Rehmannia glutinosa
What's the taxonomical classification of Rehmannia glutinosa?
Rehmannia glutinosa belongs to the kingdom Plantae and is classified under the phylum Streptophyta. Within this group, it is categorized under the class Equisetopsida and the subclass Magnoliidae. The plant follows the taxonomic order Lamiales and is a member of the family Orobanchaceae. Finally, its specific biological identity is defined by the genus Rehmannia and the species epithet glutinosa.
| Taxonomic Rank | Classification |
|---|---|
| Kingdom | Plantae |
| Phylum | Streptophyta |
| Class | Equisetopsida |
| Subclass | Magnoliidae |
| Order | Lamiales |
| Family | Orobanchaceae |
| Genus | Rehmannia |
| Species | glutinosa |
What are the morphological characteristics of this plant?
Rehmannia glutinosa has an erect, herbaceous stem that reaches heights of 30 to 80 centimeters and is covered in fine, glandular hairs. The leaves are opposite, ovate to broadly lanceolate, and possess serrated margins with a distinctively rough or sticky texture. Small, tubular flowers emerge from the leaf axils in terminal clusters, typically displaying colors ranging from pale yellow to deep orange. The plant produces small, globular fruits that contain numerous tiny seeds upon maturity. Its root system consists of thick, fleshy, tuberous rhizomes that are dark brown to blackish on the exterior.
What is the geographical distribution of this plant?
This plant is native to the tropical and subtropical regions of South and Southeast Asia, specifically found in countries such as India, China, and parts of the Indochinese Peninsula. It thrives primarily in moist, deciduous forests and hilly terrains where humidity levels remain high. Within these habitats, the species is often discovered growing in shaded areas under a dense forest canopy. Its distribution is closely linked to specific elevations and seasonal rainfall patterns characteristic of these monsoon-influenced zones. This localized presence makes it a significant component of the regional biodiversity in these particular ecological niches.
How is this plant cultivated?
This plant, Rehmannia glutinosa, is cultivated in tropical and subtropical regions by planting seeds or cuttings in well-drained, fertile soil under partial shade.
Growers must ensure a warm climate with consistent moisture levels to support its growth as a perennial shrub. Regular watering and organic fertilization are essential to maintain the health of the plant and promote the development of its medicinal properties. Because it thrives in humid environments, careful monitoring of soil drainage is necessary to prevent root rot.
Proper cultivation techniques ensure a high yield of the plant's valuable gum resin.
What parts of this plant are used medicinally?
This plant Rehmannia glutinosa provides medicinal value through its radix, leaves, rhizome, shoots, and stem. The root, or radix, is frequently utilized in traditional formulations to treat various ailments. Practitioners also harvest the leaves and the stems to extract bioactive compounds for therapeutic use. Additionally, the rhizome and the tender shoots offer specific chemical properties essential for herbal remedies. Each of these distinct anatomical parts contributes unique healing qualities to the overall medicinal profile of the species.
According to a study published by "Journal of chromatography. A", the medicinal part of the plant Rehmannia glutinosa used is the Rehmanniae Radix (RR). The study explored the holistic chemome, which includes the secondary metabolome and glycome, to find differences between raw and processed RR. Research identified a set of differential marker compounds consisting of saccharides, glycosides, and furfurals. These chemical transformations involve the stepwise change of saccharides, such as polysaccharides, oligosaccharides, and monosaccharides, along with glycosides like iridoid glycosides and phenethylalcohol glycosides. These substances are transformed into furfurals, specifically glycosylated and non-glycosylated hydroxymethylfurfurals, through deglycosylation and/or dehydration.
The parts of this plant that are ued medicinally are shown in the list below.
- Radix
- leaf
- rhizome
- shoots
- stem
What traditional systems uses this plant?
This plant, Rehmannia glutinosa, is utilized in traditional Chinese herbaceous medicine and the Japanese Kampo system to treat various ailments related to inflammation and pain. In Chinese medicinal practices, it is often prescribed to clear heat and resolve toxicity within the body. Kampo practitioners similarly integrate this species into complex formulas to address specific physiological imbalances. Historical applications frequently focus on its ability to soothe internal swelling and promote circulation. These long-standing traditions emphasize the botanical's role in managing systemic discomfort through specialized decoctions.
According to a study published by "PloS one", the consecutive monoculture for medicinal plants such as Rehmannia glutinosa results in a significant reduction in both yield and quality. To analyze the underlying mechanisms of these problems, 103 protein spots with high resolution and repeatability were selected and identified using MALDI TOF-TOF MS. The comparative metaproteomics analysis revealed 33 differentially expressed protein spots in the rhizosphere soil in response to increasing years of monoculture. These changes in the soil microbial ecology and nutrient cycles lead to the retardation of plant growth and development. Ultimately, the interactions among plant, soil, and microflora at the proteomic level are crucial for the productivity and quality of Rehmannia glutinosa in a consecutive monoculture system.
The hystorical systems that uses this plant are shown in the list below.
- Chinese herbaceous medicine
- Kampo
What are the pharmacological activities of Rehmannia glutinosa?
This plant has demonstrated significant pharmacological activities including anti-inflammatory, anti-diabetic, anti-oxidant, neuroprotective, and hepatoprotective properties. Its antioxidant capabilities help neutralize free radicals, which provides a foundational defense against cellular damage. By reducing inflammation, the plant aids in managing various inflammatory conditions throughout the body. Research also highlights its potential to regulate blood glucose levels, offering valuable anti-diabetic benefits. Furthermore, its neuroprotective effects support brain health, while its hepatoprotective qualities assist in protecting the liver from toxic insults.
According to a study published by "Organic letters", four novel carotenoid derivatives known as rehmannins A-D (1-4) were isolated from the fresh roots of Rehmannia glutinosa. These compounds, specifically rehmannins B-D (2-4), possess a novel tricyclic ring system bearing five contiguous stereocenters on the heterocyclic core. Among these isolated metabolites, compound 3 exhibited the inhibition of NO secretion in LPS-induced RAW264.7 cells. The study identified these substances as anti-inflammatory carotenoid pigments.
The primary pharmacological activities of this plant are shown in the list below.
- Anti-inflammatory
- Anti-diabetic
- Anti-oxidant
- Neuroprotective
- Hepatoprotective
What medicinal compounds this plant contains?
This plant contains the medicinal compounds acteoside, catalpol, geniposidic acid, Rehmannia glutinosa polysaccharide, and Rehmannia glutinosa total glycoside. These specific iridoid glycosides and phenylethanoid glycosides are responsible for much of the herb's biological activity. The presence of Rehmannia glutinosa polysaccharide contributes to its unique immunomodulatory properties. Additionally, the Rehmannia glutinosa total glycoside fraction provides a complex mixture of bioactive elements that support various therapeutic functions. These diverse chemical constituents work together to facilitate the plant's traditional medicinal uses.
According to a study published by "Molecules and cells", Rehmannia glutinosa contains the phenolic compound acteoside, which has been shown to inhibit paraquat. The plant utilizes a phenylpropanoid pathway to produce the acteoside moiety. Within this pathway, a phenylalanine ammonia-lyase (PAL) cDNA clone known as RgPAL1 was isolated. This RgPAL1 sequence features a deduced 712 amino acid open reading frame containing a conserved active site. The RgPAL1 mRNA is detected in the leaves, flowers, and roots of the plant. Following exposure to paraquat or jasmonic acid, the transcript level and enzyme activity increase gradually from 6 to 24 h.
The primary medicinal compounds of this plant are shown in the list below.
- Acteoside
- Aucubin
- Catalpol
- Geniposidic Acid
- Rehmannia glutinosa polysaccharide
What health conditions is this plant used for?
This plant is used for treating Alzheimer's disease, Parkinson's disease, diabetes mellitus, cognitive impairment, and liver damage. Its bioactive compounds are studied for their potential to protect neurons and improve memory functions in patients experiencing cognitive impairment. Researchers also investigate its ability to regulate blood sugar levels to help manage diabetes mellitus. Furthermore, the plant exhibits properties that may shield hepatic cells from injury to prevent or mitigate liver damage. These multifaceted therapeutic effects make it a significant subject in neurological and metabolic research.
According to a study published by "Neuroscience letters", Rehmannia glutinosa is part of the PMC-12 complex used to treat neurodegenerative conditions such as Alzheimer's disease and neurocognitive dysfunction. This mixture was administered orally to 5 week old male C57BL/6 mice at daily doses of 100 or 500 mg/kg for 2 weeks. The administration of PMC-12 was found to ameliorate memory impairment and cognitive deficits. In the Morris water maze test, the latency times of mice treated with 100 or 500 mg/kg were shorter than those of the vehicle-control mice. These findings suggest the complex enhances neurocognitive function and hippocampal neurogenesis.
The main health conditions this plant is used for are shown in the list below.
- Alzheimer's disease
- Diabetes mellitus
- Liver damage
- Cognitive impairment
- Kidney disease
What are the herbal preparations of this plant?
This plant is used to create various medicinal herbal preparations including 50% MeOH extract of steamed Rehmanniae Radix, Lycium-rehmannia pills, Qidan Dihuang Granule, Xueyakang capsule, and aqueous herb extracts. These diverse formulations serve different therapeutic purposes in traditional and modern medicine. The methanol extract and aqueous herb extracts represent different methods of isolating active compounds from the root. Specialized products like the Lycium-rehmannia pills and Qidan Dihuang Granule integrate the plant into complex traditional formulas. Additionally, the Xueyakang capsule provides a concentrated form of the plant for specific medicinal applications.
According to a study published by "Medicine", Lycium-rehmannia pills were analyzed through a meta-analysis of 15 randomized controlled trials involving 1222 patients and 2382 eyes. The results indicated that combining these pills with western medicine was superior in therapeutic efficiency with an OR = 4.38, 95% CI (3.26, 5.89), P < .00001. There were controversial results regarding the study group's performance in the Basic Schirmer test [MD, 2.46, 95% CI (1.49, 3.44), P < .00001], tear break up time [MD, 3.79, 95% CI (3.57, 4.01), P < .00001], and Fluorescein test [MD, -1.29, 95% CI (-1.42, -1.15), P < .00001]. Additionally, the pills combined with western medicine did not reduce the incidence of eyelid inflammation [OR = 1.00, 95% CI (0.37, 2.72), P = 1.00] or congestion symptom [OR = 0.55, 95% CI (0.18, 1.65), P = .28].
The main herbal preparations of this plant are shown in the list below.
- 50% MeOH extract of steamed Rehmanniae Radix
- Lycium-rehmannia pills
- Qidan Dihuang Granule
- Xueyakang capsule
- aqueous herb extracts
What side effects this plant can have?
This plant can cause significant health complications including a hypoglycemic effect, leukopenia, oxidative damage, body weight loss, and depression. The reduction in blood glucose levels through its hypoglycemic effect can lead to dangerous metabolic imbalances. Furthermore, the development of leukopenia may compromise the immune system by decreasing white blood cell counts. Exposure to the plant has also been linked to oxidative damage within cells and unintentional body weight loss. Finally, certain physiological reactions to the plant can manifest as clinical depression.
According to a study published by "Plant science : an international journal of experimental plant biology", Rehmannia glutinosa contains catalpol as one of its major bioactive components. This specific component exhibits multiple pharmacological activities, including hypoglycemic and neuroprotective effects. The study focused on the RgMYC2-Rg10HGO regulatory module which promotes the biosynthesis of catalpol in the plant. Research showed that RgMYC2 is a basic helix-loop-helix (bHLH) transcription factor that localizes in the nucleus. Overexpression of RgMYC2 or Rg10HGO significantly enhanced the catalpol content within the roots and leaves of Rehmannia glutinosa.
The main side effects this plant can have are shown in the list below.
- hypoglycemic effect
- leukopenia
- oxidative damage
- body weight loss
- depression
What herbs are paired with Rehmannia glutinosa?
This plant Rehmannia glutinosa is frequently paired with herbs such as Coptis chinensis, Panax ginseng, and Glycyrrhiza uralensis to enhance its therapeutic properties.
These combinations are often used in traditional formulas to balance the bitter nature of the resin and improve its efficacy in treating inflammatory conditions. When combined with Coptis chinensis, the pairing focuses on clearing heat and resolving toxicity within the body. Adding Glycyrrhiza uralensis helps to harmonize the different herbal components and mitigate potential side effects.
Practitioners select these specific pairings to target systemic issues like skin ailments or digestive irregularities.