biology

VISTA (protein)

VISTA (protein) 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 VISTA (protein) rather than just read about it. In short: V-domain Ig suppressor of T cell activation (VISTA) is a type I transmembrane protein that functions as an immune checkpoint and is encoded by the VSIR gene. Structure and function VISTA is approximately 50 kDa and belongs to the immunoglobulin superfamily and has one IgV domain.

Key takeaways

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

Reference excerpt

V-domain Ig suppressor of T cell activation (VISTA) is a type I transmembrane protein that functions as an immune checkpoint and is encoded by the VSIR gene.

Structure and function VISTA is approximately 50 kDa and belongs to the immunoglobulin superfamily and has one IgV domain. VISTA is part of the B7 family, is primarily expressed in white blood cells and its transcription is partially controlled by p53. There is evidence that VISTA can act as a ligand that engages an inhibitory receptor LRIG1 on T cells and impairs T cell activation and function. Another binding partner for VISTA is PSGL-1, which binds VISTA only under acidic conditions (pH<6.5). VISTA expressed on T cells also intrinsically suppresses T cell activation, likely by engaging other inhibitory receptors on the same cell. Aside from T cells, VISTA is highly expressed on macrophages and myeloid-derived suppressor cells (MDSCs) and regulates their differentiation and function. Similarly, VISTA and TIM-3 may co-exist on macrophages infiltrating different human and mouse tumours where they can co-regulate immunotherapy resistance.

Clinical significance VISTA is expressed at high levels in tumor-infiltrating lymphocytes, such as myeloid-derived suppressor cells and regulatory T cells, and its blockade with an antibody results in delayed tumor growth in mouse models of melanoma and squamous cell carcinoma. It is also up-regulated in tumour-associated macrophages in various malignancies, including melanoma, especially in immunotherapy-resistant human context. VISTA cooperates with another immune checkpoint receptor PD-1 in modulating anti-tumor immunity and autoimmunity. Monocytes from HIV-infected patients produce higher levels of VISTA compared to uninfected individuals. The increased VISTA levels correlated with an increase in immune activation and a decrease in CD4-positive T cells.

As a drug target There are several ongoing cancer immunotherapy clinical trials for a monoclonal antibodies targeting VISTA in advanced cancer. Preliminary results of the phase I clinical trials show good safety tolerance and anti-cancer activity in patients with advanced tumours. One new approach uses an antibody (SNS-101) that only binds to VISTA when the multiple histidine residues of VISTA are protonated inside acid tumors. This approach improves the pharmacokinetics of the anti-VISTA antibody. Another ongoing clinical trial involves a small molecule that antagonizes the programmed death-ligands 1 and 2 (PD-L1 and PD-L2), and VISTA pathways in patients with advanced solid tumors or lymphomas.

References

Illustrations

Worked examples

Example 1 — a first encounter with VISTA (protein)

Start with the simplest possible case. Write down what VISTA (protein) 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 VISTA (protein) 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 VISTA (protein) 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 VISTA (protein)

In research: VISTA (protein) 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 VISTA (protein) 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: VISTA (protein) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 10, Immune system, so understanding it makes those chapters shorter.
In everyday life: Look for VISTA (protein) 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 VISTA (protein) in 20 minutes

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

Frequently asked questions

What is VISTA (protein) in simple terms?

V-domain Ig suppressor of T cell activation (VISTA) is a type I transmembrane protein that functions as an immune checkpoint and is encoded by the VSIR gene. Structure and function VISTA is approximately 50 kDa and belongs to the immunoglobulin superfamily and has one IgV domain.

Why does VISTA (protein) 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 VISTA (protein)?

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 VISTA (protein).