chemistry

Ibrutinib

Ibrutinib 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 Ibrutinib rather than just read about it. In short: Ibrutinib, sold under the brand name Imbruvica among others, is a small molecule drug that inhibits B-cell proliferation and survival by irreversibly binding the protein Bruton's tyrosine kinase (BTK). Blocking BTK inhibits the B-cell receptor pathway, which is often aberrantly active in B cell cancers.

Key takeaways

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

Reference excerpt

Ibrutinib, sold under the brand name Imbruvica among others, is a small molecule drug that inhibits B-cell proliferation and survival by irreversibly binding the protein Bruton's tyrosine kinase (BTK). Blocking BTK inhibits the B-cell receptor pathway, which is often aberrantly active in B cell cancers. Ibrutinib is therefore used to treat such cancers, including mantle cell lymphoma, chronic lymphocytic leukemia, and Waldenström's macroglobulinemia. Ibrutinib also binds to C-terminal Src Kinases, which are off-target receptors for the BTK inhibitor. This binding inhibits the kinase from promoting cell differentiation and growth. Ibrutinib binds to these receptors and inhibits the kinase from promoting cell differentiation and growth. This leads to many different side effects like left atrial enlargement and atrial fibrillation during the treatment of Chronic Lymphocytic Leukemia. It is on the World Health Organization's List of Essential Medicines.

Medical uses Ibrutinib is indicated for the treatment of mantle cell lymphoma (MCL), chronic lymphocytic leukemia (CLL)/small lymphocytic lymphoma (SLL), Waldenström's macroglobulinemia (WM), marginal zone lymphoma (MZL), and chronic graft versus host disease (cGVHD).

Adverse effects Very common (>10% frequency) adverse effects include pneumonia, upper respiratory tract infection, sinusitis, skin infection, low neutrophil count, low platelet counts, headache, bleeding, bruising, diarrhea, vomiting, inflammation of mouth and lips, nausea, constipation, rash, joint pain, muscle spasms, musculoskeletal pain, fever, and edema. Common (1–10% frequency) adverse effects include sepsis, urinary tract infection, non-melanoma skin cancer (basal-cell carcinoma, squamous cell carcinoma), low leukocyte count, low lymphocyte count, interstitial lung disease, tumor lysis syndrome, high uric acid levels, dizziness, blurred vision, atrial fibrillation, subdural hematoma, nosebleeds, small bruises from broken blood vessels, high blood pressure, hives, and skin redness or blushing.

Pharmacology Ibrutinib oral bioavailability is 3.9% in a fasting state, 8.4% in a fed state, and 15.9% after consumption of grapefruit juice.

Mechanism Ibrutinib is a potent, irreversible inhibitor of Bruton's tyrosine kinase (BTK). The acrylamide group of ibrutinib forms a covalent bond with the cysteine residue C481 in the BTK active site, leading to sustained inhibition of BTK enzymatic activity. BTK is an important signalling molecule of the B-cell antigen receptor (BCR) pathway, which plays a role in the pathogenesis of several B-cell malignancies including mantle cell lymphoma (MCL), diffuse large B-cell lymphoma (DLBCL), follicular lymphoma, and chronic lymphocytic leukemia (CLL). Preclinical studies have shown that ibrutinib inhibits malignant B-cell proliferation and survival in vivo, and cell migration and substrate adhesion in vitro. In early clinical studies, the activity of ibrutinib has been described to include a rapid reduction in lymphadenopathy accompanied by a transient lymphocytosis, suggesting that the drug might have direct effects on cell homing or migration to factors in tissue microenvironments. In preclinical studies on chronic lymphocytic leukemia (CLL) cells, ibrutinib has been reported to promote apoptosis, inhibit proliferation, and also prevent CLL cells from responding to survival stimuli provided by the microenvironment. This also leads to a reduction of MCL1 levels (anti-apoptotic protein) in malignant B cells. Treatment of activated CLL cells with ibrutinib resulted in inhibition of BTK tyrosine phosphorylation and also effectively abrogated downstream survival pathways activated by this kinase including ERK1/2, PI3K, and NF-κB. Additionally, ibrutinib inhibited proliferation of CLL cells in vitro, effectively blocking survival signals provided externally to CLL cells from the microenvironment including soluble factors (BAFF, IL-6, IL-4, and TNF-α), fibronectin engagement and stromal cell contact. Ibrutinib has also been reported to reduce chronic lymphocytic leukemia cell chemotaxis towards the chemokines CXCL12 and CXCL13, and inhibit cellular adhesion following stimulation at the B-cell receptor (BCR). Additionally, ibrutinib down-modulates the expression of CD20 (target of rituximab/ofatumumab) by targeting the CXCR4/SDF1 axis. Together, these data are consistent with a mechanistic model whereby ibrutinib blocks BCR signaling, which drives cells into apoptosis and/or disrupts cell migration and adherence to protective tumour microenvironments.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Ibrutinib

Start with the simplest possible case. Write down what Ibrutinib 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 Ibrutinib 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 Ibrutinib 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 Ibrutinib

In research: Ibrutinib 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 Ibrutinib 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: Ibrutinib is common in secondary-school and first-year university syllabi. It links to neighbouring topics Acrylamides, Drugs developed by AbbVie, Drugs developed by Johnson & Johnson, so understanding it makes those chapters shorter.
In everyday life: Look for Ibrutinib 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 Ibrutinib in 20 minutes

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

Frequently asked questions

What is Ibrutinib in simple terms?

Why does Ibrutinib 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 Ibrutinib?

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 Ibrutinib.