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Prostaglandins: Function, Effects and Medical Relevance

Prostaglandins are naturally occurring signaling molecules that regulate inflammation, pain, and many other body functions. They play a key role in medicine.

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Things worth knowing about "Prostaglandins"

Prostaglandins are naturally occurring signaling molecules that regulate inflammation, pain, and many other body functions. They play a key role in medicine.

What Are Prostaglandins?

Prostaglandins are a group of lipid-derived signaling molecules known as eicosanoids. They are synthesized in the body from polyunsaturated fatty acids, primarily from arachidonic acid. They act mainly locally, near the site of their production, and influence a wide range of physiological processes. Prostaglandins are produced in virtually all tissues of the human body and are among the most important mediators of inflammatory responses.

Biosynthesis and Mechanism of Action

Prostaglandins are produced via the enzyme cyclooxygenase (COX), which exists in two main forms: COX-1 (constitutively active, helps protect the stomach lining) and COX-2 (strongly upregulated during inflammation). The COX enzyme converts arachidonic acid into prostaglandin H2, which is then further processed into various prostaglandins (e.g., PGE2, PGI2, PGD2, PGF2α). Prostaglandins bind to specific receptors on cell surfaces and trigger intracellular signaling cascades.

Biological Functions

Regulation of inflammation: Prostaglandins, especially PGE2, are central mediators of redness, swelling, heat, and pain during inflammatory responses.
Pain perception: They sensitize pain receptors (nociceptors) to mechanical and chemical stimuli, thereby amplifying the sensation of pain.
Fever: PGE2 acts on the hypothalamus to raise the core body temperature, triggering fever.
Vascular tone: Prostaglandins can cause blood vessels to dilate or constrict, influencing blood pressure regulation.
Gastric mucosal protection: COX-1-dependent prostaglandins stimulate mucus production in the stomach, protecting the lining from gastric acid.
Reproduction: Prostaglandins are important in labor induction, ovulation, and embryo implantation.
Kidney function: They regulate renal blood flow and the excretion of water and electrolytes.
Platelet function: PGI2 (prostacyclin) inhibits platelet aggregation and promotes vasodilation.

Prostaglandins in Medicine

Inhibition by Medications

Many common pain and anti-inflammatory drugs, known as nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen, aspirin, and diclofenac, work by inhibiting COX enzymes. This reduces prostaglandin synthesis, thereby relieving pain, inflammation, and fever. Selective COX-2 inhibitors (coxibs) were developed to spare the gastric mucosa, as they have less effect on COX-1.

Therapeutic Use of Prostaglandins

Synthetic prostaglandin analogues are used in various medical fields:

Obstetrics and gynecology: Misoprostol (PGE1 analogue) and dinoprostone (PGE2) are used for labor induction and pregnancy termination.
Ophthalmology: Latanoprost and other PGF2α analogues are used as eye drops to treat glaucoma by reducing intraocular pressure.
Cardiology and vascular medicine: Alprostadil (PGE1) is used for peripheral arterial disease and the treatment of erectile dysfunction.
Pulmonary arterial hypertension: Epoprostenol (PGI2) and other prostacyclin analogues are used to treat pulmonary hypertension.

Clinical Significance

An imbalance in prostaglandin synthesis can contribute to various diseases. Excessive prostaglandin production is associated with chronic inflammatory conditions such as rheumatoid arthritis, Crohn's disease, and dysmenorrhea (painful menstruation). Prostaglandins are also implicated in the development of certain cancers and cardiovascular diseases.

References

Rang HP, Dale MM, Ritter JM et al. – Rang and Dale's Pharmacology. 9th edition. Elsevier, 2019.
Funk CD – Prostaglandins and Leukotrienes: Advances in Eicosanoid Biology. Science. 2001;294(5548):1871–1875. PubMed PMID: 11729303.
World Health Organization (WHO) – Model Formulary: Prostaglandins and Oxytocics. WHO Essential Medicines, 2023.

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