In Vivo Effects on the Intestinal Microflora of Physalis Alkekengi Var
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Fitoterapia 87 (2013) 43–48 Contents lists available at SciVerse ScienceDirect Fitoterapia journal homepage: www.elsevier.com/locate/fitote In vivo effects on the intestinal microflora of Physalis alkekengi var. francheti extracts Xinli Li, Cuili Zhang, Weiling Li, Dachang Wu, Jianjun Liu, Li Tang, Yi Xin ⁎ Department of Biotechnology, Dalian Medical University, Dalian China article info abstract Article history: This study aimed to investigate the effects on the intestinal microflora balance of Physalis Received 6 December 2012 alkekengi var. francheti extracts (PE) using in vivo mouse model. Luteolin-7-O-β-glycoside, Accepted in revised form 15 March 2013 Physalin J, Physalin D, and Physalin P were isolated from PE extracts and identified. Bacteroides, Available online 2 April 2013 Lactobacillus, Helicobacter, Prevotella, Odoribacter and Oribacterium were detected as dominant organisms in the intestinal tract of mice by denaturing gradient gel electrophoresis (DGGE) Keywords: analysis. The quality and quantity of Lactobacillus genus increased significantly with increasing Physalis alkekengi var. francheti concentration of PE. This study shows that the intestinal microflora balance could be improved Isolation by PE, and thus, it has the significant potential to be used as a natural agent for restoring the Intestinal microflora balance intestinal microflora balance. DGGE Crown Copyright © 2013 Published by Elsevier B.V. All rights reserved. 1. Introduction analysis to give insights into the microbial similarity and diversity of the sites, while UPGMA dendrogram construc- Physalis alkekengi var. francheti of the family of Solanaceae tion [8,9] and sequencing [10] were done to test for DGGE is a well-known edible and medicinal plant in the northeast- motifs and taxa. The results clearly indicated that the intestinal ern part of China. Its fruit calyx has been used in traditional microflora balance was improved, and therefore, P. alkekengi Chinese medicine as a therapeutic agent to remove heat, detoxify var. francheti has a significant potential to be used as a natural the body and relieve sore-throat [1].Ithasgreatmedicinal agent for improving the intestinal microflora balance. potential, and a stable form of P. alkekengi var. francheti product could be developed to fulfill the health food market. Studies on P. alkekengi var. francheti have attracted more attention in recent 2. Materials and methods years due to its potential biological functions. In addition its active components, such as physalins, polysaccharides and 2.1. Materials and chemicals flavones have been widely studied [2–6]. However, to the best of our knowledge, no studies on effects P. alkekengi var. francheti was purchased from Dalian of P. alkekengi var. francheti on the intestinal microflora balance Traditional Chinese Medicine Market, China in October 2011 and have been carried out. We therefore specifically evaluated the identified according to the identification standard of the People's effects of PE on intestinal bacterium in vitro and in vivo.PEwas Republic of China's Pharmacopeia. A voucher specimen (No. extracted with EtOH, refined by macroporous resin and analyzed LP201102) is deposited in the Department of Biotechnology, by HPLC. It showed stimulative effect on the growth of probiotics Dalian Medical University, China. AB-8 macroporous adsorptive but inhibitory effect on the pathogenic bacterium [7].Denaturing resin was purchased from the chemical plant of Nankai Uni- gradient gel electrophoresis (DGGE) was combined with image versity, China. E.Z.N.A® Stool DNA Kit was purchased from Omega (Bio-tek, USA). ExTaq polymerase was purchased from TaKaRaBiotechnologyCo.,Ltd.(Dalian,China).Polymerase ⁎ Corresponding author. Tel./fax: +86 411 86110296. Chain Reaction primers GC-357f, 518r and 357f (Table 1)were E-mail address: [email protected] (Y. Xin). synthesized by TaKaRa Biotechnology Co., Ltd. LiZhu ChangLe 0367-326X/$ – see front matter. Crown Copyright © 2013 Published by Elsevier B.V. All rights reserved. http://dx.doi.org/10.1016/j.fitote.2013.03.018 44 X. Li et al. / Fitoterapia 87 (2013) 43–48 capsule (Approval Number: S10960040) and levofloxacin standardized conditions at a temperature of 22–24 °C, and capsule (Approval Number: H20066206) were purchased 20% humidity with a 12 h light/dark cycle, and they had free from Dalian Pharmacy of China. All other chemical reagents access to standard diet and water ad libitum. They were used were analytical grade. allowed to acclimatize for five days before the experiments were started. 2.2. Extraction and isolation 2.4.2. Antibiotic-induced intestinal microflora imbalance model The air dried P alkekengi var. francheti (3 kg) were extracted in mice two times in refluxing EtOH (70%) for 2 h at 60 °C. The solvent Intestinal microflora imbalance was induced by intragastric was evaporated to dryness, and the dry residue (1.5 kg) was (i.g.) administration with levofloxacin at the dose of 65 mg/kg subjected to AB-8 macroporous adsorptive resin (12 kg), eluted dissolved in water [11]. with water (14 L), 50% EtOH (22 L), and 95% EtOH (15 L) successively to yieldthreefractions(H2O fr., 50% fr. and 95% fr.). 2.4.3. Experimental design 50% fr. was collected and dried to form PE (yield, 165.0 g). Eighty mice were randomly divided into eight groups PE was further fractionated by column chromatography on (ten mice in each group). silica gel eluting with CH2Cl2/MeOH (10:1 → 1:1, v/v) to give seven fractions (SG fr. 1– 7). SG fr. 2 (20.3 g) was recrystallized Group 1 Normal control (NC), normal mice treated with water. from MeOH to give 4 (0.32 g). SG fr. 7 (48.0 g) was recrystallized Group 2 Levofloxacin control (LC), normal mice treated with from MeOH to give 1 (2.02g).SGfr.4(33.8g)wasseparatedby levofloxacin. column chromatography on silica gel eluting with CH2Cl2/MeOH Group 3 PE-L, levofloxacin-treated mice with 80 mg/kg of PE. (8:1 → 1:1, v/v) to give four fractions (SG fr. 4.1–SG fr. 4.4). SG Group 4 PE-M, levofloxacin-treated mice with 160 mg/kg of fr.4.3wasfurtherseparatedbyHPLConareverse-phasecolumn PE. (10 × 250 mm with a particle size of 5 μm, Tokyo, Japan) using Group 5 PE-H, levofloxacin-treated mice with 330 mg/kg of MeOH/H2O (4:6) to give 2 (0.51 g) and 3 (0.88 g). PE. Group 6 LZ-L, levofloxacin-treated mice with 50 mg/kg of 2.3. High performance liquid chromatography (HPLC) analysis LiZhu ChangLe capsule. Group 7 LZ-M, levofloxacin-treated mice with 100 mg/kg of The sample PE (18 mg) was dissolved in distilled water LiZhu ChangLe capsule. (2 ml) and filtered with a 0.22 μm filter. Then the flow-through Group 8 LZ-H, levofloxacin-treated mice with 200 mg/kg of solution was analyzed by HPLC system (LC-2010A, Shimadzu, LiZhu ChangLe capsule. Japan) with a reversed-phase Waters Symmetry® C18 column (4.6 × 150 mm with a particle size of 5 μm). The mobile phase Every drug (or water for NC) was administered by i.g. once consisted of solvent A (acetonitrile) and solvent B (0.05% a day. The consumption of diet and water, and body weight phosphoric acid) with gradient program of 0–15 min, 5–8% A; were recorded daily. After 7 consecutive days of treatment, 15–25 min, 8–18% A; and 25–60 min, 18–35% A. The flow rate fecal were collected and preserved at −80 °C. was maintained at 1.0 ml/min and the injection volume was 10 μl. Ultraviolet detection was carried out at 230 nm. The 2.4.4. Deoxyribonucleic acid (DNA) extraction column temperature was kept at 35 °C. DNA was extracted from fecal samples with E.Z.N.A® Stool Compounds 1 (3.3 mg), 2 (3.08 mg), 3 (4.02 mg), and 4 DNA Kit in accordance with the manufacturer's instructions. (4.0 mg) were dissolved in distilled water (1 ml for each), and The amount and quality of DNA extracts were analyzed by filtered with a 0.22 μm filter. They were analyzed through the electrophoresis of 1% agarose gel containing ethidium bromide, same HPLC conditions as outlined above. andcomparedtoamolecularweightstandard(1kb).TheDNA concentration was measured spectrophotometrically using 2.4. In vivo effects on the intestinal microflora Biophotometer plus (NanoVue, USA) and DAN extracts were preserved at −20 °C until used. 2.4.1. Animals Female BALB/c mice weighing 20 ± 2 g, purchased from 2.4.5. Polymerase chain reaction (PCR) amplification Animal Experimental Center of Dalian Medical University Primers GC-357f and 518r were used to amplify the V3 [Certificate of quality number: SCXK (Liao) 2008-0002] were region of bacterial 16S rRNA. PCR amplification was performed used for all animal experiments. The mice were kept under with an automated thermocycler (Thermo, USA) as follows: 3 μl purified genomic DNA as template (300 ng approximately), 10 × ExTaq buffer (Mg2+ plus) 2.5 μl, dNTP mixture 4 μl, BSA Table 1 (1 mg/ml) 2.5 μl, 10 pmol of each primer, 1.25 U of ExTaq Nucleotide sequences of primers to be used in this study. polymerase, and filled up to a volume of 25 μl with sterile Primer Sequence 5′–3′ Milli-Q water. The thermal program consisted of an initial denaturation step of 94 °C for 5 min, followed by 30 cycles of GC-357fa CGCCCGGGGCGCGCCCCGGGCGGGGCGGGGG ACGGGGGGCCTACGGGAGGCAGCAG 94 °C, 54 °C, and 72 °C for 30 s each, in which the annealing 518rb ATTACCGCGGCTGCTGG temperature was 72 °C for 7 min [12].Amplificationproducts 357fa CCTACGGGAGGCAGCAG were analyzed first by electrophoresis of 1% agarose gel a Forward. containing ethidium bromide, and compared to a molecular b Reverse. weight standard (100 bp). X. Li et al. / Fitoterapia 87 (2013) 43–48 45 2.4.6.