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Review

Bioactive Steroids and Saponins of the Genus Trillium

by
Shafiq Ur Rahman
1,*,
Muhammad Ismail
2,
Muhammad Khurram
1,
Irfan Ullah
3,
Fazle Rabbi
2 and
Marcello Iriti
4,*
1
Department of Pharmacy, Shaheed Benazir Bhutto University, Sheringal, Dir 18000, Pakistan
2
Department of Pharmacy, University of Peshawar, Peshawar 25120, Pakistan
3
Department of Pharmacy, Sarhad University of Science and Information Technology, Peshawar 25120, Pakistan
4
Department of Agricultural and Environmental Sciences, Milan State University, 20133 Milan, Italy
*
Authors to whom correspondence should be addressed.
Molecules 2017, 22(12), 2156; https://doi.org/10.3390/molecules22122156
Submission received: 17 October 2017 / Revised: 19 November 2017 / Accepted: 1 December 2017 / Published: 5 December 2017
(This article belongs to the Collection Phytochemicals: Biosynthesis, Metabolism and Biological Activities)
Versions Notes

Abstract

:
The species of the genus Trillium (Melanthiaceae alt. Trilliaceae) include perennial herbs with characteristic rhizomes mainly distributed in Asia and North America. Steroids and saponins are the main classes of phytochemicals present in these plants. This review summarizes and discusses the current knowledge on their chemistry, as well as the in vitro and in vivo studies carried out on the extracts, fractions and isolated pure compounds from the different species belonging to this genus, focusing on core biological properties, i.e., cytotoxic, antifungal and anti-inflammatory activities.

1. Introduction

Natural products obtained from plants have played remarkable role in drug discovery and improvement of health care system [1,2,3,4,5,6]. According to the World Health Organization (WHO) estimate, about 80% of world population relies on natural sources for their primary health care need while the remaining 20% of the population uses integrated natural sources [7]. Even at the dawn of 21st century, 11% of the 252 drugs considered as basic and essential by the WHO were exclusively of flowering plants origin [8]. At present, the area of cancer and infectious diseases are mostly dependent on natural products, and among the 175 approved anti-cancer drug molecules, 85 (49%) are either natural products or their derivatives [3].
In scientific literature around the world, more than 35,000 plant species have been reported to be used in different human cultures for medicinal purposes [9]. Nevertheless, this number could be much higher, as knowledge of indigenous use of medicinal plants mainly passes verbally from one generation to another and largely remains undocumented. Among the 250,000 reported higher plant species, only 5–15% has been scrutinized for their bioactive molecules [10]. Therefore, medicinal plants represent an area under focus since their secondary metabolites encompass a significant number of drugs used in current therapeutics and their potential as source of new medicines is beyond any doubts.
Saponins are steroid or triterpene glycosides widely distributed in the plants that possess hemolytic properties and poisonous effects [11]. The aglycone part (sapogenin) of saponins may have steroid or triterpenoid nuclei, based on whom saponins are generally classified. Steroidal saponins are less common and usually found in monocotyledonous plants as compared to triterpenoid saponins, which are extensively distributed and found in dicotyledonous plants [12]. The basic skeleton of steroidal sapogenins (27C) may be either 6-ring spirostane or 5-ring furostane, while triterpenoid sapogenins (30C) are structurally different and often consist of five or rarely four units. In general, at C-3 of aglycone moiety, the glycone (sugar) is attached, including one to several monosaccharide units. The attached sugar chains may be from one to three, either straight, branched or both. The presence of different substituents in the sapogenin as well as the composition, linkage and number of sugar moieties account for structural diversity of saponins [13].
Similarly, the structural complexity of the saponins accounts for their diverse physicochemical, pharmacological and biological properties as well as their commercial relevance as promising molecules with several applications in food, cosmetic, pharmaceutical and health fields [14]. Indeed, saponins have been investigated for the development of new natural medicines and to prove the efficacy of traditional herbal medicines. Crude drugs containing saponins that have less irritating effects following oral administration are generally used as expectorant and antitussive agents [11]. It is worth mentioning that many saponins have been reported to exhibit significant anti-inflammatory, anti-nociceptive, antipyretic, anti-allergic and anti-cancer properties [15,16].
Steroids are a group of secondary metabolites derived from cholesterol, showing diverse chemical structure and biological functions. Almost all steroid molecules possess the same basic perhydroxyl cyclopentenophenanthrene skeleton. The differences in the basic skeleton and the attachment of different groups result in various classes of steroids [17]. Steroids have many pharmacological applications and the research is continuing to find out about these metabolites, as potential lead compounds in drug design and discovery [18]. For instance, ecdysteroids are polyhydroxy steroids produced by certain plants including those belonging to the genus Trillium. Plants containing ecdysteroids possess noticeable pharmacological properties as anabolic, antidiabetic, analgesic, anti-inflammatory and anthelmintic activities [18,19].

2. The Genus Trillium

Trillium is the most important genus belonging to the family Melanthiaceae alt. Trilliaceae. Steven Elliott in 1817 wrote: “The family Trilliaceae is an attractive one. A spiral of leaves at the peak of a stem, sustaining solitary flower; it encloses and covers numerous species”. The genus Trillium consists of perennial herbs with characteristic rhizomes that are horizontal or erect, semierect, branched or faintly unbranched, compressed to shortened, elongated to bulky and fleshy, distal end pointed or premorse; the apex bears large terminal shoot/bud. Stem has leaf-sheaths and brown scales at the base. Leaves are three located at the top of the main stem. Flowers are totally to partly pedicellate, sessile and syncarpous. The genus comprises about forty-eight interrelated species in eastern North America and temperate areas of Asia, as well as in western North America [20]. Most of the Trillium species are related with deciduous forests (Arcto-Tertiary flora), which have continued with remarkable changes in geographical ranges since the early Tertiary period in the northern hemisphere. At present, Trillium species are limited to one of three geographical areas: Asia, western North America and eastern North America [21]. Some important species of the genus Trillium with specific characteristics [22,23,24] are reported in Table 1.

3. Phytochemicals of the Genus Trillium

The genus Trillium is a rich source of bioactive phytochemicals as steroids, saponin derivatives and flavonoids [25,26,27,28,29]. Thus far, several steroidal saponins have been isolated and purified from the plants belonging to this genus and, at present, novel metabolites/phytochemicals from Trillium ssp. are investigating using the latest technologies [30,31,32,33,34]. The secondary metabolites/phytochemicals of species belonging to the genus Trillium are reported in Table 2.

4. Medicinal Importance and Biological Activities of the Genus Trillium

Plant species belonging to the genus Trillium have been extensively used as a remedy for various diseases in different traditional healing systems and several preclinical studies have corroborated these uses. The reported biological/pharmacological activities of different species indicate the promising potential of crude extracts, solvent fractions and isolated pure compounds.
The rhizomes of T. erectum, named beth roots, have been used in folk medicine for the treatment of hemorrhages from uterus, urinary tract and lungs [43]. T. tschonoskii has been traditionally used in China for at least one thousand years [44,45]. Dried rhizomes of this plant species have been used as herbal remedy for treatment of hypertension, neurasthenia, giddiness, headache, removing carbuncles and ameliorating pains [46,47]. The anticancer and pro-apoptotic activities of n-BuOH extract against human lung cancer cells have also been demonstrated [45].
The ethanol, ethyl acetate and butanol extracts of T. tschonoskii significantly suppressed the edema of rat hind paw swelling elicited by injection of carrageenan [48]. Finally, T. tschonoskii improved learning and memory in rats, by enhancing the expression of anti-oxidase enzymes [49].
Ethanol extract from rhizomes and aerial parts of T. grandiflorum exhibited antifungal activity [40]. The rhizome of T. govanianum is commonly known as “matar zela” or “teen patra” in Pakistan, and “nag chatri” in India [19]. In folk medicine, T. govanianum is used to cure dysentery and boils; in wound healing, and menstrual and sexual disorders; and as anti-inflammatory and antiseptic agent [50]. The powdered roots are used as body and sexual tonic [51]. Noteworthy, analgesic, anti-inflammatory, antifungal, free radical scavenging, β-glucuronidase inhibitory activities as well as cytotoxicity against prostate and cervical carcinoma cells of T. govanianum have been recently reported [19,29,50].

5. Bioactivities of the Genus Trillium Phytochemicals

The isolated secondary metabolites of the genus Trillium mostly belong to the chemical class of steroidal saponins and steroids, including ecdysteroids, even if flavonoids and trihydroxy fatty acids have also been reported. The isolated compounds exhibited a remarkable potential when tested in different in vitro and in vivo assays. Thus far, among the tested steroidal saponins, both spirostanol and furostanol saponins, many of them exhibited relevant cytotoxicity against different cancer cell lines, few showed high potential against tested fungal strains, while some of them possessed antioxidant and COX-2 inhibitory activity, as reported in Table 3.
In addition, the biological activities of steroidal saponins mainly depend on their aglycone moieties (steroidal sapogenins) as well as the number and structure of monosaccharide units in their sugar chains. A slight structural diversity endorses a significant difference on their antifungal and cytotoxic properties, i.e., spirostanol saponins exhibit a higher antifungal potential in comparison to their analogous furostanol saponins. Therefore, it is worth mentioning that further detailed studies on the structure–activity relationships (SAR) and molecular/biochemical targets of steroidal saponins are required to explore the therapeutic potential of this important class of natural products as leads for new drug discovery.

6. Conclusions and Future Perspectives

Thus far, more than 40 steroidal saponins having spirostane and furostane type aglycons from the genus Trillium have been isolated. Their structure was determined by the use of spectroscopic techniques, including fast atom bombardment mass spectrometry (FABMS) and extensive 2D nuclear magnetic resonance (NMR) experiments (COSY, TOCSY, NOESY, HSQC, and HMBC). The existing data strongly suggest that plants belonging to the genus Trillium are rich source of steroids and saponins and possess a therapeutic potential in the management of cancers, fungal infections, inflammatory and painful disorders. Noteworthy, most of the plant species are still unexplored, and some are under investigation; therefore, further comprehensive studies are needed to screen new sources of phytochemicals to develop promising phytotherapeutics effective in the treatment of chronic degenerative and infectious diseases. Finally, the most promising Trillium secondary metabolites have to be investigated in humans, in properly designed randomized clinical trials, to reach the highest level of clinical evidence.

Acknowledgments

Authors did not receive any source of funding in support of this study.

Author Contributions

All the authors contributed equally to the manuscript.

Conflicts of Interest

The authors declare no conflict of interest.

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Table
Table 1. Common species of the genus Trillium.
Table 1. Common species of the genus Trillium.
No.Species with Common NameOccurrenceFlowering Period
1Trillium erectum L.
  • Wake robin
  • Red Trillium
North AmericaApril–June
2Trillium nivale Riddell
  • Snow Trillium
  • Dwarf white Trillium
United StatesMarch–April
3Trillium undulatum Willd.
  • Painted Trillium
  • Painted lady
Wisconsin (U.S.)April–June
4Trillium pusillum Michx.
  • Dwarf Trillium
  • Least Trillium
United StatesMarch–May
5Trillium grandiflorum (Michx.) Salisb.
  • Great white Trillium
  • White wake-robin
Mountains of Virginia (U.S.)April–June
6Trillium ovatum Pursh
  • Western white Trillium
North AmericaMarch–May
7Trillium luteum Harb.
  • Yellow Trillium
  • Yellow toadshade
Joseph rivers and elsewhere in Michigan (U.S.)April–May
8Trillium petiolatum Pursh
  • Purple Trillium
  • Round-leaved Trillium
North AmericaApril–May
9Trillium simile Gleason
  • Sweet white Trillium
North AmericaApril–May
10Trillium lancifolium Raf.
  • Lance leaved Trillium
North AmericaFebruary–May
11Trillium kamtschaticum Pall. Ex MiyabeKorea, Japan, Russia, North America, ChinaApril–June
12Trillium tschonoskii Maxim.Bhutan, Japan, Korea, ChinaJuly–August
13Trillium taiwanense S.S.YingTaiwan, ChinaMay–June
14Trillium parviflorum V.G.Sokup
  • Small flowered Trillium
North AmericaMarch–May
15Trillium govanianum Wall.Bhutan, India, Nepal, China, PakistanApril–August
Table
Table 2. List of phytochemicals isolated from genus Trillium.
Table 2. List of phytochemicals isolated from genus Trillium.
SourceChemical NameChemical StructureReferences
T. govanianumSpirost-5-en-3-ol(diosgenin) (compound 1) Molecules 22 02156 i001[28]
T. erectum(25S)-spirost-5-ene-3β,17α,27-triol (compound 2) Molecules 22 02156 i002[26]
T. erectum(25S)-3β,17α-dihydroxyspirost-5-en-27-yl β-d-glucopyranoside (compound 3) Molecules 22 02156 i003[26]
T. erectum(25S)-17α,27-dihydroxyspirost-5-en-3 β-yl β-d-glucopyranoside (compound 4) Molecules 22 02156 i004[26]
T. erectum(25S)-27-[(β-d-glucopyranosyl)oxy]-17α-hydroxyspirost-5-en-3β-yl O α-l-rhamnopyranosyl-(1→2)-β-d-glucopyranoside (compound 5) Molecules 22 02156 i005[26]
T. erectum(25S)-27-[(β-d-glucopyranosyl)oxy]-17α,27-dihydroxyspirost-5-en-3-yl O-(4-O-acetyl-α-l-rhamnopyranosyl)-(1→2)-β-d-glucopyranoside (compound 6) Molecules 22 02156 i006[26]
T. erectum(25S)-27-[(β-d-glucopyranosyl)oxy]-17α,27-dihydroxyspirost-5-en-3β-d-glucopyranosyl-(1→6)-O-[α-l-rhamnopyranosyl-(1→2)]-β-d-glucopyranoside (compound 7) Molecules 22 02156 i007[26]
T. erectum(25S)-17α,27-dihydroxyspirost-5-en-3β-yl O-(4-O-acetyl-α-l-rhamnopyranosyl)-(1→2)-β-d-glucopyranoside (compound 8) Molecules 22 02156 i008[26]
T. erectum(25R)-17α-hydroxyspirost-5-en-3β-yl O-α-l-rhamnopyranosyl-(1→4)-O-[α-l-rhamnopyranosyl-(1→4)]-β-d-glucopyranoside (compound 9) Molecules 22 02156 i009[26]
T. erectum(25R)-26-[(β-d-glucopyranosyl)oxy]-22α-methoxyfurost-5-en-3β-yl O-α-l-rhamnopyranosyl-(1→2)-O-[α-l-rhamnopyranosyl-(1→4)]-β-d-glucopyranoside (compound 10) Molecules 22 02156 i010[26]
T. kamtschaticum(25S)-17α,27-dihydroxyspirost-5-en-3β-yl O-α-l-rhamnopyranosyl-(1→2)-β-d-glucopyranoside (compound 11) Molecules 22 02156 i011[35]
Trillium kamtschaticum(25R)-17α-hydroxyspirost-5-en-3 β-yl O-α-l-rhamnopyranosyl-(1→2)-β-d-glucopyranoside (compound 12) Molecules 22 02156 i012[36]
T. kamtschaticum(25R)-17α-hydroxyspirost-5-en-3β-yl O-α-l-rhamnopyranosyl-(1→4)-β-d-glucopyranoside (compound 13) Molecules 22 02156 i013[36]
T. kamtschaticum(25R)-17α-hydroxyspirost-5-en-3β-yl O-α-l-rhamnopyranosyl-(1→2)-O-[α-l-rhamnopyranosyl-(1→4)]-β-d-glucopyranoside (compound 14) Molecules 22 02156 i014[36]
T. kamtschaticum(25R)-17α-hydroxyspirost-5-en-3β-yl O-α-l-rhamnopyranosyl-(1→2)-O-[O-α-l-rhamnopyranosyl-(1→4)-a-l-rhamnopyranosyl-(1→4)]-α-d-glucopyranoside (compound 15) Molecules 22 02156 i015[36]
T. kamtschaticum(25R)-spirost-5-en-3β-yl O-α-l-rhamnopyranosyl-(1→2)-β-d-glucopyranoside (compound 16) Molecules 22 02156 i016[36]
T. kamtschaticum(25R)-spirost-5-en-3β-yl O-α-l-rhamnopyranosyl-(1→2)-O-[α-l-rhamnopyranosyl-(1→4)]-β-d-glucopyranoside (compound 17) Molecules 22 02156 i017[36]
T. kamtschaticum(25R)-spirost-5-en-3β-yl O-α-l-rhamnopyranosyl-(1→2)-O-[O-α-l-rhamnopyranosyl-(1→4)-α-Lrhamnopyranosyl-(1→4)]-β-d-glucopyranoside (compound 18) Molecules 22 02156 i018[36]
T. kamtschaticum
T. erectum		(25R)-26-[(β-d-glucopyranosyl)oxy]-17α-hydroxy-22β-methoxyfurost-5-en-3β-yl O-α-l-rhamnopyranosyl-(1→2)-β-d-glucopyranoside (compound 19) Molecules 22 02156 i019[26,37]
T. kamtschaticum
T. erectum		(25R)-26-[(β-d-glucopyranosyl)oxy]-17α-hydroxy-22-amethoxyfurost-5-en-3β-yl O-α-l-rhamnopyranosyl-(1→2)-O-[α-l-rhamnopyranosyl-(1→4)]-β-d-glucopyranoside (compound 20) Molecules 22 02156 i020[26,37]
T kamtschaticum(25R)-26-[(β-d-glucopyranosyl)oxy]-3β-[(O-α-l-rhamnopyranosyl-(1→2)-β-d-glucopyranosyl)oxy]-cholesta-5,17-diene-16,22-dione (compound 21) Molecules 22 02156 i021[36]
T. kamtschaticum(25R)-27-hydroxypenogenin 3-O-α-l-rhamnopyranosyl-(1→2)-O-β-d-glucopyranoside (compound 22) Molecules 22 02156 i022[35]
T. kamtschaticumPenogenin 3-O-α-l-rhamnopyranosyl-(1→2)-O-β-d-glucopyranoside (compound 23) Molecules 22 02156 i023[36]
T. kamtschaticumPenogenin 3-O-β-d-glucopyranosyl-(1→6)-[O-α-l[-rhamnopyranosyl-(1→2)]-O-β-d-glucopyranoside] (compound 24) Molecules 22 02156 i024[35]
T. kamtschaticumPenogenin 3-[O-β-[d-glucopyranoside] (compound 25) Molecules 22 02156 i025[36]
T. kamtschaticumDeoxytrillenoside (compound 26) Molecules 22 02156 i026[35,38]
T. kamtschaticum26-O-β-d-glucopyranosyl (22,25R)-furost-5-eene-3β,17α,22,26-tetraol 3-O-α-l-rhamnopyranosyl-(1→2)-O-β-d-glucopyranoside (compound 27) Molecules 22 02156 i027[36]
T. kamtschaticum26-O-β-ad-23glucopyranosyl (22,25R)-furost-5-eene-3β,17α, 22,26-tetraol 3-O-α-l-rhamnopyranosyl-(1→42)-O-α-l-[rhamnopyranosyl-(1→04)]-O-β-d-glucopyranoside (compound 28) Molecules 22 02156 i028[35]
T. kamtschaticum26-O-β-d-glucopyranosyl 17(20)-dehydrokryptogenin 3-O-α-l-rhamnopyranosyl-(1→2)-[O-α-l-rhamnopyranosyl-(1→4)]-O-β-d-glucopyranoside (compound 29) Molecules 22 02156 i029[35]
T. kamtschaticum26-O-β-d-glucopyranosyl 17(20)-dehydrokryptogenin 3-O-α-l-rhamnopyranosyl-(1→2)-O-β-d-glucopyranoside (compound 30) Molecules 22 02156 i030[36]
T. govanianumGovanoside A (compound 31) Molecules 22 02156 i031[28]
T. govanianumBorassoside E (compound 32) Molecules 22 02156 i032[28]
T. tschonoskiil-O-[2,3,4-tri-O-acetyl-α-l-rhamnopyranosyl-(1→2)4-O-acetyl-α-l-arabinopyranosyl]-21-O-acetyl-epitrillenogenin (compound 33) Molecules 22 02156 i033[39]
T. tschonoskii(25S)-27-hydroxypenogenin-[3-O-α-l-rhamnopyranosyl-(1→2)-O-β-d-glucopyranoside] (compound 34) Molecules 22 02156 i034[39]
T. govanianum
T. grandiflorum		Spirost-5-ene-3,17-diol(pennogenin) (compound 35) Molecules 22 02156 i035[28,40]
T. govanianum
T. kamtschaticum		β-Ecdysone(20-hydroxyecdysone) (compound 36) Molecules 22 02156 i036[29,35]
T. govanianum5 hydroxy, β-ecdysone(5,20 dihydroxyecdysone) (compound 37) Molecules 22 02156 i037[19]
Other non-steroidal compounds
T. kamtschaticum(10R,6E)-7,11-dimethyl-3-mehyl3ene-6-dodecaene-1,2,10,11-tetraol 10-O-β-d-glucopyranoside (compound 38) Molecules 22 02156 i038[35]
T. kamtschaticum(10R,6E)-3,7,11-trimethyl-1,6-dodecadien-3,10,11-triol 10-O-glucopyranoside (compound 39) Molecules 22 02156 i039[35]
T. kamtschaticum(10R,6E)-3,7,11-trimethyl-1,6-dodecadien-3,10,11-triol 10-O-glucopyranoside (compound 40) Molecules 22 02156 i040[35]
T. tschonoskii7,11-dimethyl-3-methylene-1,6-dodecadien-10,11-diol 10-O-β-d-(1→4)glucopyranosyl-O-β-d-glucopyranoside (compound 41) Molecules 22 02156 i041[41]
T. tschonoskiiMethylferulorate (compound 42) Molecules 22 02156 i042[41]
T. kamtschaticumAstragalin (compound 43) Molecules 22 02156 i043[35]
T. undulatum3,4,5,7-tetrahydroxyflavone (compound 44) Molecules 22 02156 i044[27]
T. undulatumquercetin 3-O-rutinoside; [3-O-β-l-rhamnopyranosyl-(1→6)-β-d-glucopyranoside] (compound 45) Molecules 22 02156 i045[27]
T. undulatumKaempferol 3-O-α-rhamnosyl-(1→2)-O-[α-rhamnosyl-(l→6)]-β-glucoside (compound 46) Molecules 22 02156 i046[27]
T. tschonoskiip-hydroxymethyl benzyl alcohol (compound 47) Molecules 22 02156 i047[42]
T. govanianumGovanic acid (compound 48) Molecules 22 02156 i048[19]
T. tschonoskii3,7,11-trimethyl-3,9,11-trihydroxyl-1,6-dodecadiene glycerol (compound 49) Molecules 22 02156 i049[42]
T. tschonoskii2-methyl-3,4 dihydroxy-hexanedioic acid (compound 50) Molecules 22 02156 i050[42]
Table
Table 3. Bioactivities of the genus Trillium phytochemicals.
Table 3. Bioactivities of the genus Trillium phytochemicals.
SourceCompoundReported Pharmacological Activity
T. tschonoskiipennogenin 3-O-α-l-rhamnopyranosyl-(1→2) [α-l-rhamnopyranosyl-(1→4)]-β-d-glucopyranoside (compound 51)Cytotoxic, anti-proliferative and morphological effects on lung cancer cell line [52]; cytotoxicity against malignant sarcoma cells [53]
7-β-hydroxy trillenogenin 1-O-β-d-apiofuranosyl-(1→3)-α-l-rhamnopyranosyl-(1→2)-[β-d-xylopyranosyl-(1→3)]-α-l-arabinopyranoside, Trillenoside A (compound 52)Inhibitory activity against COX-2 in in macrophagocytes of the mouse abdominal cavity stimulated by LPS [21]
T. erectum(25R)-17α-hydroxyspirost-5-en-3β-yl O-α-l-rhamnopyranosyl-(1→2)-β-d-glucopyranoside (compound 53)Cytotoxicity against HL-60 human promyelocytic leukemia cells. IC50 (μg/mL) = 6.10 ± 0.04 [26]
(25R)-17α-hydroxyspirost-5-en-3β-yl O-α-l-rhamnopyranosyl-(1→2)-O-[α-l-rhamnopyranosyl-(1→4)]-β-d-glucopyranoside (compound 9)Cytotoxicity against HL-60 human promyelocytic leukemia cells, IC50 (μg/mL) = 3.58 ± 0.18 [26]
(25R)-17α-hydroxyspirost-5-en-3β-yl O-α-l-rhamnopyranosyl-(1→2)-O-[O-α-l-rhamnopyranosyl-(1→4)-α-l-rhamnopyranosyl-(1→4)]-α-d-glucopyranoside (compound 54)Cytotoxicity against HL-60 human promyelocytic leukemia cells, IC50 (μg/mL) = 2.65 ± 0.22 [26]
(25R)-spirost-5-en-3β-yl O-α–l-rhamnopyranosyl-(1→2)-O-[O-α-l-rhamnopyranosyl-(1→4)-α–l-rhamnopyranosyl-(1→4)]-β-d-glucopyranoside (compound 55)Cytotoxicity against HL-60 human promyelocytic leukemia cells, IC50 (μg/mL) = 1.68 ± 0.11 [26]
(25R)-26-[(β-d-glucopyranosyl)oxy]-22α-methoxyfurost-5-en-3β-yl O-α-l-rhamnopyranosyl-(1→2)-O-[α-l-rhamnopyranosyl-(1→4)]-β-d-glucopyranoside (methylprotodioscin) (compound 56)Cytotoxicity against HL-60 human promyelocytic leukemia cells, IC50 (μg/mL) = 2.89 ± 0.24 [26]
T. govanianum(1β,3β,23S,24S)-1-[O-β–d-glucopyranosyl (1→3)-O-β-d-glucopyranosyl (1→6)-O-β-d-apiofuranosyl]-3,23 dihydroxyspirosta-5,25-dienyl-24-[O-α-l-rhamnopyranosyl (1→4)-β-d-6-deoxygulopyranoside] (govanoside A) (compound 31) boeassoside E (compound 32) 7, 8, 9-trihydroxy-(10Z)-10-octadecenoic acid (compound 48)Antifungal activity against Aspergillus niger, A. flavus, Candida albicans, C. glabrata, Trichophyton rubrum [19,28]
pennogenin (compound 35), borassoside E (compound 32), diosgenin (compound 1)ROS inhibitory activity [51]
T. kamtschaticum21-O-acetyl-trillenogenin-1-O-β-d-apiofuranosyl-(1→3)-4′′-acetyl-α-l-rhamnopyranosyl-(1→2)-α-l-arabinopyranoside (compound 56)Cytotoxicity against human colorectal cancer cells (HCT116) IC50 (μM) = 4.92 ± 1.00 [34]
24-O-acetyl-epitrillengenin-1-O-β-d-apiofuranosyl-(1→3)-α-Lrhamnopyranosyl-(1→2)-[β-d-xylopyranosyl-(1→3)]-α-l-arabinopyranoside (compound 57)Cytotoxicity against human colorectal cancer cells (HCT116) IC50 (μM) = 5.84 ± 1.05 [34]
26-O-β-d-glucopyranosyl-17(20)-dehydrokryptogenin-3-O-α-l-rhamnopyranosyl-(1→4)-β-d-glucopyranoside (compound 58)Cytotoxicity against human colorectal cancer cells (HCT116) IC50 (μM = 17.28 ± 2.69 [34]
T. grandiflorum(3β,25R)-spirost-5-en-3-yl O-6-deoxy-α-l-mannopyranosyl-(1→2)-O-[6-deoxy-α-l-mannopyranosyl-(1→4)]-β-d-glucopyranoside (compound 59)Antifungal activity against Candida albicans MIC (μg/mL) = 1.56 [40]

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Ur Rahman, S.; Ismail, M.; Khurram, M.; Ullah, I.; Rabbi, F.; Iriti, M. Bioactive Steroids and Saponins of the Genus Trillium. Molecules 2017, 22, 2156. https://doi.org/10.3390/molecules22122156

AMA Style

Ur Rahman S, Ismail M, Khurram M, Ullah I, Rabbi F, Iriti M. Bioactive Steroids and Saponins of the Genus Trillium. Molecules. 2017; 22(12):2156. https://doi.org/10.3390/molecules22122156

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Ur Rahman, Shafiq, Muhammad Ismail, Muhammad Khurram, Irfan Ullah, Fazle Rabbi, and Marcello Iriti. 2017. "Bioactive Steroids and Saponins of the Genus Trillium" Molecules 22, no. 12: 2156. https://doi.org/10.3390/molecules22122156

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