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Université de Fribourg

Gene expression analysis in the mouse brainstem identifies Cart and Nesfatin as neuropeptides coexpressed in the Calbindin-positive neurons of the Nucleus papilio

Girard, Franck ; von Siebenthal, Michelle ; Davis, Fred P. ; Celio, Marco R.

In: Sleep, 2020, vol. 43, no. 2020-11, p. zsaa085

Study Objectives: The brainstem contains several neuronal populations, heterogeneous in terms of neurotransmitter/neuropeptide content, which are important for controlling various aspects of the rapid eye movement (REM) phase of sleep. Among these populations are the Calbindin (Calb)-immunoreactive NPCalb neurons, located in the Nucleus papilio, within the dorsal paragigantocellular nucleus...

Université de Fribourg

Parvalbumin-deficiency accelerates the age-dependent ROS production in Pvalb neurons in vivo: link to neurodevelopmental disorders

Janickova, Lucia ; Schwaller, Beat

In: Frontiers in Cellular Neuroscience, 2020, vol. 14, p. -

In neurodevelopmental disorders (NDDs) including autism spectrum disorder (ASD) and schizophrenia, impairment/malfunctioning of a subpopulation of interneurons expressing the calcium-binding protein parvalbumin (PV) –here termed Pvalb neurons– has gradually emerged as a possible cause. These neurons may represent a hub or point-of-convergence in the etiology of NDD. Increased oxidative...

Université de Fribourg

Absence of parvalbumin increases mitochondria volume and branching of dendrites in inhibitory Pvalb neurons in vivo: a point of convergence of autism spectrum disorder (ASD) risk gene phenotypes

Janickova, Lucia ; Rechberger, Karin Farah ; Wey, Lucas ; Schwaller, Beat

In: Molecular Autism, 2020, vol. 11, no. 1, p. 47

In fast firing, parvalbumin (PV)-expressing (Pvalb) interneurons, PV acts as an intracellular Ca2+ signal modulator with slow-onset kinetics. In Purkinje cells of PV−/− mice, adaptive/homeostatic mechanisms lead to an increase in mitochondria, organelles equally capable of delayed Ca2+ sequestering/buffering. An inverse regulation of PV and mitochondria likewise operates in cell model...

Université de Fribourg

Profiling parvalbumin interneurons using iPSC: challenges and perspectives for Autism Spectrum Disorder (ASD)

Filice, Federica ; Schwaller, Beat ; Michel, Tanja M. ; Grünblatt, Edna

In: Molecular Autism, 2020, vol. 11, no. 1, p. 10

Autism spectrum disorders (ASD) are persistent conditions resulting from disrupted/altered neurodevelopment. ASD multifactorial etiology—and its numerous comorbid conditions—heightens the difficulty in identifying its underlying causes, thus obstructing the development of effective therapies. Increasing evidence from both animal and human studies suggests an altered functioning of the...

Université de Fribourg

Neurons in the Nucleus papilio contribute to the control of eye movements during REM sleep

Gutierrez Herrera, C. ; Girard, Franck ; Bilella, Alessandro ; Gent, T. C. ; Roccaro-Waldmeyer, Diana M. ; Adamantidis, A. ; Celio, Marco R.

In: Nature Communications, 2019, vol. 10, no. 1, p. 1–11

Rapid eye movements (REM) are characteristic of the eponymous phase of sleep, yet the underlying motor commands remain an enigma. Here, we identified a cluster of Calbindin-D28K-expressing neurons in the Nucleus papilio (NPCalb), located in the dorsal paragigantocellular nucleus, which are active during REM sleep and project to the three contralateral eye-muscle nuclei. The firing of...

Université de Fribourg

Laughter is in the air: Involvement of key nodes of the emotional motor system in the anticipation of tickling

Wattendorf, Elise ; Westermann, Birgit ; Fiedler, Klaus ; Ritz, Simone ; Redmann, Annetta ; Pfannmöller, Jörg ; Lotze, Martin ; Celio, Marco R

In: Social Cognitive and Affective Neuroscience, 2019, p. -

In analogy to the appreciation of humor, that of tickling is based upon the re- interpretation of an anticipated emotional situation. Hence, the anticipation of tickling contributes to the final outburst of ticklish laughter. To localize the neuronal substrates of this process, fMRI was conducted on 31 healthy volunteers. The state of anticipation was simulated by generating an uncertainty...

Université de Fribourg

Parvalbumin expression in oligodendrocyte-like CG4 cells causes a reduction in mitochondrial volume, attenuation in reactive oxygen species production and a decrease in cell processes’ length and branching

Lichvarova, Lucia ; Blum, Walter ; Schwaller, Beat ; Szabolcsi, Viktoria

In: Scientific Reports, 2019, vol. 9, no. 1, p. 10603

Forebrain glial cells - ependymal cells and astrocytes -acquire upon injury- a “reactive” phenotype associated with parvalbumin (PV) upregulation. Since free radicals, e.g. reactive oxygen species (ROS) play a role in the pathogenesis of multiple sclerosis, and that PV-upregulation in glial cells is inversely correlated with the level of oxidative stress, we hypothesized that...