Journal Article


John V Reynolds
Emma K Foley
Suzanne Doyle
Stephen Maher
Joanne Lysaght
Ashanty M. Ashanty
Melissa J Conroy
Aideen Long


Medicine & Nursing

inflammation cancer patients memory omentumt cells cx3cr1 immune system diseases cancer cell upper gastrointestinal cancer fractalkine t cell adhesion obesity novel the omentum medicine and health sciences diseases

Identifying a Novel Role for Fractalkine (CX3CL1) in Memory CD8+ T Cell Accumulation in the Omentum of Obesity-Associated Cancer Patients. (2018)

Abstract The omentum is enriched with pro-inflammatory effector memory CD8+ T cells in patients with the obesity-associated malignancy, esophagogastric adenocarcinoma (EAC) and we have identified the chemokine macrophage inflammatory protein-1alpha as a key player in their active migration to this inflamed tissue. More recently, others have established that subsets of memory CD8+ T cells can be classified based on their surface expression of CX3CR1; the specific receptor for the inflammatory chemokine fractalkine. CD8+ T cells expressing intermediate levels (CX3CR1INT) are defined as peripheral memory, those expressing the highest levels (CX3CR1HI) are effector memory/terminally differentiated and those lacking CX3CR1 (CX3CR1NEG) are classified as central memory. To date, the fractalkine:CX3CR1 axis has not been examined in the context of CD8+ T cell enrichment in the omentum and here we examine this chemokines involvement in the accumulation of memory CD8+ T cells in the omentum of EAC patients. Our data show that fractalkine is significantly enriched in the omentum of EAC patients and drives migration of T cells derived from EAC patient blood. Furthermore, CX3CR1 is endocytosed specifically by CD8+ T cells upon encountering fractalkine, which is consistent with the significantly diminished frequencies of CX3CR1INT and CX3CR1HI CD8+ T cells in the fractalkine-rich environment of omentum in EAC, relative to matched blood. Fractalkine-mediated endocytosis of CX3CR1 by CD8+ T cells is sustained and is followed by enhanced surface expression of L-selectin (CD62L). These novel data align with our findings that circulating CX3CR1NEG CD8+ T cells express higher levels of L-selectin than CX3CR1INT CD8+ T cells. This is consistent with previous reports and implicates fractalkine in the conversion of CX3CR1INT CD8+ T cells to a CX3CR1NEG phenotype characterized by alterations in the migratory capacity of these T cells. For the first time, these findings identify fractalkine as a driver of T cell migration to the omentum in EAC and indicate that CD8+ T cells undergo sequenced fractalkine-mediated alterations in CX3CR1 and L-selectin expression. These data implicate fractalkine as more than a chemotactic cytokine in obesity-associated meta-inflammation and reveal a role for this chemokine in the maintenance of the CX3CR1NEG CD8+ T cell populations.
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Full list of authors on original publication

John V Reynolds, Emma K Foley, Suzanne Doyle, Stephen Maher, Joanne Lysaght, Ashanty M. Ashanty, Melissa J Conroy, Aideen Long

Experts in our system

J V Reynolds
Trinity College Dublin
Total Publications: 206
Suzanne L Doyle
Trinity College Dublin
Total Publications: 23
Stephen G Maher
Trinity College Dublin
Joanne Lysaght
Trinity College Dublin
Total Publications: 39
Melissa J Conroy
Trinity College Dublin
Total Publications: 14
Aideen Long
Trinity College Dublin
Total Publications: 71