Acorn peperomia
StarPeperomia tetraphylla
Synonyms: Piper tetraphyllum
Traditionally used for
- Pain & joints
Cautions & contraindications
- Kidney conditions
Western Herbalism Properties
Gallery
Botanical Description
Peperomia tetraphylla, the acorn peperomia or four-leaved peperomia, is a small, succulent, perennial epiphytic or terrestrial herb of the Piperaceae with a wide pantropical and warm-temperate distribution. Stems are slender, slightly fleshy, creeping at the base and then ascending to 10-30 cm tall, often rooting at the lower nodes and turning reddish in strong light. The most distinctive feature is the whorled arrangement of leaves, with four (occasionally three) leaves at each node, giving the plant its specific epithet. Leaves are small, fleshy, broadly elliptic to obovate or almost orbicular, 6-15 mm long and 4-12 mm wide, entire, glabrous, with three to five faint palmate veins from the rounded base and a rounded to slightly notched apex; petioles are short. The inflorescences are slender, terminal or axillary, erect spikes 2-5 cm long bearing many minute, sessile, bisexual flowers tightly arranged along a fleshy rachis; each flower lacks perianth and consists of two stamens and a single carpel subtended by a small peltate bract. Fruits are tiny, ovoid, sticky drupelets 0.5-1 mm long. The species grows on mossy rocks, tree trunks and humus-rich forest floor in tropical and subtropical regions worldwide.
Active Constituents
Aristolactam AII
Aristolactam (phenanthrene lactam) alkaloidConcentration: Isolated from the ethyl acetate soluble fraction of the whole herb and reported from this plant for the first time in 2010
The most safety-relevant compound reported from this herb, and it is reported from the whole plant, which is the part used. Aristolactams are the phenanthrene lactam class to which aristolactam I and aristolactam II belong; those two are the species that form the deoxyadenosine and deoxyguanosine DNA adducts underlying aristolochic acid nephropathy and its associated upper urothelial carcinoma, and aristolactam I has been shown to bioaccumulate and form DNA adducts in its own right rather than only as an aristolochic acid metabolite. Aristolactam AII is a distinct compound from aristolactam I, its own nephrotoxicity and genotoxicity have not been separately characterised, and its presence does not mean the plant contains aristolochic acid: aristolactams are made de novo across the Piperaceae, Annonaceae and Menispermaceae without any aristolochic acid precursor. What it does mean is that the class cannot be assumed benign here and has never been assayed in this drug.
Aristolactam BII
Aristolactam (phenanthrene lactam) alkaloidConcentration: Isolated alongside aristolactam AII from the ethyl acetate soluble fraction of the whole herb, first report from this species in 2010
The second aristolactam reported from the whole plant. The same reasoning applies as for aristolactam AII: it belongs to a class with a serious renal and urothelial toxicology, its individual toxicology is uncharacterised, and no published work has quantified either alkaloid in commercial or wild-collected material of this herb.
Peperotetraphin
Cyclobutane-type norlignanConcentration: Isolated from the whole plant; named for this species
Methyl rel-(1R,2S,3S)-2,3-bis(7-methoxy-1,3-benzodioxol-5-yl)cyclobutanecarboxylate. It inhibited human prostate cancer PC-3 cell growth in a dose- and time-dependent way, arresting cells at the G1 to S transition and inducing apoptosis. Cell culture only; no animal or human work follows it.
Peperobtusin A
Prenylated phenolic (isopentenyl resorcinol type)Concentration: Isolated from the whole plant; identified as a principal cytotoxic constituent of the ethyl acetate extract
Isolated after the crude ethyl acetate extract was shown to kill lymphoma U937 cells, in order to find what in the extract was responsible. It raised intracellular reactive oxygen species, collapsed mitochondrial membrane potential, increased the Bax to Bcl-2 ratio, cleaved Bid and caspases 3, 8 and 9, raised phospho-p38 and arrested cells in S phase, with the effect reversible by the antioxidant N-acetylcysteine, a pan-caspase inhibitor and a p38 inhibitor. All of this is in a cell line.
Peperobtusin B and peperobtusin C
Isopentenyl resorcinolConcentration: Two isopentenyl resorcinols isolated from the plant and structurally characterised in 2020
Tested against G2, A549, HeLa and HCT 116 cell lines, where the authors themselves describe the cytostatic activity of both compounds as weak. Recording that negative result matters: the antitumour reputation of this herb rests on the extract and on peperobtusin A, not on the resorcinol series as a whole.
Cyclobutane-type norlignans of the whole plant
NorlignanConcentration: Two new cyclobutane norlignans characterised from the whole plant in 2012 alongside a new lignanamide
Methyl esters bearing a methoxy-benzodioxole and a trimethoxyphenyl ring on a cyclobutane core. Tested against HepG2, A549 and HeLa lines, the new norlignans were not the active compounds; a known co-isolated amide gave the only significant cytotoxicity in that paper, with an IC50 of 9.4 micromolar against HepG2.
Hydroxycinnamic acid amides (N-trans-feruloyltyramine, N-trans-sinapoyltyramine, N-trans-feruloylmethoxytyramine, N-p-coumaroyltyramine)
Phenolic amide (hydroxycinnamoyl tyramine)Concentration: Four of the six amides isolated from the ethyl acetate fraction of the whole herb, all reported from this plant for the first time in 2010
Tyramine amides of ferulic, sinapic and coumaric acids, a class widespread in the Piperaceae with general antioxidant and anti-inflammatory activity. They are the least remarkable constituents here but the most abundant class of the amide fraction, and they are what a phenolic assay of this herb would mostly be measuring.
Lignanamide of the whole plant
LignanamideConcentration: One new lignanamide characterised from the whole plant in 2012
A dimeric hydroxyphenylethyl cinnamamide ether, structurally a coupled pair of the hydroxycinnamic acid amides above. Reported without significant cytotoxicity in the assays used.
⚠ Drug Interactions
Any concurrent nephrotoxin, and any patient with existing renal impairment or a history of aristolochic acid exposure
Two aristolactams, aristolactam AII and aristolactam BII, were isolated from the ethyl acetate fraction of this whole herb in 2010 and reported from the species for the first time. Aristolactams are the compound class that carries the renal and urothelial toxicity of aristolochic acid: aristolactam I and II form the persistent deoxyadenosine and deoxyguanosine DNA adducts found in the renal cortex of patients with aristolochic acid nephropathy and generate its characteristic TP53 mutational signature, and aristolactam I has been shown to bioaccumulate and form adducts on its own. Two things must be said precisely. First, aristolactams in Piperaceae are biosynthesised independently and their presence is not evidence that this plant contains aristolochic acid, which has never been reported from it. Second, the specific aristolactams found here, AII and BII, have not themselves been tested for nephrotoxicity or genotoxicity, and no one has quantified them in commercial material. The honest position is that a compound class with a well-documented renal carcinogenic mechanism is present in a herb that has never been assayed for it, and that absence of an assay is not evidence of safety.
Clinical note: Do not use in anyone with chronic kidney disease, a single kidney, a transplant, or known past exposure to aristolochic acid containing herbs, and avoid pairing it with NSAIDs, aminoglycosides, ciclosporin, tacrolimus or high-dose contrast. For anyone else, keep courses short rather than continuous, and prefer a better-characterised herb where one will do the same job.
Xi Xin (Asari Radix et Rhizoma) and Si Kuai Wa (Chloranthus species) dispensed against this herb's folk names
This herb's regional Chinese names create two dangerous collisions. In Guizhou it is called Gua Zi Xi Xin, sharing the name Xi Xin with Asari Radix et Rhizoma, an Aristolochiaceae drug that genuinely contains aristolochic acid, is restricted in most Western jurisdictions and is dose-limited even within the Chinese Pharmacopoeia. In Yunnan it is called Si Kuai Wa, a name whose principal referent is Chloranthus, an entirely different family with its own toxicology. A prescription or a supplier's label written with one of these vernacular names does not identify a species, and the error can run in either direction.
Clinical note: Never accept, write or fill an order for this herb under the names Gua Zi Xi Xin or Si Kuai Wa. Require the binomial Peperomia tetraphylla on the label and the certificate of analysis, and treat any material labelled Xi Xin as the Asarum drug with all the restrictions that carries until proven otherwise.
Wild-collected or unsourced material from contaminated ground
This species is used deliberately in phytoremediation. A 2021 study co-planted it with Syngonium podophyllum to strip uranium from low-concentration uranium-bearing wastewater, and found uranium held largely in the cell wall fraction (54 to 67 percent) and the soluble fraction (24 to 33 percent) of the plant, with transport from root to shoot. That is a hydroponic remediation system, not a field harvest, and it says nothing about ordinary material. It does establish that the plant takes radionuclides and metals up readily into the shoot, which is the part used medicinally.
Clinical note: This is a sourcing question, not a prescribing one. Buy from a supplier who tests for heavy metals, and do not use material collected from industrial, mining or waterway margins.
Evidence Tier
Moderate evidence · 4 studiesRecorded studies by study design, strongest design at the top. This is a study-design tier only, not a GRADE rating: it does not weigh risk of bias, consistency or precision.
Systematic review / meta-analysis
0
Randomized controlled trial
0
Other clinical trial
0
Observational / case report
0
In vitro / animal
4
0 verified · 4 unverified
Show 4 studies
- Ethyl acetate extract of Peperomia tetraphylla induces cytotoxicity, cell cycle arrest, and apoptosis in lymphoma U937 cells
- The natural phenolic peperobtusin A induces apoptosis of lymphoma U937 cells via the Caspase dependent and p38 MAPK signaling pathways
- Peperotetraphin inhibits the proliferation of human prostate cancer cells via induction of cell cycle arrest and apoptosis
- Two isopentenyl resorcinols from Peperomia tetraphylla
Other / unclassified
0
Verified: design read from PubMed for a DOI that resolves to the cited paper Unverified: taken from the study's recorded description
Clinical Studies
Ethyl acetate extract of Peperomia tetraphylla induces cytotoxicity, cell cycle arrest, and apoptosis in lymphoma U937 cells
The ethyl acetate extract inhibited U937 lymphoma cell growth, collapsed mitochondrial membrane potential, raised reactive oxygen species, arrested cells in S phase and cleaved caspases 3, 8 and 9 and Bid, with Bax up and CCNB1, CCND1 and CDK1 down. A cell-line study in a single immortalised line, with no animal model and no dosing that could be related to a human decoction.
The natural phenolic peperobtusin A induces apoptosis of lymphoma U937 cells via the Caspase dependent and p38 MAPK signaling pathways
Follow-up to the 2016 extract paper, isolating peperobtusin A from the whole plant and showing dose-dependent antiproliferative and apoptotic effects on U937 cells through reactive oxygen species, mitochondrial depolarisation, caspase cleavage and p38 MAPK, reversible with N-acetylcysteine, Z-VAD-FMK and SB203580. Still cell culture only.
Peperotetraphin inhibits the proliferation of human prostate cancer cells via induction of cell cycle arrest and apoptosis
Peperotetraphin, a cyclobutane norlignan from the whole plant, inhibited PC-3 prostate cancer cell growth dose- and time-dependently, arrested cells at the G1 to S transition and induced apoptosis on TUNEL and annexin V staining. There is no animal or human follow-up, and nothing here supports use of this herb in prostate cancer.
Two isopentenyl resorcinols from Peperomia tetraphylla
Peperobtusin B and peperobtusin C were isolated and characterised, then screened against G2, A549, HeLa and HCT 116 cells, where the authors report the cytostatic activity of both as weak. Included here as a negative result: it narrows the herb's in vitro antitumour activity to specific compounds rather than to the resorcinol class generally.
Historical Texts
Zhi Wu Ming Shi Tu Kao (Illustrated Investigation of Names and Natures of Plants), Wu Qijun
Qing dynasty, 1848E Mei Yao Zhi (Medicinal Plants of Mount Emei)
Republican-era Sichuan regional survey, 1945Guizhou Cao Yao (Guizhou Herbal Medicines)
Modern Chinese provincial herbal, 1970Yunnan Zhong Cao Yao (Yunnan Chinese Herbal Medicines)
Modern Chinese provincial herbal, 1971Zhong Hua Ben Cao and Quan Guo Zhong Cao Yao Hui Bian, entry Dou Ban Lu
Modern national compilations, late 20th centuryReferences
- Yunzhi L. Amides from Peperomia tetraphylla . China Journal of Chinese Materia Medica (Zhongguo Zhong Yao Za Zhi) (2010) [DOI]
- Li YZ, Tong AP, Huang J. Two New Norlignans and a New Lignanamide from Peperomia tetraphylla . Chemistry & Biodiversity (2012) [DOI]
- Li YZ, Peng DY, Dai M, Xiao CM, Jiang HB, Huang J. A new phenylpropanoid from Peperomia tetraphylla . Natural Product Research (2013) [DOI]
- Wang L, Wang S, Yao Q, Wang B, Duan W, Zhou H, Duan K. Chemical constituents of Peperomia tetraphylla (Forst. F.) Hooker et Arnott . Biochemical Systematics and Ecology (2021) [DOI]
- Wang S, De Souza C, Wang L, Zhou H. Chemical constituents from the whole herbs of Peperomia tetraphylla and their chemotaxonomic significance . Biochemical Systematics and Ecology (2021) [DOI]
- Jelakovic B, Karanovic S, Vukovic-Lela I, Miller F, Edwards KL, Nikolic J, Tomic K, Slade N, Brdar B, Turesky RJ, Stipancic Z, Dittrich D, Grollman AP, Dickman KG. Aristolactam-DNA adducts are a biomarker of environmental exposure to aristolochic acid . Kidney International (2012) [DOI]
- Au CK, Ham YH, Chan W. Bioaccumulation and DNA Adduct Formation of Aristolactam I: Unmasking a Toxicological Mechanism in the Pathophysiology of Aristolochic Acid Nephropathy . Chemical Research in Toxicology (2023) [DOI]
- Zhang Y, Ding D, Li G, Yi H, Zhai K, Hu N, Zhang H, Dai Z, Ma J, Li F, Sun J, Wang Y. Enhanced effects and mechanisms of Syngonium podophyllum-Peperomia tetraphylla co-planting on phytoremediation of low concentration uranium-bearing wastewater . Chemosphere (2021) [DOI]
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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