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Cāng zhú

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Cāng zhú ( or or ), also known as black atractylodes rhizome or Rhizoma Atractylodes, is a Chinese herbal medicine. It is the dried rhizome of Atractylodes lancea (Thunb.) DC., Atractylodes chinensis (DC.) Koidz, or certain other local species including Atractylodes japonica Koidz.[1] (One study suggested that A. chinensis is a subspecies of A. lancea, and A. chinensis var. liaotungensis is a subspecies of A. coreana[2]) The medicine is distinguished from bái zhú ( or , white atractylodes rhizome from Atractylodes macrocephala), which is typically cultivated, whereas cāng zhú more often tends to be collected from the wild.[3] It is believed that the distinction between cāng zhú and bái zhú emerged in relatively modern times; a single drug "zhú" described in the Shen nong ben cao jing probably included many Atractylodes species.[4]

Production

Cultivation

Harvesting

The rhizome is dug up in the spring. After cleaning, it can be sliced and stir baked to a yellow brown color.[1]

Traditional attributes

In traditional Chinese medicine the herb is described as spicy or pungent, bitter, warm, and aromatic, acting on the spleen and stomach meridians.

A number of effects of the herb are described as ways of "drying dampness":[1][5]

  • As a stomachic - for "Damp obstruction or accumulation in the Middle Jiao", with symptoms such as low appetite, abdominal distension, epigastric distress and fullness, indigestion, dyspepsia, diarrhea, nausea and vomiting, weariness, a heavy sensation in the body, and a thick greasy tongue coating.
  • To eliminate exopathogens - to "dispel wind-damp-cold (bi-syndrome)", explained as "headaches and body aches, fever, chills, blocked nasal passages, and an absence of sweating"
  • To treat "damp heat conditions" in the lower Jiao, including "Damp Leg Qi, aching and swollen joints, and vaginal discharge" (leukorrhea). This includes relieving arthralgia, swollen knees, and foot pain. Treatment of these conditions can involve combinations such as San Miao San or Er Maio San.
  • To induce sweating.

It is also used:[1][5]

  • To treat night blindness or optic atrophy, either alone or as a component of Shi Ju Ming.
  • To relieve stagnant liver qi, reducing stress and relieving depression, in mixtures such as Jue Ju Wan.

Contraindications

"Yin deficiency, deficiency of essence, and external asthenia and sweating" (due to Wei Qi deficiency) are traditional contraindications. It has been noted to interfere with drugs for diabetes.[1] It can cause allergic reactions in those who are allergic to ragweed, marigolds, daisies, or related herbs (Asteraceae). It should not be used by pregnant women or women who are breastfeeding.[6]

Biochemical analysis

There has been relatively little scientific study of cāng zhú. The popular medical site WebMD states that there is "insufficient evidence" for use of Atractylodes against "indigestion, stomach ache, bloating, edema, diarrhea, loss of appetite, rheumatism, and other conditions," and also not sufficient evidence of the herb's safety.[6] A small number of reports in the primary scientific literature support the possibility of several medical uses, but pending confirmation they must be evaluated cautiously.

Atractylodes rhizomes showed possible hepatoprotective activity in an in vitro assay of a hepatocyte cell line treated with carbon tetrachloride or galactosamine, with significant hepatoprotective activity from the isolated sesquiterpenoid components atractylon, beta-eudesmol, and hinesol.[7] One review stated that the volatile oil contains the important chemical components, and that beta-eudesmol and hinesol are its active ingredients.[8]

Compounds isolated from a hexane extract of A. lancea included atractylochromene, a potent inhibitor of 5-lipoxygenase (IC50 3.3 micromolar) and cyclooxygenase (IC50 0.6 micromolar); 2-[(2E)-3,7-dimethyl-2,6-octadienyl]-6-methyl-2,5-cyclohexadiene-1,4-dione, a selective inhibitor of lipoxygenase (IC50 0.2 micromolar); atractylon and osthol, weak inhibitors of lipoxygenase, and atractylenolides I, II, and III.[9] Atractylenolide I from bai zhú was reported to help with cachexia (a side effect of stomach cancer) and alter cytokine levels in a small non-blinded study.[10] It was found to bind competitively with lipopolysaccharide for cell surface receptors with IC50 values of 5 to 7 micromolar for inhibiting TNF-alpha, IL-1beta, and nitric oxide production.[11]

A few sources have reported antimicrobial activity for the herb when burned as an incense:[12] one coil of antiseptic atractylodes incense per 45 cubic meters of space significantly reduced the transmission of viruses and microbes, with an effect similar to formalin or ultraviolet light exposure. A study of the phototoxicity of Chinese herbal medicines found that in mice treated with UVA ultraviolet radiation, A. japonica increased sunburn edema and formation of sunburn cells, and decreased local immune responses by decreasing epidermal Lagerhans cells and contact hypersensitivity; but it also exerted its phototoxic effects on Candida albicans, a potential therapeutic use.[13]

A prenylated dihydrobenzofuran derivative isolated from A. lancea, trans-2-hydroxyisoxypropyl-3-hydroxy-7-isopentene-2,3-dihydrobenzofuran-5-carboxylic acid, was found to be cytotoxic to two cancer cell lines tested.[14]

Other components of the rhizome include:

  • taraxerol acetate and phi-taraxasteryl acetate[14]
  • beta-sitosterol[14]
  • stigmasterol and stigmasterol 3-O-beta-D-glucopyranoside[14]
  • beta-eudesmol[14]
  • atractylenolide IV[14]
  • daucosterol[14]
  • several acylsucrose derivatives in which sucrose is modified by three to four 3-methylbutanoyl moieties.[15]
  • additional sesquiterpenes[16]

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 Joseph P. Hou and Youyu Jin (2005-04-25). The healing power of Chinese herbs and medicinal recipes. Routledge. ISBN 978-0-7890-2202-8. http://books.google.com/books?id=odRH0T_U7oEC&pg=PA441&lpg=PA441. 
  2. PMID 19806903 (PubMed)
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  3. "Medicinal herbs fact sheet". New Mexico State University. http://google.com/search?q=cache:DVKQczfTYcEJ:aces.nmsu.edu/medicinalherbs/documents/herbs-fact-sheet1.pdf+%22C%C4%81ng+zh%C3%BA%22+species&cd=16&hl=en&ct=clnk&gl=us. 
  4. PMID 17580746 (PubMed)
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  5. 5.0 5.1 "Cang Zhu (Black Atractylodes Rhizone)". Sacred Lotus Arts. http://www.sacredlotus.com/herbs/get.cfm/chinese_herb/cang_zhu_black_atractylodes_rhizone. 
  6. 6.0 6.1 "ATRACTYLODES". http://www.webmd.com/vitamins-supplements/ingredientmono-1097-ATRACTYLODES.aspx?activeIngredientId=1097&activeIngredientName=ATRACTYLODES&source=3#vit_overview. 
  7. PMID 6418860 (PubMed)
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  8. PMID 20069912 (PubMed)
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  9. Marion Resch, Alois Steigel, Zhong-liang Chen, and Rudolf Bauer (1998). "5-lipoxygenase and cyclooxygenase-1 inhibitory active compounds from atractylodes lancea". J. Nat. Prod. 61 (3): 347–350. doi:10.1021/np970430b. PMID 9544564. http://pubs.acs.org/doi/abs/10.1021/np970430b. 
  10. Yi Liu et al. (September 2008). "A Randomized Pilot Study of Atractylenolide I on Gastric Cancer Cachexia Patients". Evid Based Complement Alternat Med. 5 (3): 337–344. doi:10.1093/ecam/nem031. PMID 18830451. 
  11. PMID 19664972 (PubMed)
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  12. Jiang Su New Medical College. Encyclopedia of Chinese Materia Medica Shanghai: Shanghai Science and Technology Press; Wang, J. H. (ed.) 1994 Xin Bian Chang Yong Zhong Yao Shou Ce Beijing: Jin Dun Press; Wang, Y. S. 1983 Pharmacology and Applications of Chinese Materia Medica Beijing: People's Health Publisher; Dong, K. S. et al. 1998 Xian Dai Lin Chuang Zhong Yao Xue Beijing: Zhong Guo Zhong Yi Yao Press cited in Hou and Jin
  13. PMID 19818392 (PubMed)
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  14. 14.0 14.1 14.2 14.3 14.4 14.5 14.6 PMID 18787781 (PubMed)
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  15. PMID 19768991 (PubMed)
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  16. PMID 18511090 (PubMed)
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See also