scholarly journals Calorie Restriction in Mammals and Simple Model Organisms

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Giusi Taormina ◽  
Mario G. Mirisola
Keyword(s):  
Simple Model ◽  
Calorie Restriction ◽  
Intracellular Signaling ◽  
Caloric Intake ◽  
Model Systems ◽  
Model Organisms ◽  
Calorie Intake ◽  
Health Span ◽  
Beneficial Effects ◽  
Intracellular Signaling Pathways

Calorie restriction (CR), which usually refers to a 20–40% reduction in calorie intake, can effectively prolong lifespan preventing most age-associated diseases in several species. However, recent data from both human and nonhumans point to the ratio of macronutrients rather than the caloric intake as a major regulator of both lifespan and health-span. In addition, specific components of the diet have recently been identified as regulators of some age-associated intracellular signaling pathways in simple model systems. The comprehension of the mechanisms underpinning these findings is crucial since it may increase the beneficial effects of calorie restriction making it accessible to a broader population as well.

The genetics of cell migration in Drosophila melanogaster and Caenorhabditis elegans development

Development ◽  
1999 ◽  
Vol 126 (14) ◽  
pp. 3035-3046 ◽  
Author(s):  
D.J. Montell
Keyword(s):  
Cell Migration ◽  
Caenorhabditis Elegans ◽  
Simple Model ◽  
Molecular Mechanisms ◽  
Small Gtpases ◽  
Model Systems ◽  
Model Organisms ◽  
Cell Movements

Cell migrations are found throughout the animal kingdom and are among the most dramatic and complex of cellular behaviors. Historically, the mechanics of cell migration have been studied primarily in vitro, where cells can be readily viewed and manipulated. However, genetic approaches in relatively simple model organisms are yielding additional insights into the molecular mechanisms underlying cell movements and their regulation during development. This review will focus on these simple model systems where we understand some of the signaling and receptor molecules that stimulate and guide cell movements. The chemotactic guidance factor encoded by the Caenorhabditis elegans unc-6 locus, whose mammalian homolog is Netrin, is perhaps the best known of the cell migration guidance factors. In addition, receptor tyrosine kinases (RTKs), and FGF receptors in particular, have emerged as key mediators of cell migration in vivo, confirming the importance of molecules that were initially identified and studied in cell culture. Somewhat surprisingly, screens for mutations that affect primordial germ cell migration in Drosophila have revealed that enzymes involved in lipid metabolism play a role in guiding cell migration in vivo, possibly by producing and/or degrading lipid chemoattractants or chemorepellents. Cell adhesion molecules, such as integrins, have been extensively characterized with respect to their contribution to cell migration in vitro and genetic evidence now supports a role for these receptors in certain instances in vivo as well. The role for non-muscle myosin in cell motility was controversial, but has now been demonstrated genetically, at least in some cell types. Currently the best characterized link between membrane receptor signaling and regulation of the actin cytoskeleton is that provided by the Rho family of small GTPases. Members of this family are clearly essential for the migrations of some cells; however, key questions remain concerning how chemoattractant and chemorepellent signals are integrated within the cell and transduced to the cytoskeleton to produce directed cell migration. New types of genetic screens promise to fill in some of these gaps in the near future.

scholarly journals Fad Diet

2019 ◽  
pp. 1-11
Author(s):  
Mariam Omar ◽  
Faiza Nouh ◽  
Manal Younis ◽  
Moftah Younis ◽  
Nesma Nabil ◽  
...  
Keyword(s):  
Coronary Heart Disease ◽  
Weight Loss ◽  
Body Composition ◽  
Caloric Intake ◽  
Calorie Intake ◽  
Beneficial Effects ◽  
Effective Role ◽  
The Common ◽  
Successful Weight Loss ◽  
Type Two Diabetes

This paper reviewed the common types of fad diets. Fad diets have an effective role in promoting weight loss, beneficial effects on body composition. Fad diets may protect against the development of obesity and related chronic diseases such as type two diabetes and coronary heart disease. Fad diets work simply because they restrict calorie intake, showing that the most important dietary concept of weight loss and maintenance is a decrease in caloric intake. Based on the contemporary studies on fad diets, the future concept for successful weight loss could run on the concept of energy density, which refers to the amount of energy in a given weight of food.

scholarly journals Metabolic adaptation to calorie restriction

2020 ◽  
Vol 13 (648) ◽  
pp. eabb2490
Author(s):  
Carlos Guijas ◽  
J. Rafael Montenegro-Burke ◽  
Rigo Cintron-Colon ◽  
Xavier Domingo-Almenara ◽  
Manuel Sanchez-Alavez ◽  
...  
Keyword(s):  
Body Temperature ◽  
Calorie Restriction ◽  
Metabolic Response ◽  
Core Body Temperature ◽  
Metabolic Adaptation ◽  
Cognitive Computing ◽  
Active Metabolites ◽  
Health Span ◽  
Beneficial Effects ◽  
Core Body

Calorie restriction (CR) enhances health span (the length of time that an organism remains healthy) and increases longevity across species. In mice, these beneficial effects are partly mediated by the lowering of core body temperature that occurs during CR. Conversely, the favorable effects of CR on health span are mitigated by elevating ambient temperature to thermoneutrality (30°C), a condition in which hypothermia is blunted. In this study, we compared the global metabolic response to CR of mice housed at 22°C (the standard housing temperature) or at 30°C and found that thermoneutrality reverted 39 and 78% of total systemic or hypothalamic metabolic variations caused by CR, respectively. Systemic changes included pathways that control fuel use and energy expenditure during CR. Cognitive computing-assisted analysis of these metabolomics results helped to prioritize potential active metabolites that modulated the hypothermic response to CR. Last, we demonstrated with pharmacological approaches that nitric oxide (NO) produced through the citrulline-NO pathway promotes CR-triggered hypothermia and that leucine enkephalin directly controls core body temperature when exogenously injected into the hypothalamus. Because thermoneutrality counteracts CR-enhanced health span, the multiple metabolites and pathways altered by thermoneutrality may represent targets for mimicking CR-associated effects.

Defining Therapeutic Targets in Simple Model Organisms

2000 ◽  
Vol 1 (2) ◽  
pp. 189-199
Author(s):  
F. Thomas ◽  
C. Neri
Keyword(s):  
Simple Model ◽  
Therapeutic Targets ◽  
Model Organisms

scholarly journals Late-life intermittent fasting decreases aging-related frailty and increases renal hydrogen sulfide production in a sexually dimorphic manner

GeroScience ◽  
2021 ◽  
Author(s):  
Yoko O. Henderson ◽  
Nazmin Bithi ◽  
Christopher Link ◽  
Jie Yang ◽  
Rebecca Schugar ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Dietary Intervention ◽  
Caloric Intake ◽  
Production Capacity ◽  
Late Life ◽  
Model Organisms ◽  
Intermittent Fasting ◽  
Sexually Dimorphic ◽  
Average Life Expectancy ◽  
Multiple Components

AbstractGlobal average life expectancy continues to rise. As aging increases the likelihood of frailty, which encompasses metabolic, musculoskeletal, and cognitive deficits, there is a need for effective anti-aging treatments. It is well established in model organisms that dietary restriction (DR), such as caloric restriction or protein restriction, enhances health and lifespan. However, DR is not widely implemented in the clinic due to patient compliance and its lack of mechanistic underpinnings. Thus, the present study tested the effects of a somewhat more clinically applicable and adoptable DR regimen, every-other-day (EOD) intermittent fasting, on frailty in 20-month-old male and female C57BL/6 mice. Frailty was determined by a series of metabolic, musculoskeletal, and cognitive tasks performed prior to and toward the end of the 2.5-month dietary intervention. Late-life EOD fasting attenuated overall energy intake, hypothalamic inflammatory gene expression, and frailty in males. However, it failed to reduce overall caloric intake and had a little positive effect in females. Given that the selected benefits of DR are dependent on augmented production of the gasotransmitter hydrogen sulfide (H2S) and that renal H2S production declines with age, we tested the effects of EOD fasting on renal H2S production capacity and its connection to frailty in males. EOD fasting boosted renal H2S production, which positively correlated with improvements in multiple components of frailty tasks. Therefore, late-life initiated EOD fasting is sufficient to reduce aging-related frailty, at least in males, and suggests that renal H2S production capacity may modulate the effects of late-life EOD fasting on frailty.

scholarly journals Interaction of dual intracellular signaling pathways activated by the melanocortin-3 receptor.

1994 ◽  
Vol 269 (18) ◽  
pp. 13162-13166
Author(s):  
Y. Konda ◽  
I. Gantz ◽  
J. DelValle ◽  
Y. Shimoto ◽  
H. Miwa ◽  
...  
Keyword(s):  
Signaling Pathways ◽  
Intracellular Signaling ◽  
Intracellular Signaling Pathways

scholarly journals Melatonin in Wine and Beer: Beneficial Effects

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 343
Author(s):  
Javier Marhuenda ◽  
Débora Villaño ◽  
Raúl Arcusa ◽  
Pilar Zafrilla
Keyword(s):  
Intracellular Signaling ◽  
Plasma Concentrations ◽  
Radical Scavenging ◽  
Direct Interaction ◽  
Melatonin Receptors ◽  
Current Evidence ◽  
Sleep Cycle ◽  
Beneficial Effects ◽  
Neuroprotective Actions ◽  
Radical Scavenging Properties

Melatonin is a hormone secreted in the pineal gland with several functions, especially regulation of circadian sleep cycle and the biological processes related to it. This review evaluates the bioavailability of melatonin and resulting metabolites, the presence of melatonin in wine and beer and factors that influence it, and finally the different benefits related to treatment with melatonin. When administered orally, melatonin is mainly absorbed in the rectum and the ileum; it has a half-life of about 0.45–1 h and is extensively inactivated in the liver by phase 2 enzymes. Melatonin (MEL) concentration varies from picograms to ng/mL in fermented beverages such as wine and beer, depending on the fermentation process. These low quantities, within a dietary intake, are enough to reach significant plasma concentrations of melatonin, and are thus able to exert beneficial effects. Melatonin has demonstrated antioxidant, anticarcinogenic, immunomodulatory and neuroprotective actions. These benefits are related to its free radical scavenging properties as well and the direct interaction with melatonin receptors, which are involved in complex intracellular signaling pathways, including inhibition of angiogenesis and cell proliferation, among others. In the present review, the current evidence on the effects of melatonin on different pathophysiological conditions is also discussed.

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