chemistry

Lysophosphatidic acid

Lysophosphatidic 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 Lysophosphatidic acid rather than just read about it. In short: A lysophosphatidic acid (LPA) is a phospholipid derivative that can act as a signaling molecule. Function LPA acts as a potent mitogen due to its activation of three high-affinity G-protein-coupled receptors called LPAR1, LPAR2, and LPAR3 (also known as EDG2, EDG4, and EDG7).

Key takeaways

Lysophosphatidic 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 Lysophosphatidic acid to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Lysophosphatidic acid from memory before moving on to harder problems.

Reference excerpt

A lysophosphatidic acid (LPA) is a phospholipid derivative that can act as a signaling molecule.

Function

LPA acts as a potent mitogen due to its activation of three high-affinity G-protein-coupled receptors called LPAR1, LPAR2, and LPAR3 (also known as EDG2, EDG4, and EDG7). Additional, newly identified LPA receptors include LPAR4 (P2RY9, GPR23), LPAR5 (GPR92) and LPAR6 (P2RY5, GPR87).

Clinical significance Because of its ability to stimulate cell proliferation, aberrant LPA-signaling has been linked to cancer in numerous ways. Dysregulation of autotaxin or the LPA receptors can lead to hyperproliferation, which may contribute to oncogenesis and metastasis. LPA may cause pruritus (itching) in individuals with cholestatic (impaired bile flow) diseases.

GTPase activation Downstream of LPA receptor activation, the small GTPase Rho can be activated, subsequently activating Rho kinase. This can lead to the formation of stress fibers and cell migration by inhibiting myosin light-chain phosphatase.

Metabolism There are several potential routes to its biosynthesis, but the most well-characterized is the action of a lysophospholipase D called autotaxin, which removes the choline group from lysophosphatidylcholine. Lysophosphatidic acids are also intermediates in the synthesis of phosphatidic acids.

See also

References

Further reading Kremer, Andreas E.; Martens, Job J.W.W.; Kulik, Wim; Ruëff, Franziska; Kuiper, Edith M.M.; Van Buuren, Henk R.; Van Erpecum, Karel J.; Kondrackiene, Jurate; et al. (2010). "Lysophosphatidic Acid is a Potential Mediator of Cholestatic Pruritus". Gastroenterology. 139 (3): 1008–18, 1018.e1. doi:10.1053/j.gastro.2010.05.009. PMID 20546739. Moolenaar, Wouter H. (1995). "Lysophosphatidic Acid, a Multifunctional Phospholipid Messenger". The Journal of Biological Chemistry. 270 (22): 12949–52. doi:10.1074/jbc.270.22.12949. PMID 7768880. Mills, Gordon B.; Moolenaar, Wouter H. (2003). "The emerging role of lysophosphatidic acid in cancer". Nature Reviews Cancer. 3 (8): 582–91. doi:10.1038/nrc1143. PMID 12894246. S2CID 29079135. Panupinthu, N; Lee, H Y; Mills, G B (2010). "Lysophosphatidic acid production and action: Critical new players in breast cancer initiation and progression". British Journal of Cancer. 102 (6): 941–6. doi:10.1038/sj.bjc.6605588. PMC 2844037. PMID 20234370. Park, S Y; Jeong, K J; Panupinthu, N; Yu, S; Lee, J; Han, J W; Kim, J M; Lee, J-S; et al. (2010). "Lysophosphatidic acid augments human hepatocellular carcinoma cell invasion through LPA1 receptor and MMP-9 expression". Oncogene. 30 (11): 1351–9. doi:10.1038/onc.2010.517. PMID 21102517. Yakubu, M A; Liliom, K; Tigyi, G J; Leffler, C W (1997). "Role of lysophosphatidic acid in endothelin-1-and hematoma-induced alteration of cerebral microcirculation". American Journal of Physiology. Regulatory, Integrative and Comparative Physiology. 273 (2): R703–R709. doi:10.1152/ajpregu.1997.273.2.R703. Tigyi, G J; Hong, L; Yakubu, M; Parfenova, H; Shibata, M; Leffler, C W (1995). "Lysophosphatidic acid alters cerebrovascular reactivity in piglets". American Journal of Physiology. Heart and Circulatory Physiology. 268 (5): H2048–H2055. doi:10.1152/ajpheart.1995.268.5.H2048. PMID 7771554.

Illustrations

Worked examples

Example 1 — a first encounter with Lysophosphatidic acid

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

In research: Lysophosphatidic 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 Lysophosphatidic 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: Lysophosphatidic acid is common in secondary-school and first-year university syllabi. It links to neighbouring topics Phospholipids, so understanding it makes those chapters shorter.
In everyday life: Look for Lysophosphatidic 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.

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How to study Lysophosphatidic acid in 20 minutes

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

Frequently asked questions

What is Lysophosphatidic acid in simple terms?

A lysophosphatidic acid (LPA) is a phospholipid derivative that can act as a signaling molecule. Function LPA acts as a potent mitogen due to its activation of three high-affinity G-protein-coupled receptors called LPAR1, LPAR2, and LPAR3 (also known as EDG2, EDG4, and EDG7).

Why does Lysophosphatidic 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 Lysophosphatidic 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 Lysophosphatidic acid.