Characterization of a spontaneously immortalized cell line (IOBA-NHC) from normal human conjunctiva.

Abstract:

PURPOSE:To characterize a new nontransfected, spontaneously immortalized epithelial cell line from normal human conjunctiva (IOBA-NHC), both morphologically and functionally, to determine whether the differentiated phenotype of conjunctival epithelial cells is preserved. METHODS:Outgrowing cells from explanted conjunctival tissue were successively passaged and preliminarily characterized at passage 3 to assess epithelial origin. The cells were further characterized at passages 15 to 20, 40, 60, and 100 by analyzing (1) proliferation and in vitro behavior (viability, plating efficiency, colony forming efficiency and colony size, and Ki-67 protein expression), (2) karyotype and G-banding, (3) epithelial marker expression (cytokeratins, desmoplakins, EGF receptor), (4) absence of contaminating cell types, (5) expression of conjunctival differentiation markers (mucin gene expression), and (6) functional capability in response to proinflammatory stimuli. IOBA-NHC cells were analyzed by light and electron (transmission and scanning) microscopy, immunohistochemistry, electrophoresis and Western blot analysis, flow cytometry, and reverse transcription-polymerase chain reaction (RT-PCR). RESULTS:IOBA-NHC cells showed high proliferative ability in vitro and typical epithelial morphology. Cytokeratins and GalNAc, GluNAc, mannose, and sialic acid residues were immunodetected in these cells. No contaminating cell types were found. MUC1, -2, and -4, but not -5AC or -7 mucin genes were expressed in every cell passage tested. Exposure of cells to inflammatory mediators (IFNgamma and/or TNFalpha) resulted in increased expression of intercellular adhesion molecule (ICAM)-1 and HLA-DR. CONCLUSIONS:Morphologic and functional characterization of the nontransfected, spontaneously immortalized IOBA-NHC cell line shows that this new cell line may be a useful experimental tool in the field of ocular surface cell biology.

authors

Diebold Y,Calonge M,Enríquez de Salamanca A,Callejo S,Corrales RM,Sáez V,Siemasko KF,Stern ME

doi

10.1167/iovs.03-0560

keywords:

subject

Has Abstract

pub_date

2003-10-01 00:00:00

pages

4263-74

issue

10

eissn

0146-0404

issn

1552-5783

journal_volume

44

pub_type

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