Phenotypic comparison between mesothelial and microvascular endothelial cell lineages using conventional endothelial cell markers, cytoskeletal protein markers and in vitro assays of angiogenic potential.

Differentiation; Research in Biological Diversity
N Chung-WelchD Shepro

Abstract

Endothelial and mesothelial cells are mesodermally derived simple squamous epithelial cells. A controversy concerning the ontogenetic origin of neoplasms derived from these cell types, commonly cited in the literature, is whether Kaposi's sarcoma is a mesothelioma or an angioma. To assess the similarities and differences between these cell types, pulmonary microvascular endothelial cells (PMVEC) and pericardial mesothelial cells (PMC) were cultured in vitro. PMVEC and PMC were found to be difficult to distinguish from one another by histological criteria alone. Both cell types formed contact-inhibited, and 'cobblestone', monolayers typical of simple epithelial cells. PMVEC and PMC demonstrated positive immunoreactivity to Factor VIII-related antigen and angiotensin-converting enzyme (ACE) antigen. They also showed uptake of 1,1'-dioctacecyl-1,3,3,3',3-tetramethyl-indocarbocyanine perchlorate acetylated low density lipoprotein (DiI-Ac-LDL) in 4 h. Both PMVEC and PMC expressed low ACE activities when compared to macrovessel endothelial cells. PMVEC and PMC shared similar isoform profiles for vimentin and actin. Both cell types expressed the simple epithelial keratins, cytokeratins 8 and 19, though PMC contained 50% more cytokerat...Continue Reading

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