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C. perfringens challenge reduces matrix metalloproteinase activity in the jejunal mucosa of Eimeria-infected broiler chickens


Matrix metalloproteinases (MMPs) play an important role in intestinal extracellular matrix homeostasis. An overexpression of MMPs results in tissue destruction and local inflammation and has been associated with multiple inflammatory diseases. These host proteases might also be important in tissue damage caused by infectious agents, such as in intestinal damage in Clostridium perfringens-induced avian necrotic enteritis (NE). The aim of the present study was to elucidate the effect of a C. perfringens infection on the MMP activity in the small intestine of birds with a pre-disposing coccidial infection to obtain a more thorough understanding of the pathogenesis of NE. For this purpose, the gelatinolytic activity present in jejunal tissue of Eimeria infected birds which were challenged with either a pathogenic C. perfringens type G strain or a commensal C. perfringens type A strain was analyzed using substrate zymography. The results show that infection of broilers with Eimeria and different C. perfringens strains, independent of their pathogenicity, decreases the expression of a 40–45 kDa host collagenase in the jejunum, as compared to the expression in Eimeria-infected control birds. It was also shown that the expression of 2 MMPs with molecular weights of approximately 50–60 and 60–70 kDa was significantly lower in necrotic tissue as compared to the activity in macroscopically healthy tissue adjacent to the lesion. These results indicate that host collagenases are not elicited by the C. perfringens infection for permeabilizing the host mucosa to allow penetration of the NetB toxin in Eimeria infected broilers.


Necrotic Enteritis (NE) is one of the most common and financially devastating bacterial diseases in the modern poultry industry [1, 2]. The disease is caused by netB-positive C. perfringens strains and is characterized by severe necrosis and inflammation of the small intestine [3,4,5]. The pore-forming toxin NetB is an essential virulence factor in the development of necrotic ulcers which are typical for NE in broilers [4]. Where and how NetB initiates damage is hitherto not determined. It is currently believed that NetB is not involved in early disease pathogenesis and targets deeper layers of the intestinal mucosa rather than superficial structures [6]. Therefore, initial breakdown or permeabilization of the mucosal layer might be required in order for NetB to exert its action. This permeabilization can be either a direct effect on the host tissues of C. perfringens virulence factors other than NetB, or it can be a host response elicited indirectly by C. perfringens.

Overexpression of host collagenases has been associated with intestinal tissue destruction in several gastro-intestinal inflammatory diseases in humans, including Crohn’s disease, ulcerative colitis and several forms of gastro-intestinal cancer [7,8,9,10,11]. These host collagenases might also be important in tissue damage caused by infectious agents, such as in intestinal damage in NE. Indeed, collagen is widely distributed throughout the gastrointestinal tract and is an integral component of the connective tissue and basement membrane of the intestinal mucosal layer [12,13,14]. Disruption of this structural protein may result in loss of tissue integrity and allow penetration of bacterial toxins to deeper tissues and so contribute to subsequent tissue necrosis [15]. Furthermore, Olkowski and colleagues showed an increased MMP activity in necrotic tissue of broilers which were challenged with NE-producing C. perfringens strains as compared to tissue of non-challenged birds [16].

NE is a multifactorial disease and outbreaks of NE are almost exclusively found to co-occur or follow upon a predisposing coccidial infection [17,18,19,20,21]. During coccidiosis, Eimeria spp. colonize the intestine and destroy epithelial cells as a consequence of the intracellular stages of their lifecycle [20]. Eimeria induces leakage of serum proteins in the lumen of the gut and increases mucus secretion. Both mucus and serum proteins are rich sources of nutrients which C. perfringens can exploit for proliferation and toxin production [22, 23]. In addition to providing nutrients for C. perfringens, a predisposing Eimeria infection also has tremendous effects on the intestinal tissue itself by shortening of the villi [24], inducing inflammation [25], reducing the activity of digestive enzymes and disrupting tissue integrity [20]. In order to fully characterize the events that contribute to disease pathogenesis, even under experimental settings, this predisposing coccidial infection should be taken into account.

Therefore, the aim of the present study was to focus on the host response to C. perfringens, trying to elucidate the effect of a C. perfringens infection on the host MMP activity in the small intestine of birds in the presence of a coccidial infection, known to be a crucial predisposing factor for NE.

Materials and methods

Bacterial strains and culture conditions

Two different C. perfringens strains were used. Strain 56 was originally isolated from the gut of a NE-affected broiler and is characterized as a toxinotype G strain. The strain is able to express NetB toxin and is routinely used to induce NE in an in vivo infection model in broilers [26]. Strain JIR4857 is characterized as a commensal toxinotype A strain and cannot express NetB toxin. The inoculum for the oral infection of chickens was prepared by culturing both strains anaerobically overnight at 37 °C in brain heart infusion broth (Oxoid, Basingstoke, UK).

Necrotic enteritis trial

The in vivo NE model used in this trial was based on a previously described study [27]. In short, 1-day-old unvaccinated Ross 308 broilers were randomly allocated to 3 different treatment groups with 27 birds/pen (4 replicate pens challenged with strain CP56, 1 pen challenged with the commensal C. perfringens strain JIR4857 and 1 pen with control birds, which were not challenged with C. perfringens). All broilers were fed a wheat/rye-based (43%/7.5%) diet supplemented with soybean meal as a protein source. From day 17 on, the diet was altered with fishmeal (30%) replacing the soy bean meal as a protein source. These diets contain high levels of proteins and non-starch polysaccharides which predispose chicken to the development of NE. Mild immunosuppression was induced by administering the commercial Nobilis Gumboro D78 vaccine, containing attenuated infectious bursal disease virus, on days 4 and 9 (MSD Animal Health). On days 14 and 16, all animals received a tenfold dose of live attenuated Eimeria vaccines, respectively Hipracox (containing 5 Eimeria species: E. tenella, E. acervulina, E. maxima, E. praecox and E. mitis) (Hipra, Melle, Belgium) and Paracox-8 (containing 7 Eimeria species: E. acervulina, E.brunetti, E. maxima, E. mitis, E. necatrix, E. praecox and E. tenella) (MSD Animal Health, Brussels, Belgium), to induce a predisposing coccidial infection. On days 18, 19 and 20, birds in the first group were challenged with approximately 5 × 108 CFU of netB-positive C. perfringens strain 56. Birds in the second and third group received the same predisposing factors as the first group but were inoculated on day 18, 19 and 20 with respectively 5 × 108 CFU of netB-negative C. perfringens strain JIR4857 or sterile bacterial growth medium. On day 21, all animals were euthanized.

At necropsy, NE severity was evaluated by scoring lesions in the small intestine (duodenum, jejunum, ileum) as previously described by Keyburn et al. [28] as follows: score 0 = no lesions, score 2 = focal necrosis or ulcerations (1–5 foci), score 3 = focal necrosis or ulcerations (6–15 foci), score 4 = focal necrosis or ulcerations (≥ 16 foci), score 5 = patches of necrosis of 2–3 cm long, score 6 = diffuse necrosis. Birds with a lesion score of 2 or more were considered NE positive. From each scoring class, jejunal lesion tissue (except for scoring class 0) and macroscopically unaffected tissue, 1 cm adjacent to the lesion of 5 different animals was collected. The samples that were collected from NE-affected birds were derived from 2 different pens (5 samples were collected from pen 1, 4 samples were collected from pen 2). The samples were stored at − 20 °C.

Protein extraction

Proteins were extracted from the intestinal tissue using mechanical lysis. Briefly, ± 27 mg of intestinal tissue was mixed with 400 µL TBS-1% NP-40 [50 mM Tris/HCl, pH 8.0, 150 mM NaCl and 1% (v/v) NP-40 supplemented with EDTA-free protease inhibitor cocktail (Complete, Roche, Mannheim, Germany)]. The mixture was homogenized by grinding with 2.3 mm zircon/silica and 3.2 mm stainless steel beads (BioSpec Products, Bartlesville, OK, USA) in a bead beater (twice for 1.5 min, 22.5 Hz; TissueLyser) with a 30 s interval between shakings. Subsequently, samples were centrifuged for 10 min at 8000 × g and the supernatant was transferred to a new tube. Protein concentration was measured using the BCA protein assay (Thermo Fisher Scientific, Merelbeke, Belgium) and samples were stored at − 20 °C until further analysis.


The gelatinolytic activity in the intestinal tissue lysates collected from the NE trial was analyzed using gelatin zymography. Briefly, aliquots containing 60 µg of protein of each sample were mixed with 2× loading buffer (0.5 M Tris–HCl pH 6.8, 20% glycerol, 4% SDS, a pinch of bromophenol blue) and separated on 8% SDS page containing 0.1% gelatin under non-denaturing conditions. After separation, the gel was incubated with renaturing buffer (2.5% Triton X-100, 30 min, room temperature) to remove SDS from the gel. This allows the separated enzymes in the gel to renature and auto-activate. Subsequently, the gel was washed with developing buffer (150 mM NaCl, 5 mM CaCl2, 0.05% NaN3 and 50 mM Tris–HCl buffer pH 7.5) and incubated with fresh developing buffer under continuous shaking at 37 °C for 18 h. Afterwards, the gel was stained for 1 h with Coomassie Brilliant Blue (Sigma-Aldrich, Overijse, Belgium) and destained for 20 min with destaining solution [40% methanol (v/v), 10% acetic acid (v/v)]. Activity of gelatin-degrading enzymes is visible as clear colorless bands against a blue background. Gels were scanned using a GS-800 calibrated densitometer and the approximate molecular weight of the present bands and their intensities were determined using the Quantity One software (BioRad, Hercules, CA, USA). The gelatinolytic activity of each band was calculated as \(\frac{100}{{OD/{\text{mm}}^{2} }}\) and is described in arbitrary units (AU). Six different gelatinolytic bands were observed in the jejunal tissue. The lowest and highest bands were not quantified due to distortion and oversaturation of the bands.

Statistical analysis

Differences in the occurrence of NE lesions between the different segments of the small intestine of C. perfringens type G challenged broilers were evaluated by a binary logistic regression analysis using R statistical software. All other analyses and calculations were performed using GraphPad Prism software (version 5.03, San Diego, CA, USA). A paired Student’s t test was used to compare gelatinase activity in necrotic and macroscopically healthy tissue derived from the same bird. For all other data, two-group experiments were analyzed with unpaired Student’s t test, whereas one-way ANOVA followed by Tukey’s test was used for comparison of more than two groups. Results are presented as mean ± SEM. Analyses were performed with 95% confidence intervals and significance was determined as p ≤ 0.05.


Lesions of necrotic enteritis are more prevalent and severe in the jejunum

Broilers of the control group which were not challenged with C. perfringens but received all predisposing factors including Eimeria infection did not develop NE (n = 26). Additionally, no necrotic lesions were seen in the intestine of birds challenged with a commensal C. perfringens type A strain JIR4857 (n = 27). Only C. perfringens type G strain CP56 was able to induce necrotic lesions in Eimeria infected birds. Lesions were observed in 85.05% (91/107) of the birds challenged with this netB–positive C. perfringens strain. In NE positive chickens the lesions could be observed in all segments of the small intestine, but were most severe in the jejunum as compared to the duodenum or ileum (p < 0.0001). A significant association was observed between the small intestinal segment and the development of necrotic lesions, with the jejunum being 17.89 to 22.9 times more likely to develop necrotic lesions as compared to the duodenum or ileum, respectively. Moderate enteric lesions (score 3 and 4) were dominant, being present in 68.13% (62/91) of the affected birds. Lesion score distributions for each segment of the small intestine are summarized in Table 1.

Table 1 Score distribution of necrotic enteritis lesions in the small intestine of 21-day old broilers

Clostridium perfringens challenge decreases the activity of a specific host collagenase

As the NE lesions occurred most frequently in the jejunum of broilers, we focused on this section of the small intestine to study the effect of C. perfringens challenge on host MMP activity in Eimeria infected birds. The gelatinolytic activity present in jejunal tissue from broilers in the different treatment groups of the NE trial was assessed by gelatin zymography.

As NE is a complex disease, not all animals are equally affected by NE in experimental trials and field outbreaks. In the current trial, a minority of the birds challenged with the pathogenic, C. perfringens type G strain did not develop macroscopic lesions of NE. When focusing on these birds that did not develop NE (i.e. birds without macroscopic intestinal necrosis), significantly lower gelatinase activity of a 40–45 kDa protein was measured in the jejunal tissue of birds challenged with a C. perfringens type A or type G strain as compared to control chickens receiving only the predisposing Eimeria infection (p-value respectively 0.0317 and 0.0098, Table 2). No difference in gelatin-degrading activity of this 40–45 kDa protein was observed between birds challenged with either the C. perfringens type A or type G strain. Furthermore, C. perfringens challenge of Eimeria infected birds did not affect the activity of the other gelatinolytic enzymes in the jejunal tissue (Table 2).

Table 2 Gelatinolytic activity of jejunal samples ofEimeriaandC. perfringenstype A- or type G-infected broilers

MMP activity is decreased within NE lesions

In order to assess whether the difference in disease susceptibility between birds within the C. perfringens type G strain challenged group might be related to an altered reaction of host MMP activity on the C. perfringens challenge, the gelatinolytic activity of macroscopically healthy jejunal tissue of birds that developed NE was compared to birds that did not develop NE, but were infected with the same C. perfringens type G strain. No differences in MMP activities were observed in macroscopically unaffected jejunal tissue of birds suffering from NE as compared to unaffected birds (Table 2).

Additionally, to assess the involvement of host MMPs in lesion development, the MMP activity within the necrotic lesions was compared to the activity in macroscopically unaffected tissue adjacent to the lesions. The activity of two MMPs with a molecular weight of approximately 50–60 and 60–70 kDa (presumably MMP2 which has a MW of ~ 62 kDa) was significantly lower in tissue derived from the lesions as compared to macroscopically unaffected tissue adjacent to the lesions (respectively p = 0.0107 and 0.0341). No difference in activity of the 40–45 kDa or 75–85 kDa enzymes was observed (Figure 1).

Figure 1
figure 1

Gelatinolytic activity in jejunal tissue of necrotic enteritis affected birds. Lesions and macroscopically unaffected jejunal tissue 1 cm adjacent to the lesion was derived from broilers receiving a predisposing Eimeria infection, followed by a pathogenic C. perfringens type G strain (CP56) challenged. Gelatinolytic activity was analyzed by gelatin zymography and quantification of the digested spots is expressed in arbitrary units = \(\frac{100}{{OD/{\text{mm}}^{2} }}\). = p ≤ 0.05 (Paired Student’s t-test).


MMPs play an important role in degrading components of the extracellular matrix and basement membrane [29]. In addition to ECM degradation, MMPs are involved in multiple physiological processes, like innate and adaptive immunity and inflammation, by regulating the release and activation of cytokines, growth factors, antibiotic peptides and other bioactive molecules [30, 31]. Expression of MMPs is tightly regulated by a complex process of enzyme synthesis, secretion, activation, and inhibition, which results in low basal levels of these enzymes in healthy tissue [32]. Still, an overexpression of host collagenases results in tissue destruction and local inflammation and has been associated with multiple inflammatory diseases and pathological processes [33]. In this study we investigated whether challenge of broiler chickens with either a pathogenic, netB-positive or a non-pathogenic, netB-negative C. perfringens strain affects the jejunal expression of host-derived MMPs using an experimental model of NE involving a predisposing Eimeria infection.

As expected, only the netB-positive C. perfringens type G strain was able to induce NE. Postmortem examinations of NE affected birds showed that necrotic lesions are more prevalent and severe in the jejunum compared to other segments of the small intestine. The distribution of intestinal lesions in the present infection study is in accordance with older studies of both laboratory consignments and field cases of NE [18]. Why this segment of the small intestine is more prone to develop lesions is hitherto unknown.

Clostridial challenge of Eimeria infected birds significantly reduced the gelatinolytic activity in the broiler jejunum as compared to unchallenged Eimeria infected control birds. Indeed, even when no macroscopic lesions were observed, challenge with either a non-pathogenic type A strain or a pathogenic C. perfringens type G strain both resulted in reduced activity of a specific intestinal collagenase with a molecular weight of 40-45 kDa. Moreover, the activity of two larger MMPs was significantly reduced (an unknown MMP with a MW of 50-60 kDa and a 60-70 kDa MMP, presumably MMP2) in necrotic tissue as compared to the activity in macroscopically healthy tissue adjacent to the lesion. This is in contrast to previous findings from Olkowski et al., where a significant increase of MMP activity was observed in necrotic tissue as compared to the activity in healthy tissue from unchallenged control birds [16]. However, it should be noted that no comparison with unaffected tissue from C. perfringens challenged birds was made. Furthermore, Olkowski et al. induced NE by two oral C. perfringens inoculations without a preceding Eimeria infection [16]. Yet, coccidiosis plays an important role in the occurrence and severity of outbreaks of NE and is commonly used as a predisposing factor in experimental NE models [17]. Therefore, in the present study, a necrotic enteritis challenge model was used that includes a predisposing Eimeria infection caused by administering an overdose of commercially available coccidial vaccines which is followed by the administration of C. perfringens for 3 consecutive days.

Park et al. already demonstrated a differential expression of various genes involved in innate immunity when broilers were co-infected with Eimeria and C. perfringens as compared to challenge with either pathogen alone, suggesting that the host inflammatory response is fundamentally different during dual infection [34]. In the current study, we assessed the effect of C. perfringens challenge on host MMP activity, in the presence of a predisposing Eimeria infection. The contradictory findings between the current study and previous results from Olkowski et al. indicate that primary infection with Eimeria might increase the collagenase activity, whereas subsequent C. perfringens might dampen this response again. However, no reports are available studying the effect of Eimeria infection on the collagenase activity in the small intestine. Also in the current study no conclusions can be drawn on the effect of single Eimeria infection on host MMP activity, as no unchallenged birds or birds infected with C. perfringens alone were used. Nevertheless, our study indicates the importance of using an experimental NE model which resembles the reality in animal farming as close as possible as different models can lead to unexpected contradictory results.

In conclusion, C. perfringens challenge reduced the MMP activity in the jejunal tissue of Eimeria infected broilers. These results indicate that host collagenases are not elicited by the C. perfringens infection for permeabilizing the host mucosa to allow penetration of the NetB toxin in Eimeria infected broilers. This is in contrast to the previous reported increase of MMP activity in the necrotic lesions of C. perfringens challenged birds in the absence of a predisposing Eimeria infection. Further studies are needed to fully characterize the effect of Eimeria challenge, as well as the combined challenge of Eimeria and C. perfringens, on specific MMP activity in the broiler intestine, as compared to uninfected healthy controls. One interesting topic for future work includes the identification of the differential expressed host MMPs that were observed in this study.

Availability of data and materials

All data are available on request.



necrotic enteritis


arbitrary units


matrix metalloproteinase


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The authors are thankful for the assistance of the Ph.D. students, post-docs and scientific staff of the Department of Pathology, Bacteriology and Avian Diseases during the conduct of the necrotic enteritis in vivo trial.


EG is supported by the Research Foundation Flanders (FWO) under Grant Number [12W8919N]. The presented work was funded by a Grant from Evonik Nutrition and Care.

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Study design: LVD, RD, FVI, EG; Animal experiments: LVD, NC, MD, CC, EG; in vitro experiments: LVD, NC, CC; Preparation of the manuscript: LVD, FH, RD, FVI, EG; All authors offered a critical review of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Filip Van Immerseel.

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Van Damme, L., Cox, N., Callens, C. et al. C. perfringens challenge reduces matrix metalloproteinase activity in the jejunal mucosa of Eimeria-infected broiler chickens. Vet Res 51, 100 (2020).

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