biology

Neurotrophic factor receptor

Neurotrophic factor receptor is a biology 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 Neurotrophic factor receptor rather than just read about it. In short: Neurotrophic factor receptors or neurotrophin receptors are a group of growth factor receptors which specifically bind to neurotrophins (neurotrophic factors). Two classes of neurotrophic factor receptors are the p75 and the "Trk" families of tyrosine kinase receptors. p75 is a low affinity neurotrophin receptor, to which all neurotrophins bind.

Key takeaways

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

Reference excerpt

Neurotrophic factor receptors or neurotrophin receptors are a group of growth factor receptors which specifically bind to neurotrophins (neurotrophic factors). Two classes of neurotrophic factor receptors are the p75 and the "Trk" families of tyrosine kinase receptors.

p75 is a low affinity neurotrophin receptor, to which all neurotrophins bind. It is a member of the tumour necrosis super family. In some contexts, the phrase "x" only applies to this receptor. The Trk family include TrkA, TrkB, and TrkC, and will only bind with specific neurotrophins, but with a much higher affinity. The Trks mediate the functional signals of the neurotrophins. NGF binds to TrkA, BDNF and NT-4 bind to TrkB and NT-3 binds to TrkC. In addition NT-3 also binds to and activates TrkA and TrkB but it does so less efficiently. Whilst the Trk receptors have a clearly defined trophic role, p75 receptors activate signalling pathways which can also result in apoptosis.

TrkA, B, and C receptors TrkA mediates its actions by causing the addition of phosphate molecules on certain tyrosines in the cell, activating cellular signaling. There are other related Trk receptors (TrkB and TrkC), and there are other neurotrophic factors structurally related to NGF (BDNF, NT-3, and NT-4)

TrkA mediates the effects of NGF TrkB binds and is activated by BDNF, NT-4, and NT-3 TrkC binds and is activated only by NT-3

p75NTR receptor The Low affinity nerve growth factor receptor commonly known as "p75", can signal for apoptosis or promote neuronal survival. Neurotrophins that interact with p75NTR include NGF, NT-3, BDNF, and NT-4/5. Neurotrophins activating p75NTR may initiate apoptosis (for example, via c-Jun N-terminal kinases signaling), and this effect can be counteracted by anti-apoptotic signaling by TrkA. Neurotrophin binding to p75NTR can promote neuronal survival (for example, via NF-kB activation). Although NGF has been classically described as promoting neuron survival and differentiation, research performed in the early 2000s suggest that NGF with its prodomain attached (proNGF) can elicit apoptosis of cells that are positive for the LNGFR and negative for TrkA. Secreted proNGF has been demonstrated in a variety of neuronal and non-neuronal cell populations. It has been proposed that secreted proNGF can elicit neuron death in a variety of neurodegenerative conditions, including Alzheimer's disease, following the observation of an increase of proNGF in the nucleus basalis of postmortem Alzheimer's brains .

References

Further reading Review papers offer overviews and drawings of p75NTR pathways.

External links Nerve+Growth+Factor+Receptors at the U.S. National Library of Medicine Medical Subject Headings (MeSH)

Worked examples

Example 1 — a first encounter with Neurotrophic factor receptor

Start with the simplest possible case. Write down what Neurotrophic factor receptor claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 Neurotrophic factor receptor 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 Neurotrophic factor receptor 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 Neurotrophic factor receptor

In research: Neurotrophic factor receptor appears in biology 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 Neurotrophic factor receptor 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: Neurotrophic factor receptor is common in secondary-school and first-year university syllabi. It links to neighbouring topics Receptors, Single-pass transmembrane proteins, so understanding it makes those chapters shorter.
In everyday life: Look for Neurotrophic factor receptor 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 “Neurotrophic factor receptor” →

Affiliate

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

How to study Neurotrophic factor receptor in 20 minutes

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

Frequently asked questions

What is Neurotrophic factor receptor in simple terms?

Why does Neurotrophic factor receptor matter?

Because it connects several biology 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 Neurotrophic factor receptor?

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 Neurotrophic factor receptor.