chemistry

PNU-99,194

PNU-99,194 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 PNU-99,194 rather than just read about it. In short: PNU-99,194(A) (or U-99,194(A)) is a drug of the 2-aminoindane family which acts as a moderately selective D3 receptor antagonist with ~15-30-fold preference for D3 over the D2 subtype. Though it has substantially greater preference for D3 over D2, the latter receptor does still play some role in its effects, as evidenced by the fact that PNU-99,194 weakly stimulates both prolactin secretion and striatal dopamine syn…

Key takeaways

PNU-99,194 belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect PNU-99,194 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PNU-99,194 from memory before moving on to harder problems.

Reference excerpt

PNU-99,194(A) (or U-99,194(A)) is a drug of the 2-aminoindane family which acts as a moderately selective D3 receptor antagonist with ~15-30-fold preference for D3 over the D2 subtype. Though it has substantially greater preference for D3 over D2, the latter receptor does still play some role in its effects, as evidenced by the fact that PNU-99,194 weakly stimulates both prolactin secretion and striatal dopamine synthesis, actions it does not share with the more selective (100-fold) D3 receptor antagonists S-14,297 and GR-103,691. In rodent studies, low doses of PNU-99,194 produce conditioned place preference (CPP) with no effect on intracranial self-stimulation (ICSS), whereas low doses of D3 agonists like 7-OH-DPAT inhibit ICSS behavior and cause conditioned place aversion (CPA). In contrast, high doses of PNU-99,194 produce CPA and inhibit ICSS, while high doses of 7-OH-DPAT result in the opposite. Paralleling this, low doses of PNU-99,194 and 7-OH-DPAT induce hyperactivity and hypoactivity, respectively, whereas the inverse is seen at high doses with both agents. These data indicate that the D3 receptor has biphasic effects on reward mechanisms and locomotor activity, likely due to opposing roles of autoreceptors versus postsynaptic receptors. Other effects of PNU-99,194 at low doses in rodents include increased nociceptive responses, hypothermia, anxiolysis, and facilitation of learning and memory, as well as augmentation and inhibition, respectively, of amphetamine-induced reward and behavioral sensitization, and reversal of morphine-induced CPP. At high doses it inhibits the self-administration of cocaine in both rats and monkeys.

See also Substituted 2-aminoindane Nafadotride GSK-598809 SB-277,011-A 7-OH-DPAT UH-232 RDS-127

References

Illustrations

Worked examples

Example 1 — a first encounter with PNU-99,194

Start with the simplest possible case. Write down what PNU-99,194 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 PNU-99,194 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 PNU-99,194 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 PNU-99,194

In research: PNU-99,194 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 PNU-99,194 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: PNU-99,194 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2-Aminoindanes, Dipropylamino compounds, Dopamine antagonists, so understanding it makes those chapters shorter.
In everyday life: Look for PNU-99,194 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 PNU-99,194 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PNU-99,194 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 PNU-99,194 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PNU-99,194 in simple terms?

Why does PNU-99,194 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 PNU-99,194?

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 PNU-99,194.