- Open Access
Chinese medicines in the treatment of experimental diabetic nephropathy
Chinese Medicine volume 11, Article number: 6 (2016)
Diabetic nephropathy (DN) is a severe micro vascular complication accompanying diabetes mellitus that affects millions of people worldwide. End-stage renal disease occurs in nearly half of all DN patients, resulting in large medical costs and lost productivity. The course of DN progression is complicated, and effective and safe therapeutic strategies are desired. While the complex nature of DN renders medicines with a single therapeutic target less efficacious, Chinese medicine, with its holistic view targeting the whole system of the patient, has exhibited efficacy for DN management. This review aims to describe the experimental evidence for Chinese medicines in DN management, with an emphasis on the underlying mechanisms, and to discuss the combined use of herbs and drugs in DN treatment.
Diabetic nephropathy (DN) is a serious micro vascular complication in patients with diabetes mellitus (DM), affecting approximately 40 % of patients with type 1 or type 2 DM [1, 2]. It is the predominant cause of chronic kidney disease and renal failure, and is closely associated with many micro vascular diseases, leading to financial and medicinal burdens . Continued hyperglycemia associated with DM is the major cause of kidney dysfunction with metabolic and hemodynamic disorders arising from oxidative stress and inflammation .
During DN progression, progressive alterations developfrom hyperfiltration through micro albuminuria to macro albuminuria, and finally to renal failure . Renal structural changes are found in the nephrons, especially in the primary part of the glomerulus, including podocyte loss, glomerular basement membrane (GBM) thickening, endothelial cell dysfunction, and mesangial extracellular matrix (ECM) expansion, resulting in protein leakage into the urine . Pulmonary dysfunction , hyperlipidemia and non-alcoholic fatty liver disease , cardiovascular disease , and even heart failure  have been reported to be positively associated with DN progression. Therefore, synergistic therapies targeting multiple mediators of DN are required for effective therapeutic strategies .
The experimental models used for studying Chinese medicines (CMs) in DN treatment are diverse. For in vivo studies, different doses of streptozotocin (STZ) are administered to mimic type 1 or type 2 DM. Examples of the CMs that have been investigated are Glycyrrhizauralensis (gan-cao), Carumcarvi (zang-hui-xiang), Allium sativum (da-suan), and Mesonaprocumbens (xian-cao) [11–14]. In addition, alloxan (ALX)-induced mice, db/db mice, KK-Ay mice, and Otsuka Long-Evans Tokushima Fatty (OLETF) rats have been reported for investigation of CMs in DN treatment [15–18]. Meanwhile, glomerular endothelial cells, mouse podocyte cells, renal proximal epithelial cells, murine hepatocytes, mouse mesangial cells, and human mesangial cells are used as in vitro models for anti-DN mechanism studies [19–27]. By applying these models, the majority of studies have reported that CMs such as Acacia nilotica pods (jin-he-huan) , Artemisia campestris (huang-ye-hao) , Paeonialactiflora (shao-yao) , and Schisandra chinensis (wu-wei-zi) [21, 31] exhibited beneficial effects on all stages of experimental DN and may protect multiple organs. Grapevine leaf (Vitis labrusca) extract was reported to exert hepatoprotective, cardioprotective, and renoprotective effects . Moreover, CM preparations such as Fufang Xueshuantong Capsule (fu-fang-xue-shuan-tong-jiao-nang), Zhengqing Recipe (zheng-qing-fang), and Danggui Buxue Tang demonstrated benefits for DN patients [33–35]. Representative CMs for the treatment of DN at different stages of disease progression and their underlying mechanisms are shown in Fig. 1.
This article aims to review the experimental evidence for the effectiveness of CMs in DN management, with emphasis on their underlying mechanisms, and to discuss the combined use of CM herbs and chemical drugs in DN treatment.
Search strategy and selection criteria
We searched for the terms “traditional Chinese medicine”, “holistic therapy”, and “traditional Chinese medicine prescriptions (or formula)” in combination with “diabetic nephropathy” and “diabetes” in PubMed, Google Scholar, and Web of Science between 1990 and 2014. Manual searches of in-text references from the selected articles were further performed. Studies were included if in vivo models were used to investigate the nephroprotective effects and mechanisms of CMs. Unpublished reports, Letters to the Editor, and the studies that only used in vitro models or did not provide information about the duration of animal studies were excluded.
CMs in experimental DN management
CMs intervention in the early stage of experimental DN
The potential signaling pathways involved in DN pathogenesis regulated by CMs are shown in Fig. 2. The early stage of DN is characterized by hyperfunction and hypertrophy arising from oxidative stress and inflammation [3, 36, 37]. Under chronic hyperglycemia, the extracellular glucose forms advanced glycation end-products (AGEs). Activation of receptor of advanced glycation end-products (RAGE) on the plasma membrane has been proposed to contribute predominantly to the overproduction of reactive oxidative species (ROS) . Meanwhile, the polyol pathway of glucose metabolism activated by the intracellular glucose further aggravates the oxidative stress. Other major sources of excess ROS were reported to be enhanced protein kinase C (PKC) activity caused by activation of the polyol pathway  and mitochondrial ROS production in response to mitochondrial damage. As a consequence, nuclear factor (NF)-κB becomes activated, followed by stimulation of pro-inflammatory cytokines (e.g., interleukin [IL]-6), chemokines (e.g., monocyte chemoattractant protein [MCP]-1), adhesion molecules (e.g., intercellular adhesion molecule 1 [ICAM1], vascular cell adhesion protein 1 [VCAM1]), and nuclear receptors (e.g., peroxisome proliferator-activated receptor [PPARs]) . Thereafter, the inflammation induces endoplasmic reticulum (ER) stress via unfolded protein response pathways, resulting in metabolic disorders and apoptosis. Besides, subsequent macrophage infiltration into renal tissues leads to prolonged micro inflammation, thus aggravating the progression of DN. Numerous CMs are applied at this point to control this reversible stage of DN . Asparagus racemosus (lu-sun), Radix Astragali (huang-qi), Rosa laevigata (jin-ying-zi), and Piper auritum (hu-jiao) were reported to enhance the activities of superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px), leading to attenuation of the oxidative stress [5, 42–44].
CMs intervention in the incipient stage of experimental DN
The development of micro albuminuria was reported as an indicator of the incipient stage of DN, arising from endothelial dysfunction [38, 45]. Renal hypertrophy and hyperfiltration induced functional and structural alterations, resulting in micro albuminuria and hypertension, leading to glomerulus sclerosis, and progressing to incipient DN. Cornus officinalis (shan-zhu-yu), Abelmoschus manihot (huang-shu-kui), Schisandrae chinensis (wu-wei-zi), and Paeonia lactiflora (shao-yao) were reported to exhibit anti-micro albuminuria effects, thereby slowing down DN progression [19, 21, 46, 47].
CMs intervention in the overt and end-stage renal disease (ESRD) stages of experimental DN
After the incipient stage of DN and under hyperglycemic conditions, mesangial nodules and tubule interstitial fibrosis develop, leading to proteinuria and nephrotic syndrome, and eventually to the overt stage of DN, which is characterized by persistent proteinuria . Without effective control, patients in this stage will deteriorate to ESRD with uremia. As the kidney disease progresses, physical changes in the kidneys often lead to increased blood pressure and cardiovascular disease. In this stage, angiotensin-converting enzyme (ACE) inhibition is the conventional intervention . The goal of treatment is to prevent the progression from micro albuminuria to macro albuminuria, and multiple and more intensive strategies are strongly advised. Avosentan was reported to reduce albuminuria in patients with type 2 DM and overt nephropathy by inhibiting ACE and blocking angiotensin receptors, but can also induce significant fluid overload and congestive heart failure . Averrhoa carambola L. (yang-tao), Salvia miltiorrhiza (dan-shen), and Picrorrhiza Rhizoma (hu-huang-lian) can ameliorate DN symptoms safely [50–52]. Representative CMs and their related mechanisms are summarized in Table 1.
Besides targeting the specific molecules involved in DN pathogenesis to exert anti-hyperglycemic and nephroprotective effects, CM has unique characteristics in DN management. In CM, DN is not only a kidney disease, but also an embodiment of the systemic disease in the kidney, which is in accordance with the latest findings for DN pathogenesis [7, 8, 38]. The pathogenesis of DN may be closely related to the dysfunction or impairment of other organs, and therefore treatments for diseases in other organs may be helpful for the amelioration of DN, especially in the overt and ESRD stages. The normal functioning of the human body relies on the coordination of yinand yang, and the five zang organs (wuzang), i.e., the liver (gan), heart (xin), spleen (pi), lung (fei), and kidney (shen), are respectively related to wood (mu), fire (huo), earth (tu), metal (jin), and water (shui) and connected under the laws of inter promotion and interaction (Fig. 3) . Once a significant imbalance occurs, certain symptoms of the kidneys inevitably and predictably arise.
Under hyperglycemic conditions, the oxidative stress and inflammation affect the blood circulatory system, consequently leading to the dysfunction of multiple organs. Cardiovascular disease causes even more deaths than ESRD in patients with DN . The degree of pulmonary function impairment was found to be positively associated with the stage of DN progression . Besides, liver X receptor (LXR) agonists, which are commonly used to treat hyperlipidemia and non-alcoholic fatty liver disease, were shown to ameliorate DN by inhibiting the expressions of osteopontin and other inflammatory mediators in the kidney cortex . Moreover, during DN pathogenesis, glomerular hypertrophy was found to be associated with hyperinsulinemia , and has been proposed as a novel therapeutic target for DN . As a systematic micro vascular thrombosis combined with metabolic disorders, DN influences the whole internal environment, and its pathogenesis may be closely related to the dysfunction of other organs.
From this perspective, CM as a therapeutic approach targeting multiple organs is preferred to improve the overall health of DN patients. Experimentally, grapevine (Vitis labrusca L.) leaves exhibited hepatoprotective, cardioprotective, and renoprotective effects in Wistar rats . Besides, extracts from S. miltiorrhiza exhibited a regulatory effect on the expression of LXR-α in hyperlipidemic rats . Furthermore, Liuwei Dihuang Decoction exhibited a protective effect on early DN in STZ rats . Additionally, a CM prescription, kangen-karyu, exhibited hepatoprotective/renoprotective activities through the inhibition of AGE formation and fibrosis-related protein expressions in type 2 diabetes . Yamabe and colleagues systematically conducted a series of experiments to investigate the anti-diabetic effects of a CM prescription, hachimi-jio-ga, and reported findings for the whole prescription and its constituents as well as for the bioactive compound [59–64]. Other selected CM prescriptions for DN treatments and their respective molecular mechanisms are shown in Table 2. In particular, single herbs (e.g., Auricularia auricula, hei-mu-er) and CM prescriptions (e.g., Danggui Buxue Tang and Gui Qi Mixture) produced better beneficial effects than conventional anti-DN drugs by regulating blood lipid metabolism and lipoprotein lipase activity through the regulation of blood glucose based on their complex compound matrices [65–67]. The changes in blood glucose, triglyceride (TG), total cholesterol (TC), and high-density lipoprotein (HDL) were reversed by Gui Qi Mixture, but not by the ACE inhibitor benazepril in diabetic rats . Similarly, the increases in fasting blood glucose (FBG), TG, and TC were attenuated, and the renal kidney/body weight (K/B) ratio, urinary albumin excretion (UAE), and creatinine clearance rate (CCr) in STZ-induced diabetic rats were ameliorated after 8 weeks of treatment with Danggui Buxue Tang compared with benazepril . Collectively, CMs may exert synergetic effects targeting multiple organs, and benefiting the whole internal milieu of DN patients.
At the ESRD stage, it is almost impossible to prevent the disease from becoming more severe, and dialysis may be the final resort for these patients. To provide a more cost-effective therapeutic approach, other potent remedies are urgently needed. In this regard, the combined use of herbs and drugs, and the development of new therapies are receiving increasing attention.
Modern drugs specifically aim to target disease-related molecules through definite pathways, whereas CM aims to exert synergetic effects and benefit the whole internal milieu of patients, leading to the possibility that the combined use of CMs and modern drugs may exert better therapeutic effects on diseases, especially for chronic and comprehensive DN. Currently, the combined use of herbs and drugs in the treatment of DN has been well-investigated. For example, the CM prescription tangshenling was combined with telmisartan to treat 80 patients with DN, and exhibited a better effect than telmisartan treatment alone . Basic research corroborated that the tangshenling mixture had a synergetic effect with benazepril through a different signaling pathway, which involved down regulation of atrial natriuretic factor (ANF) in plasma and glucose transporter 1 (GLUT1) in the kidney when treating DN . Herbs may reduce the permeability of the drug into the intestinal tract, and may also affect its metabolism in the liver and cause hypoglycemia. Huang Kui capsule reduced the absorption of glibenclamide and accelerated its metabolism. This herb–drug interaction deserves further research on the herb–drug pharmacokinetic interaction to enhance the therapeutic effects and avoid side effects.
Limitations of this review
In many studies included in this review, the bioactivities of the CMs responsible for the anti-DN effects and their molecular targets were not identified. Phytochemical and molecular biological studies are needed to identify the bioactive constituents and to elucidate the underlying mechanisms. Moreover, this review only focused on studies using in vitro or in vivo DN models. Results from clinical trials investigating the use of CMs for the treatment of DN are needed to confirm the therapeutic effects of CMs in the future.
CMs provides an alternative for DN management in all stages of experimental DN models, especially in the early and incipient stages of DN, and the synergistic administration of CM herbs with conventional drugs exhibited better efficacy than drugs alone in DN treatment.
atrial natriuretic factor
advanced glycation end products
- Ang II:
angiotensin receptor blocker
urinary microalbumin to creatinine ratio
blood urea nitrogen
bone morphogenetic protein
creatinine clearance rate
calcitonin gene-related peptide
connective tissue growth factor
end-stage renal disease
extracellular matrix metalloproteinase inducer
extracellular signal-regulated kinases
fasting blood glucose
glomerular filtration rate
glomerular mesangial cells
glomerular basement membrane
high density lipoprotein
high fat diet
inducible nitric oxide synthase
intercellular adhesion molecule
insulin-like growth factor
liver X receptor
low density lipoprotein
endothelial nitric oxide synthase
constitutive nitric oxide synthase
total nitric oxide synthase
mitogen-Activated Protein Kinase
monocyte chemotactic protein
otsuka Long-Evans Tokushima Fatty
peroxisome proliferator-activated receptor
plasminogen activator inhibitor
protein kinase 1
reactive oxidative species
receptor of advanced glycation end-products
serum and glucocorticoid induced protein kinase
α-smooth muscle actin
serum creatinine clearance rate
transforming growth factor
thiobarbituric acid reactive substances
tissue inhibitor of metalloproteinase
thromboxane B 2
- β (2)-MG:
urine β (2)-microglobin
unfolded protein response
urinary albumin excretion
vascular endothelial growth factor
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YBZ and SCWT designed and conceived the study. JYL, XXC, SCWS, YBF, and KFL select and analyzed the data. JYL, XXC, SCWS, KFL, and YBF wrote the manuscript. YBZ and SCWT revised the manuscript. All authors agree to be responsible to all aspects of the work to ensure that no questions concerning the accuracy or integrity of the work remain unsolved. All authors read and approved the final manuscript.
This study was supported by grants from Seed Funding Programme for Basic Research from HKU (Project No. 201111159043); the Innovation and Technology Support Programme (Project code: ITS/313/11); and the Government of Hong Kong Special Administrative Region. The funders had no role in the design, analysis or writing of this article.
The authors declare that they have no competing interests.
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Liu, J., Chen, X., Tang, S.C. et al. Chinese medicines in the treatment of experimental diabetic nephropathy. Chin Med 11, 6 (2016) doi:10.1186/s13020-016-0075-z
- Diabetic Nephropathy
- Reactive Oxidative Species
- Incipient Stage