Component
Polymerisation of tubulin into microtubules
Polymerisation of tubulin into microtubules. Species, exposure and limitations are retained in each linked claim.
6 recorded relationships. Experimental role, claim status and evidence remain attached to each record.
How nutrients influence it
Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.
Other things that act on it
Enzymes, hormones, genes, and other components with a recorded effect. These are not nutrients, so they do not count toward the arrows above. Each finding names the chapter that recorded it.
How nutrients reach it in more than one step
Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.
Tracing routes…
What it does
Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.
What acts on it
Colchicine and a range of anthelmintic benzimidazoles inhibited in vitro polymerisation of tubulin purified from Ascaridia galli more than that purified from mammalian tissue, with oxfendazole and thiabendazole having virtually no effect on mammalian tubulin assembly while both inhibited nematode tubulin, and electron microscopy revealed no morphological differences between microtubules polymerised with or without drug although their length and number were reduced.
Experimental context and source evidence
- evidence_span
- {"source_cache": "artifacts/mebendazole-research/6712717.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "dc6664076b62c0da221cce8e34690f297828b832da76857a2cc12cf9769fb282", "start_char": 0, "end_char": 949, "text_sha256": "dc6664076b62c0da221cce8e34690f297828b832da76857a2cc12cf9769fb282"}
- experimental_model
- In vitro polymerisation of tubulin purified from Ascaridia galli and from mammalian tissue, with electron microscopy
- exposure
- Colchicine and a range of anthelmintic benzimidazoles on both tubulins
- limitations
- Adds electron microscopy, which shows the drug reduces the number and length of microtubules without making abnormal ones. Purified protein rather than intact parasite.
- nutrient_topic
- Mebendazole research collection; topical membership is not evidence of a direct clinical effect, and mebendazole is recorded separately from albendazole, from the benzimidazole class and from its own crystal forms. · Mebendazole
- organism
- Nematode and mammal
- plain_language
- The microtubules that do form look normal; there are simply fewer and shorter ones.
- primary_references
- [mbz-p6712717] A comparison of the interaction of anthelmintic benzimidazoles with tubulin isolated from mammalian tissue and the parasitic nematode Ascaridia galli. (1984). https://pubmed.ncbi.nlm.nih.gov/6712717/ DOI: 10.1016/0006-2952(84)90515-x
- tissue_or_cell_type
- Purified tubulin
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · In vitro polymerisation of tubulin purified from Ascaridia galli and from mammalian tissue, with electron microscopy · source_derived_draft · unverified_draft
### mbz-fewer-not-abnormal Colchicine and a range of anthelmintic benzimidazoles inhibited in vitro polymerisation of tubulin purified from Ascaridia galli more than that purified from mammalian tissue, with oxfendazole and thiabendazole having virtually no effect on mammalian tubulin assembly while both inhibited nematode tubulin, and electron microscopy revealed no morphological differences between microtubules polymerised with or without drug although their length and number were reduced. Condition category: normal nutrient_topic: Mebendazole research collection; topical membership is not evidence of a direct clinical effect, and mebendazole is recorded separately from albendazole, from the benzimidazole class and from its own crystal forms. plain_language: The microtubules that do form look normal; there are simply fewer and shorter ones. organism: Nematode and mammal tissue_or_cell_type: Purified tubulin experimental_model: In vitro polymerisation of tubulin purified from Ascaridia galli and from mammalian tissue, with electron microscopy limitations: Adds electron microscopy, which shows the drug reduces the number and length of microtubules without making abnormal ones. Purified protein rather than intact parasite. exposure: Colchicine and a range of anthelmintic benzimidazoles on both tubulins evidence_span: {"source_cache": "artifacts/mebendazole-research/6712717.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "dc6664076b62c0da221cce8e34690f297828b832da76857a2cc12cf9769fb282", "start_char": 0, "end_char": 949, "text_sha256": "dc6664076b62c0da221cce8e34690f297828b832da76857a2cc12cf9769fb282"} [mbz-p6712717] A comparison of the interaction of anthelmintic benzimidazoles with tubulin isolated from mammalian tissue and the parasitic nematode Ascaridia galli. (1984). https://pubmed.ncbi.nlm.nih.gov/6712717/ DOI: 10.1016/0006-2952(84)90515-x
Complete structured claim and evidenceMedian inhibitory concentrations for nocodazole, oxibendazole, parbendazole, mebendazole and fenbendazole against bovine brain tubulin polymerisation ranged from 1.97 x 10-6 to 6.32 x 10-6 molar, while benomyl, cambendazole and carbendazim had values from 5.83 x 10-5 to 9.01 x 10-5 molar and thiabendazole had a value of 5.49 x 10-4 molar.
Experimental context and source evidence
- evidence_span
- {"source_cache": "artifacts/mebendazole-research/728472.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "544c36409218c93ebff76d932a2bc6e14ccf7fd6e217d4614c4b561281c2555a", "start_char": 0, "end_char": 1025, "text_sha256": "544c36409218c93ebff76d932a2bc6e14ccf7fd6e217d4614c4b561281c2555a"}
- experimental_model
- Turbidimetric microtubule polymerisation assay and colchicine binding assay on purified bovine brain tubulin
- exposure
- Eleven benzimidazoles compared for inhibition of the initial rate of microtubule polymerisation
- limitations
- Purified mammalian tubulin, which is the off-target rather than the parasite target. It fixes where mebendazole sits in the class by potency.
- nutrient_topic
- Mebendazole research collection; topical membership is not evidence of a direct clinical effect, and mebendazole is recorded separately from albendazole, from the benzimidazole class and from its own crystal forms. · Mebendazole
- organism
- Cattle
- plain_language
- Mebendazole sits in the potent group; thiabendazole is about a hundred times weaker.
- primary_references
- [mbz-p728472] Interaction of anthelmintic benzimidazoles and benzimidazole derivatives with bovine brain tubulin. (1978). https://pubmed.ncbi.nlm.nih.gov/728472/ DOI: 10.1016/0304-4165(78)90334-3
- tissue_or_cell_type
- Brain tubulin
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Turbidimetric microtubule polymerisation assay and colchicine binding assay on purified bovine brain tubulin · source_derived_draft · unverified_draft
### mbz-inhibits-polymerisation Median inhibitory concentrations for nocodazole, oxibendazole, parbendazole, mebendazole and fenbendazole against bovine brain tubulin polymerisation ranged from 1.97 x 10-6 to 6.32 x 10-6 molar, while benomyl, cambendazole and carbendazim had values from 5.83 x 10-5 to 9.01 x 10-5 molar and thiabendazole had a value of 5.49 x 10-4 molar. Condition category: normal nutrient_topic: Mebendazole research collection; topical membership is not evidence of a direct clinical effect, and mebendazole is recorded separately from albendazole, from the benzimidazole class and from its own crystal forms. plain_language: Mebendazole sits in the potent group; thiabendazole is about a hundred times weaker. organism: Cattle tissue_or_cell_type: Brain tubulin experimental_model: Turbidimetric microtubule polymerisation assay and colchicine binding assay on purified bovine brain tubulin limitations: Purified mammalian tubulin, which is the off-target rather than the parasite target. It fixes where mebendazole sits in the class by potency. exposure: Eleven benzimidazoles compared for inhibition of the initial rate of microtubule polymerisation evidence_span: {"source_cache": "artifacts/mebendazole-research/728472.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "544c36409218c93ebff76d932a2bc6e14ccf7fd6e217d4614c4b561281c2555a", "start_char": 0, "end_char": 1025, "text_sha256": "544c36409218c93ebff76d932a2bc6e14ccf7fd6e217d4614c4b561281c2555a"} [mbz-p728472] Interaction of anthelmintic benzimidazoles and benzimidazole derivatives with bovine brain tubulin. (1978). https://pubmed.ncbi.nlm.nih.gov/728472/ DOI: 10.1016/0304-4165(78)90334-3
Complete structured claim and evidenceAcross thirty-two methyl benzimidazol-2-yl carbamates, the size or some colinear physico-chemical characteristic of the substituent in the 5 or 6 position had a profound effect on potency against mammalian tubulin polymerisation, and branching with or without a commensurate increase in polarity adjacent to the benzimidazole ring resulted in a loss of activity.
Experimental context and source evidence
- evidence_span
- {"source_cache": "artifacts/mebendazole-research/3985991.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "9b881308a6051bd89e2f8323670dd08a8d5e50cf06c7705724ece611440643e5", "start_char": 0, "end_char": 680, "text_sha256": "9b881308a6051bd89e2f8323670dd08a8d5e50cf06c7705724ece611440643e5"}
- experimental_model
- Structure-activity study of thirty-two methyl benzimidazol-2-yl carbamates against mammalian tubulin polymerisation
- exposure
- Systematic variation of the 5(6)-position substituent
- limitations
- Quantitative structure-activity modelling on the off-target protein. It says which part of the molecule matters, not which target matters.
- nutrient_topic
- Mebendazole research collection; topical membership is not evidence of a direct clinical effect, and mebendazole is recorded separately from albendazole, from the benzimidazole class and from its own crystal forms. · Mebendazole
- organism
- Mammal
- plain_language
- One position on the ring decides how well the whole family works.
- primary_references
- [mbz-p3985991] Structure-activity relationships of benzimidazole carbamates as inhibitors of mammalian tubulin, in vitro. (1985). https://pubmed.ncbi.nlm.nih.gov/3985991/ DOI: 10.1016/0006-2952(85)90611-2
- tissue_or_cell_type
- Tubulin
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Structure-activity study of thirty-two methyl benzimidazol-2-yl carbamates against mammalian tubulin polymerisation · source_derived_draft · unverified_draft
### mbz-the-5-substituent-governs Across thirty-two methyl benzimidazol-2-yl carbamates, the size or some colinear physico-chemical characteristic of the substituent in the 5 or 6 position had a profound effect on potency against mammalian tubulin polymerisation, and branching with or without a commensurate increase in polarity adjacent to the benzimidazole ring resulted in a loss of activity. Condition category: normal nutrient_topic: Mebendazole research collection; topical membership is not evidence of a direct clinical effect, and mebendazole is recorded separately from albendazole, from the benzimidazole class and from its own crystal forms. plain_language: One position on the ring decides how well the whole family works. organism: Mammal tissue_or_cell_type: Tubulin experimental_model: Structure-activity study of thirty-two methyl benzimidazol-2-yl carbamates against mammalian tubulin polymerisation limitations: Quantitative structure-activity modelling on the off-target protein. It says which part of the molecule matters, not which target matters. exposure: Systematic variation of the 5(6)-position substituent evidence_span: {"source_cache": "artifacts/mebendazole-research/3985991.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "9b881308a6051bd89e2f8323670dd08a8d5e50cf06c7705724ece611440643e5", "start_char": 0, "end_char": 680, "text_sha256": "9b881308a6051bd89e2f8323670dd08a8d5e50cf06c7705724ece611440643e5"} [mbz-p3985991] Structure-activity relationships of benzimidazole carbamates as inhibitors of mammalian tubulin, in vitro. (1985). https://pubmed.ncbi.nlm.nih.gov/3985991/ DOI: 10.1016/0006-2952(85)90611-2
Complete structured claim and evidence
Where it participates (unsigned role)
Benzimidazole carbamates with strong inhibitory activity against mammalian tubulin were potent inhibitors of Haemonchus contortus egg hatch while non-inhibitors failed to prevent hatching, supporting the view that the primary mode of action of these drugs on nematode eggs is inhibition of microtubule-dependent processes within the developing egg.
Experimental context and source evidence
- evidence_span
- {"source_cache": "artifacts/mebendazole-research/3564338.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "89495a42e9f41cac9010e20e925b802c27fde1dfac9a4a24dd2236335f4d61b1", "start_char": 0, "end_char": 818, "text_sha256": "89495a42e9f41cac9010e20e925b802c27fde1dfac9a4a24dd2236335f4d61b1"}
- experimental_model
- Correlation of Haemonchus contortus egg hatch inhibition with inhibition of mammalian tubulin polymerisation
- exposure
- Benzimidazole carbamates tested in both assays
- limitations
- A correlation rather than a demonstration of mechanism in the egg, and the hatch assay was sensitive to co-solvent concentration and incubation time.
- nutrient_topic
- Mebendazole research collection; topical membership is not evidence of a direct clinical effect, and mebendazole is recorded separately from albendazole, from the benzimidazole class and from its own crystal forms. · Mebendazole
- organism
- Nematode and mammal
- plain_language
- The compounds that block tubulin are the ones that stop eggs hatching, and the ones that do not, do not.
- primary_references
- [mbz-p3564338] Comparison of inhibition of polymerisation of mammalian tubulin and helminth ovicidal activity by benzimidazole carbamates. (1987). https://pubmed.ncbi.nlm.nih.gov/3564338/ DOI: 10.1016/0304-4017(87)90029-x
- tissue_or_cell_type
- Nematode eggs and mammalian tubulin
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Correlation of Haemonchus contortus egg hatch inhibition with inhibition of mammalian tubulin polymerisation · source_derived_draft · unverified_draft
### mbz-egg-hatch-tracks-tubulin Benzimidazole carbamates with strong inhibitory activity against mammalian tubulin were potent inhibitors of Haemonchus contortus egg hatch while non-inhibitors failed to prevent hatching, supporting the view that the primary mode of action of these drugs on nematode eggs is inhibition of microtubule-dependent processes within the developing egg. Condition category: normal nutrient_topic: Mebendazole research collection; topical membership is not evidence of a direct clinical effect, and mebendazole is recorded separately from albendazole, from the benzimidazole class and from its own crystal forms. plain_language: The compounds that block tubulin are the ones that stop eggs hatching, and the ones that do not, do not. organism: Nematode and mammal tissue_or_cell_type: Nematode eggs and mammalian tubulin experimental_model: Correlation of Haemonchus contortus egg hatch inhibition with inhibition of mammalian tubulin polymerisation limitations: A correlation rather than a demonstration of mechanism in the egg, and the hatch assay was sensitive to co-solvent concentration and incubation time. exposure: Benzimidazole carbamates tested in both assays evidence_span: {"source_cache": "artifacts/mebendazole-research/3564338.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "89495a42e9f41cac9010e20e925b802c27fde1dfac9a4a24dd2236335f4d61b1", "start_char": 0, "end_char": 818, "text_sha256": "89495a42e9f41cac9010e20e925b802c27fde1dfac9a4a24dd2236335f4d61b1"} [mbz-p3564338] Comparison of inhibition of polymerisation of mammalian tubulin and helminth ovicidal activity by benzimidazole carbamates. (1987). https://pubmed.ncbi.nlm.nih.gov/3564338/ DOI: 10.1016/0304-4017(87)90029-x
Complete structured claim and evidenceIn glioblastoma cell lines mebendazole displayed cytotoxicity with half-maximal inhibitory concentrations ranging from 0.1 to 0.3 micromolar, disrupted microtubule formation in those cells with in vitro activity correlated with reduced tubulin polymerization, and significantly extended mean survival by up to 63% in syngeneic and xenograft orthotopic mouse glioma models; the programme began with the serendipitous observation that fenbendazole, used to treat pinworm infection, inhibited brain tumour engraftment.
Experimental context and source evidence
- evidence_span
- {"source_cache": "artifacts/mebendazole-research/21764822.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "31b328d5c2340f7a4e9b6a3b3d46c68a8c0265c50d483375bc6dc15bb1696ad6", "start_char": 0, "end_char": 1210, "text_sha256": "31b328d5c2340f7a4e9b6a3b3d46c68a8c0265c50d483375bc6dc15bb1696ad6"}
- experimental_model
- Cell line cytotoxicity, tubulin polymerisation and syngeneic and xenograft orthotopic mouse glioma models
- exposure
- Mebendazole compared with fenbendazole, at doses documented as safe in humans
- limitations
- The observation that started the programme was serendipitous, from pinworm treatment of laboratory animals. Mouse models, and the survival gain is a mean rather than a cure.
- nutrient_topic
- Mebendazole research collection; topical membership is not evidence of a direct clinical effect, and mebendazole is recorded separately from albendazole, from the benzimidazole class and from its own crystal forms. · Mebendazole
- organism
- Human cells and mouse
- plain_language
- The worm drug killed brain tumour cells at low concentrations and let mice live substantially longer.
- primary_references
- [mbz-p21764822] Antiparasitic mebendazole shows survival benefit in 2 preclinical models of glioblastoma multiforme. (2011). https://pubmed.ncbi.nlm.nih.gov/21764822/ DOI: 10.1093/neuonc/nor077
- tissue_or_cell_type
- Glioblastoma
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Cell line cytotoxicity, tubulin polymerisation and syngeneic and xenograft orthotopic mouse glioma models · source_derived_draft · unverified_draft
### mbz-glioma-cytotoxicity In glioblastoma cell lines mebendazole displayed cytotoxicity with half-maximal inhibitory concentrations ranging from 0.1 to 0.3 micromolar, disrupted microtubule formation in those cells with in vitro activity correlated with reduced tubulin polymerization, and significantly extended mean survival by up to 63% in syngeneic and xenograft orthotopic mouse glioma models; the programme began with the serendipitous observation that fenbendazole, used to treat pinworm infection, inhibited brain tumour engraftment. Condition category: normal nutrient_topic: Mebendazole research collection; topical membership is not evidence of a direct clinical effect, and mebendazole is recorded separately from albendazole, from the benzimidazole class and from its own crystal forms. plain_language: The worm drug killed brain tumour cells at low concentrations and let mice live substantially longer. organism: Human cells and mouse tissue_or_cell_type: Glioblastoma experimental_model: Cell line cytotoxicity, tubulin polymerisation and syngeneic and xenograft orthotopic mouse glioma models limitations: The observation that started the programme was serendipitous, from pinworm treatment of laboratory animals. Mouse models, and the survival gain is a mean rather than a cure. exposure: Mebendazole compared with fenbendazole, at doses documented as safe in humans evidence_span: {"source_cache": "artifacts/mebendazole-research/21764822.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "31b328d5c2340f7a4e9b6a3b3d46c68a8c0265c50d483375bc6dc15bb1696ad6", "start_char": 0, "end_char": 1210, "text_sha256": "31b328d5c2340f7a4e9b6a3b3d46c68a8c0265c50d483375bc6dc15bb1696ad6"} [mbz-p21764822] Antiparasitic mebendazole shows survival benefit in 2 preclinical models of glioblastoma multiforme. (2011). https://pubmed.ncbi.nlm.nih.gov/21764822/ DOI: 10.1093/neuonc/nor077
Complete structured claim and evidenceThe effective concentrations of mebendazole to inhibit GL261 glioblastoma cell viability, microtubule polymerization and metaphase arrest were very similar, and using mebendazole as a seed for the NCI COMPARE program revealed that the top-scoring drugs were highly enriched in microtubule-targeting drugs, indicating that the cell toxicity of mebendazole is indeed caused by inhibiting microtubule formation.
Experimental context and source evidence
- evidence_span
- {"source_cache": "artifacts/mebendazole-research/28386621.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "20ef610d6b4a341f8a0a3f731bbea5477badbee517062c303bbf1075f3a29865", "start_char": 0, "end_char": 1788, "text_sha256": "20ef610d6b4a341f8a0a3f731bbea5477badbee517062c303bbf1075f3a29865"}
- experimental_model
- Concentration-matched comparison of viability, microtubule polymerisation and metaphase arrest, with NCI COMPARE analysis and a head-to-head animal comparison against vincristine
- exposure
- Mebendazole against vincristine close to its maximum tolerated dose in orthotopic GL261 tumours
- limitations
- Tests whether the anticancer effect is the microtubule effect by matching concentrations across three assays, which most repurposing studies do not do.
- nutrient_topic
- Mebendazole research collection; topical membership is not evidence of a direct clinical effect, and mebendazole is recorded separately from albendazole, from the benzimidazole class and from its own crystal forms. · Mebendazole
- organism
- Mouse
- plain_language
- The concentration that kills the cell is the concentration that blocks its microtubules, so it is the same mechanism.
- primary_references
- [mbz-p28386621] Repurposing Mebendazole as a Replacement for Vincristine for the Treatment of Brain Tumors. (2017). https://pubmed.ncbi.nlm.nih.gov/28386621/ DOI: 10.2119/molmed.2017.00011
- tissue_or_cell_type
- Glioblastoma
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Concentration-matched comparison of viability, microtubule polymerisation and metaphase arrest, with NCI COMPARE analysis and a head-to-head animal comparison against vincristine · source_derived_draft · unverified_draft
### mbz-the-anticancer-effect-is-tubulin The effective concentrations of mebendazole to inhibit GL261 glioblastoma cell viability, microtubule polymerization and metaphase arrest were very similar, and using mebendazole as a seed for the NCI COMPARE program revealed that the top-scoring drugs were highly enriched in microtubule-targeting drugs, indicating that the cell toxicity of mebendazole is indeed caused by inhibiting microtubule formation. Condition category: normal nutrient_topic: Mebendazole research collection; topical membership is not evidence of a direct clinical effect, and mebendazole is recorded separately from albendazole, from the benzimidazole class and from its own crystal forms. plain_language: The concentration that kills the cell is the concentration that blocks its microtubules, so it is the same mechanism. organism: Mouse tissue_or_cell_type: Glioblastoma experimental_model: Concentration-matched comparison of viability, microtubule polymerisation and metaphase arrest, with NCI COMPARE analysis and a head-to-head animal comparison against vincristine limitations: Tests whether the anticancer effect is the microtubule effect by matching concentrations across three assays, which most repurposing studies do not do. exposure: Mebendazole against vincristine close to its maximum tolerated dose in orthotopic GL261 tumours evidence_span: {"source_cache": "artifacts/mebendazole-research/28386621.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "20ef610d6b4a341f8a0a3f731bbea5477badbee517062c303bbf1075f3a29865", "start_char": 0, "end_char": 1788, "text_sha256": "20ef610d6b4a341f8a0a3f731bbea5477badbee517062c303bbf1075f3a29865"} [mbz-p28386621] Repurposing Mebendazole as a Replacement for Vincristine for the Treatment of Brain Tumors. (2017). https://pubmed.ncbi.nlm.nih.gov/28386621/ DOI: 10.2119/molmed.2017.00011
Complete structured claim and evidence
The events it takes part in
A mechanism often involves more than two components. These are the full events, with every participant and its role.
Situations it appears in
Low-supply and faulty-machinery situations recorded in the chapters where this component plays a part.
In the sources
Preserved passages that mention this component, quoted exactly. Open one to read it in context.
Open hypotheses
Proposed ideas that involve this component. They are labeled as hypotheses and do not change any recorded statement.
This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.