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AIMS Cell and Tissue Engineering

2017, Volume 1, Issue 2: 84-103. doi: 10.3934/celltissue.2017.2.84
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Research article Special Issues

Immunohistochemical Measurement of TGF-β1 and Factor VIII in the Skin of Horses Treated with Leukocyte-poor Platelet-rich Plasma: A Randomized Controlled Trial

  • 1.
    Departamento de Veterinária, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil
  • 2.
    Laboratório de Processamento de Tecido, Universidade Federal de São João del-Rei, Divinópolis, MG, Brazil
  • 3.
    Laboratório de Patologia Experimental, Universidade Federal de São João del-Rei, Divinópolis, MG, Brazil
  • Platelet-rich plasma (PRP) is a treatment used for several diseases of various species and different body regions. However, there is controversy about its therapeutic efficacy. The objective of this experiment was to immunohistochemically evaluate the expression of transforming growth factor beta 1 (TGF-β1) and factor VIII during the healing period of skin treated with leukocyte-poor platelet-rich plasma (LP-PRP) in seven healthy gelding crossbred horses. This study was a randomized controlled clinical trial. Wounds were surgically induced in gluteal region (treated group), and LP-PRP (0.5 mL) was injected into all borders of the wounds 12 h later. The contralateral region (untreated) was adopted as the control group. Five skin samples were obtained from the treated and untreated groups for immunohistochemical analysis. The last one was collected upon wound closure. We hypothesized that the treated wounds would exhibit higher expression of both TGF-β1 and factor VIII than the untreated wounds. There was no difference between groups in TGF-β1 immunostaining. However, a difference was observed between groups in immunostaining of blood vessels for factor VIII. This difference (P < 0.05) occurred after macroscopic wound closure, with larger numbers of vessels stained in the treated wounds. The administration of a single dose of LP-PRP 12 h after wound induction in horses is not effective compared with the physiological healing of horse skin. Further research should not only take into consideration the association of the platelet-rich component with stem cells, which, in general, have provided adequate responses, but also evaluate other proteins present in PRP besides those typically studied.

    Citation: Maria V. Souza, Mariana B. Silva, Hélio B. Santos, Rosy I. M. A. Ribeiro, Thayne O. Silva, Ralph G. Thomé. Immunohistochemical Measurement of TGF-β1 and Factor VIII in the Skin of Horses Treated with Leukocyte-poor Platelet-rich Plasma: A Randomized Controlled Trial[J]. AIMS Cell and Tissue Engineering, 2017, 1(2): 84-103. doi: 10.3934/celltissue.2017.2.84

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  • Platelet-rich plasma (PRP) is a treatment used for several diseases of various species and different body regions. However, there is controversy about its therapeutic efficacy. The objective of this experiment was to immunohistochemically evaluate the expression of transforming growth factor beta 1 (TGF-β1) and factor VIII during the healing period of skin treated with leukocyte-poor platelet-rich plasma (LP-PRP) in seven healthy gelding crossbred horses. This study was a randomized controlled clinical trial. Wounds were surgically induced in gluteal region (treated group), and LP-PRP (0.5 mL) was injected into all borders of the wounds 12 h later. The contralateral region (untreated) was adopted as the control group. Five skin samples were obtained from the treated and untreated groups for immunohistochemical analysis. The last one was collected upon wound closure. We hypothesized that the treated wounds would exhibit higher expression of both TGF-β1 and factor VIII than the untreated wounds. There was no difference between groups in TGF-β1 immunostaining. However, a difference was observed between groups in immunostaining of blood vessels for factor VIII. This difference (P < 0.05) occurred after macroscopic wound closure, with larger numbers of vessels stained in the treated wounds. The administration of a single dose of LP-PRP 12 h after wound induction in horses is not effective compared with the physiological healing of horse skin. Further research should not only take into consideration the association of the platelet-rich component with stem cells, which, in general, have provided adequate responses, but also evaluate other proteins present in PRP besides those typically studied.


    1.   Introduction

    V. cholera is a gram-negative, facultative, motile anaerobe that secrets a diarrhoeagenic protein called cholera toxin [1]. The organism has over 200 serogroups, but only the O1 and O139 serogroups have been linked to the diarrheal disease commonly known as cholera [2]. In third world countries, the organism typically transmits by drinking contaminated surface water [3], whereas, in developed countries, transmissions are associated with raw or undercooked shellfish consumption [4]. Cholera is a frequent occurrence in Bangladesh, with seasonal outbreaks occurring annually [5]. Since V. cholera is predominantly an aquatic organism, the propagation and epidemiology of these outbreaks are highly influenced by contaminated water sources and flooding. In most rural areas of Bangladesh, access to potable clean drinking water is minimal, especially during annual flooding. A vast majority of the population still drinks untreated surface water in rural areas of the country and most of these annual outbreak buds in those populations.

    Furthermore, underground water sources like tube wells are often submerged and contaminated by flood water during annual flooding. Thus, it is crucial to perform a comparative study of V. cholera contamination among different surface and underground water sources as a part of consistent surveillance operation. Besides, annual cholera outbreaks are often treated with the same group of antibiotics, resulting in a high antibiotic resistance in V. cholera strains against commonly used antibiotics. A yearly evaluation of the antibiotic resistance profile of field strains is necessary for the effective therapeutic use of available antibiotics. Therefore, this research aimed at quantifying V. spp. in different water sources of Bangladesh and evaluating the antibiotic resistance profile of V. cholera to estimate and mitigate the risk of the annual cholera outbreak.

    2.   Materials and methods

    2.1.   Sample collection, bacteria isolation, and quantification

    A total of 45 environmental water samples were aseptically collected from pond, river and tube-well of different designated areas of Gazipur district, Bangladesh (Benupur, Chandabaha, Kaliakoir, Sutrapur and Begunbari). Following collection 4 samples are then serially diluted in alkaline peptone water and streak on selective media of Thiosulfate Citrate Bile Salts Sucrose (TCBS) agar, (Hi media, India) and incubated 37 °C for 24 hours. Following incubation, colonies with shiny yellow color and smooth, convex, and slightly flattened texture with opaque centers (Figure 1A, 1B) were used in viable count of V. spp. [6]. For bacteria isolation 1 mL of buffer peptone solution (1:10 dilution) was enriched in nutrient broth at 37 °C for 16 hours and then transferred in selective media (TCBS agar plate) for incubation (37 °C for 24 hours). Then one colony was randomly selected from each plate for biochemical analysis and hemolysis test (Figure 1C, 1D).

    Table 1.  Concentration (µg /disc) of antibiotic disc used for antimicrobial resistance test.
    Antibiotics Symbol Disc concentration (µg /disc)
    Ciprofloxacin (CIP) 5
    Gentamycin (GEN) 10
    Penicillin (P) 10
    Vancomycin (VA) 30
    Cephalexin (CN) 30
    Chloramphenicol (C) 30
    Tetracycline (TE) 30
    Erythromycin (E) 15
    Sulfamethoxazole (SXT) 25
    Nalidixic Acid (NA) 30
    Azithromycin (AZ) 15
     | Show Table
    DownLoad: CSV

    2.2.   Biochemical test

    V. spp. isolated in selective media were confirmed as V. cholera by different biochemical tests Catalase, Oxidase, MR, VP, Indole, glucose, maltose, mannitol and sucrose fermentation) according to the methodology described in [7].

    Table 2.  Bacterial concentration in different sources collected from 5 different locations.
    Sample type Bacterial conc. (Log CFU/mL)
    10−3 DF1 10−4 DF1 10−5 DF1
    River 4.96A 5.89A 6.79a
    Pond 4.98A 5.92A 6.80a
    Tube well 4.86B 5.73B 6.06b
    SEM2 0.028 0.035 0.500
    P value <0.0001 <0.0001 <0.0001
     | Show Table
    DownLoad: CSV

    2.3.   Antibiotic susceptibility test

    Antibiotic sensitivity test was performed according to Kriby-Bauer disc diffusion method [9] and following the guideline of Clinical and Laboratory Standards Institute [8]. A total of 11 commercially available antibiotics were used (Table 1) in this research to assess drug susceptibility and resistance of isolated species (Mast diagnostics Mersey side, UK). A single colony of pure culture isolated from the samples was incubated in nutrient broth at 37 °C for 16 hours. Then 0.1 ml of broth was spread on Mueller-Hinton agar plate using a cell spreader and an antibiotic disc was placed on top. The plates were then incubated in 37 °C for 24 hours. After incubation, the zone of inhibition near the discs was measured using a millimeter scale and categorized as resistant or sensitive according to the manufacturer's recommendation (Table 1).

    Table 3.  V. spp. concentration in water samples of 5 different location (Benupur, Chandabadha, Kaliakoir, Sutrapur and Begunbari).
    Sample type DF1 Bacterial concentration in each location (Log CFU/mL)
    Benupur Chandabaha Kaliakoir Sutrapur Begunbari
    River Burigonga 10−3 4.95 5.00 4.93 4.99 4.94
    10−4 5.88 5.93 5.87 5.90 5.88
    10−5 6.79 6.80 6.81 6.81 6.79
    Pond 10−3 4.94 4.99 5.00 4.99 5.00
    10−4 5.90 5.89 5.93 5.90 5.87
    10−5 6.80 6.79 6.80 6.77 6.72
    Tube-well 10−3 4.91 4.86 4.86 4.83 5.00
    10−4 5.81 5.76 5.71 5.68 5.89
    10−5 6.62 6.52 6.46 6.57 7.00
    Average 5.84 5.83 5.82 5.83 5.90
    SEM2 0.261 0.257 0.261 0.259 0.247
    P-value 0.996

    *Note: CFU= colony forming unite, 1DF = Dilution factor, 2SEM= Standard error of mean

     | Show Table
    DownLoad: CSV

    2.4.   Statistical analysis

    A total of 5 replicate samples were randomly collected from each of the 5 different locations (Benupur, Chandabaha, Kaliakoir, Sutrapur, Begunbari) of each 3 water sources (river, pond and tube-well). Bacterial concentration in samples were log transformed and subjected to Shapiro-Wilk test for normality analysis. Bartlett's Test was performed to ensure the homogeneity of variance among the collected samples. The bacterial concentration in different water sources and at different locations were analyzed with one-way ANOVA using the GLM procedure of SAS software (version 9.2) under the following model. Yij = µ + Ti + δL + ϵij. Where, Yij = Bacterial concentration in each sample; µ = Overall mean bacterial concentration; Ti = Effect of water source; δL = Blocking effect of location and ϵij = random error. We assumed that the variation within the model, caused by from sampling location are normally distributed with a mean of 0 and a variance of σL2. Random error ϵij of the model is also normally distributed with a mean of 0 and a variance of σ2. Both variances σL2 and σ2 are independent of each other. For data analysis, P < 0.05 was considered statistically significant and when a significant difference is detected, the were subjected to the least significant difference test (LSD) for mean separation.

    Figure 1.  V. spp. on Nutrient's Agar (A), TCBS Agar left the yellow colony and green colony right (B), blood agar hemolytic colony (C), and non-hemolytic colony on blood agar (D).
    DownLoad: Full-Size Img PowerPoint
    Figure 2.  Biochemical test results. Indole test (A), Methyl red test (B), Voges-Proskauer test (C), Simmons citrate test (D), KIA test (E), and MIU test (F).
    DownLoad: Full-Size Img PowerPoint
    Table 4.  Biochemical tests result of 12 isolated strains of V. cholera.
    Tests Results
    R1 R3 R5 R6 R7 P1 P3 P5 P6 T3 T4 T7
    Nit + + + + + + + + + + + +
    Ox + + + + + + - + + + - +
    Ind + + + + - + + + + + + +
    Ci + + + + + + + + + + + +
    MR - - - + - - - + - - - -
    VP + + + + + + + + + + + +
    MIU + + + + + + + - + + + +
    Urease - - - - - - + - - - - -
    KIA Yb, Ys, G= -H2S= - Yb, Ys, G= -H2S= - Yb, Ys, G= -H2S= - Yb, Ys, G= -H2S= - Yb, Ys, G= -H2S= - Yb Ys, G= -H2S= - Yb, Ys, G= -H2S= - Yb, Ys, G= -H2S= - Yb, Ys, G= -H2S= - Yb, Ys, G= -H2S= - Yb, Ys, G= -H2S= - Yb, Ys, G= -H2S= -
    Glucose + + + - + + - + + + - +
    Maltose + + + + + + + + + - + +
    Mannitol + + + + + + + + + + + +
    Sucrose + + + + - + + + + + + +
    Gelatin hydrolysis + + + + + + - + + + + +

    *Note: Legends: SL No.: Serial Number, Nit: Nitrate utilization test, Ox: Oxidase test, In: Indole test, Ci: Citrate test, MR: Methyl Red test, VP: Voges-Proskauer test, MIU: Motility indole urease, KIA: Kinglar iron agar +: positive, -: Negative, Y: Yellow, B: Butt, S: Slant, G: Gas.

     | Show Table
    DownLoad: CSV

    3.   Results and discussion

    Viable counts were performed on TCBS agar plate which selects V. spp. based on their sucrose fermentation characteristics and the result is presented in Table 2. There was significantly higher V. spp. in pond and river water than tube-well water (P < 0.001) at all 3 dilution levels (dilution factor: 103, 104 and 105). Bacterial concentration did not vary significantly based on the location of sample collection (P > 0.05) (Table 3).

    Table 5.  Comparative prevalence of V. cholera among the V. spp. isolated from different water sources.
    Bacterial isolate River water Pond water Tube well water Total isolates Percentage (%)
    V. cholera 5 (41.67%) 4 (40%) 3(37.5%) 12 40
    V. parahimulyticus 7 (58.33%) 6 (60%) 5 (62.5%) 18 60
    Total isolates 12 10 8 30
     | Show Table
    DownLoad: CSV

    Total of 14 biochemical tests were performed on isolates of different samples and the result of those tests are presented in Table 4. Out of the 30 isolates, 12 isolates were positive in nitrate, oxidase, indole, citrate utilization, MR, motility, glucose, sucrose, mannitol, maltose, and gelatin hydrolysis agar test (Figure 2A, 2F). V. spp. were also found to be negative in MR, urease, and kingler iron agar test. Hemolytic characteristics of the isolates were also evaluated to differentiate between V. cholera and V. parahaemolyticus (Figure 1C, 1D). V. cholera are known to cause β-hemolysis whereas V. parahaemolyticus causes α-hemolysis. Based on this characteristic 12 of the initial isolates were classified as V. cholera and remaining 18 was classified as V. parahaemolyticus.

    The comparative prevalence of V. cholera among the V. spp. isolated from different water sources are presented in Table 5. River water had the highest prevalence of V. cholera (5 out of 12 isolates; 41.67%) whereas, tube-well water had the lowest prevalence (3 out of 8; 37.5%).

    Table 6.  Outcome of antibiotic sensitivity test of 12 V. cholera isolates obtained from different water samples.
    Isolate GEN CIP CN VA P C TE E NA AZ SXT
    R1 S S S R R S S I I S S
    R3 S S S R R S S R R S S
    R5 S S S I R S I R R S S
    R6 S S S R R S I I R R S
    R7 S S S R R R R R R S S
    P1 S S S R R S R R R S S
    P3 S S S R R S R R R S M
    P5 S S S R R I I R R S S
    P6 S S I I I S I R R R S
    T3 S S I R R S S I R S S
    T4 S S R R R S S I R S S
    T7 S S R I R S I R R S S

    *Note: GEN: Gentamycin, CIP: Ciprofloxacin, CN: Cephalexin, VA: Vancomycin, P: Penicillin, C: Chloramphenicol, TE: Tetracycline, E: Erythromycin, NA: Nalidixic Acid, AZ: Azithromycin, SXT: Sulfamethoxazole, R: River, P; Pond; T; Tap, s: Sensitive and r: Resistance. R1, R3, R5, R6, R7 are the V. cholera isolates collected from rivers, P1, P3, P5 and P6 are the V. cholera isolates collected from pond, T3, T4 and T7 are the V. cholera isolates collected from tube-well.

     | Show Table
    DownLoad: CSV

    The results of antibiotic sensitivity test performed on 12 V. cholera isolates are presented in Table 6. The antibiotic sensitivity profiles of those isolates have been compiled in Table 7. All 12 isolates showed 100% sensitivity toward Gentamicin and ciprofloxacin. All the isolates showed multidrug resistance (Table 6). However, these isolates were susceptible to Chloramphenicol (91.67%), and Sulfamethoxazole (91.67%). Azithromycin (66.67%). Tetracycline (33.33%), and Cephalexin (16.67%) had moderate to low sensitivity. All 12 isolates showed 100% resistance toward Penicillin, Vancomycin, Erythromycin, and Nalidixic Acid. This result is congruent with the study of [10] performed in neighboring country Nepal, where they found their isolates sensitive to Ciprofloxacin, Ampicillin, and resistant to Nalidixic acid. However, unlike this study, their isolates also showed higher sensitivity toward Erythromycin and Tetracycline. The majority of resistance in environmental species are thought to have originated from historically resistant organisms. As a result, it's essential to keep track of both the frequency and the antimicrobial resistance profile of V. cholera to identify the high-risk water sources. To minimize the risk of cholera transmission through contaminated water, we recommend screening various water sources against this pathogenic bacteria before using it for washing, drinking and irrigation. Vulnerable populations, especially farmers in rural areas, should take appropriate precautions to avoid cholera transmission through water [11]. There were some limitations to our research. Due to the funding constrain, a limited number of samples were collected, which might not be sufficient to draw a precise conclusion. Our analysis still lacks molecular characterization of the isolates, which might have strengthened our conclusion.

    Table 7.  Antibiotic sensitivity profile of 12 isolates V. spp. obtained from different water samples.
    Organism Antibiotics Susceptibility (%) Resistance (%)
    V. cholera Gentamycin (GEN) 12(100%) 0(0%)
    Ciprofloxacin (CIP) 12(100%) 0(0%)
    Cephalexin (CN) 2(16.67%) 10(83.33%)
    Vancomycin (VA) 0(0%) 12(100%)
    Penicillin (P) 0(0%) 12(100%)
    Chloramphenicol (C) 11(91.67%) 1(8.33%)
    Tetracycline (TE) 4(33.33%) 8(66.67%)
    Erythromycin (E) 0(0%) 12(100%)
    Sulfamethoxazole (SXT) 11(91.67%) 1(8.33%)
    Nalidixic Acid (NA) 0(0%) 12(100%)
    Azithromycin (AZ) 8(66.67%) 4(33.33%)
     | Show Table
    DownLoad: CSV

    4.   Conclusion

    Based on the data of our experiment we conclude that V. cholera is endemic to the surface water sources like pond and river in Gazipur region of Bangladesh. Underground water like tube well has comparatively lower concentration of V. cholera Antibiotics like, Gentamicin, Ciprofloxacin, Chloramphenicol, Sulfamethoxazole and Azithromycin are highly effective against the V. cholera isolates collected in this study. We suggest the application of these antibiotics in therapeutics of annual cholera outbreak. Furthermore, we highly recommend prioritizing underground water over surface water as drinking water source.

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