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Abstract Title:

Inhibitory Effect of Pycnogenol(®) on Airway Inflammation in Ovalbumin-Induced Allergic Rhinitis.

Abstract Source:

Balkan Med J. 2016 Nov ;33(6):620-626. Epub 2016 Nov 1. PMID: 27994914

Abstract Author(s):

Ceren Günel, Buket Demirci, Aylin Eryılmaz, Mustafa Yılmaz, İbrahim Meteoğlu, İmran Kurt Ömürlü, Yeşim Başal

Article Affiliation:

Ceren Günel

Abstract:

BACKGROUND: The supplement Pycnogenol(®) (PYC) has been used for the treatment of several chronic diseases including allergic rhinitis (AR). However, the in vivo effects on allergic inflammation have not been identified to date.

AIMS: To investigate the treatment results of PYC on allergic inflammation in a rat model of allergic rhinitis.

STUDY DESIGN: Animal experimentation.

METHODS: Allergic rhinitis was stimulated in 42 rats by intraperitoneal sensitization and intranasal challenge with Ovalbumin. The animals were divided into six subgroups: healthy controls, AR group, AR group treated with corticosteroid (dexamethasone 1 mg/kg; CS+AR), healthy rats group that were given only PYC of 10 mg/kg (PYC10), AR group treated with PYC of 3mg/kg (PYC3+AR), and AR group treated with PYC of 10 mg/kg (PYC10+AR). Interferon-γ (IFN-γ), interleukin-4 (IL-4), interleukin-10 (IL-10), and OVA-specific immunoglobulin E (Ig-E) levels of serum were measured. Histopathological changes in nasal mucosa and expression of tumor necrosis factor-α (TNF-α) and IL-1β were evaluated.

RESULTS: The levels of the IL-4 were significantly decreased in the PYC3+AR, PYC10+AR and CS+AR groups compared with the AR group (p=0.002, p<0.001, p=0.006). The production of the IFN-γ was significantly decreased in the PYC3+AR and PYC10+AR groups compared with the AR group (p=0.013, p=0.001). The administration of PYC to allergic rats suppressed the elevated IL-10 production, especially in the PYC3+AR group (p=0.006). Mucosal edema was significantly decreased respectively after treatment at dose 3 mg/kg and 10 mg/kg PYC (both, p<0.001). The mucosal expression of TNF-α has significantly decreased in the PYC3+AR and PYC10+AR groups (p=0.005, p<0.001), while the IL-1β expression significantly decreased in the CS+AR, PYC3+AR, and PYC10+AR groups (p<0.001, p=0.003, p=0.001).

CONCLUSION: PYC has multiple suppressive effects on allergic response. Thus, PYC may be used as a supplementary agent in allergic response.

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Sayer Ji
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