chemistry

Losmapimod

Losmapimod 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 Losmapimod rather than just read about it. In short: Losmapimod (GW856553X) is an investigational drug that reached stage III clinical trials for multiple medical conditions, but did not prove efficacy. It was most recently in development by Fulcrum Therapeutics for the treatment of facioscapulohumeral muscular dystrophy (FSHD).

Key takeaways

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

Reference excerpt

Losmapimod (GW856553X) is an investigational drug that reached stage III clinical trials for multiple medical conditions, but did not prove efficacy. It was most recently in development by Fulcrum Therapeutics for the treatment of facioscapulohumeral muscular dystrophy (FSHD). Losmapimod selectively inhibits enzymes p38α/β mitogen-activated protein kinases (MAPKs), which are modulators of DUX4 expression and mediators of inflammation.

Historical Investigations Losmapimod was discovered and unsuccessfully developed by GSK for treating multiple medical conditions. Despite failing to prove efficacy, GSK clinical trials showed that losmapimod is generally well tolerated across more than 3,500 subjects. GSK investigated losmapimod as a therapeutic for patients post-myocardial infarction (heart attack). Despite phase II clinical trials the phase IIIA clinical trial (LATITUDE) failed to show significantly improved clinical outcomes. In October 2015 GSK announced cancelling the planned phase IIIB trial, but would "evaluate all options for future development." GSK investigated losmapimod as a therapeutic for COPD, but multiple phase II clinical trials failed to show that losmapimod improves exercise tolerance, lung function, arterial inflammation, endothelial function, or rate of COPD exacerbations in subjects with COPD. GSK terminated development of losmapimod for COPD in 2016. GSK investigated losmapimod as a therapeutic for major depressive disorder (MDD) on the basis of depression being correlated with elevated pro-inflammatory cytokines. Phase II clinical trials failed to show a significant improvement in depression symptoms and biomarkers. In 2019 Fulcrum therapeutics acquired from GSK the rights to losmapimod. Fulcrum identified p38α/β MAPK inhibitors as potent suppressors of DUX4 expression, the de-suppression of which is accepted as the cause FSHD, and then chose to develop losmapimod for FSHD due to "substantial and attractive preclinical and clinical data" from previous GlaxoSmithKline (GSK) clinical trials. Although a 2021 phase IIb clinical trial showed slowing of muscle deterioration, a 2024 phase III clinical trial failed to demonstrate efficacy.

References

Illustrations

Worked examples

Example 1 — a first encounter with Losmapimod

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

In research: Losmapimod 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 Losmapimod 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: Losmapimod is common in secondary-school and first-year university syllabi. It links to neighbouring topics Disubstituted pyridines, Neopentyl compounds, Orphan drugs, so understanding it makes those chapters shorter.
In everyday life: Look for Losmapimod 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 Losmapimod in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Losmapimod 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 Losmapimod out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Losmapimod in simple terms?

Why does Losmapimod 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 Losmapimod?

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 Losmapimod.