peptide-with-ceramide Peptide YY (PYY) and leptin are two crucial hormones that play significant roles in regulating appetite, food intake, and overall energy homeostasis. While both contribute to satiety and weight management, they operate through distinct mechanisms and have varying associations with physiological states like fasting, feeding, and conditions such as obesity and anorexia nervosa作者：CW le Roux·2005·被引用次数：144—The actions of another important peripheral signal of energy homeostasis,leptin, are also mediated through the activation of arcuate POMC neurons (Cowley et al .... Understanding the interplay between peptide YY and leptin offers valuable insights into the complex hormonal control of body weight and appetite.
Peptide YY is a peptide hormone primarily secreted by the L cells in the ileum and colon in response to nutrient ingestion.Serum levels of leptin, ghrelin putative peptide YY-3 in ... It acts as a potent anorexigenic signal, meaning it reduces appetite and food intake. PYY is often referred to as the "ileal brake" due to its role in slowing down gastrointestinal transit and signaling satiety to the brainPeptide YY is a peptide that is secreted from the ileum and colon in response to nutritionand reduces appetite and hence called “ileal brake.” It inhibits the .... Its levels typically rise after a meal, particularly after consuming protein and fats, and remain elevated for a period, contributing to the feeling of fullness. Research indicates that PYY levels are decreased by fasting and elevated following caloric intake.Peptide YY
Studies have explored the therapeutic potential of PYY, particularly its truncated form, PYY(3-36), for inhibiting food intake in obese subjects. This suggests that modulating PYY levels could be a strategy for weight management. Furthermore, some evidence points to a potential link between low circulating PYY concentrations and a predisposition to obesity.
Leptin, on the other hand, is an adipokine, a hormone produced by fat cells (adipocytes). It acts as a long-term regulator of energy balance, signaling to the brain about the body's energy stores. When fat mass increases, leptin levels rise, signaling satiety and promoting energy expenditure to prevent further weight gain.作者：H Buchwald·2014·被引用次数：70—Leptin forms a triad with GLP-1 and PYYin weight regulating mechanisms, possibly providing an autoregulatory function. Leptin stimulates GLP-1 secretion and ... Conversely, when fat mass decreases, leptin levels drop, signaling hunger and encouraging food intake.Constitutional thinness and lean anorexia nervosa display ... Leptin's actions are mediated through appetite circuits in the hypothalamus, where it influences the activity of neurons involved in hunger and satietyChanges in leptin and peptide YY do not explain the .... Leptin also plays a role in regulating food intake, body mass, and reproductive function.
While PYY and leptin both contribute to appetite regulation, their roles are not entirely independent. Leptin has been shown to influence the secretion of other gut hormones, including GLP-1, and may form a triad with GLP-1 and PYY in weight-regulating mechanisms, potentially providing an autoregulatory function. However, the relationship between PYY and leptin is complex and not always direct. For instance, some research suggests that peptide YY levels are not regulated by leptin, despite both hormones influencing food intake.
In conditions like obesity, the interplay between these hormones can become dysregulated.作者：SS Ullrich·2015·被引用次数：24—Ghrelin and PYY areboth involved in short-term regulation, while leptin is a long-term regulator, of energy balance; the acute effects of nutrients on leptin ... While leptin resistance is a known issue in obesity, where the body becomes less responsive to leptin's signals, it appears that obesity does not necessarily lead to PYY resistance.作者：H Buchwald·2014·被引用次数：70—Leptin forms a triad with GLP-1 and PYYin weight regulating mechanisms, possibly providing an autoregulatory function. Leptin stimulates GLP-1 secretion and ... Infusions of PYY in obese subjects can still result in reduced food intake.
Disturbances in leptin and peptide YY have also been observed in certain eating disorders.PYY(3–36) reduces food intake and body weight and ... For example, women with anorexia or bulimia nervosa may exhibit altered levels of leptin, neuropeptide Y, and peptide YY. In constitutional thinness and lean anorexia nervosa, concentrations of peptide YY, glucagon-like peptide 1, ghrelin, and leptin show opposite patterns, highlighting the intricate hormonal balance in these conditions.
Peptide YY and leptin are indispensable hormones in the intricate system that controls hunger and satiety. PYY, a gut-derived hormone, signals satiety after meals and helps regulate short-term food intake. Leptin, released by fat cells, provides a long-term signal about energy stores, influencing appetite and metabolism. Their coordinated action, though complex, is vital for maintaining energy homeostasis. Further research into the interplay between PYY and leptin continues to shed light on potential strategies for managing appetite and weight-related disorders.
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