%0 Journal Article %T Macrolide Therapy in Chronic Inflammatory Diseases %A Brygida Kwiatkowska %A Maria Ma£¿li¨½ska %J Mediators of Inflammation %D 2012 %I Hindawi Publishing Corporation %R 10.1155/2012/636157 %X Macrolides are a group of antibiotics with a distinctive macrocyclic lactone ring combined with sugars (cladinose, desosamine). The action of macrolides is to block protein synthesis by binding to the subunit of 50S ribosome of bacteria. Prototype macrolide was erythromycin, which came into clinical practice in the 50s of the 20th century. Its antimicrobial spectrum covers the scope of the penicillins but is extended to the impact of atypical bacteria. In the 90s more drugs of this group were synthesized¡ªthey have less severe side effects than erythromycin, extended spectrum of Gram-negative bacteria. Macrolides are effective in treating mycobacterial infections especially in patients infected with HIV. It is now known that in addition to antibacterial abilities, macrolides have immunomodulatory effects¡ªthey inhibit the production of proinflammatory cytokines (TNF, IL1, 6, and 8) affect transcription factors (NF-¦ÊB) as well as costimulaton (CD 80) and adhesion molecules (ICAM). This review article focused not only on the their antimicrobial abilities but also on efficacy in the treatment of several inflammatory disorders independent of the infectious agent. Their wider use as immunomodulators requires further study, which can lead to an extension of indications for their administration. 1. Introduction The name ¡°macrolide¡± covers a family of different antibiotics produced by fungi of the genus Streptomyces and some bacteria such as Arthrobacter spp. Construction of macrolides is based on the large macrocyclic lacton ring, the activity of which is due to the presence of macrolide ring containing one or more deoxy sugar (usually cladinose-neutral sugar and desosamine-amino sugar). Lactone rings usually consist of 14, 15 or 16 members. Erythromycin is a macrolide prototype¡ªit contains 14-membered lactone rings, (Figure 1). Its first clinical use in the upper respiratory tract infections occurred in the 50s of the 20th century. Other macrolides with 14-membered ring include clarithromycin, dirithromycin, oleandomycin, roxithromycin, and 16-membered ring: josamycin, midecamycin, mikamycin, and spiramycin. Also stands out azalide¡ª15-membered ring macrolide¡ªazithromycin, and, we can also distinguish ketolides with 14-membered ring such as telithromycin and cethromycin. Tacrolimus isolated from Streptomyces tsukubaensis and sirolimus isolated from Streptomyces hygroscopicus also belong to this group of antibiotics (Figure 3). Figure 1: 14 member lactone rings of erythromycin. 2. The Mechanism of Antibacterial Action of Macrolides Macrolide antibiotics have been %U http://www.hindawi.com/journals/mi/2012/636157/