Abstract | BACKGROUND:
Osteoarthritis is increasingly recognized as the result of a complex interplay between inflammation, chrondrodegeneration, and pain. Joint mast cells are considered to play a key role in orchestrating this detrimental triad. ALIAmides down-modulate mast cells and more generally hyperactive cells. Here we investigated the safety and effectiveness of the ALIAmide N-palmitoyl-D- glucosamine ( PGA) in inflammation and osteoarthritis pain. METHODS: Acute toxicity of micronized PGA (m- PGA) was assessed in rats following OECD Guideline No.425. PGA and m- PGA (30 mg/kg and 100 mg/kg) were orally administered to carrageenan (CAR)-injected rats. Dexamethasone 0.1 mg/kg was used as reference. Paw edema and thermal hyperalgesia were measured up to 6 h post-injection, when also myeloperoxidase activity and histological inflammation score were assessed. Rats subjected to intra-articular injection of sodium monoiodoacetate (MIA) were treated three times per week for 21 days with PGA or m- PGA (30 mg/kg). Mechanical allodynia and motor function were evaluated at different post-injection time points. Joint histological and radiographic damage was scored, articular mast cells were counted, and macrophages were immunohistochemically investigated. Levels of TNF-α, IL-1β, NGF, and MMP-1, MMP-3, and MMP-9 were measured in serum using commercial colorimetric ELISA kits. One- or two-way ANOVA followed by a Bonferroni post hoc test for multiple comparisons was used. RESULTS: Acute oral toxicity of m- PGA resulted in LD50 values in excess of 2000 mg/kg. A single oral administration of PGA and m- PGA significantly reduced CAR-induced inflammatory signs ( edema, inflammatory infiltrate, and hyperalgesia), and m- PGA also reduced the histological score. Micronized PGA resulted in a superior activity to PGA on MIA-induced mechanical allodynia, locomotor disability, and histologic and radiographic damage. The MIA-induced increase in mast cell count and serum level of the investigated markers was also counteracted by PGA and to a significantly greater extent by m- PGA. CONCLUSIONS: The results of the present study showed that PGA is endorsed with anti-inflammatory, pain-relieving, and joint-protective effects. Moreover, it proved that particle size reduction greatly enhances the activity of PGA, particularly on joint pain and disability. Given these results, m- PGA could be considered a valuable option in the management of osteoarthritis.
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Authors | Marika Cordaro, Rosalba Siracusa, Daniela Impellizzeri, Ramona D' Amico, Alessio Filippo Peritore, Rosalia Crupi, Enrico Gugliandolo, Roberta Fusco, Rosanna Di Paola, Carlo Schievano, Salvatore Cuzzocrea |
Journal | Arthritis research & therapy
(Arthritis Res Ther)
Vol. 21
Issue 1
Pg. 254
(11 28 2019)
ISSN: 1478-6362 [Electronic] England |
PMID | 31779692
(Publication Type: Journal Article)
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Chemical References |
- Analgesics
- Tumor Necrosis Factor-alpha
- Carrageenan
- Matrix Metalloproteinase 1
- Glucosamine
- Iodoacetic Acid
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Topics |
- Analgesics
(chemistry, pharmacology)
- Animals
- Carrageenan
- Female
- Glucosamine
(chemistry, pharmacology)
- Hyperalgesia
(chemically induced, prevention & control)
- Inflammation
(drug therapy, physiopathology)
- Iodoacetic Acid
- Male
- Mast Cells
(cytology, drug effects)
- Matrix Metalloproteinase 1
(blood)
- Osteoarthritis
(drug therapy, physiopathology)
- Pain
(chemically induced, physiopathology, prevention & control)
- Pain Measurement
(methods)
- Particle Size
- Rats, Sprague-Dawley
- Toxicity Tests
- Tumor Necrosis Factor-alpha
(blood)
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