title: Cancer derived peptide of vacuolar ATPase 'a2' isoform promotes neutrophil migration by autocrine secretion of IL-8.
abstract: Neutrophils play significant regulatory roles within the tumor microenvironment by directly promoting tumor progression that leads to poor clinical outcomes. Identifying the tumor associated molecules that regulate neutrophil infiltration into tumors may provide new and specific therapeutic targets for cancer treatment. The a2-isoform of vacuolar ATPase (a2V) is uniquely and highly expressed on cancer cell plasma membrane. Cancer cells secrete a peptide from a2V (a2NTD) that promotes the pro-tumorigenic properties of neutrophils. This provides a2V the propensity to control neutrophil migration. Here, we report that the treatment of human neutrophils with recombinant a2NTD leads to neutrophil adherence and polarization. Moreover, a2NTD treatment activates surface adhesion receptors, as well as FAK and Src kinases that are essential regulators of the migration process in neutrophils. Functional analysis reveals that a2NTD can act as a chemo-attractant and promotes neutrophil migration. In addition, a2Neuɸ secrete high levels of IL-8 via NF-κB pathway activation. Confirmatory assays demonstrate that the promoted migration of a2Neuɸ was dependent on the autocrine secretion of IL-8 from a2Neuɸ. These findings demonstrate for the first time the direct regulatory role of cancer associated a2-isoform V-ATPase on neutrophil migration, suggesting a2V as a potential target for cancer therapy.
authors.affiliation: Department of Microbiology and Immunology, Rosalind Franklin University of Medicine and Science, North Chicago, IL, USA.|Department of Microbiology and Immunology, Faculty of Pharmacy, Cairo University, Egypt.
authors.forename: Safaa A
authors.initials: SA
authors.lastname: Ibrahim
authors.affiliation: Department of Microbiology and Immunology, Rosalind Franklin University of Medicine and Science, North Chicago, IL, USA.
authors.forename: Arpita
authors.initials: A
authors.lastname: Kulshrestha
authors.affiliation: Department of Microbiology and Immunology, Rosalind Franklin University of Medicine and Science, North Chicago, IL, USA.
authors.forename: Gajendra K
authors.initials: GK
authors.lastname: Katara
authors.affiliation: Department of Microbiology and Immunology, Faculty of Pharmacy, Cairo University, Egypt.
authors.forename: Magdy A
authors.initials: MA
authors.lastname: Amin
authors.affiliation: Department of Microbiology and Immunology, Rosalind Franklin University of Medicine and Science, North Chicago, IL, USA.
authors.forename: Kenneth D
authors.initials: KD
authors.lastname: Beaman
mesh_terms: D001943:Breast Neoplasms / Q000276:immunology* / Q000378:metabolism; D045744:Cell Line, Tumor; D002465:Cell Movement; D005260:Female; D051417:Focal Adhesion Kinase 1 / Q000378:metabolism; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D006801:Humans; D016209:Interleukin-8 / Q000378:metabolism*; D009504:Neutrophils / Q000166:cytology* / Q000187:drug effects; D010455:Peptides / Q000494:pharmacology*; D006180:Proton-Translocating ATPases / Q000737:chemistry / Q000378:metabolism*; D059016:Tumor Microenvironment; D019061:src-Family Kinases / Q000378:metabolism
chemical_list: C525845:ATP6V0A2 protein, human; C508606:CXCL8 protein, human; D016209:Interleukin-8; D010455:Peptides; D051417:Focal Adhesion Kinase 1; C496050:PTK2 protein, human; D019061:src-Family Kinases; D006180:Proton-Translocating ATPases