Uncaria rhynchophylla
What's the taxonomical classification of Uncaria rhynchophylla?
Uncaria rhyncophyllo belongs to the kingdom Plantae and is classified within the phylum Streptophyta. It falls under the class Equisetopsida and the subclass Magnoliidae, positioning it within the order Gentianales. Further classification places the plant in the family Rubiaceae, specifically within the genus Uncaria, and it is identified by the species name rhyncophylla.
| Taxonomic Rank | Classification |
|---|---|
| Kingdom | Plantae |
| Phylum | Streptophyta |
| Class | Equisetopsida |
| Subclass | Magnoliidae |
| Order | Gentianales |
| Family | Rubiaceae |
| Genus | Uncaria |
| Species | rhynchophylla |
What are the morphological characteristics of this plant?
Uncaria rhynchophylla has woody climbing vines characterized by opposite, elliptic to oblong leaves and distinctive curved, hook-like spines located at the base of the leaf petioles. These woody stems serve as lianas that utilize their specialized thorns to scramble over surrounding vegetation in tropical forest environments. The foliage typically displays a smooth texture with entire margins and a prominent midrib. During its flowering stage, the plant produces small, tubular flowers that emerge from axillary clusters. Its overall structural morphology is adapted for efficient upward growth through mechanical support from host trees.
What is the geographical distribution of this plant?
This plant is native to the tropical rainforest regions of the Amazon Basin, specifically spanning across parts of Brazil, Peru, and Colombia. It thrives primarily within the dense, humid understory and canopy layers of these equatorial ecosystems. Its distribution is closely tied to areas characterized by high annual rainfall and consistent warm temperatures. Within these habitats, the species is often found growing as a woody climber amidst diverse floral communities. Because it relies on specific moisture levels, its range is restricted to these particular lowland tropical environments.
How is this plant cultivated?
This plant Uncaria rhynchophylla requires a tropical or subtropical climate with high humidity, dappled sunlight, and well-draining, acidic soil to thrive.
As a woody climbing vine, it grows best when provided with sturdy supports like trees or trellises to facilitate its upward movement. Farmers often cultivate it in shaded forest understories to mimic its natural habitat and protect the delicate leaves from intense direct heat. Regular watering is essential to maintain moisture levels, though the root system must avoid standing in water to prevent rot.
Successful cultivation focuses on managing the dense canopy to ensure adequate airflow and light penetration for the climbing stems.
What parts of this plant are used medicinally?
This plant Uncaria rhynchophylla utilizes its stems, leaves, buds, branches, and hairy roots for various medicinal purposes. The stems and leaves are frequently processed to extract alkaloids used in treating inflammation and promoting sleep. Medicinal preparations often incorporate the buds to harness specific bioactive compounds. Some traditional treatments also utilize the branches to enhance the plant's therapeutic profile. Additionally, the hairy roots are harvested for their unique chemical properties in holistic remedies.
According to a study published by "Journal of oleo science", the branch with curved hook of the herbal medicine Uncaria rhynchophylla is used for the essential oil known as Uncaria Hook. Investigations of this oil identified eighty-four compounds representing 90.8% of the total content. The main components include (E)-cinnamaldehde at 13.4%, alpha-copaene at 8.0%, methyl eugenol at 6.8%, delta-cadinene at 5.3%, and curcumene at 3.6%. Aroma-active analysis showed alpha-copaene had an FD of 4 and an OAV of 4376, while (E)-linalool oxide had an FD of 64 and an OAV of 9.1. Additionally, methyl eugenol had an FD of 64 and an OAV of 29, and furfural had an FD of 8 and an OAV of 4808. These findings support further investigations of the essential oil in medicinal fields.
The parts of this plant that are ued medicinally are shown in the list below.
- branch
- bud
- hairy roots
- leaf
- stem
What traditional systems uses this plant?
This plant, Uncaria rhynchophylla, has been utilized for centuries in traditional Kampo and Taiwan folk medicine to treat various inflammatory and neurological conditions. In the Kampo system of Japan, it is often incorporated into formulas aimed at calming the spirit and reducing fever. Practitioners in Taiwan folk medicine traditionally employ the plant to alleviate symptoms related to headaches, dizziness, and high blood pressure. These historical applications frequently focus on its perceived ability to clear heat and soothe the nervous system. Through these diverse traditional practices, the species has established a long-standing reputation for its medicinal potency.
According to a study published by "Cellular and molecular neurobiology", Uncaria thorn (UT) is one of the seven medicinal herbs composing the traditional Japanese medicine yokukansan. UT was found to have a higher potency of protection against 100 μM glutamate-induced neuronal death when yokukansan was applied at 10-300 μg/ml. This plant contains four specific components, which are geissoschizine methyl ether, hirsuteine, hirsutine, and rhynchophylline. While these four UT-derived components provide neuroprotective effects, they did not bind to NMDA receptors in the assays.
The hystorical systems that uses this plant are shown in the list below.
- Kampo
- Taiwan folk medicine
What are the pharmacological activities of Uncaria rhynchophylla?
This plant has anti-inflammatory, anti-tumor, anticonvulsant, antihypertensive, and neuroprotective pharmacological activities. Its bioactive alkaloids work to reduce systemic inflammation and inhibit the proliferation of certain malignant cells. Research indicates that these compounds also possess the capacity to stabilize electrical activity in the brain to prevent seizures. Additionally, the plant helps regulate blood pressure through its antihypertensive properties. Finally, its neuroprotective effects offer potential benefits for maintaining cognitive health and protecting neurons from damage.
According to a study published by "Journal of ethnopharmacology", Uncaria rhyncophylla is a component of Medical Uncariae Ramulus Cum Uncis which possesses neuroprotective, antioxidant, anti-inflammatory, anticancer, antibacterial, and autophagy-enhancer properties. Pharmacological studies demonstrate that the plant provides benefits for diseases such as neurodegenerative diseases, cancer, cardiovascular diseases, diabetes, and migraine through anti-tumor and anti-viral properties. Between 2015 and the present, 107 newly marked chemical compositions, including alkaloids, terpenoids, flavonoids, and steroids, have been identified from URCU. The alkaloids found in URCU are biologically active and have the capability to self-assemble with other classes of components.
The primary pharmacological activities of this plant are shown in the list below.
- anti-inflammatory
- antioxidant
- anti-tumor
- anticonvulsant
- neuroprotective
What medicinal compounds this plant contains?
This plant contains several bioactive oxindole alkaloids including rhynchophylline, (4S)-rhynchophylline N-oxide, isorrhynchophylline, isorhynchophylline, and iso corynoxeine. These specific medicinal compounds are primarily responsible for the plant's diverse pharmacological activities in traditional medicine. Research indicates that these alkaloids can influence various physiological processes such as blood pressure regulation and neuroprotection. The presence of these diverse chemical structures allows the plant to interact with multiple biological targets within the body. Understanding the concentration of these specific molecules is essential for developing standardized herbal extracts.
According to a study published by "International journal of biological macromolecules", rhynchophylline (RIN) and isorhynchophylline (IRN) are evaluated as the pivotal medicinal ingredients in Uncaria rhyncophylla. These compounds display excellent antihypertensive and neuroprotective effects. Within Uncaria rhyncophylla, one UrLAMT gene and three UrCYP72A genes, specifically UrCYP72A1177, UrCYP72A1178, and UrCYP72A1179, were mined and cloned. The UrLAMT gene exhibits C11-carboxy O-methyltransferase activity for loganic acid, while UrCYP72A1177-UrCYP72A1179 display C7-C8 bond scission activity for loganin. These genes are involved in the biosynthesis of secologanin, which serves as a critical precursor for RIN and IRN.
The primary medicinal compounds of this plant are shown in the list below.
- Rhynchophylline
- (4S)-rhynchophylline N-oxide
- isorrhynchophylline
- isorhynchophylline
- iso-corynoxeine
What health conditions is this plant used for?
This plant is used for treating neurodegenerative diseases, including Alzheimer's disease and Parkinson's disease, by targeting neuroinflammation and cognitive impairments. Its bioactive compounds work to protect neurons from damage caused by inflammatory processes in the brain. Researchers study its potential to mitigate the progressive loss of brain cells associated with these chronic conditions. By reducing oxidative stress, the plant may help stabilize neurological functions. These therapeutic properties make it a significant subject in the search for treatments for memory loss and motor dysfunction.
According to a study published by "Acta pharmacologica Sinica", the major alkaloid of Uncaria rhyncophylla, rhynchophylline, possesses potent anti-AD effects to address Alzheimer's disease hallmarks. The study utilized three transgenic mouse models, including TgCRND8, 3xTg-AD, and 5xFAD, with treatments lasting for 4, 6, and 6 months respectively. Rhynchophylline alleviates cognitive deficits by reducing Aβ accumulation, decreasing hyperphosphorylated tau proteins at Thr181, Thr205, Ser396, and Ser404 sites, and diminishing neuroinflammation. It further improves cognitive functions by reducing anxiety-like behaviors and ameliorating learning impairments. Additionally, the treatment can restore gut microbiota dysbiosis in 5xFAD mice.
The main health conditions this plant is used for are shown in the list below.
- Alzheimer's disease
- Parkinson's disease
- neurodegenerative diseases
- neuroinflammation
- cognitive impairments
What are the herbal preparations of this plant?
This plant is Uncaria rhynchophylla, which is used to produce various medicinal preparations including 50% aqueous methanol extracts and 95% ethanolic extract. These substances are frequently processed into traditional formulations such as Gou-Teng and Uncariae Ramulus Cum Uncis. Researchers also isolate the specific alkaloid fraction to study its concentrated pharmacological properties. These different preparations are valued for their diverse chemical profiles and therapeutic applications.
According to a study published by "European journal of mass spectrometry (Chichester, England)", Uncaria rhyncophylla is documented in Chinese pharmacopoeia as an authentic source for the crude drug Gou-Teng used for mental and cardiovascular diseases. A total of 38 constituents were characterized, including 26 alkaloids, six flavonoids, two triterpenoids, two chlorogenic acid analogs, and two other compounds. While traditional theory uses only the hook-bearing stems, the leaves displayed the most potent activity on MT1 and MT2 receptors with agonistic rates of 39.7% and 97.6%. For 5-HT1A and 5-HT2C receptors, the hooks showed the strongest activity with agonistic rates of 92.6% and 83.1% respectively. This investigation highlights the chemical divergence between the different parts of Uncaria rhyncophylla for psychiatric purposes.
The main herbal preparations of this plant are shown in the list below.
- 50% aqueous methanol extracts
- 95% ethanolic extract
- Gou-Teng
- Uncariae Ramulus Cum Uncis
- alkaloid fraction
What side effects this plant can have?
This plant can cause adverse health side effects including dizziness, headache, hypertension, gastrointestinal illness, and a central depressive effect. Some individuals may experience neurological symptoms such as persistent headaches or feelings of lightheadedness and dizziness. The chemical constituents can also lead to elevated blood pressure, specifically manifesting as hypertension. Digestive issues, categorized as gastrointestinal illness, may occur following consumption. Furthermore, the substance has been linked to a central depressive effect that can impact mood and nervous system function.
According to a study published by "Natural products and bioprospecting", Uncaria rhyncophylla contains three new indole alkaloids identified as geissoschizic acid (1), geissoschizic acid N4-oxide (2), and 3β-sitsirikine N4-oxide (3), along with 26 known analogues. During a neural stem cells (NSCs) proliferation assay, several compounds showed unexpected inhibitory activities at 10 μM. These specific compounds include geissoschizic acid (1), geissoschizic acid N4-oxide (2), isocorynoxeine (6), isorhynchophylline (7), (4S)-akuammigine N-oxide (8), and (4S)-rhynchophylline N-oxide (10). These findings provide a clue for possible NSCs toxicity and the neural lesions risk of Uncaria rhyncophylla.
The main side effects this plant can have are shown in the list below.
- dizziness
- headache
- hypertension
- gastrogastrointestinal illness
- central depressive effect
What herbs are paired with Uncaria rhynchophylla?
This plant Uncaria rhynchophylla is most commonly paired with herbs like Panax ginseng, Rehmannia glutinosa, and various species of Salvia to enhance its sedative and neuroprotective properties.
These combinations are frequently utilized in traditional formulas to balance the plant's ability to calm the nervous system with other tonifying agents. When combined with Rehmannia, the mixture aims to nourish the blood while addressing insomnia or anxiety. Adding Panax ginseng helps to prevent excessive fatigue that might otherwise result from intense sedative effects.
Such synergistic pairings are specifically designed to target neurological health and improve sleep quality through a multifaceted approach.