subsequent development of obliterative bronchiolitis (OB), and surgical correction of GERD by gastric fundoplication (GF) may be associated with increased freedom from OB. The mechanisms underlying a protective effect from OB remain elusive. The objective of this study was to analyze the flow cytometric properties of BAL cells in patients who have undergone GF early after transplant.


METHODS
In a single-center lung transplant center, eight patients with GERD who were in the first transplant year underwent GF. Prior to and immediately following GF, BAL cells were analyzed by polychromatic flow cytometry. Spirometry was performed before and after GF.


RESULTS
GF was associated with a significant reduction in the frequency of BAL CD8 lymphocytes expressing the intracellular effector marker granzyme B, compared with the pre-GF levels. Twenty-six percent of CD8 cells were granzyme Bhi pre-GF compared with 12% of CD8 cells post-GF (range 8%-50% pre-GF, 2%-24% post-GF, P = .01). In contrast, GF was associated with a significant interval increase in the frequency of CD8 cells with an exhausted phenotype (granzyme Blo, CD127lo, PD1hi) from 12% of CD8 cells pre-GF to 24% post-GF (range 1.7%-24% pre-GF and 11%-47% post-GF, P = .05). No significant changes in spirometry were observed during the study interval.


CONCLUSIONS
Surgical correction of GF is associated with a decreased frequency of potentially injurious effector CD8 cells in the BAL of lung transplant recipients.
Neujahr
David C
DC
Department of Medicine, Emory University School of Medicine, Atlanta, GA 30322, USA. dneujah@emory.edu
Mohammed
Aminu
A
Ulukpo
Onome
O
Force
Seth D
SD
Ramirez
Allan M
AM
Pelaez
Andres
A
Lawrence
E Clinton
EC
Larsen
Christian P
CP
Kirk
Allan D
AD
D015415:Biomarkers / Q000032:analysis; D001992:Bronchoalveolar Lavage Fluid / Q000166:cytology*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D005260:Female; D005434:Flow Cytometry; D005764:Gastroesophageal Reflux / Q000201:enzymology / Q000276:immunology* / Q000601:surgery*; D053804:Granzymes / Q000032:analysis; D006801:Humans; D016040:Lung Transplantation / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000276:immunology*; D013147:Spirometry
D015415:Biomarkers; D053804:Granzymes