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Overview
Sulfasalazine (Azulfidine) is a synthetic salicylic acid derivative with affinity for elastin-containing connective tissues and formulated as a prodrug. Sulfasalazine induces iron death and inhibits NF-?B, TGF-? and COX-2.
1. Pharmacological Class
Type: Prodrug (inactive until metabolized)
Metabolized into:
Sulfapyridine – primarily responsible for antibacterial and some systemic effects
5-Aminosalicylic acid (5-ASA or mesalamine) – responsible for local anti-inflammatory effects in the gut
⚙️ 2. Mechanism of Action
Although the exact mechanism is complex and not fully understood, its main functional effects include:
a. Anti-inflammatory action
Inhibits cyclooxygenase (COX) and lipoxygenase pathways, reducing prostaglandin and leukotriene synthesis (key mediators of inflammation).
Scavenges reactive oxygen species (ROS), reducing oxidative tissue damage.
b. Immunomodulatory effects
Suppresses T-cell proliferation and cytokine release (e.g., TNF-α, IL-1, IL-6).
Inhibits NF-κB activation, a central transcription factor for inflammatory genes.
Reduces B-cell antibody production and natural killer (NK) cell activity.
c. Antibacterial effect (minor)
The sulfapyridine moiety has sulfonamide-type antibacterial activity, though not the main therapeutic goal.
3. Therapeutic Applications
| Disease / Condition | Functional Role of Sulfasalazine |
|---|---|
| Rheumatoid arthritis (RA) | Slows joint damage and inflammation; considered a first-line DMARD. |
| Ankylosing spondylitis | Reduces inflammation and stiffness, especially in peripheral joints. |
| Ulcerative colitis (UC) | Acts locally in the colon to reduce mucosal inflammation. |
| Crohn’s disease (colonic type) | Sometimes used, though less effective than in UC. |
| Psoriatic arthritis | Helps control synovial inflammation and pain. |
4. Cellular / Molecular Research Uses
In laboratory or experimental studies, sulfasalazine is often used to:
Inhibit NF-κB signaling in cell culture models.
Induce oxidative stress resistance or modulate glutathione metabolism.
Study cancer cell apoptosis and autophagy, since sulfasalazine inhibits xCT (SLC7A11), a cystine/glutamate antiporter, leading to glutathione depletion and ferroptosis in tumor cells.
⚠️ 5. Notable Considerations
Adverse effects: Nausea, rash, headache, reversible oligospermia, hematologic effects (e.g., agranulocytosis, anemia).
Monitoring: CBC and liver function during therapy.
Folate metabolism interference: Often supplemented with folic acid.
Chemical Properties
| Molecular Formula | C18H14N4O5S |
| Molecular Weight | 398.39 |
| CAS Numbers | 599-79-1 |
| Solubility | DMSO |
| Purity | 98% by HPLC |
| IUPAC/Chemical Name | |
| InChl Key | |
| InChl Code | |
| SMILES Code | OC(=O)C1=CC(=CC=C1O)N=NC1=CC=C(C=C1)S(=O)(=O)NC1=CC=CC=N1 |
Storage and Handling
0C Short Term, -20C Long Term
Synonyms
References
Gadangi P, et al. J Immunol,1996, 156[5], 1937-1941.