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Université de Fribourg

Comment les régimes amaigrissants font grossir : d’une perspective d’autorégulation de la composition corporelle

Dulloo, Abdul G. ; Jacquet, Jean ; Seydoux, Josiane ; Montani, Jean-Pierre

In: Cahiers de Nutrition et de Diététique, 2013, vol. 48, no. 1, p. 15–25

‘Dieting Makes You Fat’ – the title of a book published in 1983 – embodies the notion that dieting to control body weight, with consequential weight cycling, predisposes the individual to acquire even more body fat. While this notion is controversial, its debate underscores the large gap, which exists in our understanding of basic physiological laws, which govern the regulation of human...

Université de Fribourg

Heterogeneity in the energy cost of posture maintenance during standing relative to sitting: phenotyping according to magnitude and time-Course

Miles-Chan, Jennifer L. ; Sarafian, Delphine ; Montani, Jean-Pierre ; Schutz, Yves ; Dulloo, Abdul G.

In: PLoS ONE, 2013, vol. 8, no. 5, p. e65827

Background: Reducing sitting-time may decrease risk of disease and increase life-span. In the search for approaches to reduce sitting-time, research often compares sitting to standing and ambulation, but the energetic cost of standing alone versus sitting is equivocal, with large variation in reported mean values (0% to > 20% increase in energy expenditure (EE) during standing).Objective: To...

Université de Fribourg

Quantification of multiple bile acids in uninephrectomized rats using ultra-performance liquid chromatography-tandem mass spectrometry

Penno, Carlos A. ; Arsenijevic, Denis ; Cunha, Thierry Da ; Kullak-Ublic, Gerd A. ; Montani, Jean-Pierre ; Odermatt, Alex

In: Analytical Methods, 2013, vol. 5, p. 1155-1164

In order to study the roles of individual BAs and due to limited blood sample volumes available from experimental animals, improved methods for the simultaneous quantification of multiple BAs are needed. We developed and validated an ultra-performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) method for the quantification of 24 BAs, including 11 unconjugated, 6...

Université de Fribourg

A role for adipose tissue de novo lipogenesis in glucose homeostasis during catch-up growth : a randle cycle favoring fat storage

Marcelino, Helena ; Veyrat-Durebex, Christelle ; Summermatter, Serge ; Sarafian, Delphine ; Miles-Chan, Jennifer ; Arsenijevic, Denis ; Zani, Fabio ; Montani, Jean-Pierre ; Seydoux, Josiane ; Solinas, Giovanni ; Rohner-Jeanrenaud, Françoise ; Dulloo, Abdul G.

In: Diabetes, 2013, vol. 62, no. 2, p. 362-372

Catch-up growth, a risk factor for type 2 diabetes, is characterized by hyperinsulinemia and accelerated body fat recovery. Using a rat model of semistarvation-refeeding that exhibits catch-up fat, we previously reported that during refeeding on a low-fat diet, glucose tolerance is normal but insulin-dependent glucose utilization is decreased in skeletal muscle and increased in adipose tissue,...

Université de Fribourg

Adaptive thermogenesis in human body weight regulation: more of a concept than a measurable entity?

Dulloo, Abdul G. ; Jacquet, Jean ; Montani, Jean-Pierre ; Schutz, Yves

In: Obesity Reviews, 2012, vol. 13, no. S2, p. 105–121

According to Lavoisier, ‘Life is combustion’. But to what extent humans adapt to changes in food intake through adaptive thermogenesis – by turning down the rate of heat production during energy deficit (so as to conserve energy) or turning it up during overnutrition (so as to dissipate excess calories) – has been one of the most controversial issues in nutritional sciences over the past...

Université de Fribourg

Body composition, inflammation and thermogenesis in pathways to obesity and the metabolic syndrome: an overview

Dulloo, Abdul G. ; Montani, Jean-Pierre

In: Obesity Reviews, 2012, vol. 13, no. S2, p. 1–5

According to the World Health Organization, overweight and obesity are defined as abnormal or excessive fat accumulation that presents a risk to health. What constitutes ‘abnormal’ fat accumulation in this definition is not specified, but this most likely represents a consensus term that encapsulates the importance of adipose tissue dysfunctions, rather than solely excess fat per se, in the...

Université de Fribourg

Positive crosstalk between arginase-II and S6K1 in vascular endothelial inflammation and aging

Yepuri, Gautham ; Velagapudi, Srividya ; Xiong, Yuyan ; Rajapakse, Angana G. ; Montani, Jean-Pierre ; Ming, Xiu-Fen ; Yang, Zhihong

In: Aging Cell, 2012, p. -

Augmented activities of both arginase and S6K1 are involved in endothelial dysfunction in aging. This study was to investigate whether or not there is a crosstalk between arginase and S6K1 in endothelial inflammation and aging in senescent human umbilical vein endothelial cells and in aging mouse models. We show increased arginase-II (Arg-II) expression/activity in senescent endothelial cells....

Université de Fribourg

Perspectives of targeting mTORC1–S6K1 in cardiovascular aging

Ming, Xiu-Fen ; Montani, Jean-Pierre ; Yang, Zhihong

In: Frontiers in Vascular Physiology, 2012, vol. 3, p. 5

The global population aging is accelerating and age-associated diseases including cardiovascular diseases become more challenging. The underlying mechanisms of aging and age-associated cardiovascular dysfunction remain elusive. There are substantial evidences demonstrating a pivotal role of the mammalian target of rapamycin complex 1 (mTORC1) and its down-stream effector S6K1 signaling in...

Université de Fribourg

Delaying orthostatic syncope with mental challenge: A pilot study

Goswami, Nandu ; Roessler, Andreas ; Szalkay, Helmut Hinghofer ; Montani, Jean Pierre ; Steptoe, Andrew

In: Physiology & Behavior, 2012, vol. 106, no. 4, p. 569–573

At orthostatic vasovagal syncope there appears to be a sudden decline of sympathetic activity. As mental challenge activates the sympathetic system, we hypothesized that doing mental arithmetic in volunteers driven to the end point of their cardiovascular stability may delay the onset of orthostatic syncope. We investigated this in healthy male subjects. Each subject underwent a head up tilt...