Over-expression of neuropeptide urocortin and its receptors in human allergic nasal mucosa.
OBJECTIVE
Urocortin (UCN) is a member of the corticotropin releasing factor (CRF) neuropeptide family. UCN act as locally expressed proinflammatory factor and induce mast cell degranulation, cytokine secretion, and trigger vascular permeability, which are mediated by CRF receptors in peripheral tissues. Considering its functional roles, UCN and its receptors may play a role in the pathogenesis of allergic nasal mucosa. Therefore, we investigated the expression profile and distribution of UCN and CRF receptors in normal and allergic nasal mucosa.


METHODS
Reverse transcriptase-polymerase chain reaction, immunohistochemistry, and Western blotting were applied to the normal and allergic nasal mucosa.


RESULTS
The expression levels of UCN and CRF receptors were increased in allergic nasal mucosa in comparison with normal nasal mucosa. In normal nasal mucosa, UCN and CRF receptors were restricted to the vascular endothelium of submucosal cavernous sinusoids where faint staining was found. However, in allergic nasal mucosa, UCN was expressed in small vessels distributed in lamina propria and the vascular endothelium of cavernous sinusoid located in submucosa. Many scattered positive cells were also found in allergic nasal mucosa, probably UCN-positive leukocytes. CRF receptors were also localized in the vascular endothelium of small vessels and cavernous sinusoid.


CONCLUSIONS
These results indicate that UCN may play a role in the regulation of vascular swelling in normal nasal mucosa. Moreover, in allergic nasal mucosa, increased expression levels of UCN and its receptors may contribute to increased mucosal swelling and vascular permeability, playing an important role in the pathogenesis of allergic rhinitis.
Kim
Tae Hoon
TH
Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Korea University, SungBuk-Ku, Seoul, South Korea.
Lee
Sang Hag
SH
Lee
Heung Man
HM
Lee
Seung Hoon
SH
Lee
Se Woo
SW
Kim
Woo Joo
WJ
Park
Se Jin
SJ
Kim
Yang Soo
YS
Choe
Hwan
H
Hwang
Ho Yeon
HY
Yoo
Ik One
IO
D000328:Adult; D015153:Blotting, Western; D017931:DNA Primers / Q000235:genetics; D005260:Female; D015870:Gene Expression / Q000235:genetics; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D009297:Nasal Mucosa / Q000378:metabolism* / Q000473:pathology; D018019:Receptors, Corticotropin-Releasing Hormone / Q000235:genetics* / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012221:Rhinitis, Allergic, Perennial / Q000235:genetics* / Q000378:metabolism* / Q000473:pathology; D014420:Turbinates / Q000378:metabolism / Q000473:pathology; D054832:Urocortins / Q000235:genetics* / Q000378:metabolism*; D000099052:CRF Receptor, Type 1
C101531:CRF receptor type 2; D017931:DNA Primers; D018019:Receptors, Corticotropin-Releasing Hormone; D054832:Urocortins; D000099052:CRF Receptor, Type 1