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<p class="art-type" id="articleinfo">Research Article</p>
<p class="art-title">Transgenic Plant expressed Hemaggulutinin against Low Pathogenic Avian Influenza Virus<br/><span style="font-size: 16px">Short title: Transgenic plant vaccine against avian influenza.</span></p>
<p class="art-author"><?php $authors="Hongzhuan Wu<sup>1*</sup>, Karyn Scissum-Gunn<sup>1</sup>, Lula Smith<sup>1</sup> and Joseph J Giambrone<sup>2</sup>"; echo (stristr($authors,$coauthor))?str_replace($coauthor,"<a href='".$extpath."authors/".$courl."' target='_blank'>".$coauthor."</a>",$authors):$authors; ?></p>
<p class="art-affl"><sup>1</sup>Department of Biological Sciences, Alabama State University, AL, 36101, USA<br/><sup>2</sup>Department of Poultry Science, Auburn University, AL, 36849, USA</p>
<p class="art-aff"><b>*Corresponding author: <?php $corresponding_author="Hongzhuan Wu"; echo ($coauthor!="" && $coauthor==$corresponding_author)?"<a href='".$extpath."authors/".$courl."' target='_blank'>".$coauthor."</a>":$corresponding_author;?></b>, Professor, Department of Biological Sciences, Alabama State University, AL 36849, USA, E-mail: <a href="mailto:hwu@alasu.edu">hwu@alasu.edu</a></p>
<p class="art-aff"><b>Received:</b> June 29, 2017 <b>Accepted:</b> August 12, 2017 <b>Published:</b> August 18, 2017</p>
<p class="art-aff"><b>Citation:</b> Wu H, Scissum-Gunn K, Smith L, Giambrone JJ. Transgenic Plant Expressed Hemaggulutinin against Low Pathogenic Avian Influenza Virus. <i>Madridge J Clin Res</i>. 2017; 1(1): 10-14. doi: <a href="https://doi.org/10.18689/mjcr-1000102">10.18689/mjcr-1000102</a></p>
<p class="art-aff"><b>Copyright:</b> &copy; 2017 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</p>
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<p class="art-subhead" id="abstract">Abstract</p>
<p class="art-para">Avian influenza virus (AIV) can cause severe disease in poultry flocks worldwide. Highly pathogenic (HP) H5N1and H7N9 AIVs are important causes of morbidity and mortality. Effective vaccines against AI in poultry need to be developed for use in emergency responses for a limited area to stop viral spread. A transgenic <i>Arabidopsis</i> expressing the hemagglutinin (HA) gene of the low pathogenic LPH1N1sub type was constructed, and immune response evaluated in chickens. The study demonstrated that chickens given high or low doses of HA transgenic total soluble protein (TSP) orally had a higher HI antibody, enhanced cytokine responses, and a reduction in virus shedding compared to chickens given a commercial inactivated vaccine after challenge. In addition, chickens given the transgenic plant vaccine (TPV) had better weight gain than those given the commercial vaccine. The TPV has the potential to serve as a vaccine against AIV inpoultry.</p>
<p class="art-para"><b>Keywords:</b> Avian Influenza Virus; HA; H1N1; Transgenic plant; Vaccine.</p>
<p class="art-para"><b>Abbreviations:</b> AIV: Avian Influenza Virus; HA: Hemagglutinin; ELISA: = Enzyme Linked Immunosorbent Assay; EMM: Edinburgh Minimal Medium: Ig: Immunoglobulin; OD: Optical Density; PAGE: Polyacrylamide Gel Electrophoresis; PBS: phosphate Buffered Saline; PCR: Polymerase Chain Reaction; qRRT-PCR: Quantitate Real-Time ReverseTranscriptase-Polymerase Chain Reaction; RT: Reverse Transcription; SDS: Sodium Dodecyl Sulfate; SPF: Specific-Pathogen Free; TE: TRIS EDTA; wks: Weeks.</p>
<p class="art-subhead" id="intro">Introduction</p>
<p class="art-para">AIisan important viral disease that is spreading worldwide in poultry. AIVs are subdivided using hemagglutinin (HA) and neuraminidase (NA) proteins. AIVs are also divided into high pathogenic (HP) and low pathogenic (LP) types. HPAIVs cause severe morbidity and mortality, whereas LPAIVs cause only mild respiratory disease. In addition, the virus is genetically unstable and LPAIVs can mutate into HPAIVs at the same farm. AIVs infect a variety of animals including chickens, quail, turkeys, ducks, geese, pigs, and humans <a href="#1" id="ref1">[1]</a>. The recent pandemic outbreak of influenza virus in humans, which was caused by the H1N1 contained part of an avian-originated HA sequence <a href="#3" id="ref3">[3]</a>.</p>
<p class="art-para">Control of AI in poultry in modern countries is done using quarantine measures, culling of infected poultry flocks, and improved biosecurity. Vaccination in emergency situations maybe important to limit disease outbreaks. In less developed countries, where AIVs are endemic, vaccines are routinely used. These vaccines often produced low efficacy. The following strategies have been developed for AIV vaccines: recombinant, subunit hemagglutinin inactivated proteins, reverse genetic, and DNA vaccines <a href="#4" id="ref4">[4</a>, <a href="#5" id="ref5">5</a>, <a href="#6" id="ref6">6</a>, <a href="#7" id="ref7">7</a>, <a href="#8" id="ref8">8</a>, <a href="#10" id="ref10">10</a>, <a href="#12" id="ref12">12</a>, <a href="#13" id="ref13">13</a>, <a href="#14" id="ref14">14</a>, <a href="#15" id="ref15">15</a>, <a href="#16" id="ref16">16</a>, <a href="#17" id="ref17">17</a>, <a href="#18" id="ref18">18</a>, <a href="#19" id="ref19">19]</a>. Edible vaccines are cost effective, easily stored, are transported without degradation or damage, and their production time and cost are minimal compared to conventionally produced vaccines <a href="#9" id="ref9">[9]</a>. The hemagglutinin (HA) surface glycoprotein promotes influenza virus entry and is the key protective antigen in natural infections and vaccinations. In this study, a transgenic Arabidopsis, which incorporated the HA gene of LP AIV, was developed and its efficacy tested in chickens.</p>
<p class="art-subhead" id="methods">Materials and Methods</p>
<p class="art-para"><b>Animals:</b> Broilers having no maternal antibodies against AIV from the Auburn University poultry farm were used. All were given feed and water <i>ad libitum</i>. They were reared in isolation units maintained with filtered air under positive pressure following the guidelines of the Auburn University Institutional Animal Care and Use Committee guidelines.</p>
<p class="art-para"><b>Extraction of viral RNA.</b> RNA was extracted from allantoic fluid of embryos infected with AIV. The RNA was extracted using a Trizol RNA (Invitrogen, Carlsbad, CA). Anti-AIV poly sera, were provided by Lohmann, Inc. (Winslow, ME).</p>
<p class="art-para"><b>Construction of HA plant expression cassette.</b> The HA cDNA was prepared from RNA using an RT-PCR preamplification system (GIBCO-BRL, Grand Island, NY). Primers flanking the HA sequence were designed according to information in the GenBank and with restriction sites for directional cloning of amplified sequences as shown below:</p>
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<img src="<?php echo $imgpath;?>images/mjcr-102-f001.gif" class="img-responsive center-block"/></div>
<p class="art-para">The plant expression vector pE1857 <a href="#23" id="ref23">[23]</a> was obtained from a patent transfer agreement (S. Gelvin, personal communication). The vector was derived from a kanamycin-resistant pGPTV plasmid containing the patented super-promoter, <i>TEV</i> translational leader, polylinker derived from pBluescript, and <i>ags</i> terminator in pUC119. The PCR amplification product was electrophoresed after <i>Xba</i> I and <i>Xh</i>oI digestion, purified using a Geneclean II kit (Qbiogene, Inc., Carlsbad, CA) and cloned into the plant expression vector, pE1857. This construct was designated rpE-HA (<a href="#f001">Fig.1</a>). The insert sequence was confirmed by DNA sequencing (Auburn University Sequencing Laboratory).</p>
<p class="art-para"><b>Selection of transgenic plants.</b> The rpE- HA and the control vector, pE1857 were introduced into <i>Agrobacterium tumefaciens</i> strain C58C1 by electroporation and used to transform <i>A. thaliana</i> by vacuum infiltration <a href="#22" id="ref22">[22]</a>. Seeds were harvested from the self-pollinated primary transformants to generate plants for screening. Seedlings germinating in Promix potting medium were sprayed every day for 3 days with a solution of 50 mg/ml of bialaphos (Sigma Co. Creamville, N. J.). After 5 days, procedures were repeated for an additional 3 days. Seeds from surviving plants were harvested for bialaphos selection and performed for 3 additional generations to obtain homozygous transgenic lines. Plants resistant to bialophos (glufosinate) and showing homozygous segregation were selected.</p>
<p class="art-para"><b>Analysis HA gene expression in plants.</b> The HA transgenes were demonstrated by real time RT-PCR <a href="#23" id="ref23">[23]</a>. Total RNA from transgenic and wild type <i>A. thaliana</i> were obtained from 1 g of leaf tissues by an RNA isolation system (Omega Bio-tek, Inc, GA). Real time RT- PCR was performed in the ABI 7300 real-time PCR system (Foster, CA) using Quantitect SYBR Green RT-PCR kit (Mainz, Germany) using the manufacturer&#700;s instructions.</p>
<p class="art-para">Expression of HA protein was confirmed by western blot. Leaves (~1 g) were ground to a powder in liquid nitrogen and added to 1 ml of extraction buffer (10 mM 2(N-morpholino) ethanesulfonic acid (Mes), pH 6.0, 10mM NaCl, 5 mM EDTA, 0.6% Triton X-100, 0.25 M sucrose, 0.15 mM spermine, 0.5 mM spermidine, 10 mM DTT, and 1 mM phenylmethyl sulfonyl fluoride). Homogenates were centrifuged twice at 12,000 x g for 15 min at 4 0C to remove insoluble debris and supernatants subjected to SDS-PAGE followed by electro blotting onto nitrocellulose membranes using BioRad Semi-dry Trans Blotter (BIO-RAD, Hercules, CA). Membranes were blocked with 3% skim milk and probed with polyclonal anti-AIV chicken sera at a 1:500 dilution. Immune complex was detected by horseradish peroxidase (HRP)-conjugated anti-chicken immunoglobulin G (Jackson ImmunoResearch Laboratories Inc., West Grove, PA) at a 1:1000 dilution.</p>
<p class="art-para">Total soluble protein (TSP) concentrations were determined using Bradford assay <a href="#2" id="ref2">[2]</a>. HA protein concentrations were determined by antigen-capture (AC) ELISA <a href="#21" id="ref21">[21]</a>. Plates were coated at 4 0C overnight with polyclonal anti-HA-chicken serum diluted at 1:1000 in PBS buffer pH 8.0, washed 3 times with PBST (phosphate-buffered saline with 0.05% Tween-20) buffer, and blocked with PBST buffer containing 5% skim milk at 37 0C for 3hr. Plates were washed 3 times with PBST and dried and stored at 4 0C.</p>
<p class="art-subhead">Vaccination and Challenge</p>
<p class="art-para">One-day-old chickens were placed into 5 groups at 10 birds per group. Chickens in groups 1 and 2 were orally given 50 &#181;g and 100 &#181;g total leaf proteins respectively, containing the HA in 1ml of saline weekly for 3 consecutive weeks. Groups 3 chickens received orally 125&#181;g protein extracted from wild type Arabidopsis in 1 ml of saline Group 4 birds were given a single dose of commercial inactivated vaccine (Lohman Inc., Winslow, ME) intramuscularly and group 5 chickens received orally the Arabidopsis containing only the pE1857 vector in 1 ml of saline, respectively; Sera from 10 birds were collected at day of age by exsanguination and tested for material antibody (AB) against AIV. The remaining birds were bleed weekly post vaccination (PV) and tested by hemagglutination inhibition (HI). Spleens from one chicken / group were collected weekly and 3 at the end of the trial, using real- time quantitative PCR to detect cellular immune responses as measured by IL-2 and IL-6 cytokines. At day 23 PV, chickens were challenged with 0.2 ml of 108.5 TCID50 of LP H1N1 AIV by nose and eye drop. This AIV was isolated from healthy hunter killed ducks in Lake City, FL. We used this LP virus, because we lack BL3 containment. Chickens were monitored for 1 week post-challenge (PC) for clinical signs. Oropharyngeal and cloaca swabs were collected for virus isolation from each group at 3, 5, and 7 days PC. Swabs were placed in PBS and RNA was extracted and evaluated by RT-PCR to determine virus shedding.</p>
<p class="art-para"><b>Hemagglutination inhibition (HI):</b> Serum samples were heat inactivated at 560C for 30 min. HA units were determined before each assay using two-fold dilutions. Sera were diluted twofold in 25 &#181;l PBS, and 4 HAs of H1N1 used in 25&#181;l. Contents of each well were mixed and plates were incubated for 30 min at room temperature (RT). Finally, 50 &#181;l of a 0.5% chicken erythrocyte suspension was added to each well. The highest dilution preventing hemagglutination was the HI titer. Data were reported as geometric means with standard deviation from three independent replicates.</p>
<p class="art-para"><b>ELISA testing:</b> Blood was collected at weekly intervals AB determined with an enzyme- linked immunosorbent assay (ELISA) kit (Synbiotics Co, Kansas City, MO) following published protocols <a href="#20" id="ref20">[20]</a>. Plates were coated with 100 &#181;l AIV; blocked and then ten-fold serials of serum were added to designated wells overnight. Plates were incubated for 1 h at RT, washed, followed by addition of HRP-conjugated goat-chicken Ig (100&#181;l, 1:2000) (Southern Biotech Associates Inc. (SBA), Birmingham, AL). 100&#181;l TMB substrate was used for enzyme reactions and the absorbance read at 450nm using a Tecan ELISA plate reader (Tecan Inc., Research Triangle Park, NC).</p>
<p class="art-para"><b>Reverse transcription and quantitative PCR (qRT-PCR) for cytokine analysis:</b> Total RNA was extracted from spleens using TRIzol (Invitrogen, Carlsbad, CA) as described by the manufacturer. Five micrograms of total RNA were treated with 1.0 unit of DNAse I and 1.0&#181;l of 10 x reaction buffer (Sigma, St. Louis, MO), incubated for 15 min at RT, 1.0 &#181;l of stop solution was added to inactivated DNase I, and the mixture heated at 70 &#176;C for 10 min. Total RNA was reverse transcribed using Superscript first-strand synthesis system (Invitrogen, Carlsbad, CA) according to manufacturer&#700;s recommendations.</p>
<div class="art-img" id="t001">
<img src="<?php echo $imgpath;?>images/mjcr-102-t001.gif" class="img-responsive center-block"/></div>
<p class="art-para">Primers for cytokines and GAPDH controls were based upon sequences from public databases (<a href="#t001">Table 1</a>). Amplification and detection used equivalent amounts of total RNA from spleens using the QuantiTect SYBR Green PCR kit (Qiagen, Valencia, CA).</p>
<p class="art-para"><b>QPCR data analysis:</b> Relative transcriptional levels of different genes were determined by subtracting the cycle threshold (Ct) of the sample by that of the GAPDH, the calibrator or internal control, as per the formula: &#916;Ct = Ct (sample)-Ct (calibrator). The relative expression levels of the specific gene in TP vaccinated chickens were compared to that in non-vaccinated chickens and calculated using the formula 2&#916;&#916;Ct where &#916;&#916;Ct =&#916;Ct (vaccinated)-&#916;Ct (non- vaccinated). Each analysis was performed in triplicate. Data were analyzed by analysis of variance (ANOVA) using SigmaStat statistical analysis software (Systat Software, San Jose, CA). Statistical significance was set at p&lt;0.05.</p>
<p class="art-subhead">Results</p>
<p class="art-para">Stable integration and expression of transgene in <i>A. thaliana</i>: Fifty -six (56) transgenic <i>A. thaliana</i> lines were selected. HA DNA was not detected in control plants transformed with pE1857 or untransformed plants. Chickens given TPs at high or low levels expressed HA protein, showed about 10- 20% reduced growth PC compared to chickens given the wild type <i>Arabidopsis</i> control plants or plants transformed with the pE1857.</p>
<p class="art-para">Determination of HA protein in plants: Western blotting showed 76 KD protein in 56 plants,but was absent in the untransformed plants(Datanotshown).The HAprotein expressed in <i>thaliana</i> lines ranged from 0.53%-0.61% of TSP (<a href="#t001">Table 1</a>). Transgenic line HA -1 had the highest HA expression. Higher levels of HA protein expression were consistent with higher copy number of the HAtransgene.</p>
<p class="art-para"><b>Challenge protection:</b> No clinical signs were observed in any group after challenge.</p>
<div class="art-img" id="f002">
<img src="<?php echo $imgpath;?>images/mjcr-102-f002.gif" class="img-responsive center-block"/></div>
<p class="art-para">Total AB titers are listed in <a href="#f002">figure 2</a>, the highest titers were in chickens vaccinated with commercial vaccine. Incontrast, chickens given plant-derived HAprotein showed a lower increase in titers. Chickens feed with either 50&#181;g or 100&#181;g had no significant differences in AB increase.</p>
<div class="art-img" id="f003">
<img src="<?php echo $imgpath;?>images/mjcr-102-f003.gif" class="img-responsive center-block"/></div>
<p class="art-para">HIs of the poly anti-sera were shown in <a href="#f003">figure 3</a>. Anti-H1 hemagglutinin was detected in groups feed either with 50 &#181;g or 100 &#181;g. HItiteralsohad little differences between the two groups, or group given the commercial vaccine.</p>
<p class="art-para">Cell mediated immune response-cytokine levels are shown in <a href="#f003">figure 4</a>. The subsets of Th cells were distinguished by the pattern of cytokines. To distinguish between the activation of Th cells of the Th1 and Th2 subsets, the expression levels of mRNA encoding a panel of chicken cytokines were quantified in spleen lymphocyte following vaccination. Compared with negative controls(group3&5), transcripts of the cytokines IL-2 in groups feed with 50 &#181;g and 100 &#181;g were increased 100-fold and 115-fold respectively after third week post vaccination, whereas commercial vaccine administered group increased 118-fold, which was a significant increase of the Th1 cytokine production. The increased Th2 cytokine IL-10 was not as obvious as Th1.IL-10 levels in groups given 50 &#181;g and 100 &#181;g were similar, increased 22-fold and 23-fold respectively, the group injected with commercial vaccine increased35-fold.</p>
<div class="art-img" id="f004">
<img src="<?php echo $imgpath;?>images/mjcr-102-f004.gif" class="img-responsive center-block"/></div><br/>
<div class="art-img" id="t002">
<img src="<?php echo $imgpath;?>images/mjcr-102-t002.gif" class="img-responsive center-block"/></div>
<p class="art-para">Virus shedding data are shown in <a href="#t002">table 2</a>. Consistent with a previous study, positive samples were defined as those yielding a two-well positive amplification with a Ct value of &#8804; 38. Groups given the TP showed shedding to be reduced 5 days post challenge(dpc) in both trachea and cloacal. Group2 birds had a greater effect in reducing virus shedding then group1, and has same effect as commercial vaccine group by 7 dpc. Chickens in group 2 feed with 100&#181;g TP had the best body weight gain (<a href="#f005">Fig.5</a>).</p>
<div class="art-img" id="f005">
<img src="<?php echo $imgpath;?>images/mjcr-102-f005.gif" class="img-responsive center-block"/></div>
<p class="art-subhead" id="discussion">Discussion</p>
<p class="art-para">Current edible vaccines have low expression and low efficacy. The TPVs have been studied for nearly thirty years, but few commercial applications have been reported. Data herein showed a significant concentration of HA protein expression in the TPV. This compared favorably with previous expression in A. thaliana of VP2 protein of infectious bursal disease virus and the sigma C protein of avian reovirus <a href="#23" id="ref23">[23]</a>, <a href="#24" id="ref24">[24]</a>. The HI assay is commonly used for the detection of antibodies to influenza viruses. However, for the detection of antibodies to avian influenza viruses of the H1N1 subtype either induced by infection or by vaccination, the HI assay isles sensitive. Therefore, VN assay is a more efficacious method of choice to detect serum antibodies directed to these viruses.</p>
<p class="art-para">Th1 cells produce IFN-&#947; and IL-2, which play a critical role in CMI. Th2 cells produce IL-4, IL-5, IL-10, and IL-13 <a href="#11" id="ref11">[11]</a>. Results showed high IL-2 expression, which suggested that the TH1 immune response may play a role in the efficacy of the TPV, as shown by reduced virus- shedding compared to the challenged birds, which received the commercial vaccine. Results showed that TPV induced a moderate anti-AIV HI AB response and reduced virus shedding in chickens when compared to chickens that received the commercial vaccine. The TPV also induced CMI related cytokines and has a potential for use in commercial AIV vaccines in poultry.</p>
<p class="art-subhead">Acknowledgment</p>
<p class="art-para">Research was supported by Minority Access to Research Careers (MARC) program awardedto Karyn Scissum-Gunn and also supported by a USDA-IFAFS grant (#:00-52100-9705). We are grateful to Teresa Dormitorio and Chia-Chen Weng for their technical help.</p>
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