How a synthetic hormone mimics your body to switch off systemic inflammation

Nature · Published 3 October 2026 Swipe more like this →

In short: Prednisolone is a powerful synthetic corticosteroid that acts as a master switch for the immune system. By crossing cell membranes to alter gene expression, it can halt everything from severe asthma to organ transplant rejection. Yet, this potent anti-inflammatory tool comes with a complex trade-off of systemic side effects.

Derived from hydrocortisone, prednisolone is a synthetic pregnane corticosteroid that has been a staple of medicine since its approval in 1955. Its efficacy stems from its lipophilic structure, which allows it to slip through cell membranes and bind to glucocorticoid receptors in the cytoplasm. Within 20 minutes of binding, the resulting complex migrates into the cell nucleus to interact with DNA. By binding to specific response elements, it effectively silences inflammatory genes while promoting the synthesis of anti-inflammatory proteins, such as interleukin-10.

The drug’s versatility is vast, treating conditions ranging from rheumatoid arthritis and Crohn's disease to acute lymphoblastic leukemia. Depending on the dosage, it functions as either an anti-inflammatory agent or a potent immunosuppressant. Despite its utility, the drug is not without risk. Because it mimics natural hormones, long-term use can lead to significant physiological changes, including bone loss, muscle weakness, and psychiatric disturbances like mania or aggression. It also alters electrolyte balance, potentially increasing blood pressure and blood sugar levels.

The clinical application of prednisolone requires careful management, particularly when used topically in the eye. While effective for treating corneal injuries or post-surgical inflammation, prolonged ophthalmic use can lead to cataracts, corneal thinning, or glaucoma, necessitating regular monitoring of intraocular pressure. Furthermore, the drug interacts with a wide array of other medications, including anticoagulants and other immunosuppressants. Because it is a synthetic version of a natural hormone, the body’s own production can be suppressed, meaning that stopping high-dose or long-term treatment requires a careful taper to avoid adrenal insufficiency.

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