he nose, researchers say, toll-like receptor proteins (TLRs) detect invading bacteria and other pathogens in the air by attaching to their trace byproducts. Once a threat is identified, the receptors stimulate the epithelial cells to produce antibiotic proteins, such as HBD2 and MBL, to fight the invading organisms. This innate response helps prevent airborne bacteria or fungi from settling in the nose and sinus cavities, causing infection.
'Colonization with microorganisms is a common problem in patients with chronic sinusitis and polyps, but the reasons for this are incompletely understood,' says Andrew Lane, M.D., an associate professor at The Johns Hopkins University School of Medicine and director of its rhinology and sinus surgery center. 'Now we are uncovering new clues as to what might be wrong and perhaps, ultimately, how it might be treated.
'The nose's first line of defense is the epithelium, and when the local innate immune function is curtailed, infections can get a head start, which might serve to worsen the sinus inflammation.
'The potential is there to manipulate these chemical receptors and proteins to see if this makes patients more responsive to conventional therapy,' says Lane.
The study, led by Lane, was believed to be the first to determine levels of each TLR - there are 10 - by directly measuring messenger RNA expression in sinusitis patients and those more fortunate to not have it. Scientists have known for more than a year that TLRs were present in both the healthy and sinusitis-wracked nose, but not which receptors or proteins were more important than others in the condition's chronic form. That study involved 30 men and women, mostly from the Baltimore region, who had surgery for chronic sinusitis at Hopkins. (Another 10 had no sinus problem and served as study controls.)
Those who underwent surgery did so after standard therapy using antibiotics, decongestants and steroids had faPage: 1 2 3 Related medicine news :1
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