Cell cycle regulation pathway

The cell cycle regulation pathway is a complex network that governs the progression of cells through the various phases of the cell cycle (G1, S, G2, and M) and ensures orderly cell division. This pathway involves core protein families, including cyclin-dependent kinases (CDKs), their cyclin partners, endogenous CDK inhibitors, phosphatases, and critical checkpoints that monitor DNA integrity and cellular conditions before transitions between phases[4][5][6][7]. Dysregulation of this pathway is a hallmark of many cancers and other diseases characterized by uncontrolled cell proliferation[1][2][4][6]. Although the constituent proteins (such as CDK4, CDK6, CDK2, and Cyclin D/E/A/B, p53, RB) are well-recognized therapeutic targets, the “cell cycle regulation pathway” itself is a biological process or pathway, not a specific molecule, receptor, or individual therapeutic target[2][4][6][7]. Thus, it is an incorrect entry when an individual target is required for drug discovery or structured pharmacological data; the pathway comprises many potential druggable nodes rather than being a single entity that drugs or biomarkers can be directly assigned to. Potentially targetable proteins within this pathway include CDK4/6 (inhibited by approved drugs like palbociclib, ribociclib, and abemaciclib), CDK2, checkpoint kinases (ATM, CHK2), and tumor suppressors or regulators (e.g., p53, RB)[2][4][6]. Numerous small-molecule inhibitors have been developed or are in clinical investigation to modulate specific pathway components, mainly for the treatment of various cancers[2][6]. Safety concerns involving drugs targeting this pathway often include bone marrow suppression, neutropenia, and other cytotoxic effects due to effects on normal proliferating cells[2][6]. In summary, the cell cycle regulation pathway as a whole is a vital biological process—not a specific molecular target—regulating proliferation and genomic integrity in health and disease.

Other names

Cell cycle pathwayRegulation of cell cycleCell cycle control pathway

Inhibition of cyclin-dependent kinases (CDKs), Checkpoint kinase inhibition, Activation/inhibition of p53 pathway, DNA damage response modulation