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Université de Fribourg

Stem cell factor-based identification and functional properties of in vitro-selected subpopulations of malignant mesothelioma cells

Blum, Walter ; Pecze, , László ; Felley-Bosco, Emanuela ; Wu, Licun ; Perrot, Marc de ; Schwaller, Beat

In: Stem Cell Reports, 2017, vol. 8, no. 4, p. 1005–1017

Malignant mesothelioma (MM) is an aggressive neoplasm characterized by a poor patient survival rate, because of rapid tumor recurrence following first-line therapy. Cancer stem cells (CSCs) are assumed to be responsible for initiating tumorigenesis and driving relapse after therapeutic interventions. CSC-enriched MM cell subpopulations were identified by an OCT4/SOX2 reporter approach and...

Université de Fribourg

Posttranscriptional regulation controls calretinin expression in malignant pleural mesothelioma

Kresoja-Rakic, Jelena ; Sulemani, Merve ; Kirschner, Michaela B. ; Ronner, Manuel ; Reid, Glen ; Kao, Steven ; Schwaller, Beat ; Weder, Walter ; Stahel, Rolf A.

In: Frontiers in Genetics, 2017, vol. 8, p. -

Calretinin (CALB2) is a diagnostic and prognostic marker in malignant pleural mesothelioma (MPM). We previously reported that calretinin expression is regulated at the mRNA level. The presence of a medium-sized (573 nucleotide) 3′ untranslated region (3′UTR) predicted to contain binding sites for miR-30a/b/c/d/e and miR-9 as well as an adenine/uridine-rich element (ARE) in all three...

Université de Fribourg

The effect of gap junctional coupling on the spatiotemporal patterns of Ca2+ signals and the harmonization of Ca2+-related cellular responses

Dougoud, Michaël ; Vinckenbosch, Laura ; Mazza, Christian ; Schwaller, Beat ; Peczey, László

In: PLOS Computational Biology, 2016, vol. 12, no. 12, p. e1005295

The calcium ion (Ca²⁺), a universal signaling molecule, is widely recognized to play a fundamental role in the regulation of various biological processes. Agonist–evoked Ca²⁺ signals often manifest as rhythmic changes in the cytosolic free Ca²⁺ concentration (ccyt) called Ca²⁺ oscillations. Stimuli intensity was found to be proportional to the oscillation frequency...

Université de Fribourg

Endogenous TRPV1 stimulation leads to the activation of the inositol phospholipid pathway necessary for sustained Ca2+ oscillations

Pecze, László ; Blum, Walter ; Henzi, Thomas ; Schwaller, Beat

In: Biochimica et Biophysica Acta (BBA) - Molecular Cell Research, 2016, vol. 1863, no. 12, p. 2905–2915

Sensory neuron subpopulations as well as breast and prostate cancer cells express functional transient receptor potential vanilloid type 1 (TRPV1) ion channels; however little is known how TRPV1 activation leads to biological responses. Agonist-induced activation of TRPV1 resulted in specific spatiotemporal patterns of cytoplasmic Ca²⁺ signals in breast and prostate cancer-derived cells....

Université de Fribourg

Prenatal valproate exposure differentially affects parvalbumin-expressing neurons and related circuits in the cortex and striatum of mice

Lauber, Emanuel ; Filice, Federica ; Schwaller, Beat

In: Frontiers in Molecular Neuroscience, 2016, vol. 9, p. -

Autism spectrum disorders (ASD) comprise a number of heterogeneous neurodevelopmental diseases characterized by core behavioral symptoms in the domains of social interaction, language/communication and repetitive or stereotyped patterns of behavior. In utero exposure to valproic acid (VPA) has evolved as a highly recognized rodent ASD model due to the robust behavioral phenotype observed in...

Université de Fribourg

Identification of cis- and trans-acting elements regulating calretinin expression in mesothelioma cells

Kresoja-Rakic, Jelena ; Kapaklikaya, Esra ; Ziltener, Gabriela ; Dalcher, Damian ; Santoro, Raffaella ; Christensen, Brock C. ; Johnson, Kevin C. ; Schwaller, Beat ; Weder, Walter ; Stahel, Rolf A. ; Felley-Bosco, Emanuela

In: Oncotarget, 2016, vol. 7, no. 16, p. 21272–21286

Calretinin (CALB2) is a diagnostic marker for epithelioid mesothelioma. It is also a prognostic marker since patients with tumors expressing high calretinin levels have better overall survival. Silencing of calretinin decreases viability of epithelioid mesothelioma cells. Our aim was to elucidate mechanisms regulating calretinin expression in mesothelioma. Analysis of calretinin transcript...

Université de Fribourg

Activation of endogenous TRPV1 fails to induce overstimulation-based cytotoxicity in breast and prostate cancer cells but not in pain-sensing neurons

Pecze, László ; Jósvay, Katalin ; Blum, Walter ; Petrovics, György ; Vizler, Csaba ; Oláh, Zoltán ; Schwaller, Beat

In: Biochimica et Biophysica Acta (BBA) - Molecular Cell Research, 2016, vol. 1863, no. 8, p. 2054–2064

Vanilloids including capsaicin and resiniferatoxin are potent transient receptor potential vanilloid type 1 (TRPV1) agonists. TRPV1 overstimulation selectively ablates capsaicin-sensitive sensory neurons in animal models in vivo. The cytotoxic mechanisms are based on strong Na⁺ and Ca2 + influx via TRPV1 channels, which leads to mitochondrial Ca2 + accumulation and...

Université de Fribourg

Reduction in parvalbumin expression not loss of the parvalbumin-expressing GABA interneuron subpopulation in genetic parvalbumin and shank mouse models of autism

Filice, Federica ; Vörckel, Karl Jakob ; Sungur, Ayse Özge ; Wöhr, Markus ; Schwaller, Beat

In: Molecular Brain, 2016, vol. 9, p. 10

Background A reduction of the number of parvalbumin (PV)-immunoreactive (PV⁺) GABAergic interneurons or a decrease in PV immunoreactivity was reported in several mouse models of autism spectrum disorders (ASD). This includes Shank mutant mice, with SHANK being one of the most important gene families mutated in human ASD. Similar findings were obtained in heterozygous (PV+/-)...