Cough Clinical Trial
The aim of this study is described as follows,
1. To establish a validated method to test cough reflex sensitivity conducted by transient
receptor potential vanilloid 1(TRPV1).
2. To observe the variance of cough reflex sensitivity conducted by transient receptor
potential ankyrin 1(TRPA1) of chronic patients and the relationship between cough
reflex sensitivity conducted by TRPA1 and conducted by TRPV1.
3. To study the distribution of TRPA1 and TRPV1 channels and their relationship to cough
reflex sensitivity.
This study is divided into two major part, Firstly,to observe the variance of cough reflex
sensitivity of chronic cough patients and the relationship between it and airway
inflammation.
1. Recruit chronic cough patients and healthy volunteers as subjects.
2. Help subjects to complete detailed history,physical examination,Hull airway reflux
questionnaire,chest x-rays,induced sputum,blood routine test,pulmonary ventilation
function test and histamine provocation test before they enter this study.
3. Complete allyl isothiocynate(AITC) cough provocation test the day subjects enter the
study,then complete capsaicin（CAP）cough provocation test after 3 days.
4. To detect the substance P(SP),calcitonin gene-related peptide(CGRP),prostaglandin
E2(PGE2),et al level in sputum supernatants.
Secondly,to observe the distribution of TRPA1,TRPV1 channels and the relationship between it
and cough reflex sensitivity.
1）Recruit chronic cough patients and healthy volunteers and complete related examinations as
mentioned before.
2)Collect mucosa specimens from upper trachea via endobronchial biopsy,and airway epithelial
cells from 2nd or 3rd order bronchi via brushing.
3)Evaluate the expression level of TRPA1,TRPV1 of mucosa specimens of subjects by
immunofluorescent assay and Image analysis software.
4)Cultivate airway epithelial cells from subjects and evaluate the expression of TRPV1,TRPA1
and functional changes of it.
;
Observational Model: Case Control
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