Many growth-factor receptors are receptor tyrosine kinases (RTKs) that, when activated, trigger downstream pathways such as PI3K-Akt, and these are the readouts in in-vitro growth-factor research. This guide explains the pathway.
What is a receptor tyrosine kinase?
A receptor tyrosine kinase is a cell-surface receptor that, when a growth factor binds, adds phosphate groups to tyrosine amino acids, switching on downstream signaling.
The PI3K-Akt pathway
One major downstream pathway is PI3K-Akt. Activation of an RTK recruits PI3K, which leads to activation of Akt, a signaling hub. The activation state of Akt is a common readout.
How these are measured
Researchers measure receptor and Akt phosphorylation with immunoassays, or use reporter systems, to quantify pathway activation in cell models.
Interpreting the data
Readouts are compared within a single experiment against controls, because absolute values depend on cell type and conditions.
Related research guides
- Growth-factor & secretagogue (extended)
- IGF-1 LR3 (modified analog)
- Sermorelin (GHRH analog)
- GH secretagogues research overview
Research-use note
All compounds referenced are supplied for in vitro laboratory research use only. They are not for human or animal use.
Related research: Enclomiphene.
