As someone deeply interested in the complexities of gut-derived hormones, I have spent considerable time researching the physiological mechanisms behind satiety an PYY - Peptide YY - Homo sapiens (Human) | UniProtKB d metabolic regulation. One of the most fascinating areas of study involves peptide YY, a 36-amino acid regulatory gut hormone that plays a pivotal role in how our body communicates its nutritional status.
The Biological Origins of PYY
When exploring the peptide YY source, it is essential to understand 21 Oct 2007 — Peptide YY (3-36), a synthetic human PYY 3-36, is a compound being evaluated for the treatment of obesity. It reduces appetite and increases where this molecule originates. Research indicates that PYY is a gut peptide released mainly from the ileum and colon. Specifically, it is synthesized and released from enteroendocrine cells, particularly the L cells of the gastrointestinal tract, which act as the major source of PYY.
These cells are strategically located to respond to the environment of the digestive system. PYY is secreted from endocrine cells in the lower small intestine, colon, and pancreas. Interestingly, while the distal gut is the primary site of production, some studies suggest that skeletal muscle (SkM) may be a source of PYY, broadening our understanding of its systemic reach.
How PYY Functions in the Body
The mechanism of this hormone is quite sophisticated. PYY is released by the gut in response to food intake, acting as a signaling molecule that informs the brain about nutrient status. We know that PYY secretion is influenced by eating; it is a gut-derived hormone secreted alongside glucagon-like peptide-1 (GLP-1) from L-cells.
In terms of temporal dynamics, PYY is released from cells in the ileum and colon in response to feeding, with levels rising rapidly within 15 minutes of a meal. Because PYY is a 36-amino acid peptide related to neuropeptide Y (NPY) and pancreatic polypeptide (PP), it belongs to the pancreatic polypeptide family. It e Peptide YY, appetite and food intake xists primarily in two endogenous forms: PYY(1-36) and the truncated PYY(3-36).
Key Insights and Historical Context
My interest in this subject led me to review early literature, such as the work of K. Tatemoto, who first isolated PYY from porcine intestine in 1982. It is fascinating to note that this gut peptide was originally isolated from porcine intestine before being mapped to human physiology.
Throughout the small intestine, but particularly in the distal ileum, colon, and rectum, mucosal L cells work to produce this hormone. Because PYY is released in response to nutrient intake—speci Peptide YY(3–36) is a gut peptide released mainly from the ileum and colon. It has recently been reported that PYY(3–36) administration produces a dose-related fically triggered by fats and carbohydrates—it acts as a vital feedback loop. It is also a compound being evaluated for the treatment of obesity, as researchers continue to investigate its role in appetite regulation and gastric motility.
Navigating the Search for Knowledge
When you look for information Effect of Peptide YY 3–36 on Food Intake in Humans o by NT Nguyen · 2025 · Cited by 3 — Peptide YY (PYY), a gut-derived hormone secreted alongside glucagon-like peptide-1 (GLP-1) from L-cells, presents a unique and complementary therapeutic n the "peptide YY source," you will often encounter discussions regarding how to influence these levels naturally. Since PYY is one of these gut-derived hormones that responds to dietary triggers, many individuals look at how fiber, protein, and fat intake can modulate the by CW le Roux · 2005 · Cited by 150 — Produced by the intestinal L-cells, the highest tissue concentrations of PYY are found in distal segments of the gastrointestinal tract, although it is present se signals.
It is important to remember that:
* PYY is highly sensitive to the composition of a meal.
* The hormone is secreted by mucosal L cells in the distal ileum, colon, and rectum.
* It acts as both an endocrine and a paracrine agent within the digestive tract.
For those of us tracking these biological markers, understanding that PYY is a gut hormone that was first isolated from porcine intestine provides a clear lineage of how this peptide has been studied over the decades. Whether assessing its role in the pancreatic polypeptide family or its interaction with the brain-gut axis, the study of PYY remains a cornerstone of understanding how the digestive system communicates with the rest of the body. Always ensure you are consulting primary scientific literature to verify the latest findings on this complex regulatory molecule.