chemistry

SB-221284

SB-221284 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 SB-221284 rather than just read about it. In short: SB-221284 is a selective serotonin 5-HT2C and 5-HT2B receptor antagonist which is used in scientific research. Its affinities (Ki) are 2.2 to 2.5 nM for the serotonin 5-HT2C receptor, 2.5 to 12.6 nM for the serotonin 5-HT2B receptor, and 398 to 550 nM for the serotonin 5-HT2A receptor (where it is also an antagonist).

Key takeaways

SB-221284 belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect SB-221284 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of SB-221284 from memory before moving on to harder problems.

Reference excerpt

SB-221284 is a selective serotonin 5-HT2C and 5-HT2B receptor antagonist which is used in scientific research. Its affinities (Ki) are 2.2 to 2.5 nM for the serotonin 5-HT2C receptor, 2.5 to 12.6 nM for the serotonin 5-HT2B receptor, and 398 to 550 nM for the serotonin 5-HT2A receptor (where it is also an antagonist). The drug has 160- to 250-fold selectivity for the serotonin 5-HT2C receptor over the serotonin 5-HT2A receptor. It is said to have been the first serotonin 5-HT2C receptor ligand to show 100-fold selectivity over the serotonin 5-HT2A receptor. SB-221284 has shown anxiolytic-like effects in animals. Conversely, it has been said to be inactive in terms of antidepressant-like, antiobsessional-like, antipanic-like, and sedative effects. It also showed no proconvulsant or hyperphagic effects in animals, phenotypes that are notably observed with serotonin 5-HT2C receptor knockout. The preferential serotonin 5-HT2C receptor agonist meta-chlorophenylpiperazine (mCPP) and the serotonin reuptake inhibitor fluoxetine have been found to acutely reduce social interaction in rodents. SB-221284 was found to reverse the acute decreases in social interaction produced by mCPP and fluoxetine. The drug has also been found to block mCPP-induced hypolocomotion. Both SB-221284 and the selective serotonin 5-HT2C receptor antagonist SB-242084 have been found to enhance the nucleus accumbens dopamine release and hyperlocomotion induced by NMDA receptor antagonists like phencyclidine (PCP) and dizocilpine (MK-801). Conversely, both drugs had no effect on locomotor activity or dopamine release in the nucleus accumbens by themselves. However, another study reported that SB-221284 by itself did enhance locomotion. SB-221284 was first described in the scientific literature by 1996. It was researched by GlaxoSmithKline as a possible non-sedating anxiolytic and reached the preclinical research stage of development. However, it was found to be a potent inhibitor of a number of human cytochrome P450 enzymes (particularly CYP1A2), which precluded further development of the drug. Other sources have stated that SB-221284 was not further developed due to "toxicity" and that other drugs were pursued instead as SB-221284 was a "fairly weak" serotonin 5-HT2C receptor antagonist.

References

Illustrations

Worked examples

Example 1 — a first encounter with SB-221284

Start with the simplest possible case. Write down what SB-221284 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 SB-221284 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 SB-221284 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 SB-221284

In research: SB-221284 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 SB-221284 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: SB-221284 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 3-Pyridyl compounds, 5-HT2B antagonists, 5-HT2C antagonists, so understanding it makes those chapters shorter.
In everyday life: Look for SB-221284 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 SB-221284 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what SB-221284 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 SB-221284 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is SB-221284 in simple terms?

Why does SB-221284 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 SB-221284?

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 SB-221284.