Related Experiment Video

Updated: Jun 19, 2026

Modeling Multiple Sclerosis in the Two Sexes: MOG35-55-Induced Experimental Autoimmune Encephalomyelitis
05:44

Modeling Multiple Sclerosis in the Two Sexes: MOG35-55-Induced Experimental Autoimmune Encephalomyelitis

Published on: October 13, 2023

Macrolide antibiotics aggravate experimental autoimmune encephalomyelitis and inhibit inducible nitric oxide synthase

Dunjing Wang1, Zhengqi Lu, Liping Hu

  • 1Department of Neurology, The Third Affiliated hospital of Sun Yat-sen University, Guangzhou, China.

Immunological Investigations
|October 9, 2009
PubMed

Insights

Macrolide antibiotics like clarithromycin and azithromycin may worsen experimental autoimmune encephalomyelitis (EAE) by inhibiting nitric oxide production. Further research is needed for multiple sclerosis (MS) patients.

Area of Science:

  • Neuroimmunology
  • Infectious Disease Immunology

Background:

  • Chlamydia pneumoniae (C. pneumoniae) infection is implicated in multiple sclerosis (MS) pathogenesis.
  • Macrolide antibiotics, used against C. pneumoniae, possess immunomodulatory properties.
  • The impact of macrolides on autoimmune neurological conditions like experimental autoimmune encephalomyelitis (EAE) requires investigation.

Purpose of the Study:

  • To investigate the effects of macrolide antibiotics (clarithromycin and azithromycin) on EAE, an animal model for MS.
  • To determine the influence of these antibiotics on nitric oxide (NO) production and inducible nitric oxide synthase (iNOS) expression.

Main Methods:

  • EAE was induced in rats using MBP68-86 peptide and CFA.
  • Rats were treated daily with clarithromycin or azithromycin starting two days before immunization.
  • Nitric oxide (NO) levels, iNOS mRNA, and protein expression were measured in spinal cords and cultured mononuclear cells (MNCs).

Main Results:

  • Macrolide administration did not prevent EAE development but led to more severe symptoms.
  • Both clarithromycin and azithromycin significantly inhibited NO production in vivo and in vitro.
  • Inhibition of iNOS mRNA and protein expression was observed in both serum and cultured MNCs.

Conclusions:

  • Macrolide antibiotics may exacerbate EAE by suppressing iNOS expression and NO production.
  • These findings suggest a potential negative impact of macrolides in the context of MS.
  • Further studies are warranted to explore the role of macrolides and other anti-chlamydial agents in MS management.

More Related Videos

Scoring Central Nervous System Inflammation, Demyelination, and Axon Injury in Experimental Autoimmune Encephalomyelitis08:17

Scoring Central Nervous System Inflammation, Demyelination, and Axon Injury in Experimental Autoimmune Encephalomyelitis

Published on: February 23, 2024

Myelin Oligodendrocyte Glycoprotein (MOG35-55) Induced Experimental Autoimmune Encephalomyelitis (EAE) in C57BL/6 Mice08:03

Myelin Oligodendrocyte Glycoprotein (MOG35-55) Induced Experimental Autoimmune Encephalomyelitis (EAE) in C57BL/6 Mice

Published on: April 15, 2014

Related Concept Videos

Nitric Oxide Signaling Pathway01:28

Nitric Oxide Signaling Pathway

Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure to...
Inhibitors of Bacterial Protein Synthesis01:25

Inhibitors of Bacterial Protein Synthesis

Aminoglycosides constitute a highly potent class of bactericidal antibiotics that exert their antimicrobial effects by targeting the bacterial ribosome, specifically disrupting protein synthesis. These polycationic molecules consist of amino-modified sugars linked via glycosidic bonds to an aminocyclitol core such as 2-deoxystreptamine or streptamine. Their strong positive charges facilitate tight binding to the negatively charged phosphate backbone of ribosomal RNA (rRNA), primarily at the 16S...
Encephalitis ll: Pathophysiology01:26

Encephalitis ll: Pathophysiology

Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...