Bronchodilatory and mast cell stabilising activity of Cressa cretica L.: evaluation through in vivo and in vitro experimental models.
OBJECTIVE
To evaluate the effect of ethylacetate fraction (Fr-Et) and methanolic fraction (Fr-Me) obtained from Cressa cretica L.(C. cretica) L. on experimental models for bronchodilatory activity and mast cell stabilising activity.


METHODS
The effect of Fr-Et and Fr-Me were studied on acetylcholine and histamine aerosol-induced broncospasm using guinea pigs as experimental animals. Also, the effects of these fractions were evaluated on the isolated guinea pig tracheal preparations. Besides this mast cell degranulation effect was assessed using egg albumin and compound 48/80 on rat peritoneal mast cells.


RESULTS
Significant increase in preconvulsion time was observed due to pretreatment with the fractions when guinea pigs were exposed to histamine and acetylcholine aerosol. Fr-Et and Fr-Me significantly increased the preconvulsion in a dose depended manner that suggestive of bronchodilating activity. Fr-Et and Fr-Me exhibited a significant concentration dependant relaxant effect on guinea pig trachea pre-contracted with CCh, K(+) and histamine. The results revealed that Fr-Et to be more potent than Fr-Me in relaxing histamine and K(+) and calcium induced contraction than CCh induced contractions. Studies on the fractions in protecting mast cell degranulation, which were elicited by the egg albumin as well as synthetic compound 48/80 revealed both the fractions significantly protect the mast cell degranulation, which release mediators such as histamine and proinflammatory cytokines through various stimuli in a dose depended manner.


CONCLUSIONS
Thus our study established the bronchodilator activity, and mast cell stabilizing activity which are important mediators that provoke or sustain in asthma.
Govt. Pharmacy Institute, Department of Health and Family Welfare, Govt. of Jharkhand, Ranchi, India. priyashree_lenka@yahoo.com
Sunita
S
Priyashree
S
S
Jha
Shakti Prasad
SP
Pattanayak
D000085:Acetates / Q000494:pharmacology; D000418:Albumins / Q000494:pharmacology; D000818:Animals; D001986:Bronchial Spasm / Q000188:drug therapy*; D001993:Bronchodilator Agents / Q000494:pharmacology*; D027722:Convolvulaceae / Q000737:chemistry*; D006168:Guinea Pigs; D008407:Mast Cells / Q000187:drug effects; D000432:Methanol / Q000494:pharmacology; D008517:Phytotherapy; D010936:Plant Extracts / Q000494:pharmacology*; D051381:Rats; D014132:Trachea / Q000187:drug effects; D003189:p-Methoxy-N-methylphenethylamine / Q000494:pharmacology
D000085:Acetates; D000418:Albumins; D001993:Bronchodilator Agents; D010936:Plant Extracts; D003189:p-Methoxy-N-methylphenethylamine; C007650:ethyl acetate; D000432:Methanol