Actinidia polygama (also known as silver vine and cat powder) is a nontoxic plant in the Actinidiaceae family. It grows in the mountainous areas of Japan and China at elevations between 500 and 1900 m.
Silver vine can reach up to 5–6 m high at maturity. It is a deciduous climber and is frost tender. The petiole leaves are silver and white in color and 6–13 cm long and 4–9 cm wide. These colorful markings make the plant identifiable from afar, until the flowering season when the leaves turn completely green.
The flowering season lasts from late June to early July, in which the plant bears white flowers about 2.5 cm in diameter. The longevity of an individual flower is 2–3 d, when the plant also starts to develop small, yellow to yellow-red, egg-shaped, fleshy, and multiseeded fruits, which mature from September to October. The fruit is about 1.5 cm wide and 3.0–4.0 cm long. The inside of the fruit resembles the common kiwifruit, but it is orange in color rather than green.
The silver vine plant requires moist, well-drained soil, and partial shade to full sun. This fast-growing vine makes for good cover on a fence or trellis. It is becoming increasingly popular as an edible fruit crop.
||This section needs more medical references for verification or relies too heavily on primary sources. (July 2012)|
Silver vine has been used for its medicinal benefits for centuries.[full citation needed] In traditional Chinese and Japanese medicine, it has been used for a wide range of health problems, including:
|Heart tonic||Rheumatism||Circulatory stimulant|
|Cholesterol reduction||Liver protection||Kidney disease|
It is said that:
“Old, weary travelers, (come) back to life to eat the fruit of [silver vine] and then continue their journey”.
The fruit in the “acorn” shape can be salted and eaten raw, fried in oil, added to rice, or mixed with sesame seeds and mayonnaise to top salads. The fruit may also be fermented to make Matatabi sake and miso, a fruit wine, or used to extract the juice. The leaves, buds, and stems can also be ground into a powder or cut, steamed, and seeped to make tea. Adding mint or sugar can give variations in the tea.
Grinding the leaves and stems into a coarser grind than needed for the tea makes Matatabi grass, which is used as bath salts. The vine is used as material for folk crafts, and the sap is collected to make lotions.
Silver vine has long been known to elicit euphoric response in cats. It is the most popular cat treat in Asia, thus sometimes cited in Japanese comics. The reaction to silver vine is similar to the catnip response, but appears to be more intense. Typical behaviors include rolling, chin and cheek rubbing, drooling, and licking. The effect usually lasts between five and 30 minutes, and cats will usually visit silver vine again after about 20–30 minutes.
Silver vine has been used for centuries in Asia as a preventative health aid and is still commonly used as an alternative therapy for hypertension, arthritic pain, and was investigated as treatment for cancer. Researchers have claimed, "Silver vine should find applications in various fields of foods and medicals and will be increasingly regarded as a health-promoting food".
Silver vine leaves also have a high content of flavonoids, terpenoids, saponins, and beta-carotene. This plant is also rich in alkaloids. Its vitamin C content is 10 times higher than that of green tea, and was "much higher than those of fruit species such as garden strawberry, kiwi berry, haskap [berry], blueberry, and lemon". Silver vine also has as much vitamin E as found in soybeans.
The health benefits of silver vine are not limited to its natural vitamins and minerals. It may be an effective treatment for hyperlipidemia, and may have viability as an anticancer drug. When the leaf powder was given orally, it inhibited the spread of cancer in small animals and reduced tumor weight  by more than 72% after day 32. Further, a lemon juice extract powder of silver vine tea showed hepatoprotection in rats which is attributed to antioxidant and free radical-scavenging properties.
The anti-inflammatory properties of this plant, used in the treatment of rheumatoid arthritis and to alleviate arthritis pain, were put to the test against inflammation in the lungs. Fruit extract from the plant had deep inhibitory effects on airway inflammation caused by allergic inflammation and asthma when combined with cyclosporine A.
- Konoshima, 1963
- Yoshizawa, Yuko; Fukiya, Yoshihiro; Izumi, Yoshikatsu; Hata, Keishi; Iwashita, Jun; Murofushi, Noboru; Abe, Tatsuya (2002). "Induction of Apoptosis with an Extract of Actinidia polygama Fruit in the Promyelocytic Leukemia Cell Line HL-60" (PDF). Journal of Health Science 48 (4): 303–309. doi:10.1248/jhs.48.303.
- Kim, YK; Kang, HJ; Lee, KT; Choi, JG; Chung, SH (2003). "Anti-inflammation activity of Actinidia polygama". Archives of pharmacal research 26 (12): 1061–6. doi:10.1007/bf02994759. PMID 14723341.
- Sakurai, H. (2005b.). Hepatoprotective effects of tea and extract powders from Silver Vine leaves. 26th World Congress and Exhibition of the ISF. Poster presentation, Prague, Czech Republic
- Sakurai, H. (2005). Antihyperlipemic and antitumor effects of components of matatabi leaves. 26th World Congress and Exhibition of the ISF. Poster presentation, Prague, Czech Republic
- Kim, H.; Song, M-J.; Potter, D. (2005). "Medicinal efficacy of plants utilized as temple food in traditional Korean Buddihsm". Journal of Ethnopharmacology 104 (1-2): 32–46. doi:10.1016/j.jep.2005.08.041. PMID 16216457.
- www.love-nature.jp 昔、疲れきった旅人が、マタタビの実を食べて生気を取り戻し、意気洋々とまた旅を続けたという名の由来が次に続く。
- See the Episode 8 of Hayate the Combat Butler (Season 2).
- Nagai, T. (2008). "Functional Properties of Water Extracts from Fully Ripened Silver Vine [Actinidia polygama (Sieb. Et Zucc.) Planch. Ex Maxim. Berries". Journal of Food Agriculture & Environment 6 (3-4): 11–14. Retrieved 1 April 2011.
- McGhie, T. K.; Ainge, G. D. (2002). "Color in fruit of the genus Actinidia: Carotenoid and chlorophyll compositions". Journal of Agriculture and Food Chemistry 50: 117–121. doi:10.1021/jf010677l.
- (Sarcoma 180, S-180)
- Lee, Y-C.; Kim, S-H.; Seo, Y-B.; Roh, S-S.; Lee, J-C. (2006). "Inhibitory effects of Actinidia polygama extract and cyclosporine A on OVA-induced eosinophilia and bronchial hyperresponsiveness in murine model of asthma". International Immunopharmacology 6 (4): 703–713. doi:10.1016/j.intimp.2005.10.007. PMID 16504935.
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