RRC ID 61985
Author Paehler Vor der Nolte A, Chodisetti G, Yuan Z, Busch F, Riederer B, Luo M, Yu Y, Menon MB, Schneider A, Stripecke R, Nikolovska K, Yeruva S, Seidler U.
Title Na+ /H+ exchanger NHE1 and NHE2 have opposite effects on migration velocity in rat gastric surface cells.
Journal J Cell Physiol
Abstract Following superficial injury, neighbouring gastric epithelial cells close the wound by rapid cell migration, a process called epithelial restitution. Na+ /H+ exchange (NHE) inhibitors interfere with restitution, but the role of the different NHE isoforms expressed in gastric pit cells has remained elusive. The role of the basolaterally expressed NHE1 (Slc9a1) and the presumably apically expressed NHE2 (Slc9a2) in epithelial restitution was investigated in the nontransformed rat gastric surface cell line RGM1. Migration velocity was assessed by loading the cells with the fluorescent dye DiR and following closure of an experimental wound over time. Since RGM1 cells expressed very low NHE2 mRNA and have low transport activity, NHE2 was introduced by lentiviral gene transfer. In medium with pH 7.4, RGM1 cells displayed slow wound healing even in the absence of growth factors and independently of NHE activity. Growth factors accelerated wound healing in a partly NHE1-dependent fashion. Preincubation with acidic pH 7.1 stimulated restitution in a NHE1-dependent fashion. When pH 7.1 was maintained during the restitution period, migratory speed was reduced to ∼10% of the speed at pH 7,4, and the residual restitution was further inhibited by NHE1 inhibition. Lentiviral NHE2 expression increased the steady-state pHi and reduced the restitution velocity after low pH preincubation, which was reversible by pharmacological NHE2 inhibition. The results demonstrate that in RGM1 cells, migratory velocity is increased by NHE1 activation, while NHE2 activity inhibit this process. A differential activation of NHE1 and NHE2 may therefore, play a role in the initiation and completion of the epithelial restitution process.
Volume 232(7)
Pages 1669-1680
Published 2017-7-1
DOI 10.1002/jcp.25758
PMID 28019659
PMC PMC5396337
MeSH Animals Cell Line Cell Movement* Gastric Mucosa / cytology* Green Fluorescent Proteins / metabolism HEK293 Cells Humans Hydrogen-Ion Concentration Lentivirus / metabolism Protein Transport RNA, Messenger / genetics RNA, Messenger / metabolism Rats Sodium-Hydrogen Exchanger 1 Sodium-Hydrogen Exchangers / genetics Sodium-Hydrogen Exchangers / metabolism* Wound Healing
IF 5.546
Human and Animal Cells RGM1(RCB0876)