Bioactive Constituents and Medicinal Importance of Genus Alnus
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PHCOG REV. REVIEW ARTICLE Bioactive constituents and medicinal importance of genus Alnus Sushil Chandra Sati, Nitin Sati1, O. P. Sati, Department of Chemistry, 1Pharmaceutical Sciences, H.N.B. Garhwal University, Srinagar Garhwal, Uttarakhand, India Submitted: 19-08-2010 Revised: 22-02-2011 Published: 23-12-2011 ABSTRACT The genus Alnus has been reviewed for its chemical constituents and biological activities including traditional importance of some common species. The plants of this genus contain terpenoids, fl avonoids, diarylheptanoids, phenols, steroids, and tannins. Diarylheptanoids are the dominant constituents within the genus Alnus, few of them exhibited antioxidant effects and inhibitory activity against nuclear factor kappaB activation, nitric oxide and tumor necrosis factor-α production, human umbilical vein endothelial cells, farnesyl protein transferase, cell-mediated low-density lipoprotein oxidation, HIF-1 in AGS cells, and the HIV-1-induced cytopathic effect in MT-4 cells. Some ellagitannines showed hepatoprotective activity even in a dose of 1 mg/kg which is ten-fold smaller compared with the dose of traditional fl avonoid-based drugs. The members of genus Alnus are well known for their traditional uses in the treatment of various diseases like cancer, hepatitis, infl ammation of uterus, uterine cancer, rheumatism, dysentery, stomachache, diarrhea, fever, etc. The aim of the present review is to summarize the various researches related to the chemistry and pharmacology of genus Alnus. Key words: Alnus, antioxidant effects, diarylheptanoids, HIV-I, inhibitory activity INTRODUCTION The plants of this genus have been found active against many live-threatening disorders like hepatitis, HIV-1 viral replication, Betulaceae or the Birch family includes six genera of deciduous and cancer. The aim of the present review is to delineate the nut-bearing trees and shrubs, including the birches, alders, hazels, various plants with their chemical constituents and biological hornbeams, and hop-hornbeams, numbering about 130 species. activities. Various traditional uses of some common species These are mostly natives of the temperate Northern Hemisphere, have also been summarized. These informations can create with a few species reaching the Southern Hemisphere in the a center of attention for scientists and herbologists for this Andes in South America. Alnus (alders) is an important genus genus, and consequently this database might play a major role belonging to Betulaceae which comprises 30 species worldwide. in future research. [1,2] Almost all plants of this genus have been traditionally used as folk medicine in Ayurveda, Unani, and Chinese medical systems. TRADITIONAL USES OF ALNUS SPECIES OBJECTIVES OF THE REVIEW The members of genus Alnus are well known for their traditional medicinal values. These have been used for the Alnus is one of the genera having potential medicinal values. treatment of various diseases including cancer and as an Address for correspondence: alterative, astringent, cathartic, emetic, febrifuge, galactogogue, Dr. Sushil Chandra Sati, hemostatic, parasiticide, skin tonic, vermifuge, etc. Alnus japonica Department of Chemistry, H.N.B. Garhwal University, is a popular folk medicine in Korea for cancer and hepatitis.[3] Srinagar Garhwal, Uttarakhand, India. E-mail: [email protected] The bark of Alnus glutinosa is alterative, astringent, cathartic, febrifuge, tonic, and useful in mouth and throat infl ammations, Access this article online the vinegar extract of inner bark of plant produces a useful Quick Response Code: wash to treat lice and a range of skin problems such as scabies Website: and scabs.[4-6] The leaf, roots, and bark of A. nepalensis are used www.phcogrev.com in dysentery, stomach ache, and diarrhea in Indian system of medicine (Ayurveda).[7] A decoction of the root of A. DOI: nepalensis is prescribed to treat diarrhea and paste from the 10.4103/0973-7847.91115 leaves is applied on cuts and wounds as a hemostatic.[8] The mixture of leaves of Alnus jorullensis and branches of Polylepis 174 Pharmacognosy Reviews | July-December 2011 | Vol 5 | Issue 10 Sati, et al.: Bioactive constituent and medicinal importance of genus Alnus racemosa R. et P is used to treat infl ammation of uterus, uterine dien-3-oic acid (14); (23E)-(20S)-20,25,26-trihydroxy-3,4- cancer, and rheumatism.[9] The bark of Alnus hirsuta is used in secodammara-4(28),23-dien-3-oic acid (15); (23E)-(12R,20S)- Korean and Chinese traditional medicine as remedies for fever, 12,20,25-trihydroxy-3,4-secodammara-4(28),23-dien-3-oic acid hemorrhage, alcoholism, and diarrhea.[10,11] The decoction of (16); hirsutanonol 5-O-(6-O-galloyl)-β-D-glucopyranoside A. glutinosa barks is used to treat swelling, infl ammation, and (17); 3-deoxo-hisutanonol 5-O-β-D-gucopyranoside (18); rheumatism. [12] It has also been used as an astringent, bitter, hirsutanonol (19); hirsutanonol 5-O-β-D-glucopyranoside emetic, and hemostatic, and for the treatment of sore throat (20); 3-deoxo-hisutanonol 5-O-(6-O- β-D-apiosyl)- β-D- and pharyngitis.[13,14] Contemporary indigenous healers used the glucopyranoside (21); hirsutenone (22); 7-(3,4-dihydroxyphenyl)- bark of Alnus rubra for various medicinal teas.[15,16] 5-hydroxy-1-(4-hydroxyphenyl)-3-heptanone-5-O-β–D- xylopyranoside (23); 1-(3,4-dihydroxyphenyl)-5-hydroxy-7- CHEMICAL CONSTITUENTS OF GENUS ALNUS (4-hydroxyphenyl)-3-heptanone-5-O-β–D-xylopyranoside (24); 1,7-bis-(3,4-dihydroxyphenyl)-5-hydroxy-3-heptanone- The plants of the genus Alnus contain various types of 5-O-[2-(2-methylbutenoyl)]-β–D-xylopyranoside (25); plant secondary metabolites including terpenoids, fl avonoids, 1,7-bis-(3,4-dihydroxyphenyl)-5-methoxy-3-heptanone (26); diarylheptanoids, phenols, steroids, tannins, and many others. The oregonin (27); β-amyrin (28); 3-O-acetyl- β-amyrin (29); plants and their chemical constituents have been summarized below, 3-O-acetyltaraxerol (30); glutinone (31), lupenone (32); quercitin whereas the chemical structures of various compounds isolated (33); 5-O-methylhirsutanonol (34); glutinol (35); taraxerone (36); alnusjaponins A (37); alnusjaponins B (38); 5-O-galloyl-( )- from different parts of genus Alnus are drawn in Figures 1 to 8. ‾ shikimic acid (39); 2,3-(S)-hexahydroxydiphenoyl-D-glucose Chemical constituents of Alnus japonica (40); 4,6-di-O-galloyl-D-glucose (41); 1,4-di-O-galloyl- β Luteolin 7,4’-dimethyl ether (pillion) (1); scutellarein-6,7,4’- -D-glucose (42); 4,6-(S)-valoneoyl-D-glucose (43); strictinin trimethyl ether (salvigenin) (2); kaempferide (3); isohamnetin (44); gemin D (45); pedunculagin (46); praecoxin A (47); (4); rhamnazin (5); quercetin-7,3’,4’-trimethyl ether (6); the fl osin A (48); stachyurin (49); casuarinin (50); 1,7-bis-(3,4- 3,6,4’-trimethyl ether of 6-hydroxy-kaempferol (7); acacetin dihydroxyphenyl)-heptane-3-O-β-D-glucopyranosyl(1→3)- (8); apigenin-7,4’-dimethyl ether (9); scutellarein-6,4’-dimethyl β-D-xylopyranoside (51); 1,7-bis-(3,4-dihydroxyphenyl)- ether (10); methyl (24E)-3,4-secodammara-4(28),20,24- heptane-3-O-β-D-apiofuranosyl(1→6)-β-D-glucopyranoside trien-26-oic acid-3-oate (11); (24E)-3,4-secodammara- (52); 1,7-bis-(3,4-dihydroxyphenyl)-heptane-5-O-β-D- 4(28),20,24-trien-3,26-dioic acid (12); (20S,24S)-20,24- glucopyranoside (53); 1,7-bis-(3,4-dihydroxyphenyl)-5- dihydroxy-3,4-secodammara-4(28),23-dien-3-oic acid (13); hydroxyheptane (54); 1,7-bis-(3,4-dihydroxyphenyl)-heptane- (23E)-(20S)-20,25-dihydroxy-3,4-secodammara-4(28),23- 3-one-5-O-β-D-glucopyranoside (55); platyphylloside (56); 26 24 21 R2 R3 R 21 CO R 1 R2 R 2 2 O OR 3 HO 26 2' 1' 2 2" OH 20 25 24 19 OH OH , 20 25 R1 R3 12 , 1 3 7 1" H xyl OH 27 12 23 27 24 OH xyl H 3 4' 4" 1 3 R1O2C 1 6" 25 OH R* OH R1O2C HO 2 OH R* = xyl -CO-CHCH3 11 R1 =Me, R2 = H 5" 26 OH CH3 OH 12 R = R = H 29 4 1 2 29 CH2CH3 55 OH glc OH 4 13 R1 = R2 = H, R3= OH H xyl H 153 28 28 R1 R2 R R R5OH2C 3 4 R5 O R4O 21 40 H (S)HHDP HH R3O OR1 24 26 HO CH R OR2 23 2 4 H H G COOH 41 H G R R3 20 2 OH O C C O 42 G HHG H 12 27 3 1 HO OH R1O2C 44 G HH(S)HHDP GO OH 14 R1 = R2 = R3= R4 = H 45 H H G (S)HHDP HO OH HO OH 29 4 15 R1 = R2 = R3= H, R4 = OH OH HO (S)HHDP 16 R1 = R3 = R4 = H, R2 = OH 46 H (S)HHDP (S)HHDP 39 28 28 OH 5' 5" OH HO HO 6' 6" 4" 4' 17 R = 6-O-galloyl--D-glucopyranosyl 2 4 6 20 R = -D-glucopyranosyl HO COOH 3' 1' 1 3 5 7 1" 3" OH HO O 2' 2" O H OH OR HO 5' 5" HO OH O HO O 6' 6" 4" 4' C C OCH2 21 R = 6-O-aplosyl- -D-glucopyranosyl HO HO O O 2 4 6 18 R = -D-glucopyranosyl O CH2 HO 1 3 5 7 C O HO 3' 1' 1" 3" OH HO O OH 2' O 2" O O O C O H O OH OR C O C O O HO O C O HO C O 2' 1' 2" OH OH HOOC R1 R R R 1 3 7 1" 2 1 2 22 OH OH HO OH HO OH H 88 H OH 4' 4" OMe 77 H HO OH HO OH HO OH HO 6" OH HO HO OH 5" 48 47 Figure 1: Chemical structures of compounds isolated from genus Alnus Figure 2: Chemical structures of compounds isolated from genus Alnus Pharmacognosy Reviews | July-December 2011 | Vol 5 | Issue 10 175 Sati, et al.: Bioactive constituent and medicinal importance of genus Alnus OH O H OH OH HO OH O OH OH 5 6' 1' 1 3 9 5 6' 1' 1 3 OH HO 5 R1 5' 2' 6 5' 2' R 6 2 C=O 3' 5" 6" 5" 6" 1 OH HO COOH 3' C 4' 4' O 7 OH O O 1" 1" 7 H3CO O HO O 4" 4" HO O HO O H HO 14 2" 2" H O O 3" 3" O H CO H CO 3 OH 3 79 OH 57 C OCH2 78 HO C H OG HO O HO C O CH2 HO C O HO OH O O OH 29 30 O 49 R1 = OH, R2 = H HO 50 R1 = H, R2 = OH HO 43 21 5 OH OH 25 27 19 9 26 R 1 22 OH 16 10 15 25 26 HO 28 7 27 O OH 3 16 1 6 1 C HO OH HO 10 15 O HO O 7 CH2 O 23 24 6 73 R = OCOCH3 14 O C HO OH 75 R = CH2OH 74 R = OH C O O 76 R = COOH R O HO OH 23 24 58