chemistry

G-CSF factor stem-loop destabilising element

G-CSF factor stem-loop destabilising element 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 G-CSF factor stem-loop destabilising element rather than just read about it. In short: The G-CSF factor stem-loop destabilising element (SLDE) is an RNA element secreted by fibroblasts and endothelial cells in response to the inflammatory mediators interleukin-1 (IL-1) and tumour necrosis factor-alpha and by activated macrophages. The synthesis of G-CSF is regulated both transcriptionally and through control of mRNA stability.

Key takeaways

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

Reference excerpt

The G-CSF factor stem-loop destabilising element (SLDE) is an RNA element secreted by fibroblasts and endothelial cells in response to the inflammatory mediators interleukin-1 (IL-1) and tumour necrosis factor-alpha and by activated macrophages. The synthesis of G-CSF is regulated both transcriptionally and through control of mRNA stability. In unstimulated cells G-CSF mRNA is unstable but becomes stabilised in response to IL-1 or tumour necrosis factor alpha, and also in the case of monocytes and macrophages, in response to lipopolysaccharide. It is likely that the presence of the SLDE in the G-CSF mRNA contributes to the specificity of regulation of G-CSF mRNA and enhances the rate of shortening of the poly(A) tail. Adenylate uridylate-rich elements (AUREs) are present in other cytokine mRNAs, but the SLDE is the most important element that stabilizes G-CSF mRNA in response to IL-1 or tumor necrosis factor- alpha. Additionally, there are destabilizing elements similar to SLDE found in IL-2 and IL-6. The 3'-UTR of G-CSF mRNA contains a destabilizing element that is insensitive to calcium ionophore, hence SLDE regulates G-CSF mRNA. AUDEs do not function in 5637 Bladder carcinoma cells, but the SLDE does. The two destablizing elements, SLDE and AURE, provide multiple mechanisms to regulate cytokine expression. Neutrophils, are the most abundant type of granulocytes and are responsible for leading the first response of the immune system response against invaders. Granulocyte-colony stimulating factor (G-CSF) is a glycoprotein that stimulates proliferation of neutrophil progenitor cells and leads to the maturation of neutrophils. monocytes and macrophages are the cells that secrete G-CSF, but it is found that endothelial cells, fibroblasts, and bone marrow stromal cells also secrete the glycoprotein. Expression of G-CSF glycoprotein is complex and has both transcription and post transcription regulation. Two specific types of regulatory elements are present in the 3' untranslated region (3'UTR) of G-CSF mRNA. These elements are referred to as adenylate uridylate-rich elements (AUREs) and stem-loop destabilizing element (SLDE). They have been shown to be destabilizing elements of the G-CSF mRNA. On the other hand, the stability of the mRNA is regulated by p38 mitogen-activated protein kinase (MAPK) and this phosphorylating enzyme has been shown to be linked to the AUREs in the 3'UTR.

SB203580 specifically inhibits the catalytic activity of p38 MAPK by competitively binding to the active site where ATP is supposed to bind and is used to probe the role of p38 MAPK in cells. SB203580 amplified the lipopolysaccharide-induced increase in the G-CSF mRNA levels in mouse bone marrow-derived macrophages and in THP-1 human macrophages. By displaying that the decay of G-CSF mRNA, in the presence of actinomycin D, was slower in SB203580-treated cells. SB203580 increased the stability of G-CSF mRNA. SLDE is essential for the SB203580-induced increase in the stability of mRNA.

References

External links

Page for G-CSF factor stem-loop destabilising element (SLDE) at Rfam

Illustrations

Worked examples

Example 1 — a first encounter with G-CSF factor stem-loop destabilising element

Start with the simplest possible case. Write down what G-CSF factor stem-loop destabilising element 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 G-CSF factor stem-loop destabilising element 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 G-CSF factor stem-loop destabilising element 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 G-CSF factor stem-loop destabilising element

In research: G-CSF factor stem-loop destabilising element 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 G-CSF factor stem-loop destabilising element 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: G-CSF factor stem-loop destabilising element is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cis-regulatory RNA elements, Molecular and cellular biology stubs, so understanding it makes those chapters shorter.
In everyday life: Look for G-CSF factor stem-loop destabilising element 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 G-CSF factor stem-loop destabilising element in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what G-CSF factor stem-loop destabilising element 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.
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Frequently asked questions

What is G-CSF factor stem-loop destabilising element in simple terms?

Why does G-CSF factor stem-loop destabilising element 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 G-CSF factor stem-loop destabilising element?

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 G-CSF factor stem-loop destabilising element.