chemistry

Imidazoleacetic acid

Imidazoleacetic acid 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 Imidazoleacetic acid rather than just read about it. In short: Imidazoleacetic acid (also known as IAA, IMA, imidazole-4-acetic acid, or I4AA) is a naturally occurring endogenous metabolite of the neurotransmitter histamine (imidazole-4-ethylamine). It might have a role as an endogenous signaling molecule or neurotransmitter.

Key takeaways

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

Reference excerpt

Imidazoleacetic acid (also known as IAA, IMA, imidazole-4-acetic acid, or I4AA) is a naturally occurring endogenous metabolite of the neurotransmitter histamine (imidazole-4-ethylamine). It might have a role as an endogenous signaling molecule or neurotransmitter. IAA is formed from histamine by the enzyme diamine oxidase (DAO).

Pharmacology The compound is biologically active, acting as a relatively potent GABAA receptor partial agonist and GABAA-ρ receptor antagonist or weak partial agonist. It shows varying activational efficacies or functional selectivity at GABAA receptors of different α subunit compositions, with EmaxTooltip maximal efficacy values ranging from 24 to 72%. Unlike certain other GABAA receptor agonists like muscimol, it is not a significant GABA reuptake inhibitor. In addition to its GABA receptor interactions, IAA is an imidazoline I1 receptor ligand. It has relatively low affinity for this receptor however and it is unknown whether it is an agonist or an antagonist. As a metabolite of histamine, it is structurally distinct from other GABAA receptor agonists. Unlike γ-aminobutyric acid (GABA), IAA is orally active and is readily able to cross the blood–brain barrier. IAA produces a hypnotic state resembling sleep when administered parenterally to animals. This is often or usually accompanied by seizures. Other effects include hyperactivity, ataxia, catalepsy, analgesia, hypothermia, and hypotension. Most of these effects are thought to be due to the compound's GABAA receptor interactions. The hypotensive effects of IAA might be mediated by imidazoline I1 receptor activation, although GABAA receptor activation could alternatively explain these particular effects.

Clinical studies IAA has been clinically studied in humans, for instance in people with Huntington's disease. The drug was administered orally and intravenously, which appeared to successfully elevate circulating IAA concentrations. However, IAA did not produce behavioral or motor changes in the patients nor did it improve condition symptoms even when given at very high doses. It is possible that IAA may be rapidly eliminated in humans, which may limit the effects of exogenous IAA.

See also 1-Methylhistamine Piperidine-4-sulphonic acid Gaboxadol

References

Illustrations

Worked examples

Example 1 — a first encounter with Imidazoleacetic acid

Start with the simplest possible case. Write down what Imidazoleacetic acid 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 Imidazoleacetic acid 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 Imidazoleacetic acid 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 Imidazoleacetic acid

In research: Imidazoleacetic acid 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 Imidazoleacetic acid 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: Imidazoleacetic acid is common in secondary-school and first-year university syllabi. It links to neighbouring topics Acetic acids, Biased ligands, Drugs not assigned an ATC code, so understanding it makes those chapters shorter.
In everyday life: Look for Imidazoleacetic acid 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Imidazoleacetic acid” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Imidazoleacetic acid in 20 minutes

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

Frequently asked questions

What is Imidazoleacetic acid in simple terms?

Why does Imidazoleacetic acid 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 Imidazoleacetic acid?

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 Imidazoleacetic acid.