chemistry

Prostaglandin E2

Prostaglandin E2 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 Prostaglandin E2 rather than just read about it. In short: Prostaglandin E2 (PGE2), also known as dinoprostone, is a naturally occurring prostaglandin with oxytocic properties that is used as a medication. Dinoprostone is used in labor induction, bleeding after delivery, termination of pregnancy, and in newborn babies to keep the ductus arteriosus open.

Key takeaways

Prostaglandin E2 belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Prostaglandin E2 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Prostaglandin E2 from memory before moving on to harder problems.

Reference excerpt

Prostaglandin E2 (PGE2), also known as dinoprostone, is a naturally occurring prostaglandin with oxytocic properties that is used as a medication. Dinoprostone is used in labor induction, bleeding after delivery, termination of pregnancy, and in newborn babies to keep the ductus arteriosus open. In babies it is used in those with congenital heart defects until surgery can be carried out. It is also used to manage gestational trophoblastic disease. It may be used within the vagina or by injection into a vein. PGE2 synthesis within the body begins with the activation of arachidonic acid (AA) by the enzyme phospholipase A2. Once activated, AA is oxygenated by cyclooxygenase (COX) enzymes to form prostaglandin endoperoxides. Specifically, prostaglandin G2 (PGG2) is modified by the peroxidase moiety of the COX enzyme to produce prostaglandin H2 (PGH2) which is then converted to PGE2. Common side effects of PGE2 include nausea, vomiting, diarrhea, fever, and excessive uterine contraction. In babies there may be decreased breathing and low blood pressure. Caution should be taken in people with asthma or glaucoma and it is not recommended in those who have had a prior C-section. It works by binding and activating the prostaglandin E2 receptor which results in the opening and softening of the cervix and dilation of blood vessels. Prostaglandin E2 was first synthesized in 1970 and approved for medical use by the FDA in the United States in 1977. It is on the World Health Organization's List of Essential Medicines. Prostaglandin E2 works as well as prostaglandin E1 in babies.

Physiological effects Dinoprostone has important effects in labor by inducing softening of the cervix and causing uterine contraction, and also stimulates osteoblasts to release factors that stimulate bone resorption by osteoclasts. Natural prostaglandins, including PGE1 and PGE2, are important in the structure and function of the ductus arteriosus in fetuses and newborns. They allow the ductus arteriosus to remain open, providing the necessary connection between the pulmonary artery and descending aorta that allows the blood to bypass the fetus's underdeveloped lungs and be transported to the placenta for oxygenation. The ductus arteriosus normally begins to close upon birth due to an increase of PGE2 metabolism, but in newborns with congenital heart disease, prostaglandins can be used to keep the ductus arteriosus open longer than normal to sustain healthy oxygen saturation levels in the blood. Although PGE1 is more commonly used in this setting, there has been a report of oral PGE2 being used to treat ductus-dependent congenital heart diseases in newborns to delay surgical treatment until the pulmonary arteries grew. In addition, PGE2 was used in another report to dilate the ductus arteriosus in newborns with various cardiovascular defects to allow for better perfusion of the lungs and kidneys. On the other hand, the post-partal synthesis of PGE2 in newborns is considered one cause of patent ductus arteriosus. When administered in aerosol form, PGE2 serves as a bronchodilator, but its use in this setting is limited by the fact that it also causes coughing. PGE2, similarly to PGE1, acts as a direct vasodilator by acting on smooth muscle to cause dilation of blood vessels. In addition, PGE2 inhibits platelet aggregation. PGE2 also suppresses T cell receptor signaling and proliferation, and may play a role in resolution of inflammation. In addition, PGE2 limits the immune response by preventing B-lymphocyte differentiation and their ability to present antigens.

Central and peripheral nervous systems effects Prostaglandin E2 (PGE2) has a variety of functions within the central nervous system and peripheral nervous system. When PGE2 interacts with EP3 receptors, it increases body temperature, resulting in fever. PGE2 is also a predominant prostanoid that contributes to inflammation via enhancing edema and leukocyte infiltration from increased vascular permeability (allowing more blood flow into an inflamed area of the body) when acting on EP2 receptors. The use of nonsteroidal anti-inflammatory drugs (NSAIDs) blocks the activity of COX-2, resulting in a decrease of PGE2 production. NSAIDs blocking COX-2 and decreasing the production of PGE2 remediates fever and inflammation. Additionally, PGE2 acting on EP1 and EP4 receptors are a component in feeling pain via inflammatory nociception. When PGE2 binds to EP1 and EP4 receptors, an increase in excitability via cation channels as well as inhibition of hyperpolarizing potassium (K+) channels, increase membrane excitability. As a result, this causes peripheral nerve endings to report painful stimuli.

Immunity As mentioned previously, prostaglandin E2 (PGE2) contributes to the inflammation when bound to EP2 receptors. In terms of immunity, prostaglandins have the ability to regulate lymphocyte function. PGE2 affects T-lymphocyte formation by regulating apoptosis of immature thymocytes. In addition, it can suppress an immune response by inhibiting B lymphocytes from forming into antibody-secreting plasma cells. When this process is suppressed, it causes a decrease in a humoral antibody response because of the decrease in production of antibodies. PGE2 also has roles in inhibition of cytotoxic T-cell function, cell division of T-lymphocytes, and the development of TH1 lymphocytes.

Neurological effects In response to physiologic and psychologic stress, prostaglandin E2 (PGE2) is involved in several inflammation and immunity pathways. As one of the most abundant prostaglandins in the body, PGE2 is involved in almost all typical inflammation markers such as redness, swelling, and pain. It regulates these responses through binding to G coupled protein prostaglandin E2 receptors (EP1, EP2, EP3, and EP4). The activation of these different EP receptors is dependent on the type of triggering stress stimuli and results in the corresponding stress response. Activation of EP1 via PGE2 results in the suppression of impulse behaviors in response to psychological stress. PGE2 is involved in regulating illness-induced memory impairment via activation of EP2. PGE2 activation of EP3 results in regulation of illness induced fever. EP4 is functionally similar to EP2 and has also been shown in studies to have a role in hypothermia and anorexia. In addition to inflammatory effects, PGE2 has been shown to have anti-inflammatory effects as well, due to its different actions on varying receptors.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Prostaglandin E2

Start with the simplest possible case. Write down what Prostaglandin E2 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 Prostaglandin E2 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 Prostaglandin E2 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 Prostaglandin E2

In research: Prostaglandin E2 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 Prostaglandin E2 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: Prostaglandin E2 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Abortifacients, Alkene derivatives, Aromatase inhibitors, so understanding it makes those chapters shorter.
In everyday life: Look for Prostaglandin E2 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 Prostaglandin E2 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Prostaglandin E2 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 Prostaglandin E2 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Prostaglandin E2 in simple terms?

Why does Prostaglandin E2 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 Prostaglandin E2?

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 Prostaglandin E2.