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Effect of Tong Luo Jiu Nao on Aβ-degrading enzymes in AD rat brains.
J Ethnopharmacol. 2011 Sep 02; 137(2):1035-46.JE

Abstract

ETHNOPHARMACOLOGICAL RELEVANCE

Tong Luo Jiu Nao (TLJN) is a modern Chinese formula based on Traditional Chinese Medicine theory that has been used to treat ischemic cerebral stroke and vascular dementia. TLJN belongs to the ethnopharmacological family of medicines. In this study, we investigated the mechanism of the TLJN effect on Alzheimer's disease (AD).

AIM OF THE STUDY

To investigate the effect of TLJN on β-amyloid-degrading enzymes and learning and memory in the AD rat brain.

MATERIALS AND METHODS

AD rats whose disease was induced by Aβ(25-35) injection into the bilateral hippocampus CA1 region were subjected to intragastric administration of various preparations. The experimental animals were healthy male Sprague-Dawley rats which were randomly divided into normal, sham, model, TLJN min, TLJN max and donepezil hydrochloride groups. Spontaneous alternation and passive avoidance behavior, which are regarded as measures of spatial learning and memory, were investigated using Y-maze testing. Western blotting and immunohistochemistry were used to observe the therapeutic effect of TLJN on the deposits of amyloid plaque and on the expression of synaptophysin, insulin-degrading enzyme and neprilysin.

RESULTS

Y-maze results showed that the AD model group presented with spatial learning and memory impairments. Hematoxylin-eosin and Congo red staining indicated neuronal impairment and deposits of amyloid plaque in the model group and these results were consistent with their learning and memory deficits in the Y-maze. The TLJN-treated groups exhibited prolonged a cavity delitescence, decreased arm entries and improvement in learning and memory. Moreover, the structure of the neurons of the treated groups was restored and the expression of synaptophysin increased in both the hippocampus and cortex. In addition, their levels of insulin-degrading enzyme and neprilysin in the cortex and hippocampus were upregulated and the amyloid plaque was decreased.

CONCLUSION

TLJN can improve learning and memory, up-regulate insulin-degrading enzyme and neprilysin levels, promote the degrading of Aβ and clear amyloid plaque from the AD rat brain. In future, TLJN may have significant therapeutic potential in the treatment of AD patients.

Authors+Show Affiliations

Department of Pathology, School of Preclinical Medicine, Beijing University of Chinese Medicine, 11 Bei San Huan Dong Road, Chaoyang District, Beijing 100029, China.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21798326

Citation

Liu, Yuan, et al. "Effect of Tong Luo Jiu Nao On Aβ-degrading Enzymes in AD Rat Brains." Journal of Ethnopharmacology, vol. 137, no. 2, 2011, pp. 1035-46.
Liu Y, Hua Q, Lei H, et al. Effect of Tong Luo Jiu Nao on Aβ-degrading enzymes in AD rat brains. J Ethnopharmacol. 2011;137(2):1035-46.
Liu, Y., Hua, Q., Lei, H., & Li, P. (2011). Effect of Tong Luo Jiu Nao on Aβ-degrading enzymes in AD rat brains. Journal of Ethnopharmacology, 137(2), 1035-46. https://doi.org/10.1016/j.jep.2011.07.031
Liu Y, et al. Effect of Tong Luo Jiu Nao On Aβ-degrading Enzymes in AD Rat Brains. J Ethnopharmacol. 2011 Sep 2;137(2):1035-46. PubMed PMID: 21798326.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of Tong Luo Jiu Nao on Aβ-degrading enzymes in AD rat brains. AU - Liu,Yuan, AU - Hua,Qian, AU - Lei,Hongtao, AU - Li,Pengtao, Y1 - 2011/07/20/ PY - 2011/01/27/received PY - 2011/07/10/revised PY - 2011/07/11/accepted PY - 2011/7/30/entrez PY - 2011/7/30/pubmed PY - 2012/1/6/medline SP - 1035 EP - 46 JF - Journal of ethnopharmacology JO - J Ethnopharmacol VL - 137 IS - 2 N2 - ETHNOPHARMACOLOGICAL RELEVANCE: Tong Luo Jiu Nao (TLJN) is a modern Chinese formula based on Traditional Chinese Medicine theory that has been used to treat ischemic cerebral stroke and vascular dementia. TLJN belongs to the ethnopharmacological family of medicines. In this study, we investigated the mechanism of the TLJN effect on Alzheimer's disease (AD). AIM OF THE STUDY: To investigate the effect of TLJN on β-amyloid-degrading enzymes and learning and memory in the AD rat brain. MATERIALS AND METHODS: AD rats whose disease was induced by Aβ(25-35) injection into the bilateral hippocampus CA1 region were subjected to intragastric administration of various preparations. The experimental animals were healthy male Sprague-Dawley rats which were randomly divided into normal, sham, model, TLJN min, TLJN max and donepezil hydrochloride groups. Spontaneous alternation and passive avoidance behavior, which are regarded as measures of spatial learning and memory, were investigated using Y-maze testing. Western blotting and immunohistochemistry were used to observe the therapeutic effect of TLJN on the deposits of amyloid plaque and on the expression of synaptophysin, insulin-degrading enzyme and neprilysin. RESULTS: Y-maze results showed that the AD model group presented with spatial learning and memory impairments. Hematoxylin-eosin and Congo red staining indicated neuronal impairment and deposits of amyloid plaque in the model group and these results were consistent with their learning and memory deficits in the Y-maze. The TLJN-treated groups exhibited prolonged a cavity delitescence, decreased arm entries and improvement in learning and memory. Moreover, the structure of the neurons of the treated groups was restored and the expression of synaptophysin increased in both the hippocampus and cortex. In addition, their levels of insulin-degrading enzyme and neprilysin in the cortex and hippocampus were upregulated and the amyloid plaque was decreased. CONCLUSION: TLJN can improve learning and memory, up-regulate insulin-degrading enzyme and neprilysin levels, promote the degrading of Aβ and clear amyloid plaque from the AD rat brain. In future, TLJN may have significant therapeutic potential in the treatment of AD patients. SN - 1872-7573 UR - https://www.unboundmedicine.com/medline/citation/21798326/Effect_of_Tong_Luo_Jiu_Nao_on_Aβ_degrading_enzymes_in_AD_rat_brains_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0378-8741(11)00507-1 DB - PRIME DP - Unbound Medicine ER -