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chemistry

Tipifarnib

Tipifarnib is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Tipifarnib rather than just read about it. In short: Tipifarnib (INN, proposed trade name Zarnestra) is a farnesyltransferase inhibitor. Farnesyltransferase inhibitors block the activity of the farnesyltransferase enzyme by inhibiting prenylation of the CAAX tail motif, which ultimately prevents Ras from binding to the membrane, rendering it inactive.

Tipifarnib — main illustration
Tipifarnib — illustration

Key takeaways

  • Tipifarnib belongs to chemistry; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Tipifarnib to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Tipifarnib from memory before moving on to harder problems.

Reference excerpt

Tipifarnib (INN, proposed trade name Zarnestra) is a farnesyltransferase inhibitor. Farnesyltransferase inhibitors block the activity of the farnesyltransferase enzyme by inhibiting prenylation of the CAAX tail motif, which ultimately prevents Ras from binding to the membrane, rendering it inactive.

History The compound was discovered by Johnson & Johnson Pharmaceutical Research & Development, L.L.C, with registration number R115777. For treatment of progressive plexiform neurofibromas associated with neurofibromatosis type I, it passed phase I clinical trials but was suspended (NCT00029354) in phase II. Tipifarnib was submitted to the FDA by Johnson & Johnson for the treatment of AML in patients aged 65 and over with a new drug application (NDA) to the FDA on January 24, 2005. In June 2005, the FDA issued a "not approvable" letter for tipifarnib. Kura Oncology in-licensed tipifarnib from Janssen in 2014.

Investigations

Cancer The inhibitor is being investigated in patients with HRAS mutant head and neck cancer, peripheral T-cell lymphoma (PTCL), myelodysplastic syndromes (MDS), and chronic myelomonocytic leukemia (CMML). It was previously tested in clinical trials in patients in certain stages of breast cancer. It was also investigated as a treatment for multiple myeloma.

Progeria

It was shown on a mouse model of Hutchinson–Gilford progeria syndrome that dose-dependent administration of tipifarnib can significantly prevent both the onset of the cardiovascular phenotype as well as the late progression of existing cardiovascular disease.

References

Illustrations

Tipifarnib illustration
Tipifarnib: Confocal microscopy photographs of the descending aortas of two 15-month-old progeria mice, one untreated (left picture) and the other treated with the farnsyltransferase inhibitor drug tipifarnib (right picture). The microphotographs show prevention of the vascular smooth muscle cell loss that is otherwise rampant by this age. Staining was smooth muscle alpha-actin (green), lamins A/C (red) and DAPI (blue). (Original magnification, ×40)
Confocal microscopy photographs of the descending aortas of two 15-month-old progeria mice, one untreated (left picture) and the other treated with the farnsyltransferase inhibitor drug tipifarnib (right picture). The microphotographs show prevention of the vascular smooth muscle cell loss that is otherwise rampant by this age. Staining was smooth muscle alpha-actin (green), lamins A/C (red) and DAPI (blue). (Original magnification, ×40)

Worked examples

Example 1 — a first encounter with Tipifarnib

Start with the simplest possible case. Write down what Tipifarnib claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Tipifarnib before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Tipifarnib ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Tipifarnib

In research
Tipifarnib appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Tipifarnib in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Tipifarnib is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2-Quinolones, 3-Chlorophenyl compounds, 4-Chlorophenyl compounds, so understanding it makes those chapters shorter.
In everyday life
Look for Tipifarnib outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Tipifarnib in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Tipifarnib means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Tipifarnib out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Tipifarnib in simple terms?

Tipifarnib (INN, proposed trade name Zarnestra) is a farnesyltransferase inhibitor. Farnesyltransferase inhibitors block the activity of the farnesyltransferase enzyme by inhibiting prenylation of the CAAX tail motif, which ultimately prevents Ras from binding to the membrane, rendering it inactive.

Why does Tipifarnib matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Tipifarnib?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Tipifarnib.

Tags

  • 2-Quinolones
  • 3-Chlorophenyl compounds
  • 4-Chlorophenyl compounds
  • Drugs not assigned an ATC code
  • Experimental monoclonal antibodies
  • Farnesyltransferase inhibitors
  • Imidazoles
  • Orphan drugs

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