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Vinflunine is a novel fluorinated vinca alkaloid currently in Phase II clinical trials, which in preclinical studies exhibited superior antitumor activity to vinorelbine and vinblastine. Vinflunine block mitosis at the metaphase/anaphase transition, leading to apoptosis. [25]
Vinblastine is a vinca alkaloid [10] [3] [11] and a chemical analogue of vincristine. [12] [13] It binds tubulin, thereby inhibiting the assembly of microtubules. [14]Vinblastine treatment causes M phase specific cell cycle arrest by disrupting microtubule assembly and proper formation of the mitotic spindle and the kinetochore, each of which are necessary for the separation of chromosomes ...
Cytoskeletal drugs are small molecules that interact with actin or tubulin.These drugs can act on the cytoskeletal components within a cell in three main ways. Some cytoskeletal drugs stabilize a component of the cytoskeleton, such as taxol, which stabilizes microtubules, or Phalloidin, which stabilizes actin filaments.
The Madagascan periwinkle Catharanthus roseus L. is the source for a number of important natural products, [1] including catharanthine and vindoline [2] and the vinca alkaloids it produces from them: leurosine and the chemotherapy agents vinblastine [3] and vincristine, [4] all of which can be obtained from the plant.
The main side effects of vincristine are chemotherapy-induced peripheral neuropathy, hyponatremia, constipation, and hair loss. Vincristine-induced neuropathy is the main dose-limiting side effect. [9] Chemotherapy-induced peripheral neuropathy can be severe, and may be a reason to reduce or avoid using vincristine.
Demecolcine is a microtubule-depolymerizing drug like vinblastine. It acts by two distinct mechanisms. At very low concentration it binds to microtubule plus end to suppress microtubule dynamics. [3] Recent study has found at higher concentration demecolcine can promote microtubule detachment from microtubule organizing center.
The U.S. Department of Agriculture on Tuesday acknowledged it accidentally fired "several" employees to combat the bird flu and is working to rehire them.
The interaction between the two types of loops is evident in mitosis. While positive feedback initiates mitosis, a negative feedback loop promotes the inactivation of the cyclin-dependent kinases by the anaphase-promoting complex. This example clearly shows the combined effects that positive and negative feedback loops have on cell-cycle ...