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Compound guide

IGF-1 LR3

From cellular signaling to what those pathways mean in everyday language.

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.

IGF-1 LR3 is an engineered version of insulin-like growth factor 1. It was modified to bind less tightly to some IGF-binding proteins, allowing a larger portion of the molecule to remain available to activate the IGF-1 receptor in experimental systems.

Inside the body

Cellular & MolecularHow IGF-1 LR3 Functions

These receptors, enzymes, and signaling networks form the primary steps connecting this compound with changes inside cells and tissues.

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.

In plain English

What those pathways mean.

01

Tyrosine-kinase activation

Activating this receptor can influence cell growth, survival, and nutrient uptake.

02

Growth + nutrient response

The pathway explains interest in anabolic and metabolic effects.

03

Cell division + differentiation

This pathway is useful for studying development and tissue biology.

How the signals work together

IGF-1 receptor activation begins a growth-and-survival signal. IRS proteins pass the message to PI3K and AKT, while mTOR and MAPK pathways influence protein synthesis, nutrient uptake, cell growth, and cell division.

Read the evidence

Sources BehindThis Guide

Long R3 IGF-I bioavailability studyLong R3 IGF-I reference identity record

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 explains cellular mechanisms and published outcomes 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.