science

GABAA receptor negative allosteric modulator

GABAA receptor negative allosteric modulator is a science 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 GABAA receptor negative allosteric modulator rather than just read about it. In short: A GABAA receptor negative allosteric modulator is a negative allosteric modulator (NAM), or inhibitor, of the GABAA receptor, a ligand-gated ion channel of the major inhibitory neurotransmitter γ-aminobutyric acid (GABA). They are closely related and similar to GABAA receptor antagonists.

Key takeaways

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Reference excerpt

A GABAA receptor negative allosteric modulator is a negative allosteric modulator (NAM), or inhibitor, of the GABAA receptor, a ligand-gated ion channel of the major inhibitory neurotransmitter γ-aminobutyric acid (GABA). They are closely related and similar to GABAA receptor antagonists. The effects of GABAA receptor NAMs are functionally the opposite of those of GABAA receptor positive allosteric modulators (PAMs) like the benzodiazepines, barbiturates, and ethanol (alcohol). Non-selective GABAA receptor NAMs can produce a variety of effects including convulsions, neurotoxicity, and anxiety, among others. Selective NAMs (or "inverse agonists") of α5 subunit-containing GABAA receptors, such as basmisanil and α5IA, do not have convulsant or anxiogenic effects but instead show cognitive- and memory-enhancing or nootropic-like effects. They are under investigation for the treatment of cognitive impairment in conditions like Down syndrome and schizophrenia. In addition, the selective α5 subunit-containing GABAA receptor NAMs L-655,708 and MRK-016 have been found to produce rapid-acting antidepressant effects in animals similar to those of the NMDA receptor antagonist ketamine, and are of interest for the potential treatment of depression. Additional selective α5 subunit-containing GABAA receptor NAMs include PNV-001, PWZ-029, Ro4938581, and TB-21007. Certain drugs show weak GABAA receptor NAM activity as an off-target activity that is responsible for undesirable side effects like anxiety, insomnia, and seizures. Examples include fluoroquinolone antibiotics like ciprofloxacin, β-lactam antibiotics like penicillin, ceftriaxone, and imipenem, nonsteroidal antiandrogens like enzalutamide and apalutamide, and the antidepressant bupropion. Other GABAA NAMs, mostly non-selective, include amentoflavone, bemegride, bilobalide, cicutoxin, dieldrin, FG-7142, fipronil, flurothyl, iomazenil, laudanosine, lindane, oenanthotoxin, pentylenetetrazol, phenylsilatrane, picrotoxin, radequinil, Ro15-4513, sarmazenil, suritozole, terbequinil, tetramethylenedisulfotetramine (TETS), and ZK-93426 as well as the endogenous neurosteroids dehydroepiandrosterone sulfate (DHEA-S), pregnenolone sulfate, epipregnanolone, and isopregnanolone. Some naturally occurring GABAA receptor NAMs like cicutoxin and picrotoxin are considered to be toxins. Other GABAA receptor NAMs like dieldrin and fipronil are used as insecticides (IRAC group 2), and TETS is used as a rodenticide, and yet other GABAA receptor NAMs like bemegride, flurothyl, and pentylenetetrazol are used for clinical purposes.

See also GABAA receptor positive allosteric modulator AMPA receptor positive allosteric modulator List of investigational antidepressants

References

Worked examples

Example 1 — a first encounter with GABAA receptor negative allosteric modulator

Start with the simplest possible case. Write down what GABAA receptor negative allosteric modulator claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 GABAA receptor negative allosteric modulator 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 GABAA receptor negative allosteric modulator 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 GABAA receptor negative allosteric modulator

In research: GABAA receptor negative allosteric modulator appears in science 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 GABAA receptor negative allosteric modulator 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: GABAA receptor negative allosteric modulator is common in secondary-school and first-year university syllabi. It links to neighbouring topics Convulsants, GABAA receptor negative allosteric modulators, Pesticides, so understanding it makes those chapters shorter.
In everyday life: Look for GABAA receptor negative allosteric modulator 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 GABAA receptor negative allosteric modulator in 20 minutes

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Frequently asked questions

What is GABAA receptor negative allosteric modulator in simple terms?

Why does GABAA receptor negative allosteric modulator matter?

Because it connects several science 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 GABAA receptor negative allosteric modulator?

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 GABAA receptor negative allosteric modulator.