Amsacrine, DNA topoisomerase II inhibitor

Supplementary information

This supplementary information is collated from multiple sources and compiled automatically.

MTOR also known as mechanistic target of rapamycin acts as a central controller of cell growth and metabolism responding to nutrients growth factors and cellular energy status. mTOR is a large protein kinase with a mass of approximately 289 kDa. It primarily expresses in areas like the hypothalamus and in active proliferating cells. Topoisomerase II alpha weighing around 174 kDa manages DNA supercoiling and untangles DNA during replication. Its expression is notably higher in rapidly dividing cells which includes cancerous tissues. Interferon beta a cytokine modulates antiviral activity and immune response predominantly expressed in fibroblasts and immune cells. Mentionable too are the muscarinic acetylcholine receptor 1 (CHRM1) and dopamine receptor D1 involved in neurotransmission important to brain functions like memory and cognition. CHRM1 is abundant in the central nervous system while D1 is densely expressed in the striatum.

Biological function summary

MTOR forms part of two distinct complexes mTORC1 and mTORC2 both integral to protein synthesis and cell survival. mTORC1 senses nutritional signals driving anabolism and autophagy suppression whereas mTORC2 contributes to cytoskeletal organization and cell survival signaling. Topoisomerase II alpha facilitates DNA transcription and replication by controlling the topological states of DNA segments; it is not associated with a complex but works in coordination with other DNA repair proteins. Interferon beta engages the JAK-STAT signaling pathway impacting immune modulation and cell proliferation. Muscarinic acetylcholine receptor 1 initiates signaling cascades resulting in increased neuronal excitability while dopamine receptor D1 stimulates adenylyl cyclase activity affecting multiple processes including reward perception.

Pathways

MTOR integrates into the PI3K-AKT signaling pathway playing an important role in cellular growth and metabolism. It connects with AKT a protein kinases involved in pathways promoting cell survival. Topoisomerase II fits into the DNA replication pathway where it interacts with proteins such as DNA polymerase. Interferon beta occupies the JAK-STAT pathway interacting closely with JAK kinases to initiate transcriptional responses. CHRM1 linked to the MAPK/ERK pathway interacts with other receptor subtypes influencing synaptic plasticity. Dopamine receptor D1 is part of the cAMP signaling pathway modulating neuronal activity and interacting with phosphodiesterases.

Several targets play significant roles in cancer and neurological diseases. Mutations or dysregulation in mTOR pathways associate with cancers due to uncontrolled cell growth. Topoisomerase II alpha shows relevance to chemotherapy as inhibitors like amsacrine exploit its function to induce cell death in cancer cells. Interferon beta is important in managing multiple sclerosis by reducing inflammation and regulating immune responses. CHRM1 connected to Alzheimer's disease affects cholinergic signaling which is disrupted during disease progression. Dopamine receptor D1 implicated in Parkinson's disease interacts with other neurotransmitter systems influencing motor control.