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Microtubule Inhibitors

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Image	Description	Biochem/physiol Actions	CAS Number	Product #
	Colchicine ~95% (HPLC), powder	Antimitotic agent that disrupts microtubules by binding to tubulin and preventing its polymerization. Stimulates the intrinsic GTPase activity of tubulin. Induces apoptosis in several normal and tumor cell lines and activates the JNK/SAPK signaling pathway.	64-86-8	C9754
	Dolastatin 15 ≥95%		123884-00-4	D5566
	Nocodazole ≥99% (TLC), powder	Antimitotic agent that disrupts microtubules by binding to β‑tubulin and preventing formation of one of the two interchain disulfide linkages, thus inhibiting microtubule dynamics, disruption of mitotic spindle function, and fragmentation of the Golgi complex. Arrests the cell cycle at G₂/M phase. Prevents phosphorylation of the T cell antigen receptor and inhibits its activity. Stimulates the intrinsic GTPase activity of tubulin. Activates the JNK/SAPK signaling pathway and induces apoptosis in several normal and tumor cell lines.	31430-18-9	M1404
	Paclitaxel from Taxus brevifolia, ≥95% (HPLC), powder	Potent anti-neoplastic drug; binds to the N-terminal region of β-tubulin and promotes the formation of highly stable microtubules that resist depolymerization, thus preventing normal cell division and arresting the cell cycle at the G₂/M phase. The microtubule damage induces apoptosis through a JNK-dependent pathway in the early phase followed by a JNK-independent pathway, perhaps related to the activation of protein kinase A or of Raf-1 kinase, that results in phosphorylation of Bcl-2. Major metabolite in human liver microsome is 6α-hydroxypaclitaxel (6α-OHP). This enzymatic conversion can be used as a potential marker reaction for human CYP2C8.	33069-62-4	T7402
	Paclitaxel from Taxus yannanensis, powder	Potent anti-neoplastic drug; binds to the N-terminal region of β-tubulin and promotes the formation of highly stable microtubules that resist depolymerization, thus preventing normal cell division and arresting the cell cycle at the G₂/M phase. The microtubule damage induces apoptosis through a JNK-dependent pathway in the early phase followed by a JNK-independent pathway, perhaps related to the activation of protein kinase A or of Raf-1 kinase, that results in phosphorylation of Bcl-2. Major metabolite in human liver microsome is 6α-hydroxypaclitaxel (6α-OHP). This enzymatic conversion can be used as a potential marker reaction for human CYP2C8.	33069-62-4	T1912
	Paclitaxel from semisynthetic (from Taxus sp.), ≥97%	Potent anti-neoplastic drug; binds to the N-terminal region of β-tubulin and promotes the formation of highly stable microtubules that resist depolymerization, thus preventing normal cell division and arresting the cell cycle at the G₂/M phase. The microtubule damage induces apoptosis through a JNK-dependent pathway in the early phase followed by a JNK-independent pathway, perhaps related to the activation of protein kinase A or of Raf-1 kinase, that results in phosphorylation of Bcl-2. Major metabolite in human liver microsome is 6α-hydroxypaclitaxel (6α-OHP). This enzymatic conversion can be used as a potential marker reaction for human CYP2C8.	33069-62-4	T7191
	Podophyllotoxin ~98%	Inhibits microtubule assembly; antineoplastic.	518-28-5	P4405
	Rhizoxin from Rhizopus sp. >95% (HPLC)	An antitumor agent, rhizoxin is a 16-member ring lactone having an oxazole ring in its structure. This macrolide inhibits microtubule assembly and also depolymerizes pre-formed microtubles. Rhizoxin binds to β-tubulin in most eucaryotic cells including animals, plants and fungi. It completely prevents formation of an intrachain cross-link in β-tubulin by N,N'-ethylenebis(iodoacetamide). Due to its antimitotic activity it is used as an antitumor agent e.g., in human small cell lung cancer cell lines.	90996-54-6	R8149
	Vinblastine sulfate salt powder, ≥96% (HPLC)	Plant alkaloid that inhibits microtubule assembly by binding tubulin and inducing self-association in spiral aggregates in a reaction that appears to be regulated by the C-terminus of β-tubulin and is enhanced by GDP and GTP. Depolymerizes microtubules. Arrests the cell cycle in G2/M-phase by blocking mitotic spindle formation. Triggers Raf-1 activation, phosphorylation of bcl-2-family proteins, induction of p53 expression, and apoptosis in several tumor cell lines. Substrate of Pgp and CYP3A4.	143-67-9	V1377
	Vinorelbine ditartrate salt hydrate ≥98% (HPLC), powder	Vinorelbine is a potent anti-mitotic, anti-tumor agent. Vinorelbine inhibits microtubule assembly. Low neurotoxicity is related to its higher affinity for mitotic microtubules than for axonal microtubules.	125317-39-7 (anhydrous)	V2264

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