Introduction to Fragment 176-191

Fragment 176–191 is a modified form of the human growth hormone (hGH) polypeptide, specifically designed to isolate and enhance the lipolytic properties associated with the C-terminal region of the hGH molecule. This peptide has emerged as a primary tool in biomedical research focused on understanding and modulating targeted lipolysis (fat breakdown) in various biological models.

Its structure is a precise sequence of amino acids (residues 176-191) that constitutes the putative anti-obesity and fat-reducing region of hGH, but without the proliferative effects on tissue and bone associated with the full-length hormone. This specificity makes it an ideal experimental reagent for metabolic and obesity studies.

Scientific Profile

Fragment 176-191 is recognized for its potent, highly specific action on adipose tissue metabolism. Its profile centers around a unique mechanism of action that promotes fat catabolism without stimulating systemic growth or affecting insulin sensitivity, a common issue with full-length growth hormone.

Mechanism of Action: Targeted Lipolysis

The core mechanism by which Fragment 176-191 exerts its effects is through the upregulation and activation of specific receptors critical to fat breakdown.

Aspect

Description

Receptor/Target

Primary Mechanism

Promotes fat breakdown (lipolysis) in white adipose tissue.

Beta-3 Adrenergic Receptors (ADRB3)

Activation Pathway

Direct stimulation of lipolytic enzymes.

Hormones Sensitive Lipase (HSL) activation

Energy Mobilization

Increases the release of stored fatty acids for oxidation.

Fragment 176–191 is the primary tool for researching targeted lipolysis. Its key action involves:

• Upregulation of Beta-3 Adrenergic Receptors (ADRB3): These receptors are critical for promoting fat breakdown in adipose tissue. By enhancing the expression and activity of ADRB3, the peptide effectively amplifies the signaling cascade that leads to the mobilization of triglycerides from adipocytes.

Thermogenesis and Energy Expenditure

Beyond its direct effects on fat cells, Fragment 176-191 has been demonstrated to influence systemic energy balance through its effects on muscle tissue.

• Stimulation of Energy Expenditure in Skeletal Muscle: Research suggests that the peptide can increase basal metabolic rate and overall energy expenditure by stimulating thermogenic processes in skeletal muscle cells. This leads to a greater consumption of energy, potentially contributing to net fat loss.

Pharmacodynamics and Selectivity

The peptide's short half-life and selective action ensure its effects are confined primarily to metabolic processes rather than somatic growth. This selectivity is a major advantage for research applications where confounding variables related to systemic hormone activity must be minimized.

Key Research Findings in Obesity Models

Extensive research has utilized Fragment 176-191 to explore metabolic disorders, particularly obesity. The findings indicate a highly regulated effect dependent on the subject's metabolic state.

Results from Obese Murine Models

Research in obese mice demonstrates up to a 50% reduction in weight gain when administered Fragment 176-191. This significant finding highlights its potential as a tool for studying obesity interventions.

A critical observation from these studies is the differential effect based on baseline metabolic status:

• Obese Models: Showed a dramatic reduction in body weight gain, primarily due to decreased adipose tissue mass.
• Lean (Wild-type) Animals: Showed no significant change in body weight, suggesting a regulatory feedback loop that limits the peptide's action in metabolically healthy individuals.

This suggests that the peptide’s mechanism may be most pronounced in conditions where ADRB3 signaling or lipolytic pathways are compromised or over-repressed, which is typical in states of chronic obesity.

Research Applications

Fragment 176-191 is designated as an Experimental Reagent and is strictly intended for laboratory and research use. Its specific mode of action makes it an essential tool for several areas of metabolic research.

The peptide is Ideal For the following research applications:

1. Obesity Models: Investigating mechanisms to prevent or reverse diet-induced obesity (DIO).
2. Adipocyte Culture Assays: Studying the molecular pathways of lipolysis and triglyceride metabolism in vitro.
3. Metabolic Rate Studies: Assessing compounds that influence basal metabolic rate and whole-body energy expenditure.
4. Beta-3 Adrenergic Receptor Research: Serving as a selective tool to probe the function and downstream signaling of ADRB3.

Technical Specifications for Researchers

Detailed information regarding handling, stability, and purity is available upon request and is essential for maintaining the integrity of research protocols.

Researchers are advised to consult the following document for detailed preparation and storage guidelines: File

Property

Value

Sequence

H-Tyr-Leu-Arg-Ile-Val-Gln-Cys-Arg-Ser-Val-Glu-Gly-Ser-Cys-Gly-Phe-OH

Molecular Formula

C78H125N23O23S2

Molecular Weight

1817.11 g/mol

Purity

>98% (HPLC)

Storage Conditions

-20°C (lyophilized); 4°C to -20°C (reconstituted solution)

Status: Experimental Reagent.

Disclaimer: This product is sold for research purposes only. It is not intended for human consumption or therapeutic use. All handling and disposal must comply with institutional safety protocols at Place. For inquiries, please contact Person.