Cdc42 activates paracellular transport in polarised submandibular gland cells

Ken Okabayashi; Mari Nakamura; Takanori Narita

doi:10.1016/j.archoralbio.2021.105276

Cdc42 activates paracellular transport in polarised submandibular gland cells

Arch Oral Biol. 2021 Dec:132:105276. doi: 10.1016/j.archoralbio.2021.105276. Epub 2021 Oct 2.

Authors

Ken Okabayashi¹, Mari Nakamura², Takanori Narita³

Affiliations

¹ Laboratory of Veterinary Biochemistry, Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University, Fujisawa, Kanagawa, Japan.
² Laboratory of Veterinary Biochemistry, Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University, Fujisawa, Kanagawa, Japan; Laboratory of Molecular Biology, Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University, Fujisawa, Kanagawa, Japan; Department of Pharmaceutical and Environmental Sciences, Tokyo Metropolitan Institute of Public Health, Shinjuku, Tokyo, Japan.
³ Laboratory of Molecular Biology, Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University, Fujisawa, Kanagawa, Japan. Electronic address: narita.takanori@nihon-u.ac.jp.

PMID: 34634536
DOI: 10.1016/j.archoralbio.2021.105276

Abstract

Objective: The physiological expression of cell division cycle 42 (cdc42) in major salivary glands, and paracellular transport of fluorescein isothiocyanate-dextran (FITC-dextran) in SMIE cells, which regulate cdc42 expression, was investigated to clarify the involvement of cdc42 in salivary production.

Design: The physiological expression of cdc42 in the rat submandibular gland, parotid gland, sublingual gland, and SMIE cells was detected using SDS-PAGE and western blotting. The paracellular transport of FITC-dextran in transwells was compared in transfected SMIE cells, exhibiting up- or downregulated cdc42 expression.

Results: Cdc42 was expressed in all major salivary glands and SMIE cells. SMIE cells transfected with the cdc42 plasmid had an increase efflux. In addition, SMIE cells transfected with the cdc42 siRNA showed decreased efflux.

Conclusion: We suggest that cdc42 enhances paracellular transport in salivary glands without any morphological changes, including cell-cell adhesion.

Keywords: Cdc42; Paracellular transport; Saliva; Submandibular gland.

MeSH terms

Animals
Blotting, Western
Parotid Gland
Rats
Salivary Glands
Sublingual Gland*
Submandibular Gland*
cdc42 GTP-Binding Protein*

Substances

Cdc42 protein, rat
cdc42 GTP-Binding Protein