Ethanol extract of Cissampelos sympodialis ameliorates lung tissue damage in streptozotocin-induced diabetic rats

Abstract

Diabetes Mellitus (DM) is a metabolic syndrome characterized by hyperglycemia. Chronic complications affect a number of organs, including the lungs. Cissampelos sympodialis Eichl (Menispermaceae) is a plant used to treat respiratory diseases. The aim of this study was to evaluate the effect of Cissampelos sympodialis extract (CSE) in lungs of diabetic rats. We used 30 Wistar rats divided into three groups: control group (CG), diabetic group (DG) and diabetic Cissampelos sympodialis treatment group (DTG). Diabetes was induced by streptozotocin (40 mg/kg i.v.). The CSE (400 mg/kg, po) was administered daily, during four weeks, beginning one week after the onset of DM. The treatment with CSE was not able to reduce blood glucose levels after streptozotocin injection. However, it was able to decrease cholesterol and triglycerides and prevent damage on pancreatic islets morphology. Additionally, morphological alterations such as alveolar septa loss, inflammatory infiltrate and fibrosis were seen in lung tissue of rats with DM, and treatment with CSE apparently reversed these histopathological findings. Thus, CSE treatment reduced the lipid profile and restored the lung architecture of diabetic animals by a mechanism independent of glycemia and which might be associated with the reduction of the damage on the pancreatic islets.

Keywords:
Cissampelos sympodialis; Diabetes; Lung; Pancreatic islets; Lipid profile

INTRODUCTION

Diabetes Mellitus (DM) is a diffuse endocrine disease, characterized by metabolic abnormalities and long-term complications due to hyperglycemia. Approximately 30% of all newborn children have the genetic risk for type 1 DM and a smaller percentage of those children progress to the clinical disease (Mejía-León et al., 2015). Additional factors are also involved in type 1 DM pathogenesis, such as viral infections, intestinal inflammation, and nutritional factors, which are required to trigger the disease in genetically predisposed individuals (Kinip, Simell, 2012). Among the main and most common chronic complications of DM are micro and macrovascular disorders related to the renal, cardiovascular and nervous systems (Chawla, Chawla, Jaggi, 2016). However, in the last two decades, clinical and experimental studies have revealed morphofunctional alterations in the respiratory system (Popov, Simionescu, 1997; Davis et al., 2000; Naso et al., 2010b).The impact of DM on the respiratory system is characterized by abnormalities in pulmonary function, as well as decreased elasticity, lung volume and gas transfer (Goldman, 2003; Walter et al., 2003). Structural changes in the basal membrane of the pulmonary capillary endothelium also occur in DM, with thickened alveolar-capillary membrane inflammatory infiltrate, edema, hemorrhage and congestion (Weynand et al., 1999; Özşahin et al., 2006; Hagiwara et al., 2011). Although these alterations were confirmed clinically and in experimental models, few studies have investigated the physiopathological mechanisms involving pulmonary complications in the type 1 DM model (Naso et al., 2010a).

A number of therapies with plant extract have been used to reverse the complications caused by DM (Halim et al., 2002; Naso et al., 2010a; Shukri et al., 2011). Cissampelos sympodialis Eichl. (Menispermaceae) is a plant popularly known in Northeast Brazil as ‘Milona’ (Porto, Lima, Agra, 2008). This species is commonly found in semiarid regions of the country and its leaves and roots are used in traditional medicine to treat arthritis, rheumatism and respiratory diseases (Agra, França, Barbosa-Filho, 2007). Phytochemical analysis of the extract showed a significant presence of alkaloids (Barbosa Filho, Agra, Thomas, 1997; Marinho et al., 2012). Quality control studies have shown that both alcoholic fractions of the leaves and alcoholic fractions of the roots present alkaloids as their principal compounds, and warifteine is their common chemical marker. (Barbosa Filho, Agra, Thomas, 1997; Marinho, Barbosa-Filho, Oliveira, 2012; Aragão, 2012) Crude ethanolic extract was standardized using warifteine and methylwarifteine as markers that were also found in the total alkaloid fraction (TAF-Cs) [16, 17]. Studies were carried out with these components and showed different pharmacological effect on the hepatic (Melo et al., 2003), nervous (Almeida et al., 2005), cardiovascular (Cavalcante et al., 2011), immune (Vieira et al., 2012) and gastrointestinal systems (De Sales et al., 2015). Several studies demonstrated that the respiratory system exhibited improved function in an experimental model of allergic asthma (Batista-Lima et al., 2001; Costa et al., 2008; Cerqueira-Lima et al., 2010; Bezerra-Santos et al., 2012, Vieira et al., 2013).

Considering the therapeutic effect of Cissampelos Sympodialis extract (CSE) and its secondary metabolites on the physiopathology of the respiratory system, the present study aimed assessing, for the first time, the effect of CSE on a model of rats with streptozotocin-induced DM, evaluating clinical and biochemical parameters, in addition to morphological analysis of lung and pancreatic tissue.

MATERIAL AND METHODS

Animals

All animal procedures were approved by the Animal Research Ethics Committee of Federal University of Rio Grande do Norte (CEUA-UFRN), under the number 010/2012 and were done in accordance with the International Guiding Principles for Biomedical Research Involving Animals (CIOMS, ICLAS, 2012). Thirty male Wistar rats (200-300 g) were obtained from the breeding colony of the Center for Health Sciences - UFRN. The animals were housed in standard polypropylene cages and maintained under controlled room temperature (22 ± 2 ºC) and humidity (55 ± 5%) with 12:12 h light and dark cycle.

Alcoholic extract of leaves of Cissampelos sympodialis Eichl.

Cissampelos sympodialis Eichl, was obtained at the Botanical Garden of UFPB/Brazil (voucher species Agra 1456). Approximately 3 kg of fresh leaves were collected, dried at 50ºC and pulverized. The leaves were powdered and subjected to three successive alcohol extractions in a percolator at room temperature (25-30 ºC). The CSE was obtained with a mixture of water and ethanol (30/70 v/v). Then solvent was removed by using rotavapor at a temperature of 60 ºC under reduced pressure, and the dry weight of the extract was 79.9% based on the present solid waste. The extract showed 34% of solubility in water.

Experimental protocol and groups

DM was induced by a single injection of streptozotocin i.v. (STZ, Sigma Chemical Company, St. Louis, MO, EUA) at a dose of 40 mg/kg of body weight. STZ was dissolved in sodium citrate buffer (0.1 M, pH 4.5) (Carvalho, Carvalho, Ferreira, 2003). The levels of plasma glucose were determined and those rats with fasting glucose > 250 mg/dL served as diabetic rats. Treatment with CSE (400 mg/kg) was started one week after STZ injection (Figure 1). The animals were separated into three groups (n = 10 per group). CSE was dissolved in vehicle solution and administered orally using an intragastric tube during a period of 30 days.

FIGURE 1
Experimental design.

• - CG, control group (vehicle treated.)

• - DG, diabetic group

• - DTG, diabetic + CSE treatment (400 mg/kg) group

At the end of the experimental period, the animals were euthanized by exsanguination after anesthesia with ketamine and xylazine. Then, blood was collected and right lungs were dissected out.

Biochemical and clinical analyses

During the experimental period, body weight and water intake of each group were evaluated. These parameters were analyzed following the (Lerco et al., 2003). The blood samples were placed into a testing tube with heparin (Liquemine) to avoid coagulation. The material was then centrifuged at 1.800 × g for 15 minutes. The precipitate was discarded and the plasma removed. To determine glucose, cholesterol and triglycerides levels we used the colorimetric enzymatic test (Kit Labtest, Bio Diagnostica) and absorbance was measured in spectrophotometer (CARY 3E-UV-Visible Spectrophotometer Varian).

Histopathologic analyses of pancreas and lung

For the histological analysis, the samples were fixed and embedded in paraffin. Using a microtome, the paraffin blocks were cut into 3-µm seriate sections. In the dehydration phase, the structures went through three containers with absolute alcohol and two containers with xylol. In the staining phase, the lungs and pancreatic tissue were immersed in hematoxylin-eosin. Lung section was also immersed in picrosirius red. Reading was performed with light microscopy (Nikon Labophot) at 100×. Histopathological alterations were assessed by two different pathologists in a blind fashion. The pancreatic islet area was measured with the ImageJ software (NIH, Bethesda, MD, USA). We selected 10 randomly areas at high-power field (100x) of each blind sample. The characteristics of lung damage include changes of alveolar wall, edematous, polymorphonuclear leukocytes (PMN) infilltration and expansion of the connective tissue in the alveolocapillary space. Inflammation and expansion of the connective tissue in the alveolocapillary space was scored (0, normal, 1, mild, 2, moderate, 3, severe) by a pathologist and overall lung injury was further calculated according to the sum of the score.

Statistical analysis

Data were expressed as mean±SD. Comparisons were performed by one way ANOVA with Bonferroni post hoc test using the software GraphPad Prism version 5.0 (GraphPad Software Inc., San Diego CA, EUA). Results with P<0.05 were considered statistically significant.

RESULTS

Clinical analyses

Clinical assessment revealed that diabetic animals (DG) lost weight (P<0.001) and had increased water ingestion (P<0.001) compared to CG (Figure 2B and 2C). Treatment with CSE showed no improvement in these clinical aspects (weight loss and polydipsia) when compared with DG (Figure 2B and 2C).

FIGURE 2
Evaluation of fasting plasma glucose (A), body weight (B) and water intake (C) in groups CG (control), DG (diabetic) and DTG (diabetic Cissampelos sympodialis treatment) during the experimental 4-weeks protocol. Data appear as mean ± SD ***p<0,001 in relation to CG versus DG.

Biochemical analyses

Four weeks after STZ-induced DM, there was a significant increase in fasting glycemia in the DG compared to the CG group (p<0.001) and treatment with CSE did not reduce this hyperglycemia (Table I). In relation to glycemic profile, the effect of treatment with CSE was similar to that of untreated rats (Figure 2A). Assessment of lipid profile showed that the CSE was capable of significantly reducing triglyceride and cholesterol concentrations (p<0.05), which were increased in DG (Table I).

TABLE I
Biochemical analyses from Glucose, cholesterol and triglycerides

	Experimental groups (n=10/group)
	CG	DG	DTG
Glucose, (mg/dL)	84±19,40	580±37,00 ***	567±32,10
Cholesterol, (mg/dL)	46±18,90	96±22,10 **	69±34,24 #
Triacylglycerols,(mg/dL)	35±17,30	218±62,60 ***	133±66,80 #

• Data presented as mean ± SD. CG, Control group, DG, diabetic group and DTG, diabetic Cissampelos sympodialis treatment group
• ^***
  P<0.001,
• ^**
  P<0.01 CG versus DG and
• ^#
  P<0,05 DG versus DTG.

Morphological analyses

The Figure 3 showed pancreatic architecture preserved in the CG, which had large pancreatic islets between the various serous acini (Figure 3A). STZ caused shrinkage of islets of Langerhans in DG (Figure 3B). The significantly higher number of active pancreatic islets in the DTG group indicated that Cissampelos Sympodialis possibly protects the pancreatic islets against death and/or assisted the regeneration of these partially destroyed pancreatic islets (Figure 3C). These data were confirmed through the morphometry of pancreatic islets using the ImageJ software. Morphometric analysis revealed that STZ apparently shrank pancreatic islets evidenced by the significant reduction in their area. However, treatment with CSE was able to prevent damage on islets morphology maintaining the value of the area similar to control group (Figure 4).

FIGURE 3
Histology of pancreatic tissues stained by hematoxylin and eosin (HE) from Control group (A), Diabetes Mellitus group (B) and diabetic Cissampelos sympodialis treatment group (C). Magnification 100 X.

FIGURE 4
Morphometric analysis of pancreatic islet in CG (control group), DG (diabetic group) and DTG (diabetic Cissampelos sympodialis treatment group). Data appear as mean ± SD ***P < 0.001 in relation to CG versus DG and ## P< 0,01 in relation to DG versus DTG.

The Figure 5 shows HE-stained lung tissue of experimental animals. In the CG, the entire lung architecture was preserved, exhibiting bronchioles with mucosa, submucosa and muscle layer, continuing with the spongy structure of the alveolar parenchyma, represented by numerous ducts and alveoli, whose walls or septa display a thin epithelial layer, supported by delicate connective tissue (Figure 5A). The lung morphology of the DG showed a loss of pulmonary architecture, due to the presence of the following histopathological findings: increase in alveolar septal thickness (Figure 5B), inflammatory exudate (Figure 5D), peribronchovascular inflammatory infiltrate (Figure 5E). Daily treatment with CSE showed an improvement in lung morphology when compared to DG animals, characterized by a reduction in inflammatory infiltrate (Figure 5C), and an absence in the other histopathological findings.

FIGURE 5
Histology of lung tissue stained by hematoxylin and eosin (HE). Control group (A), Diabetes Mellitus group (B, D, E) and Diabetic Cissampelos sympodialis treatment group (C). Magnification 100X (A, B, C, E) and 400 X (D).

The Figure 6 shows lung tissue stained in picrosirius red from the same animals. The diabetic animals exhibited increased thickening of both the alveolar (Figure 6E) and bronchovascular wall (Figure 6B), reflected in the increased deposit of connective tissue in these pulmonary areas when compared with control animals. Treatment with CSE apparently reduced the thickening of these tissue structures (Figure 6C and 6F).

FIGURE 6
Histology of lung tissue stained by picrusirius red. Control group (A, D), Diabetes Mellitus group (B, E) and Diabetic Cissampelos sympodialis treatment group (C, F). Magnification 100X (A, B, C) and 400 X (D, E, F).

The most frequent lung findings (inflammation and tissue fibrosis) in diabetic animals were assessed by score and it was observed that treatment with CSE reduced the intensity of these findings in DM (Figure 7).

FIGURE 7
The lung injury score (inflammation cells and tissue fibrosis) in different groups. Lung fragments were removed 24 hours after the last day of the experiment and stained with hematoxylin and eosin (HE), at 100x magnification. Data appear as mean ± SD. CG (control group), DG.

DISCUSSION

Type 1 DM results from selective destruction of the insulin-producing β-cells in the pancreatic islets (Teoh et al., 2010). Hence, search for new agents that protect β-cells from destruction and thereby prevent DM is needed. Moreover, studies have been carried out in search of therapies for the negative effects caused by DM, and natural products have been the target of this research. The present study demonstrated the role of CSE in reducing the lipid profile and protecting against morphological alterations in the pancreatic islets and in the lungs caused by STZ-induced DM.

Studies using experimental diabetes models in rodents have been widely used for mimicking clinical aspects of human DM (Lerco et al., 2003; Oliveira et al., 2013). In the present study, polyuria, polydipsia, ponderal loss, and hyperglycemia, were observed during the entire experiment in diabetic animals induced by STZ. Although daily CSE administration did not reduce these clinical characteristics and hyperglycemia, CSE was able to prevent the pulmonary injury and mitigate pancreatic islet damage seen in diabetic rats.

Dyslipidemia, a common complication in diabetic patients, it is also a serious risk for cardiovascular diseases (Yadav, Moorthy, Baquer, 2005; Werle 2009; Mcgill et al., 2000). The present study showed that increased concentrations of triglycerides and cholesterol declined after treatment with CSE. According to J Chen and Li (2007), extracts containing flavonoids exhibit hypolipemiant activity. Similar results were observed in studies by Werle (2009) and El-Bassossy et al. (2013). In addition, research conducted by Cavalcante et al. (2010) demonstrated that the alkaloids present in CSE exert hypotensor and vasorelaxing effects. Thus, the presence of flavonoids associated to alkaloids found in CSE may be responsible for reducing the lipid profile as seen in DTG.

Type 1 DM is believed to be initiated by autoimmune destruction of β-cell or islet, sources of insulin. T cells recognising β-cell specific antigens become activated infiltrate the inflamed islets and attack the β-cells (Gulle et al., 2014). In our study, histopathological examination and injury score of the islets of pancreas showed that CSE treated animals had a better morphological preservation of pancreatic islets compared to DTG. The better preservation of islets when the animals were treated with CSE can be directly related to the anti-inflammatory property of CSE. Previous phytochemical works have described the presence of five alkaloids in the hydro-alcoholic CSE: warifteine, metilwarifteine, roraimine, liriodenine and milonine (Cortes et al., 1995; De Lira et al., 2002) Warifteine (Wa) is the more abundant alkaloid in CSE, having its anti-inflammatory and immune modulatory properties mainly related to the modulation of the production and migration in vivo and in vitro of inflammatory cells such as neutrophils, eosinophils, macrophages and lymphocytes (Lima et al., 2014; Costa et al., 2008). Thus, it is possible that these substances are involved in modulating inflammation and exert protective effect on pancreatic islets cells.

Assessment of the morphological characteristics of lung tissue showed that diabetic animals exhibited different pulmonary structure when compared to healthy rats. Increase in bronchovascular wall thickening, presence of inflammatory infiltrate and pulmonary edema were some of the anatomopathological findings, corroborating other studies (Goldman, 2003; Eren et al., 2010; Spadella et al., 2010; Hagiwara et al., 2011). These investigations also demonstrated morphofunctional alterations in the lung tissue of diabetic rats. Treatment with CSE was effective in preventing the morphological alterations observed in animals treated with STZ.

Studies carried out by Plopper, Morishige (1978) showed increased synthesis and less degradation of collagen and elastin in the lungs of diabetic rats, evidenced by increased bronchovascular wall thickness. Similar morphological alterations were observed in diabetic lungs in our study, which were mitigated with CSE treatment.

Browlee (2001) reported that oxidative stress is related to possible signaling pathways associated with the chronic complications of DM, such as the polyphenol pathway, protein kinase C (PHC) activation and the pathway of advanced glycation end-products (AGEs). For this reason, a number of studies have demonstrated that the exogenous use of antioxidant substances reduces systemic damage caused in the physiopathology of DM, indicating their therapeutic potential for treating diabetic subjects (Dias et al., 2005; Bojunga et al., 2004). Ribeiro et al. (2008) showed that alkaloids exert intense antioxidant activity. Given that primary component in CSE is alkaloid (Barbosa-Filho, Agra, Thomas, 1997; Marinho, Barbosa-Filho, Oliveira, 2011), antioxidant activity may be one of the mechanisms responsible for the protective effect on lung morphology observed in the present study.

In this experimental model, acute therapy with CSE was capable to ameliorate lipid profile, the pancreatic islet damage and to preserve the pulmonary architecture of diabetic animals induced by STZ through a still unknown mechanism, but independent of glycemia. Therefore, these findings reveal the therapeutic potential of Cissampelos sympodialis on the pulmonary physiopathology of DM.

ACKNOWLEDGEMENTS

We thank Maria de Socorro M. Amarantes, Melyna S. Souto and Maria de Lourdes Freitas (Department of Morphology, CB, Federal University of Rio Grande do Norte) for expert assistance in histology. This work was supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq -14/2010) and Fundação de Amparo a Pesquisa do Estado do Rio Grande do Norte (FAPERN- PPP-3).

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Publication Dates

• Publication in this collection
  16 Mar 2020
• Date of issue
  2020

History

• Received
  14 July 2017
• Accepted
  10 Oct 2018