A polarized salivary cell monolayer useful for studying transepithelial fluid movement in vitro.
There are no reported, convenient in vitro models for studying polarized functions in salivary epithelial cells. Accordingly, we examined three often-used salivary cell lines for their ability to form a polarized monolayer on permeable, collagen-coated polycarbonate filters. Only the SMIE line, derived from rat submandibular gland, had this ability. The SMIE cell monolayer exhibited junctional complexes, with a tight-junction-associated protein, ZO-1, localized to cell-cell contact areas. The Na+/K+-ATPase alpha1-subunit was detected predominantly in the basolateral membranes, while the Na+/H+ exchanger isoform 2 appeared primarily in the apical membranes. Using adenovirus-mediated cDNA transfer, SMIE cells were shown to be capable of routing marker proteins (beta-galactosidase +/- a nuclear targeting signal, alpha1-antitrypsin, aquaporin-1) to appropriate locations. Furthermore, this salivary cell monolayer provided a convenient tool for studying aquaporin-1-mediated, osmotically directed, transepithelial fluid movement in vitro. Thus, SMIE cells appear to be a useful experimental model with which to study some polarized functions in a salivary epithelial cell line.
He
X
X
Gene Therapy and Therapeutics Branch, National Institute of Dental Research, 10 Center Drive, MSC 1190, Bldg 10/Rm 1N113, Bethesda MD 20892-1190, USA.
Kuijpers
G A
GA
Goping
G
G
Kulakusky
J A
JA
Zheng
C
C
Delporte
C
C
Tse
C M
CM
Redman
R S
RS
Donowitz
M
M
Pollard
H B
HB
Baum
B J
BJ
D000256:Adenoviridae; D000818:Animals; D051398:Aquaporin 1; D020346:Aquaporins; D001789:Blood Group Antigens; D002450:Cell Communication; D002461:Cell Line, Transformed; D002462:Cell Membrane / Q000737:chemistry; D016764:Cell Polarity; D018076:DNA, Complementary; D004847:Epithelial Cells / Q000502:physiology / Q000648:ultrastructure; D018014:Gene Transfer Techniques; D006801:Humans; D007365:Intercellular Junctions / Q000737:chemistry; D007473:Ion Channels / Q000235:genetics / Q000502:physiology; D008565:Membrane Proteins / Q000032:analysis; D008854:Microscopy, Electron; D009997:Osmotic Pressure; D010750:Phosphoproteins / Q000032:analysis; D051381:Rats; D017923:Sodium-Hydrogen Exchangers / Q000032:analysis; D000254:Sodium-Potassium-Exchanging ATPase / Q000032:analysis; D013363:Submandibular Gland / Q000502:physiology* / Q000648:ultrastructure*; D062826:Zonula Occludens-1 Protein; D000515:alpha 1-Antitrypsin / Q000235:genetics; D001616:beta-Galactosidase / Q000235:genetics
C496020:AQP1 protein, human; C496022:Aqp1 protein, rat; D020346:Aquaporins; D001789:Blood Group Antigens; D018076:DNA, Complementary; D007473:Ion Channels; D008565:Membrane Proteins; D010750:Phosphoproteins; D017923:Sodium-Hydrogen Exchangers; C569042:TJP1 protein, human; C569044:Tjp1 protein, rat; D062826:Zonula Occludens-1 Protein; D000515:alpha 1-Antitrypsin; D051398:Aquaporin 1; D001616:beta-Galactosidase; D000254:Sodium-Potassium-Exchanging ATPase