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Compound guide

IGF-1 LR3

A pathway-focused guide to molecular mechanisms, published evidence, and the limits of interpretation.

Overview

A Summary:IGF-1 LR3

IGF-1 LR3 is an 83-amino-acid analogue of insulin-like growth factor 1 engineered to retain IGF-1 receptor activity while binding less strongly to IGF-binding proteins.

It is used in laboratory models of IGF-1 receptor signaling, cell growth and differentiation, nutrient response, and the effect of altered IGF bioavailability.

Its extended activity makes it a potent experimental tool, but most use is in cell and animal research. It is not an approved human-use form of IGF-1.

Research model

Cellular & MolecularHow IGF-1 LR3 Is Studied

These receptors, enzymes, and signaling networks define the primary laboratory questions associated with this research material.

01Tyrosine-kinase activation

IGF-1 receptor

At the cellular or molecular level

IGF-1 LR3 binds the IGF-1 receptor, a receptor tyrosine kinase. Receptor pairing and phosphorylation create docking sites for intracellular signaling proteins.

02Growth + nutrient response

PI3K–AKT–mTOR

At the cellular or molecular level

IRS proteins can connect the activated receptor to PI3K, AKT, and mTOR signaling. This network regulates protein synthesis, glucose transport, and resistance to programmed cell death.

03Cell division + differentiation

RAS–MAPK pathway

At the cellular or molecular level

IGF-1 receptor signaling can also recruit the RAS, RAF, MEK, and ERK cascade, which alters gene expression related to proliferation and differentiation.

Research interpretation

How to read the pathway.

01

Tyrosine-kinase activation

IGF-1 LR3 binds the IGF-1 receptor, a receptor tyrosine kinase.

02

Growth + nutrient response

IRS proteins can connect the activated receptor to PI3K, AKT, and mTOR signaling.

03

Cell division + differentiation

IGF-1 receptor signaling can also recruit the RAS, RAF, MEK, and ERK cascade, which alters gene expression related to proliferation and differentiation.

Evidence boundary

Its extended activity makes it a potent experimental tool, but most use is in cell and animal research. It is not an approved human-use form of IGF-1.

Read the evidence

Sources BehindThis Guide

Long R3 IGF-I bioavailability study (opens in a new tab)Long R3 IGF-I reference identity record (opens in a new tab)

One important note

Educational Notice

IGF-1 LR3 is used mainly in cell and animal research. Human findings from other recombinant IGF-1 medicines cannot be assumed to describe the LR3 analogue.

This guide summarizes molecular mechanisms, published evidence, and evidence limits in everyday language. It is educational information, not medical advice or instructions for personal use. Products offered on this site are intended exclusively for laboratory research and are not for human or veterinary use.