sCD48 is elevated in non-allergic but not in allergic persistent rhinitis

Area of Science:

• Immunology
• Rhinology

Background:

• CD48 is a costimulatory immune receptor.
• CD48 interactions with CD244 (2B4) on mast cells and eosinophils suggest a role in inflammation.
• This study investigates CD48's role in persistent allergic rhinitis (PAR) and non-allergic rhinitis (NAR).

Purpose of the Study:

• To explore the role of CD48 in PAR and NAR.
• To compare serum levels of soluble CD48 (sCD48) and eosinophil markers in rhinitis patients and controls.

Main Methods:

• Serum samples from 70 subjects (20 PAR, 15 NAR, 35 controls) were analyzed for sCD48, eosinophil cationic protein (ECP), and eotaxin-1/CCL11.
• Rhinitis symptom intensity was assessed using the Total Nasal Symptom Score.
• Fractional exhaled nitric oxide (FeNO) and neutrophil-to-lymphocyte (NLR) and eosinophil-to-lymphocyte (ELR) ratios were evaluated.

Main Results:

• Significantly higher sCD48 serum levels were found in the NAR group compared to PAR and control groups.
• Serum sCD48 levels correlated significantly with eosinophil counts.
• ECP and eotaxin-1/CCL11 levels were also significantly elevated in the NAR group.

Conclusions:

• CD48 may be implicated in the eosinophilic inflammatory processes characteristic of non-allergic rhinitis.
• Elevated sCD48 and eosinophil markers in NAR suggest a distinct pathophysiological pathway.