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We are currently investigating the molecular mechanism of TLQP-21 induced pro-lipolysis effects and its biological role in humans.
The long term goal is to use molecular and physiological knowledge to develop innovative drugs for the treatment of obesity and type 2 diabetes.
References: 1.Bartolomucci et al., Endocr Rev. 2011;32:755-97; 2.Bartolomucci et al., Proc Natl Acad Sci USA. 2006;103:14584-9; 3.Possenti et al., Biochem J. 2012;441:511-22. 4.Hannedouche S et al., J Biol Chem. 2013;288:27434-43. 5.Cero et al. Structure 2014. 6.Chen YC et al., J Biol Chem. 2013 Oct 8.
Supported by NIH/NIDDK DK102496 and Minnesota Partnership for Biotechnology and Medical Genomics, Decade of Discovery in Diabetes Grant.
A mouse model of Chronic Psychosocial Stress: Energetics, Obesity, Psychpathologies and Aging
Epidemiological evidence demonstrates that psychiatric and metabolic diseases are rising exponentially to pandemic level. A substantial number of obese individuals show eating disorders, psychiatric conditions, stressful life events, more medical complaints and poorer quality of life. Unfortunately, current animal models largely fail to recapitulate the vast array of symptoms which are observed in the obese human population.
We developed a unique mouse model of chronic psychosocial stress [1,2].

We demonstrated that subordinate mice (mice having low social rank) manifest a complex syndrome characterized by a depression-like behavior, increased anxiety, neuroimmune and neuroendocrine abnormalities.
Ongoing projects:
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Role of brown adipose tissue in obesity and Type 2 diabetes: We are investigating the molecular mechanism of subordination stress induced obesity and T2D [3,4]. We recently established that the level of adaptive thermogenesis and the functional status of the brown adipose tissue determine the resilience or the vulnerability to stress-induced vulnerability to diet-induced obesity in mice in spite of similar level of hyperphagia [5]. Specifically, under physiological conditions promoting low adaptive thermogenesis and BAT activity (e.g. housing at mouse thermoneutrality, i.e. 28-30°C or genetic deletion of the βARs), exposure to CSS acts as a stimulus for BAT activation and thermogenesis, resulting in resistance to diet-induced obesity despite the presence of hyperphagia. Conversely, in wt mice acclimatized to room temperature and therefore characterized by sustained BAT function, exposure to CSS increased vulnerability to obesity. Mechanistically we demonstrated that βARs are dispensable for subordination stress-induced BAT browning and identified a stress-inducible sympathetic/brown adipocyte purinergic pathway of browning in mice and showed that it is conserved in humans.
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Aging: We are investigating if stress, hyperphagia and nutrients partitioning will differentially affect ageing and result in accelerated mortality in dominant or subordinate mice. Supported by NIH Transformative Award R01. 1R01AG043972-01. Energetics, Disparities, & Lifespan: a unified hypothesis.
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Binge Eating Disorder: We demonstrated that subordinate mice manifest spontaneous and persistent binge eating-like episodes associated with weight gain and vulnerability to obesity [6]. We are currently investigating the underlying central nervous system pathways regulating stress-induced binging.
References: 1.Bartolomucci A, et al. Physiol Behav. 2001. 2.Bartolomucci et al., Neurosci Biobehav Rev. 2005. 3.Sanghez et al., Psychoneuroendocrinology 2013. 4.Sanghez et al., Stress, 2016. 5.Razzoli et al., Mol Metabol 2016. 6.Razzoli et al., Front Nutr 2015.
In vivo
Indirect calorimetry to determine energy expenditure (Columbus Instruments)
Echo MRI 3-in-1 to determine body-tissue composition (Echo Medical System)
BioDAQ for Food and liquid intake measurements and meal pattern analysis (Research Diets, Inc)
Chronic psychosocial stress model (Custom made)
Phenotyper for home cage phenotyping (Noldus)
Actimeter for home cage locomotor activity (TecnoSmart)
Behavioral tests for anxiety/social interaction/feeding behavior (Manifactured by TecnoSmart)
GTT; ITT; restratin stress

In vitro
Cell culture (3T3L1)
Glycerol assay in mature adipocytes
Multi Channel Real-time PCR (BioRad)
Bio Plex 200 with Luminex Technology (Biorad)
Nexcellom Vision – Cellometer (Nexcellom)
Tissue homogenizer (Pracellis)
Western blot; ELISA, etc.
