Dioscorea nipponica
What's the taxonomical classification of Dioscorea nipponica?
Dioscorea nipponica belongs to the kingdom Plantae and is classified under the phylum Streptophyta. Within the class Equisetopsida, it is positioned in the subclass Magnoliidae and falls under the order Dioscoreales. This plant is a member of the family Dioscoreaceae, which contains the genus Dioscorea, and is specifically identified by the species name nipponica.
| Taxonomic Rank | Classification |
|---|---|
| Kingdom | Plantae |
| Phylum | Streptophyta |
| Class | Equisetopsida |
| Subclass | Magnoliidae |
| Order | Dioscoreales |
| Family | Dioscoreaceae |
| Genus | Dioscorea |
| Species | nipponica |
What are the morphological characteristics of this plant?
Dioscorea nipponica has climbing stems that emerge from underground tubers, heart-shaped leaves with long petioles, and small, yellowish-green flowers arranged in clusters. The foliage typically displays a distinct cordate shape and can grow quite large as the vines ascend nearby vegetation. Its stems are slender and flexible, allowing the plant to scramble effectively through forest undergrowth. The reproductive structures consist of inconspicuous flowers that lack showy petals, making them blend into the surrounding greenery. During the growing season, the plant develops a lush canopy of leaves that provides significant ground cover.
What is the geographical distribution of this plant?
This plant is native to the temperate regions of Japan, where it is primarily distributed across the islands of Honshu, Shikoku, and Kyushu. It typically inhabits mountainous or hilly areas characterized by shaded, moist environments. Within these landscapes, the species is often found growing in deciduous forests or along the edges of woodland paths. Its presence is most concentrated in areas with well-drained soil and moderate seasonal temperature fluctuations. The specific microclimates of these Japanese woodlands support its climbing growth habit.
How is this plant cultivated?
This plant requires well-drained, humus-rich soil and a position in partial shade to thrive in temperate climates.
Because it is a climbing tuber, it needs a sturdy trellis or support structure to allow its vines to spread. Regular watering is essential during the growing season, but the soil must not remain waterlogged to prevent tuber rot. During the winter months, the foliage will die back, and the plant enters dormancy requiring minimal care.
Once established, it is a resilient perennial that can be propagated through its underground rhizomes.
What parts of this plant are used medicinally?
This plant Dioscorea nipponica utilizes its rhizome, root, leaf, shoot, and stem for various medicinal applications in traditional practices. The starch-rich rhizome and underground root are frequently processed to treat digestive issues and provide nutritional support. Both the tender shoots and leaves are sometimes consumed or prepared to address inflammatory conditions. Additionally, the stem can be utilized in specific topical or systemic preparations. These diverse plant components collectively offer a wide range of therapeutic potential.
According to a study published by "Journal of pharmaceuatical and biomedical analysis", the dried rhizome of Dioscorea nipponica Makino is used as a medicinal herb. This study utilized ultra-high performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry to identify 40 compounds including steroidal saponins, free fatty acids, and organic acids. Researchers used a hypoxia/reoxygenation-induced H9c2 cell injury model and the cell counting kit-8 method to detect antimyo-cardial ischemia activity. The results showed that the antimyo-cardial ischemia potential of samples from the Heilongjiang province was higher than other studied samples. Specifically, 5 compounds were significantly up-regulated and correlated with antimyo-cardial ischemia in the DNR samples from Heilongjiang province.
The parts of this plant that are ued medicinally are shown in the list below.
- rhizome
- root
- leaf
- shoot
- stem
What traditional systems uses this plant?
This plant Dioscorea nipponica has been utilized for centuries within traditional Chinese Materia Medica to treat various internal ailments and digestive issues. Historical practitioners primarily valued its tubers for their ability to tonify the spleen and kidneys while regulating the flow of qi. In many East Asian herbal traditions, the root was prepared in specific ways to address chronic fatigue and weakness. These traditional systems often focused on the plant's role in restoring bodily balance and strengthening the digestive system. Modern ethnobotanical studies continue to examine these historical applications to understand the plant's bioactive properties.
According to a study published by "Microscopy research and technique", Dioscorea nipponica is one of 7 representative Bixie herbs characterized in this research. This study utilized 3 types of microscopy, including common light microscopy, fluorescence microscopy, and polarized light microscopy, to differentiate the species. The investigation focused on the microscopic examination of powders and cryotomed transverse sections of the plants. Researchers aimed to distinguish these herbs to ensure correct use, as traditional efficacies and chemical profiles can vary wildly. The study provides a method to authenticate these herbs using features such as starch granules, stone cells, and vascular bundles.
The hystorical systems that uses this plant are shown in the list below.
- Chinese Materia Medica
What are the pharmacological activities of Dioscorea nipponica?
This plant has anti-myocardial ischemia, anti-inflammatory, anti-tumor, anti-oxidant, and cardioprotective pharmacological activities. Its potent antioxidant properties help neutralize free radicals and reduce oxidative stress within biological systems. These mechanisms contribute significantly to its ability to provide cardioprotective effects against various forms of cardiac injury. Furthermore, the plant demonstrates the capacity to mitigate inflammation and inhibit the growth of certain tumor cells. Through these diverse actions, Dioscorea nipponica serves as a significant subject for therapeutic research.
According to a study published by "Journal of pharmaceutical and biomedical analysis", Dioscorea nipponica Makino is a medicinal herb used to assess antimyoercardial ischemia activity. Using a hypoxia/reoxygenation-induced H9c2 cell injury model and the CCK-8 method, the study found that samples from Heilongjiang province possessed a higher antimyoercardial ischemia potential than other studied samples. Through UPLC-Q TOF-MS, 40 compounds including steroidal saponins, free fatty acids, and organic acids were tentatively identified. Furthermore, 5 compounds were significantly up-regulated and correlated with antimyoercardial ischemia in the DNR samples from Heilongjiang province.
The primary pharmacological activities of this plant are shown in the list below.
- anti-myocardial ischemia
- anti-inflammatory
- anti-oxidant
- cardioprotective
- improvement of myocardial I/R injury
What medicinal compounds this plant contains?
This plant contains the medicinal compounds dioscin, diosniponol A, diosniponol B, parvifloside, and protobioside. These specific chemical constituents are primarily categorized as steroidal saponins and flavonoids. Research indicates that these molecules contribute to the plant's diverse biological activities. Scientists study these substances to understand their potential roles in pharmacology and traditional medicine. Each compound possesses a unique structure that influences how it interacts with biological systems.
According to a study published by "Journal of ethnopharmacology", Dioscorea nipponica contains dioscin and diosgenin. These compounds have been utilized as the main active ingredients of traditional herbal medicinal products for coronary heart disease in the former Soviet Union and China since the 1960s. Dioscin and diosgenin derived from this genus have a wide range of pharmacological activities in heart diseases. These substances can effectively improve hypertrophic cardiomyopathy, arrhythmia, myocardial I/R injury and cardiotoxicity caused by doxorubicin. However, the bioavailability of dioscin and diosgenin may be too low due to poor absorption and slow metabolism.
The primary medicinal compounds of this plant are shown in the list below.
- Dioscin
- Dioisgenin
- Diosniponol A
- Diosniponol B
- Protodiosciin
What health conditions is this plant used for?
This plant is used for treating asthma, cough, chronic inflammation, rheumatic aches, and tumors. Its medicinal properties are often applied to soothe respiratory distress and alleviate persistent coughing fits. The plant also serves as a natural remedy to reduce systemic chronic inflammation throughout the body. Many traditional practitioners rely on its ability to ease the discomfort caused by various rheumatic aches in the joints. Furthermore, research into its bioactive compounds has explored its potential role in managing tumor growth.
According to a study published by "BioMed research international", Dioscorea nipponica Makino (DNM) is a traditional herb used to relieve asthma. In an ovalbumin-induced asthma model using mice, DNM relieved the allergic inflammatory response and oxidative stress. The plant helped recover the downregulation of RKIP and the pathological injury of lung tissues in the asthma mice. DNM also worked to block the Raf-1/MEK/MAPK/ERK pathway. This relief occurs through the blocking of the Raf-1/MEK/MAPK/ERK pathway mediated by RKIP upregulation.
The main health conditions this plant is used for are shown in the list below.
- inflammation
- pain
- rheumatic aches
- dispersing swelling
- poor blood circulation
What are the herbal preparations of this plant?
This plant is used to produce medicinal preparations such as Dioscoreae Nipponicae Rhizoma and concentrated Dioscorea nipponica extract for various therapeutic purposes. Dioscoreae Nipponicae Rhizoma refers specifically to the dried rhizome of the plant which is prepared for use in traditional decoctions. The Dioscorea nipponica extract provides a more potent form of the plant's active compounds for standardized dosing. These preparations are often utilized in herbal medicine to address specific physiological needs or systemic imbalances. Researchers study these forms to better understand the pharmacological efficacy of the species.
According to a study published by "Journal of chromatography. A", Dioscorea nipponica and preparations made from it have long been used in traditional Chinese medicine to prevent and treat coronary heart disease. A group of steroidal saponins present in the plant are believed to be the active ingredients. Using human serum albumin functionalized magnetic nanoparticles, three saponins including dioscin, gracillin, and pseudo-protodioscin were effectively isolated from the extract. Two other saponins were detected in the extract, which were protodioscin and 26-O-β-D-glucopyranosyl-3β,20α,26-triol-25(R)-Δ(5,22)-dienofurostan-3-O-α-L-rhamnopyranosyl (1→2)-[α-L-rhamnopyranosyl (1→4)]-β-D-glucopyranoside. Among the 3 saponins fished out, dioscin bound to HSA much stronger than gracillin and pseudo-protodioscin did.
The main herbal preparations of this plant are shown in the list below.
- Dioscorea nipponica extract
- Dioscoreae Nipponicae Rhizoma
What side effects this plant can have?
This plant can cause significant physiological disruptions including membrane permeabilization and a reduced time of blood coagulation. The process of membrane permeabilization occurs when certain compounds compromise the integrity of cellular barriers, potentially leading to unregulated substance exchange. Additionally, the plant interferes with the body's natural clotting mechanisms, which leads to a significantly reduced time of blood coagulation. These combined effects can alter cellular stability and increase the risk of excessive bleeding in sensitive individuals. Such biochemical interactions necessitate caution when considering the medicinal or dietary use of this species.
According to a study published by "Purinergic signalling", Dioscorea nipponica was identified as one plant extract demonstrating positive modulator activity. Within this plant, dioscin was identified as a glycoside with positive allosteric modulator activity in both ATP-induced YO-PRO-1 uptake assays and whole-cell patch-clamp recordings. However, the study observed membrane permeabilisation following application for more than 10 minutes. This specific side effect limited the potential use of dioscin as a pharmacological tool.
The main side effects this plant can have are shown in the list below.
- membrane permeabilisation
- reduced time of blood coagulation
What herbs are paired with Dioscorea nipponica?
This plant Dioscorea nipponica is frequently paired with Rehmannia glutinosa, Panax ginseng, and Glycyrrhiza uralensis to enhance its tonic properties in traditional formulations.
These combinations are specifically designed to support kidney yin and nourish the blood. When mixed with Rehmannia, the tuber helps to strengthen the body's essence and vital energy. The addition of ginseng works synergistically to boost overall stamina and immune function. Glycyrrhiza is often included to harmonize the various herbal components and mitigate any potential harshness.
These specific pairings are essential for creating balanced medicinal decoctions.