Skip to main content
Log in

Coleus barbatus (C.forskohlii)(Lamiaceae) and the potential new drug forskolin (Coleonol)

  • Published:
Economic Botany Aims and scope Submit manuscript

Abstract

Coleus barbatus (C. forskohlii) is used medicinally in Africa, Arabia, and Brazil. The root tubers of the plant are prepared and eaten as a condiment in India. Other Indian Coleus spp. are used in traditional Ayurvedic healing. Chemical studies of alcoholic extracts of the tubers of C. barbatus led to isolation of the labdane diterpene forskolin (coleonol), which has become an important research tool in studying the roles of the enzyme adenylate cyclase and cyclic-AMP in cellular physiology. The compound may eventually become a useful drug in treating hypertension, glaucoma, asthma, and certain cancers. This article summarizes the investigations ofC. barbatus.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Similar content being viewed by others

Literature Cited

  • Agarwal, K. C., and R. E. Parks, Jr. 1982. Synergistic inhibition of platelet aggregation by forskolin plus PGE1 or 2-fluoroadenosine: effects of 2′,5′-dideoxyadenosine and 5-methylthioadenosine. Biochem. Pharmacol. 31:3713–3716.

    Article  PubMed  CAS  Google Scholar 

  • —, Jr.. 1983. Forskolin: a potential antimetastatic agent. Int. J. Cancer 32:801–804.

    Article  PubMed  CAS  Google Scholar 

  • Anonymous. 1950. Coleus. Pages 308-309in The wealth of India, vol. II. Council of Scientific and Industrial Research, Delhi.

  • Badhwar, S. R. L., and R. R. Fernandez. 1964. Edible wild plants of the Himalayas. The Forest Research Institute and Colleges, Dehra Dun, India.

    Google Scholar 

  • Baraldi, P. G., A. Barco, S. Benetti, G. P. Pollini, E. Polo, and D. Simoni. 1986. The intramolecular nitrile oxide route to forskolin. J. Chem. Soc, Chem. Commun. 1986:757–758.

    Article  Google Scholar 

  • Bentham, G. 1832–1836. VIII.Coleus. Pages 47–59, 711in Labiatarum genera et species. Ridgway and Sons, London.

    Google Scholar 

  • Bhakuni, D. S., M. L. Dhar, M. M. Dhar, B. N. Dhawan, B. Gupta, and R. C. Srimal. 1971. Screening of Indian plants for biological activity: part III. Indian J. Exp. Biol. 9:91–102.

    PubMed  CAS  Google Scholar 

  • Bhat, S. V., B. S. Bajwa, H. Dornauer, and N. J. de Souza. 1977. Structures and stereochemistry of new labdane diterpenoids fromColeus forskohlii Briq. Tetrahedron Lett. 1977:1669–1672.

    Article  Google Scholar 

  • —, A. N. Dohadwalla, B. S. Bajwa, N. K. Dadkar, H. Dornauer, and N. J. de Souza. 1983. The antihypertensive and positive inotropic diterpene forskolin: effects of structural modifications on its activity. J. Med. Chem. 26:486–492.

    Article  PubMed  CAS  Google Scholar 

  • Briquet, J. 1897. Labiatae (Coleus). Pages 359-363in A. Engler and K. Prantl, ed., Die Natiirlichen Pflanzenfamilien IV. 3a.

  • Bristow, M. R., R. Ginsburg, A. Strosberg, W. Montgomery, and W. Minobe. 1984. Pharmacology and inotropic potential of forskolin in the human heart. J. Clin. Invest. 74:212–223.

    Article  PubMed  CAS  Google Scholar 

  • Bruka, J. F. 1983. Effects of selected bronchodilators on antigen- and A23187-induced contraction of guinea-pig trachea. J. Pharmacol. Exp. Therap. 225:427–435.

    Google Scholar 

  • Burstein, N. R., M. L. Sears, and A. Mead. 1984. Aqueous flow in human eyes is reduced by forskolin, a potent adenylate cyclase activator. Exp. Eye Res. 39:745–749.

    Article  PubMed  CAS  Google Scholar 

  • Caprioli, J., and M. Sears. 1983. Forskolin lowers intraocular pressure in rabbits, monkeys and man. The Lancet 30 April:958–960.

    Google Scholar 

  • Cook, T. 1903. XCVIII. Labiatae. Pages 448–449in The flora of the Presidency of Bombay, vol. II. Botanical Survey of India, Calcutta.

    Google Scholar 

  • Cramer, L. H. 1978. A revision ofColeus (Labiatae) in Sri Lanka (Ceylon). Kew Bull. 32:551–561.

    Article  Google Scholar 

  • —. 1981.Coleus barbatus. Pages 141–143in M. D. Dassanayake, ed., A revised handbook to the flora of Ceylon, vol. III. Amerind Pub. Co., New Delhi.

    Google Scholar 

  • Croom, E. M., Jr. 1983. Documenting and evaluating herbal remedies. Econ. Bot. 37:13–27.

    Google Scholar 

  • de Souza, N. J., A. N. Dohadwalla, and J. Reden. 1983. Forskolin: a labdane diterpenoid with antihypertensive, positive inotropic, platelet aggregation inhibitory, and adenylate cyclase activating properties. Med. Res. Rev. 3:201–219.

    Article  PubMed  Google Scholar 

  • Dragendorff, G. 1898. Pages 585–586in Die Heilpflanzen der verscheidenen Volker und Zeiten. Ferdinand Enke, Stuttgart.

    Google Scholar 

  • Dubey, M. P., R. C. Srimal, S. Nityanand, and B. N. Dhawan. 1981. Pharmacological studies on coleonol, a hypotensive diterpene fromColeus forskohlii. J. Ethnopharmacol.3:1–13.

    Article  PubMed  CAS  Google Scholar 

  • Harada, N., and K. Nakanishi. 1983. Circular dichroic spectroscopy-exciton chirality in organic stereochemistry. University Science Books, Mill Valley, CA.

    Google Scholar 

  • Hooker, J. D. 1885. CXII. Labiatae. Pages 624–627in The flora of British India, vol. 4. Reeve & Co., London.

    Google Scholar 

  • Jenkins, P. R., K. A. Menear, P. Barraclough, and M. S. Nobbs. 1984. An intramolecular Diels-Alder approach to forskolin. J. Chem. Soc, Chem. Commun. 1984:1423–1424.

    Article  Google Scholar 

  • Kelecom, A. 1983. Isolation, structure determination, and absolute configuration of barbatusol, a new bioactive diterpene with a rearranged abietane skeleton from the labiate Coleus barbatus. Tetrahedron 39:3603–3608.

    Article  CAS  Google Scholar 

  • —. 1984. An abietane diterpene from the labiateColeus barbatus. Phytochemistry 23:1677–1679.

    Article  CAS  Google Scholar 

  • Kreig, M. B. 1964. 13. Rauwolfia, the Park Avenue snakeroot. Pages 317–339in Green medicine. Rand McNally & Co., New York.

    Google Scholar 

  • Lichey, J., T. Friedrich, M. Priesnitz, G. Biamino, P. Usinger, and H. Huckauf. 1984. Effect of forskolin on methacholine-induced bronchoconstriction in extrinsic asthmatics. The Lancet 21 July: 167.

    Google Scholar 

  • Nadkarni, K. M. 1955. Indian materia medica, 3rd ed. 2 vol., rev. by A. K. Nadkarni. Popular Book Depot, Bombay, India.

    Google Scholar 

  • Nicolau, K. C, and W. S. Li. 1985. An intramolecular Diels-Alder strategy to forskolin. J. Chem. Soc, Chem. Commun. 1985:421.

    Article  Google Scholar 

  • Paulus, E. F. 1979. Molecular and crystal structure of forskolin. Z. Kristallogr. 152:239–245.

    Google Scholar 

  • Ruedi, P., and C. H. Eugster. 1972. Struktur von Coleon E, einem neuen diterpenoiden Methylenchinon aus derColeus-barbatus-gruppe (Labiatae). Helv. Chim. Acta 55:1994–2014.

    Article  CAS  Google Scholar 

  • —. 1973. Struktur von Coleon F. Helv. Chim. Acta 56:1129–1132.

    Article  CAS  Google Scholar 

  • Saksena, A. K., M. J. Green, H.-J. Shue, J. K. Wong, and A. T. McPhail. 1985. Identity of coleonol with forskolin: Structure revision of a base-catalysed rearrangement product. Tetrahedron Lett. 26:551–554.

    Article  CAS  Google Scholar 

  • Seamon, K. B. 1984. Forskolin and adenylate cyclase: new opportunities in drug design. Pages 293–302in D. M. Bailey, ed., Annual reports in medicinal chemistry, vol. 19. Academic Press, New York.

    Google Scholar 

  • —, and J. W. Daly. 1981. Forskolin: a unique diterpene activator of cyclic AMP-generating systems. J. Cyclic Nucleotide Res. 7:201–224.

    PubMed  CAS  Google Scholar 

  • — 1983. Forskolin, cyclic AMP and cellular physiology. TIPS (Trends in Pharmacol. Sci.) 4:120–123.

    CAS  Google Scholar 

  • —, H. Metzger, N. J. de Souza, and J. Reden. 1983. Structure-activity relationships for activation of adenylate cyclase by the diterpene forskolin and its derivatives. J. Med. Chem. 26:436–439.

    Article  PubMed  CAS  Google Scholar 

  • Shah, V., S. V. Bhat, B. S. Bajwa, H. Domauer, and N. J. de Souza. 1980. The occurrence of forskolin in the Labiatae. Pl. Med. 42:183–185.

    Article  Google Scholar 

  • Sims, J. 1819.Plectranthus forskohlaei. Bot. Mag. 46:t. 2036.

    Google Scholar 

  • —. 1822.Plectranthus comosus. Bot. Mag. 49:t. 2318.

    Google Scholar 

  • Tandon, J. S., M. M. Dhar, S. Ramakumar, and K. Venkatesan. 1977. Structure of coleonol, a biologically active diterpene fromColeus forskohlii. Indian J. Chem. 15B:880–883.

    CAS  Google Scholar 

  • —, S. B. Katti, P. Ruedi, and C. H. Eugster. 1979. Crocetin-dialdehyde fromColeus forskohlii Briq., Labiatae. Helv. Chim. Acta 62:2706–2707.

    Article  CAS  Google Scholar 

  • Trease, G. E., and W. C. Evans. 1983. Pharmacognosy, 12th ed. Bailliere Tindall, London.

    Google Scholar 

  • Tyler, V. E., L. R. Brady, and J. E. Robbers. 1981. Pharmacognosy, 8th ed. Lea & Febiger, Philadelphia.

    Google Scholar 

  • Voigt, J. O. 1845. Pages 449–450in Hortus suburbanus Calcuttensis (a Catalogue of the Plants at the East India Company and Seramapore Botanical Gardens, 1786–1841). Bishop’s College Press, Calcutta.

    Google Scholar 

  • Wang, A. H.-J., I. C. Paul, R. Zelnik, D. Lavie, and E. C. Levy. 1974. Structure and stereochemistry of cyclobutatusin, a diterpenoid containing a four-membered ring. J. Amer. Chem. Soc. 96:580–581.

    Article  CAS  Google Scholar 

  • Willemse, R. H. 1985. Notes on EastAfrican Plectranthus species (Labiatae). Kew Bull. 40:93–96.

    Article  Google Scholar 

  • Zelnik, R., D. Lavie, E. C. Levy, A. H.-J. Wang, and I. C. Paul. 1977. Barbatusin and cyclobutatusin, two novel diterpenoids fromColeus barbatus Bentham. Tetrahedron 33:1457–1467.

    Article  CAS  Google Scholar 

  • Ziegler, F. E., B. H. Jaynes, and M. Saindane. 1985. A C6C7 oxygen functionalized intermediate for the synthesis of forskolin: stereochemical control in an intermolecular Diels-Alder reaction. Tetrahedron Lett. 26:3307–3310.

    Article  CAS  Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Rights and permissions

Reprints and permissions

About this article

Cite this article

ValdÉs, L.J., Mislankar, S.G. & Paul, A.G. Coleus barbatus (C.forskohlii)(Lamiaceae) and the potential new drug forskolin (Coleonol). Econ Bot 41, 474–483 (1987). https://doi.org/10.1007/BF02908139

Download citation

  • Received:

  • Accepted:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF02908139

Keywords

Navigation