Effects of Bacillus licheniformis on the growth performance and expression of lipid metabolism-related genes in broiler chickens challenged with Clostridium perfringens-induced necrotic enteritis
- Mengjia Zhou†1, 2,
- Dong Zeng†1, 2,
- Xueqin Ni1, 2Email author,
- Teng Tu3,
- Zhongqiong Yin2,
- Kangcheng Pan1, 2 and
- Bo Jing1, 2
© Zhou et al. 2016
Received: 20 January 2016
Accepted: 2 March 2016
Published: 8 March 2016
Necrotic enteritis (NE), caused by Clostridium perfringens, has cost the poultry industry $2 billion in losses. This study aimed to investigate the effect of Bacillus licheniformis as dietary supplement on the growth, serum antioxidant status, and expression of lipid-metabolism genes of broiler chickens with C. perfringens-induced NE.
A total of 240 one-day-old broilers were randomly grouped into four: a negative control, an NE experimental model (PC), chickens fed a diet supplemented with 30 % of fishmeal from day 14 onwards and challenged with coccidiosis vaccine (FC), and NE group supplied with feed containing 1.0 × 106 CFU/g B. licheniformis (BL).
Body weight gain, feed conversion ratio, serum antioxidant status, and lipid-metabolism-gene expression were analyzed. In the PC group, FCR increased significantly whereas serum catalase and glutathione peroxidase activity decreased compared with NC group. Dietary B. licheniformis supplementation improved FCR and oxidative stress in experimental avian NE. Using Bacillus licheniformis as a direct-fed microbial (DFM) could also significantly upregulate catabolism-related genes, namely, peroxisome proliferator-activated receptor-α and carnitine palmitoyltransferase-1, in livers and changed the expression of lipid-anabolism genes.
These results suggested that dietary B. licheniformis supplementation can enhance growth and antioxidant ability, as well as change the expression of genes related to fatty-acid synthesis and oxidation in the livers of NE-infected broilers.
Necrotic enteritis (NE) is a type of enterotoxemia caused by Clostridium perfringens , it is a common disease affecting the poultry industry and the high contamination rates of poultry by C. perfringens can cause a threat to public health through the food chain . An NE outbreak in broiler chickens often results in high mortality rates and reduced growth performance [3, 4]. Various in-feed antibiotics have been used to prevent and control this disease [4–6]. However, the use of a large amount of antibiotics as growth promoters can cause antibiotic-resistant genes to spread extensively by promoting the selection of antibiotic-resistant bacteria in animals. In view of this concern, many countries have limited the use of non-therapeutic antibiotics in poultry feed; as a result, NE incidences have increased significantly over the past decade [7, 8]. This disease costs the poultry industry $2 billion annually in the purchase of drugs to treat NE and in the lost body weight gain (BWG) [9, 10]. With the banning of in-feed antibiotics use, alternative methods of preventing NE outbreaks must be developed.
A potential approach to NE control is to supplement probiotics in the diets of broiler chickens to manipulate their gut ecosystems. Over the past few decades, Bacillus spp., such as B. licheniformis and B. subtilis, have been used in competitive exclusion experiments. B. subtilis competitively exclude C. perfringens from broiler chicks; in addition, these bacteria significantly improved body weight and feed efficiency [11–15]. B. licheniformis, which are “generally recognized as safe” bacteria, have long been extensively used in the poultry industry. This bacteria can serve as an alternative to antibiotics to enhance growth performance in poultry  and is a useful prebiotic for overcoming NE in a commercial-like condition [17, 18].
In broilers, the intermediary metabolism of lipids and energy usually occurs in the liver , as does the majority of the de novo fatty acid synthesis process [20, 21]. In the modern poultry industry, chickens are subject to various stress factors that can thus influence lipid metabolism [22–24]. Studies show that the livers of broilers suffering from NE undergo pathological changes [4, 25, 26]; nonetheless, changes in the lipids of broilers infected with C. perfringens are rarely investigated. At present, few studies have demonstrated the efficacy of B. licheniformis as prophylactic agents against NE in broilers. Therefore, the objectives of our present study are to investigate the effect of B. licheniformis on growth performance, on lipid metabolism, and on the hepatic expression of lipogenic genes in broilers infected with NE.
Effect of Bacillus licheniformis on the growth performance of broilers suffering from necrotic enteritis
The effect of Bacillus licheniformis on the growth performance suffering from necrotic enteritis*
Days 1 to 14
Days 14 to 28
Days 1 to 28
Effect of Bacillus licheniformis on the serum biochemical parameters of broilers infected with necrotic enteritis
Effect of Bacillus licheniformis on the serum antioxidant statuses of broilers suffering necrotic enteritis
Serum catalase (CAT) activity was significantly lower in the PC group that suffered from NE and was not supplemented with B. licheniformis than in the NC group (P < 0.05). The CAT activity of the chickens in the BL group displayed an increasing trend (P > 0.05) but did not differ from the NC and PC groups (P > 0.05).
NE infection considerably reduced the enzyme activity of glutathione peroxidase (GSH-Px) in both the PC and BL groups in comparison with the NC group (P < 0.05). The NC and FC groups did not vary significantly (P > 0.05).
Effect of Bacillus licheniformis on the expression of lipid-metabolism genes in the livers of broilers
As shown in Fig. 3, the mRNA level of acetyl-CoA carboxylase (ACC) in the livers of birds in the BL group, who were dosed with 1.0 × 106 CFU/g B. licheniformis, was higher than those of the other three groups (P < 0.05). In addition, B. licheniformis did not significantly affect the expression of the fatty acid synthase (FAS) gene in the liver although the BL group displayed the highest expression (P > 0.05) of all of the groups. In addition, sterol regulatory element-binding protein-1c (SREBP-1c) expression was considerably lower in the BL group than in the NC and PC groups (P < 0.05).
B. licheniformis supplementation can upregulate the expression levels of genes related to fatty acid oxidation. This bacteria significantly increased the mRNA level of carnitine palmitoyltransferase-1 (CPT-1) and enhanced the expression of peroxisome proliferator-activated receptor-α (PPAR-α) in the BL group compared with the PC group (P < 0.05). Acyl CoA oxidase 1 (ACOX1) expression did not differ significantly across all groups (P > 0.05); nonetheless, that of the BL group was higher than that of the PC group.
In the present study, the growth performance of broilers infected with C. perfringens was significantly poorer in the PC group than in the other groups. The reduced BWG and impaired FCR can be indicated by the damaged intestinal mucosa that accompanies C. perfringens infection [27, 28], and this damage can affect feed absorption and thus utilization .
Bacillus sp. microbes are among the most extensively used, direct-fed growth promoters . These bacteria serve as an alternative to antibiotics. In the current experiment, a diet supplemented with B. licheniformis can significantly improve BWG and FCR despite C. perfringens infection. These effects are mainly attributed to the fact that B. licheniformis can enhance nutrient digestion and utilization in broilers by producing several enzymes, such as lipase, protease, and amylase [29, 30]. The diets supplemented with Bacillus sp. as a growth promoter can improve BWG and feed efficiency [15, 24, 31, 32]. Nonetheless, the effects of B. licheniformis on positive responses to growth performance, such as changes in gut flora, immunity responses, and direct substrate digestion, remain unclear.
The level of fatty acid circulation between the liver and adipose tissue is related to the containment of serum lipids and lipoproteins . Several studies observed that probiotics can significantly reduce these levels in broilers [34, 35]. These results may be attributed to the ability of probiotics to bind cholesterol in guts; probiotics can remove cholesterol through binding onto cellular surfaces  and also can convert cholesterol to coprostanol for direct excretion via feces [37, 38]. Increased fecal-lipid and bile-acid output can reduce accumulate serum levels and liver lipids in the body .
The present data demonstrate that the birds infected with NE exhibited the highest level of GLU, TC, and LDL-C among those in all of the groups. NE-infected birds that were co-treated with B. licheniformis in this study had low concentrations of TC, GLU, and LDL-C but high levels of HDL-C. This result agrees with the finding presented by Yeon et al., who suggested that B. licheniformis can improve lipid metabolism in mice who were fed a high-fat diet .
Researchers hypothesize that oxidative stress influences growth performance and lipid metabolism in animals [15, 24, 41, 42]. In the present study, SOD, CAT, and GSH-Px serum activities were assayed as indices for serum antioxidant capacity, whereas MDA content served as an indicator to determine serum lipid peroxidation levels. MDA is among the most studied products of polyunsaturated fatty acid peroxidation, and its lipid peroxidation is facilitated by reactive oxygen species (ROS). The BL group in the current study displayed a low MDA level, thus indicating that B. licheniformis treatment can reduce oxidative stress. The inhibition of SOD, GSH-Px, and CAT activities contributes to the onset of many diseases . In the present study, NE infection lowered CAT and GSH-Px serum activities. This result is similar to that of the research conducted by Lee et al., which postulated that SOD, GSH-Px, and CAT activities were inhibited in birds infected with NE . In a previous study, dietary B. licheniformis supplementation significantly enhanced the antioxidant capability of triangular breams . In this research, BL group improved the antioxidant capacities in the serum of broilers by increasing GSH-Px and CAT activities and by decreasing MDA compared with the PC group. This result showed that dietary B. licheniformis supplementation is an effective strategy to reduce the oxidative stress of experimental avian NE.
The liver is an important organ in which the majority of lipid metabolism occurs. Thus, the gene expression in livers, which can change the capacity of enzymes in relevant metabolic pathways, plays an important role in altering digestive capability . ACC, which is the first key enzyme in fatty acid synthesis and converts acetyl-CoA into malonyl-CoA, plays an important role in the regulation of fatty acid synthesis in animal tissues. This enzyme often combines with FAS as rate-limiting lipogenesis enzyme . In the current study, both ACC and FAS levels increased in three of the groups, especially in the BL group, unlike in the NC group. This phenomenon may be ascribed to the diet change made to build the NE model. Huang et al. determined that diets supplemented with 0.5–2 % soy lecithin can significantly increase the expression of FAS and ACC and change the biochemical status of serum lipids . Zhao et al. reported that C. butyricum supplementation is related to increased FAS and ME activities, enhanced FAS, ME, and ACC mRNA levels in the liver, and increased intramuscular fat content in broilers . In the current research, B. licheniformis supplementation can generate the same effect, possibly because B. licheniformis can enhance the digestion and utilization of nutrients from a diet containing a high percentage of fishmeal. This diet was used in the NE experimental model and was difficult for broilers to digest. SREBP-1c is a basic/helix-loop-helix/leucine zipper transcription factor that contributes to lipogenic enzyme expression . This transcription factor can bind to the promoters of several lipogenic enzyme genes and induce their expression . Researchers also report that SREBP-1c is a lipogenic nuclear transcriptional regulator that can directly influence the expressions of ACC, FAS, ME, and SCD . In our present study, however, SREBP-1c gene expression decreased significantly in contrast to the expression of lipogenic enzyme genes. This result may be attributed to the fact that fat composition is increasingly exuberant in the subsequent growth stage of broilers , especially as the diet changes and probiotics supplementation increases nutrient digestion and utilization in these chickens.
Different diets can alter the expression of PPARs in broiler livers . PPAR-α plays an important role in lipid metabolism; an increase in the expression of this isoform can upregulate the expression of fatty acid catabolism-related genes (CPT-1, ACOX1) and enhance fatty acid β-oxidation [54, 55]. In the present study, B. licheniformis can increase both PPAR-α and CPT-1 expression. The expression of these genes was lowest in the NE-infected birds.
In summary, the present study shows that NE infection can change the expression of genes related to fatty acid synthesis and oxidation. B. licheniformis supplementation can adjust the levels of these genes by enhancing the expression of fatty acid β-oxidation-related genes to alleviate the negative effects of such infection.
Preparation of culture strains
B. licheniformis H2 (CCTCC NO:M2011133) isolated from the ileums of healthy chickens was provided by the Animal Microecological Research Center (College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China) and cultured at 37 °C at a shaking rate of 180 rpm for 24 h. The culture was centrifuged at 2000 g for 20 min at 4 °C and then resuspended in LB broth containing 1 × 109 colony-forming units (cfu)/mL. The culture was mixed with a basal diet at a level of 1 g/kg (0.1 %, m/m) per day to ensure the viability of bacteria cells throughout the trial period.
A C. perfringens type-A strain isolated from a chicken clinically diagnosed with NE was obtained from China Veterinary Culture Collection Center. The strain was cultured in a cooked meat medium at 37 °C under an anaerobic environment; then, the strain was aseptically inoculated into thioglycollate broth overnight at the same temperature and in the same condition.
Birds and housing
Composition of the diet and nutrient levels
Corn-soybean meal diet
High fishmeal diet
Soybean (44.2 % crude protein)
Fish meal(62.8 % crude protein)
Metabolisable energy (MJ/kg)
Necrotic enteritis infection
The birds were fed with a basal diet from days 1 to 13. From day 14 onward, the diets of all of the birds were changed to the basal diets supplemented with 30 % fishmeal (w/w), except for that of the chickens in the NC group. On day 15, all of the birds, with the exception of those in the NC group, were inoculated with 10-fold coccidiosis vaccine by oral gavage. The birds in the NC group received sterile phosphate buffered saline instead. On days 18, 19, and 20, the birds in the PC and BL groups were individually infected with 1 mL of C. perfringens through a plastic tube containing approximately 2.2 × 108 CFU/mL of this bacteria. The feed of the BL group was dosed with 1.0 × 106 CFU/g B. licheniformis throughout the experiment, and samples were collected on day 28.
On day 28, 2 birds per pen (10 birds/treatment) were randomly selected and terminated. The blood for the serum samples was sampled and incubated at 37 °C for 2 h and then centrifuged at 2000 g for 15 min. The broilers were then killed by cervical dislocation and necropsied. The liver samples were washed with ice-cold sterilized saline and frozen in liquid nitrogen immediately. The samples were then stored at −70 °C to determine lipid metabolism mRNA.
The FI and BWG of the chickens in all pens were measured weekly. Moreover, FCR was calculated and adjusted for the dead broilers.
Determination of serum biochemical values
The serums TC, GLU, TG, HDL-C, and LDL-C were measured on day 28 with a GS200 automatic biochemical analyzer (Shenzhen Genius Electronics Co., Ltd., Shenzhen, China) according to the manufacturer’s instructions.
Determination of serum antioxidative status
Activity of SOD, GSH-Px, and CAT activity, as well as the MDA content in serum, were assayed with commercially available assay kits (Nanjing Jiancheng Bioengineering Institute) in accordance with the manufacturer’s instructions as indices for serum antioxidant capacities. In brief, the colorimetric method was used to measure CAT activity; SOD activity was calculated based on an auto-oxidant using the hydroxylamine method; GSH-Px activity was assayed according to a 5, 5’-dithiobis (2-nitrobenzoic acid) method; and MDA content was assayed via a thiobarbituric acid method and absorbance measurement at 532 nm.
Real-time quantitative polymerase chain reaction (RT-qPCR) analysis of gene expression
The total RNA was extracted from liver samples with RNAiso Plus (TaKaRa, Dalian, China) according to the manufacturer’s instructions. RNA quality was tested on 1.5 % agarose gel by electrophoresis, and the quantity of RNA was determined by measuring the absorbance at 260 and 280 nm by using a spectrophotometer (Nanodrop 2000, Thermo Scientific, USA). A first-stand complementary DNA (cDNA) was reversed immediately with 1 μg of total RNA using a Prime Script TM RT reagent kit (TaKaRa, Dalian, China) according to the manufacturer’s instructions. All cDNA were stored at −70 °C for further use.
Primers used for real-time PCRa
Primers sequnce (5' to 3')
Data were expressed as the mean ± standard error of the mean (SEM). All of these data were analyzed with SPSS Version 20.0 for Windows (SPSS Inc., Chicago, Illinois, USA). A homogeneity test of variance was performed and the results analyzed with one-way analysis of variance. Specific treatments were compared via the least significant difference test at an assigned p-value of < 0.05. Differences between the means were considered significant when P < 0.05.
The results of our present study showed that dietary B. licheniformis supplementation effectively alleviates the negative effects of NE infection. This supplement can also reduce antioxidant stress, enhance growth performance, and adjust the expression levels of certain key genes related to lipid metabolism. Furthermore, the study data may provide a new insight into the prevention and treatment of NE in broilers.
This study was supported by the International Cooperative Project of Science and Technology Bureau of Sichuan Province (2013HH0055) and the Science and Technology Support Project of Science and Technology Bureau of Sichuan Province (2013NZ0042).
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