title: Application of an Image Cytometry Protocol for Cellular and Mitochondrial Phenotyping on Fibroblasts from Patients with Inherited Disorders.
abstract: Cellular phenotyping of human dermal fibroblasts (HDFs) from patients with inherited diseases provides invaluable information for diagnosis, disease aetiology, prognosis and assessing of treatment options. Here we present a cell phenotyping protocol using image cytometry that combines measurements of crucial cellular and mitochondrial parameters: (1) cell number and viability, (2) thiol redox status (TRS), (3) mitochondrial membrane potential (MMP) and (4) mitochondrial superoxide levels (MSLs). With our protocol, cell viability, TRS and MMP can be measured in one small cell sample and MSL on a parallel one. We analysed HDFs from healthy individuals after treatment with various concentrations of hydrogen peroxide (H2O2) for different intervals, to mimic the physiological effects of oxidative stress. Our results show that cell number, viability, TRS and MMP decreased, while MSL increased both in a time- and concentration-dependent manner. To assess the use of our protocol for analysis of HDFs from patients with inherited diseases, we analysed HDFs from two patients with very long-chain acyl-CoA dehydrogenase (VLCAD) deficiency (VLCADD), one with a severe clinical phenotype and one with a mild one. HDFs from both patients displayed increased MSL without H2O2 treatment. Treatment with H2O2 revealed significant differences in MMP and MSL between HDFs from the mild and the severe patient. Our results establish the capacity of our protocol for fast analysis of cellular and mitochondrial parameters by image cytometry in HDFs from patients with inherited metabolic diseases.
authors.affiliation: Department of Clinical Medicine, Research Unit for Molecular Medicine (MMF), Aarhus University Hospital, Brendstrupgaardsvej 100, 8200, Aarhus, Denmark. paula.fernandez.guerra@clin.au.dk.
authors.forename: Paula
authors.initials: P
authors.lastname: Fernandez-Guerra
authors.affiliation: Department of Clinical Medicine, Research Unit for Molecular Medicine (MMF), Aarhus University Hospital, Brendstrupgaardsvej 100, 8200, Aarhus, Denmark.
authors.forename: M
authors.initials: M
authors.lastname: Lund
authors.affiliation: Department of Biomedicine, Aarhus University, Aarhus, Denmark.
authors.forename: T J
authors.initials: TJ
authors.lastname: Corydon
authors.affiliation: Department of Clinical Medicine, Research Unit for Molecular Medicine (MMF), Aarhus University Hospital, Brendstrupgaardsvej 100, 8200, Aarhus, Denmark.|Department of clinical Genetics, Applied Human Molecular Genetics, Kennedy Center, Copenhagen University Hospital, Rigshospitalet, Glostrup, Denmark.
authors.forename: N
authors.initials: N
authors.lastname: Cornelius
authors.affiliation: Department of Clinical Medicine, Research Unit for Molecular Medicine (MMF), Aarhus University Hospital, Brendstrupgaardsvej 100, 8200, Aarhus, Denmark.
authors.forename: N
authors.initials: N
authors.lastname: Gregersen
authors.affiliation: Department of Clinical Medicine, Research Unit for Molecular Medicine (MMF), Aarhus University Hospital, Brendstrupgaardsvej 100, 8200, Aarhus, Denmark.
authors.forename: J
authors.initials: J
authors.lastname: Palmfeldt
authors.affiliation: Department of Clinical Medicine, Research Unit for Molecular Medicine (MMF), Aarhus University Hospital, Brendstrupgaardsvej 100, 8200, Aarhus, Denmark. peter.bross@clin.au.dk.
authors.forename: Peter
authors.initials: P
authors.lastname: Bross