Antihistaminic and antiviral activities of steroids of Turbinaria conoides

• Published in: Nationalities papers Vol. 25; no. 7; pp. 723 - 729
• Main Authors: Kumar, S. Sadish, Kumar, Y., Khan, M.S.Y., Anbu, J., De Clercq, E.
• Format: Journal Article
• Language: English
• Published: England Taylor & Francis Group 01-04-2011
• Subjects: 14,15,18,20-diepoxyturbinarin; 3,6,17-trihydroxy-stigmasta-4,7,24-triene; Animal models; Animals; antihistaminic; Antimicrobial activity; Antineoplastic Agents, Phytogenic - chemistry; Antineoplastic Agents, Phytogenic - isolation & purification; Antineoplastic Agents, Phytogenic - pharmacology; antiviral; Antiviral activity; Antiviral Agents - isolation & purification; Antiviral Agents - pharmacology; Cats; Cell Line; Colorimetry; Corticotropin-releasing hormone; Cyclohexane; Cytotoxicity; Histamine; Histamine Antagonists - isolation & purification; Histamine Antagonists - pharmacology; Kidney; Phaeophyceae - chemistry; Spiro Compounds - isolation & purification; Spiro Compounds - pharmacology; steroid; Steroid hormones; Steroids - chemistry; Steroids - isolation & purification; Steroids - pharmacology; Stigmasterol - analogs & derivatives; Stigmasterol - isolation & purification; Stigmasterol - pharmacology; Turbinaria conoides
• ISSN: 1478-6419; 0090-5992; 1478-6427; 1465-3923
• DOI: 10.1080/14786411003781515

The steroids 3,6,17-trihydroxy-stigmasta-4,7,24(28)-triene (A) and 14,15,18,20-diepoxyturbinarin (B) were isolated from the cyclohexane extract of brown alga, Turbinaria conoides (J. Agardh) Kutzing, and have been reported for their antimicrobial activity by us. In this study, the isolated compounds were evaluated for comprehensive antihistaminic, antiviral and cytotoxicity screening. The antihistaminic study was performed using in vitro standard animal models. Evaluation of the potency (EC
50
), affinity (pA
2
) and the maximal response (E
max
) of the histamine alone and in the presence of the compounds were determined. Antiviral activity and cytotoxicity were performed in Crandell-Rees feline kidney (CRFK) cells by a colorimetric formazan-based MTS assay. No significant antiviral activity or cytotoxicity were observed for the compounds in the CRFK cells. Compound A inhibited the histamine-induced concentration at 20 µg mL
−1
(p < 0.05). The most significant inhibition (97%) was observed for compound B (p < 0.01) at the same concentration, which was comparable to that of the positive control chlorpheniramine maleate (10 µg mL
−1
). This potentiality suggests that 14,15,18,20-diepoxyturbinarin (B) can be developed as a new lead antihistaminic agent.