Related Experiment Video
Updated: Jun 17, 2025

Assessment of Resistance to Tyrosine Kinase Inhibitors by an Interrogation of Signal Transduction Pathways by Antibody Arrays
Published on: September 19, 2018
Non-Receptor Tyrosine Kinases: Their Structure and Mechanistic Role in Tumor Progression and Resistance
Abdulaziz M Eshaq1,2, Thomas W Flanagan3, Sofie-Yasmin Hassan4
1Department of Epidemiology and Biostatistics, Milken Institute School of Public Health, George Washington University, Washington, DC 20052, USA.
Abstract:
Protein tyrosine kinases (PTKs) function as key molecules in the signaling pathways in addition to their impact as a therapeutic target for the treatment of many human diseases, including cancer. PTKs are characterized by their ability to phosphorylate serine, threonine, or tyrosine residues and can thereby rapidly and reversibly alter the function of their protein substrates in the form of significant changes in protein confirmation and affinity for their interaction with protein partners to drive cellular functions under normal and pathological conditions. PTKs are classified into two groups: one of which represents tyrosine kinases, while the other one includes the members of the serine/threonine kinases. The group of tyrosine kinases is subdivided into subgroups: one of them includes the member of receptor tyrosine kinases (RTKs), while the other subgroup includes the member of non-receptor tyrosine kinases (NRTKs). Both these kinase groups function as an "on" or "off" switch in many cellular functions. NRTKs are enzymes which are overexpressed and activated in many cancer types and regulate variable cellular functions in response to extracellular signaling-dependent mechanisms. NRTK-mediated different cellular functions are regulated by kinase-dependent and kinase-independent mechanisms either in the cytoplasm or in the nucleus. Thus, targeting NRTKs is of great interest to improve the treatment strategy of different tumor types. This review deals with the structure and mechanistic role of NRTKs in tumor progression and resistance and their importance as therapeutic targets in tumor therapy.
Insights
Protein tyrosine kinases (PTKs) are crucial signaling molecules and cancer targets. Non-receptor tyrosine kinases (NRTKs) are particularly important in cancer progression and resistance, making them key therapeutic targets.
Area of Science:
- Molecular Biology
- Cellular Signaling
- Oncology
Background:
- Protein tyrosine kinases (PTKs) are vital signaling molecules implicated in numerous human diseases, notably cancer.
- PTKs regulate cellular functions by phosphorylating protein substrates, altering their confirmation and interactions.
- PTKs are broadly categorized into tyrosine kinases and serine/threonine kinases, with tyrosine kinases further divided into receptor (RTKs) and non-receptor (NRTKs) subgroups.
Purpose of the Study:
- To review the structure and mechanistic role of non-receptor tyrosine kinases (NRTKs) in tumor progression and resistance.
- To highlight the significance of NRTKs as therapeutic targets in cancer therapy.
Main Methods:
- Literature review focusing on NRTK structure, function, and therapeutic potential.
- Analysis of NRTK involvement in cancer signaling pathways, progression, and drug resistance.
Main Results:
- NRTKs are frequently overexpressed and activated in various cancer types.
- NRTK activity, through kinase-dependent and independent mechanisms, influences diverse cellular functions.
- NRTKs play critical roles in both tumor progression and the development of therapeutic resistance.
Conclusions:
- NRTKs are essential regulators of cellular functions in both normal and pathological states.
- Targeting NRTKs presents a promising strategy for enhancing cancer treatment efficacy.
- Understanding NRTK mechanisms is crucial for developing novel anti-cancer therapies.
Related Concept Videos
mTOR Signaling and Cancer Progression
The mTOR pathway or the...
Receptor Tyrosine Kinases
Transducer Mechanism: Enzyme-Linked Receptors
Major types that are helpful drug targets include:
Mitogens and the Cell Cycle
Tumor Progression
Colon cancer is one of the best-documented examples of tumor progression. Early mutation in the APC gene in colon cells causes a small growth on the colon wall called a polyp. With time, this polyp grows into a benign, pre-cancerous tumor. Further...
PI3K/mTOR/AKT Signaling Pathway

