Publications by Fiona Hollis | EPFL Graph Search

Glutathione in the nucleus accumbens regulates motivation to exert reward-incentivized effort

Pascal Steiner, Maria del Carmen Sandi Perez, Lijing Xin, Olivia Zanoletti, Fiona Hollis, Alina Veronika Irene Strasser, Ioannis Zalachoras, Simone Astori, João Pedro de Matos Rodrigues, Eva Ramos Fernandez

Emerging evidence is implicating mitochondrial function and metabolism in the nucleus accumbens in motivated performance. However, the brain is vulnerable to excessive oxidative insults resulting from neurometabolic processes, and whether antioxidant level ...

2022

Astrocytic release of ATP through type 2 inositol 1,4,5‐trisphosphate receptor calcium signaling and social dominance behavior in mice

Maria del Carmen Sandi Perez, Jocelin Grosse, Fiona Hollis, Marie-Isabelle Guillot de Suduiraut, Eva Ramos Fernandez

Brain mitochondrial function is critical for numerous neuronal processes. We recently identified a link between brain energy and social dominance, where higher levels of mitochondrial function resulted in increased social competitive ability. The underlyin ...

2020

The glucocorticoid receptor in the nucleus accumbens plays a crucial role in social rank attainment in rodents

Maria del Carmen Sandi Perez, Olivia Zanoletti, Jocelin Grosse, Fiona Hollis, Alexandre Claude Gustave Bacq, Ioannis Zalachoras, Thomas Didier Larrieu, Meltem Weger

Social hierarchy in social species is usually established through competitive encounters with conspecifics. It determines the access to limited resources and, thus, leads to reduced fights among individuals within a group. Despite the known importance of s ...

2020

Therapeutic potential of glutathione-enhancers in stress-related psychopathologies

Pascal Steiner, Maria del Carmen Sandi Perez, Sarah Catherine Sonnay, Fiona Hollis, Laia Morato Fornaguera, Ioannis Zalachoras, Eva Ramos Fernandez

The mammalian brain has high energy demands, which may become higher in response to environmental challenges such as psychogenic stress exposure. Therefore, efficient neutralization of reactive oxygen species that are produced as a by-product of ATP synthe ...

2020

Medium chain triglyceride diet reduces anxiety-like behaviors and enhances social competitiveness in rats

Maria del Carmen Sandi Perez, Carlos Canto Alvarez, Fiona Hollis

Medium-chain triglycerides (MCT) are emerging as unique dietary supplements that are potentially relevant for the amelioration of brain dysfunctions. MCT are converted into ketones and free medium chain fatty acids that, in the brain, are highly effective ...

2018

Diazepam actions in the VTA enhance social dominance and mitochondrial function in the nucleus accumbens by activation of accumbal dopamine D1 receptors

Maria del Carmen Sandi Perez, Carlos Canto Alvarez, Olivia Zanoletti, Jocelin Grosse, Michael van der Kooij, Fiona Hollis, Laura Lozano Montes, Marie-Isabelle Guillot de Suduiraut, Ioannis Zalachoras, Sonia Abad Florensa

Benzodiazepines can ameliorate social disturbances and increase social competition, particularly in high-anxious individuals. However, the neural circuits and mechanisms underlying benzodiazepines’ effects in social competition are not understood. Convergi ...

Nature Publishing Group2018

Acute stress alters individual risk taking in a time-dependent manner and leads to anti-social risk

Maria del Carmen Sandi Perez, Samuel Bendahan, Fiona Hollis, John Christian Thoresen, Lorenz Goette, Leyla Loued-Khenissi

Decision-making processes can be modulated by stress, and the time elapsed from stress induction seems to be a crucial factor in determining the direction of the effects. Although current approaches consider the ﬁrst post-stress hour a uniform period, the ...

2017

Mitochondrial function in the brain links anxiety with social subordination

Maria del Carmen Sandi Perez, Carlos Canto Alvarez, Olivia Zanoletti, Michael van der Kooij, Fiona Hollis, Laura Lozano Montes

Dominance hierarchies are integral aspects of social groups, yet whether personality traits may predispose individuals to a particular rank remains unclear. Here we show that trait anxiety directly influences social dominance in male outbred rats and ident ...

National Academy of Sciences2015

Stress pulls us apart: Anxiety leads to differences in competitive confidence under stress

Maria del Carmen Sandi Perez, Samuel Bendahan, Fiona Hollis, John Christian Thoresen, Lorenz Goette

Social competition is a fundamental mechanism of evolution and plays a central role in structuring individual interactions and communities. Little is known about the factors that affect individuals’ competitive success, particularly in humans. Key factors ...

2015

Methyl Supplementation Attenuates Cocaine-Seeking Behaviors and Cocaine-Induced c-Fos Activation in a DNA Methylation-Dependent Manner

Fiona Hollis

Epigenetic mechanisms, such as histone modifications, regulate responsiveness to drugs of abuse, such as cocaine, but relatively little is known about the regulation of addictive-like behaviors by DNA methylation. To investigate the influence of DNA methyl ...

Soc Neuroscience2015

Social Defeat as an Animal Model for Depression

Fiona Hollis

Depression is one of the most disabling medical conditions in the world today, yet its etiologies remain unclear and current treatments are not wholly effective. Animal models are a powerful tool to investigate possible causes and treatments for human dise ...

Oxford Univ Press2014

The Consequences of adolescent chronic unpredictable stress exposure on brain and behavior

Fiona Hollis

There is increasing evidence for adolescence as a time period vulnerable to environmental perturbations such as stress. What is unclear is the persistent nature of the effects of stress and how specific these effects are to the type of stressor. In this re ...

Elsevier2013