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Isolating Independent Effects of Diet/Energy Balance and Body Weight on Behavior and Metabolic Health

ABSTRACT: Isolating Independent Effects of Diet/Energy Balance and Body Weight on Behavior and Metabolic Health

PROVIDER: PRJNA413547 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6145700.fastq.gz	Fastqsanger.gz
	SRR6145710.fastq.gz	Fastqsanger.gz
	SRR6145720.fastq.gz	Fastqsanger.gz
	SRR6145730.fastq.gz	Fastqsanger.gz
	SRR6145740.fastq.gz	Fastqsanger.gz

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Isolating Independent Effects of Diet/Energy Balance and Body Weight on Behavior and Metabolic Health

Project description:Associated with numerous metabolic and behavioral abnormalities, obesity is classified by metrics reliant on body weight (such as body mass index). However, overnutrition is the common cause of obesity, and may independently contribute to these obesity-related abnormalities. The goal of this study is to isolate ‘diet/energy balance’ effects independent from ‘body weight’ effects on various metabolic and behavioral parameters using the Diet Switch feeding paradigm in mice. [We conducted] unbiased gene expression analysis of the nutrient-sensing circumventricular hypothalamus [using RNA-seq]. Remarkably, only two genes responded to diet/energy balance (neuropeptide y [npy] and agouti-related peptide [agrp]), while others were related only to body weight. Furthermore, linear regression models revealed that npy and agrp showed similar modifiability by diet/energy balance and body weight compared to electroencephalographic-measured sleep/wake behavior.

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Project description:Psilocybin, and other serotonergic psychedelics, have re-emerged as therapeutics for neuropsychiatric disorders, including addiction. Psilocybin induces long-lasting effects on behavior, likely due to its profound ability to alter consciousness and augment neural connectivity and plasticity. Impaired synaptic plasticity in obesity contributes to ‘addictive-like’ behaviors, including heightened motivation for palatable food, and excessive food seeking and consumption. Here, we evaluate the effects of psilocybin on feeding behavior, energy metabolism and as a weight-lowering agent in mice. We demonstrate that a single dose of psilocybin substantially alters the prefrontal cortex transcriptome but has no acute or long-lasting effects on food intake or body weight in diet-induced obese mice or in genetic mouse models of obesity. Similarly, sub-chronic microdosing of psilocybin has no metabolic effects in obese mice and psilocybin does not augment glucagon-like peptide-1 (GLP-1) induced weight loss or enhance diet-induced weight loss. A single high dose of psilocybin reduces sucrose preference but fails to counter binge-like eating behavior. Although these preclinical data discourage clinical investigation, there may be nuances in the mode of action of psychedelic drugs that are difficult to capture in rodent models, and thus require human evaluation to uncover.

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Early Leptin Intervention Reverses Perturbed Energy Balance Regulating Hypothalamic Neuropeptides in the Pre- and Postnatal Calorie Restricted Offspring

Project description:Pre- and postnatal calorie restriction is associated with postnatal growth restriction, reduced circulating leptin concentrations and perturbed energy balance. Hypothalamic regulation of energy balance demonstrates enhanced orexigenic (NPY, AgRP) and diminished anorexigenic (POMC, CART) neuropeptide expression (PN21) setting the stage for subsequent development of obesity. Leptin replenishment during the early postnatal period (PN2-PN8) led to reversing the hypothalamic orexigenic:anorexigenic neuropeptide ratio at PN21 by only reducing the orexigenic (NPY, AgRP) without affecting the anorexigenic (POMC, CART) neuropeptide expression. This hypothalamic effect was mediated via enhanced leptin receptor (ObRb) signaling that involved increased pSTAT3 but reduced PTP1B. This was further confirmed by an increase in body weight at PN21 in response to intracerebroventricular administration of antisense ObRb oligonucleotides (PN2-PN8). The change in the hypothalamic neuropeptide balance in response to leptin administration caused increased oxygen consumption, carbon dioxide production and physical activity which resulted in increased milk intake (PN14) with no change in body weight. This is in contrast to the reduction in milk intake with no effect on energy expenditure and physical activity observed in controls. We conclude that pre- and postnatal calorie restriction perturbs hypothalamic neuropeptide regulation of energy balance setting the stage for hyperphagia and reduced energy expenditure, hallmarks of obesity. Leptin in turn reverses this phenotype by increasing hypothalamic ObRb signaling (sensitivity) and affecting only the orexigenic arm of the neuropeptide balance.

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