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Biochemistry (Moscow)

, Volume 79, Issue 1, pp 8–15 | Cite as

Basolateral expression of GRP94 in parietal cells of gastric mucosa

  • R. M. ArinEmail author
  • Y. Rueda
  • O. Casis
  • M. Gallego
  • A. I. Vallejo
  • B. Ochoa
Article

Abstract

GRP94 is a member of the heat shock protein family normally confined to the endoplasmic reticulum that sometimes escapes the KDEL-mediated retention system. It is overexpressed in some gastric and other gastrointestinal carcinomas, but little is known about the physiological role of GRP94 in gastric mucosa. We investigated the membrane presence of GRP94 in parietal cells, which secrete acid into the gastric lumen, using subcellular fractionation, selective solubilization of membrane proteins, Western blotting, and radio-ligand binding and provided evidence of functional GRP94 expression at the surface of gastric mucosa parietal cells anchored to the basolateral domain. Our results show that GRP94 is not an integral membrane protein since 50 mM Na2CO3 treatment dissociates part of it from the membrane. However, 100 mM Na2CO3 treatment did not extract all GRP94 from the membrane, which indicates that it is strongly associated with it. The presence of GRP94 in isolated plasma membrane was demonstrated by Western blotting and its functionality by radio-lig- and binding experiments. Both the K D value obtained in saturation experiments with N-ethylcarboxamido-[3H]adenosine at 4°C, at the nanomolar range, and the inhibition constant of its binding by radicicol, the most specific GRP94 inhibitor, indicate that active receptor regions are exposed at the membrane surface. Western blotting of plasma membrane subfractions showed that GRP94 is mainly expressed in the basolateral membrane of gastric parietal cells, while its presence in the apical domain is negligible, thereby inferring a role for GRP94 in processes operating in this membrane domain.

Key words

gastric mucosa parietal cell basolateral polarization molecular chaperone adenosine receptor 

Abbreviations

ER

endoplasmic reticulum

GRP94

glucose-regulated protein of 94 kDa

Hsp

heat shock protein

NECA

N-ethylcarboxamidoadenosine

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Copyright information

© Pleiades Publishing, Ltd. 2014

Authors and Affiliations

  • R. M. Arin
    • 1
    Email author
  • Y. Rueda
    • 1
  • O. Casis
    • 2
  • M. Gallego
    • 2
  • A. I. Vallejo
    • 1
  • B. Ochoa
    • 1
  1. 1.Department of Physiology, Faculty of Medicine and DentistryUniversity of the Basque Country UPV/EHULeioaSpain
  2. 2.Department of Physiology, Faculty of PharmacyUniversity of the Basque Country UPV/EHUVitoria-GasteizSpain

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