Schmallenberg virus detection in Culicoides biting midges in Spain: First laboratory evidence for highly efficient infection of Culicoides of the Obsoletus complex and Culicoides imicola

Since Schmallenberg disease was discovered in 2011, the disease rapidly spread across Europe. Culicoides biting midges have been implicated as putative Schmallenberg vectors in Europe. The detection of Schmallenberg virus (SBV) in field collected Culicoides was evaluated through retrospective (2011-2012) collections and captures performed in 2013. This study represents the first detection of SBV in field collected Culicoides in Spain. Infectious midges were detected at the foothills of Pyrenees, Aramunt, in the summer 2012. All the specimens infected with Schmallenberg were of the species Culicoides obsoletus s.s. confirming its putative vector status in Spain. Experimental infection on field collected Culicoides provided evidence of atypical high efficiency for SBV vector infection and transmission potential in local populations of Culicoides imicola and in Culicoides of the Obsoletus complex. However, captured individuals of C. imicola were more susceptible to SBV infection than C. obsoletus s.l. (p < .001), with an infection ratio of 0.94 and 0.63, respectively. In contrast, a Culicoides nubeculosus colony appeared to be refractory to SBV infection.

Middle East respiratory syndrome coronavirus experimental transmission using a pig model

Dromedary camels are the main reservoir of Middle East respiratory syndrome coronavirus (MERS-CoV), but other livestock species (i.e., alpacas, llamas, and pigs) are also susceptible to infection with MERS-CoV. Animal-to-animal transmission in alpacas was reported, but evidence for transmission in other species has not been proved. This study explored pig-to-pig MERS-CoV transmission experimentally. Virus was present in nasal swabs of infected animals, and limited amounts of viral RNA, but no infectious virus were detected in the direct contact pigs. No virus was detected in the indirect contact group. Furthermore, direct and indirect contact pigs did not develop specific antibodies against MERS-CoV. Therefore, the role of pigs as reservoir is probably negligible, although it deserves further confirmation.

A robust PCR for the differentiation of potential virulent strains of Haemophilus parasuis

Background

Haemophilus parasuis is the etiological agent of Glässer’s disease in swine. H. parasuis comprises strains with heterogeneous virulence capacity, from non-virulent to highly virulent. Determination of the pathogenic potential of the strains is important for diagnosis and disease control. The virulence-associated trimeric autotransporters (vtaA) genes have been used to predict H. parasuis virulence by PCR amplification of their translocator domains. Here, we report a new and improved PCR designed to detect a different domain of the vtaA genes, the leader sequence (LS) as a diagnostic tool to predict virulence.

Methods

A collection of 360 H. parasuis strains was tested by PCR with LS specific primers. Results of the PCR were compared with the clinical origin of the strains and, for a subset of strains, with their phagocytosis and serum resistance using a Chi-square test.

Results

LS-PCR was specific to H. parasuis, and allowed the differential detection of the leader sequences found in clinical and non-clinical isolates. Significant correlation was observed between the results of the LS-PCR and the clinical origin (organ of isolation) of the strains, as well as with their phagocytosis and serum susceptibility, indicating that this PCR is a good predictor of the virulence of the strains. In addition, this new PCR showed a full correlation with the previously validated PCR based on the translocator domain. LS-PCR could be performed in a wide range of annealing temperatures without losing specificity.

Conclusion

This newly described PCR based on the leader sequence of the vtaA genes, LS-PCR, is a robust test for the prediction of the virulence potential of H. parasuis strains.

Distribution and genetic characterization of Enterovirus G and Sapelovirus A in six Spanish swine herds

The prevalence of Enterovirus G (EV-G) and Sapelovirus A (PSV-1) was investigated in Spanish swine herds by means of cross-sectional studies. Faecal samples from clinically healthy pigs were collected from six farms, and analysed by RT-PCR. The results indicated a high prevalence of EV-G detected in nearly all the animals older than 3 weeks of age. Otherwise, PSV-1 was only detected in 3-week-old piglets from one of the farms. Genetic analyses performed in the VP1 region of the EV-G indicated circulation of diverse strains in the same farm, related to genotypes G1, G2, G3, G4, G6, G9, G12, G13 and G14. Moreover, co-infection of several PSV-1 variants in the same animal was evident, typical of viral quasispecies. Evolutionary pressure analysis indicated that microevolution of PSV-1 seems to be driven by negative selection. This study gives further insights in the epidemiology of EV-G and PSV-1.

Exploratory study on the transcriptional profile of pigs subclinically infected with porcine circovirus type 2

The aim of this exploratory work was to use a microarray-based approach to study the global transcriptome profile of caesarean-derived, colostrum-deprived (CDCD) piglets experimentally infected with porcine circovirus type 2 (PCV2). PCV2-inoculated piglets developed a subclinical infection, as confirmed by serology, in situ hybridization and quantitative PCR. Total RNA from mesenteric lymph nodes and lungs was obtained by duplicate from 2 control and 2 PCV2-inoculated piglets and was hybridized to Affymetrix Porcine GeneChip. Among the 24,123 probesets studied, 25 and 33 were found to be significantly differentially expressed (DE) between control and PCV2 groups for mesenteric lymph node and lung, respectively. Most up-regulated genes in PCV2 group were closely related to the immune response, such as cytokines (CCL4L, CXCL9, CXCL11), MHC binding molecules (TCRalpha, CD8alpha), immunoglubulins (IgG) and T cell activation (LCK, KLRK1, RASSF2, GBP2). Quantitative real-time PCR was performed to verify the microarray results. Therefore, from a transcriptional point of view, PCV2-inoculated pigs were apparently able to activate a cell-mediated response and develop PCV2-specific antibodies, which probably led to a subclinical infection. The results from this study indicate that a microarray based approach is a helpful tool in order to better understand the pathogenesis of PCV2 infection.

Biochemical characterization of activation-associated bovine class I major histocompatibility complex antigens

Utilizing a 'sandwich' ELISA assay we have been able to demonstrate that mAb W6/32, B1G6 and IL-A19 are reactive with three different monomorphic determinants on bovine class I major histocompatibility complex (MHC) molecules. Sequential immunoprecipitations performed with the mAb revealed that class I molecules on PBM comprise a single population with respect to reactivity with the mAb in that the beta 2m-associated proteins bear all three epitopes. By contrast, TCGF-driven lymphoblasts and cells transformed by Theileria parva (Tp) additionally express molecules of Mr 45000 bound to beta 2m which are recognized by mAb B1G6 and IL-A19 but not by W6/32. These two subclasses of molecules were further distinguished on the basis that, when tunicamycin was added to cultures in the preparation of cells for analysis, mAb W6/32 precipitated class I heavy chains of Mr 39000 while the extra molecules detected only by mAb B1G6 and IL-A19 were of Mr 37000 and 39000. On thymocytes, the mAb W6/32-non-reactive class I molecules are present in low amounts and are expressed by cells in the medulla area, unlike BoT1 (analogous to human CD1) molecules which are expressed by the cortical cells. Our studies also revealed that the supposed beta 2m-specific mAb B1G6 does not recognize the beta 2m-associated molecules (BoT1) precipitated by mAb TH97A and thus the specificity of mAb B1G6 in cattle is for an epitope on bovine beta 2m which is strongly influenced by the nature of the heavy chain with which the beta 2m is associated.

[Emphysematous pyelonephritis: a case report]

Diabetic patients with urinary tract infections had a certain risk of developping emphysematous pyelonephritis with gas producting bacteria. This disease was accompagned with high mortalité. We will report one case who was treated successfully by high dose antibiotic regim and emergency nephrectomy.

Cowdria ruminantium antigens of around 15 kDa are potent inducers of IFN-gamma

Cellular responses induced in two Creole goats by vaccination with killed Cowdria ruminantium (Cowdria) were confirmed by IFN-gamma production and interleukin-2 receptor (IL-2R) expression. Both CD4+ and CD8+ but not WC1+ T cells showed a substantial increase in cell surface expression of IL-2R molecules in response to whole Cowdria lysate. Cowdria (Welgevonden strain) proteins were fractionated using continuous-flow electrophoresis and tested for their ability to induce IFN-gamma production by PBMC collected three weeks after the first inoculation and one week after the booster injection. Pooled fractions of around 15, 22, and 24 kDa were found to induce significant IFN-gamma production in both vaccinated animals on one of the two occasions. Antigens of around 15 kDa induced substantially higher IFN-gamma production than any other fractions in both animals. These pilot experiments pave the way towards the identification of proteins/genes that have potential for the development of a recombinant vaccine against heartwater.

IFN-gamma as an indicator of successful immunization of goats vaccinated with a killed Cowdria ruminantium vaccine

Cowdria ruminantium-induced production of IFN-gamma was measured by ELISA on a weekly basis during the course of vaccination with killed organisms emulsified in ISA50. Upon challenge, all (3/3) vaccinated animals that gave the lowest IFN-gamma response died of peracute cowdriosis. On the other hand, only one of three animals showing high IFN-gamma responses to vaccination died, but with a delay of 4 days in comparison with naïve controls. Thus, there seems to be a threshold level of IFN-gamma below which the probability for vaccinated animals to survive a lethal challenge is very low. During challenge, a much lower, but still physiologically meaningful production of IFN-gamma was detected using the 24-hour whole blood assay on day 5 after infection in animals controlling the infection. In contrast, IFN-gamma production was absent or negligible in naïve and vaccinated animals that died within 8-10 days after infection. Although these results need to be validated on a larger number of animals, they strongly suggest that IFN-gamma is a useful indicator of protective immunity in animals immunized with killed COWDRIA:

Ehrlichia ruminantium major antigenic protein gene (map1) variants are not geographically constrained and show no evidence of having evolved under positive selection pressure

In a search for tools to distinguish antigenic variants of Ehrlichia ruminantium, we sequenced the major antigenic protein genes (map1 genes) of 21 different isolates and found that the sequence polymorphisms were too great to permit the design of probes which could be used as markers for immunogenicity. Phylogenetic comparison of the 21 deduced MAP1 sequences plus another 9 sequences which had been previously published did not reveal any geographic clustering among the isolates. Maximum likelihood analysis of codon and amino acid changes over the phylogeny provided no statistical evidence that the gene is under positive selection pressure, suggesting that it may not be important for the evasion of host immune responses.

[Malignant non-Hodgkin's lymphoma presenting with cardiac tamponade]

Malignant non-Hodgkin's lymphoma rarely involves the heart. However, all cardiac structures may be invaded, although the myocardium and pericardium are affected more often than the valvular structures. Diagnosis is important because treatment must be adapted. The cardiac signs are usually non-specific and lymphomas presenting in this way have only occasionally been reported. The authors report two cases in which malignant non-Hodgkin's lymphoma presented with cardiac tamponade.

The use of the tetrazolium salt XTT for the estimation of biological activity of activated sludge cultivated under steady-state and transient regimes

The tetrazolium salt 3'-¿1-[(phenylamino)-carbonyl]-3, 4-tetrazolium¿-bis (4-methoxy-6-nitro) benzenesulfonic acid hydrate (XTT) was used as a tool for estimating the activity of the electron transport system (ETS) in activated sludge cultivated under steady-state and transient regimes in chemostat culture. Production of formazan by reduction of XTT depended on the initial concentration of the XTT following a saturation law and was proportional to live cell biomass. Addition of cyanide (KCN) to activated sludge gave an initial 1.5-fold increase in XTT reduction, while addition of 3,5-dichlorophenol (3,5-DCP) reduced this value drastically. At steady-state and transient regimes of an activated sludge chemostat, oxygen uptake rate (OUR) and XTT reduction rate were highly correlated and indicated significant variations depending on the growth conditions.

Bovine CD4+ T-cells lines reactive with soluble and membrane antigens of Cowdria ruminantium

Cowdria-specific CD4+ T-cell lines generated from immunised cattle respond to both soluble and membrane proteins of the agent. Furthermore, the lines produced the Cowdria-inhibitory cytokine IFN-gamma in response to soluble antigens fractionated by gel filtration and FPLC. Activity eluted as a single peak around fraction 15 for all T-cell lines tested. This fraction induced the highest production of IFN-gamma by the lines and was shown by SDS-polyacrylamide gel electrophoresis and silver staining analysis to contain less than 10 different bands ranging from 22 to 32 kDa. Given their high sensitivity and specificity, these short-term CD4+ T-cell lines will be valuable tools for the identification of Cowdria antigens for incorporation in a subunit vaccine.

Effect of isolation techniques, in vitro culture and IFNgamma treatment on the constitutive expression of MHC Class I and Class II molecules on goat neutrophils

Previous studies on the ability of human neutrophils to synthesize cytokines and express MHC Class I and inducible Class II molecules have suggested a possible role of these cells as accessory or antigen presenting cells (APC). There is no information available to date concerning this aspect in ruminants. Therefore, as the first step of these investigations, we have studied the cell surface expression of MHC molecules on goat neutrophils. We show that goat neutrophils can be distinguished from eosinophils with monoclonal antibody (MoAb) ILA-24 which recognizes cattle monocytes and neutrophils. Goat neutrophils constitutively express MHC Class II molecules. However, cell surface expression of MHC Class I and Class II molecules is dramatically reduced on neutrophils purified by density gradient centrifugation in comparison to neutrophils obtained from whole blood after lysis of erythrocytes. Also, the level of expression of MHC Class I antigens is seasonal and donor-dependent and rapidly decreases after in vitro culture despite negligible necrosis and apoptosis of neutrophils. Although treatment with IFNgamma partially prevents the loss of MHC Class I molecules on neutrophils, it fails to induce MHC Class II antigens. Implications of these results for further studies on the potential role of neutrophils as APC are discussed.

Immune responses to Cowdria ruminantium infections

Understanding the basis of protective immunity to Cowdria ruminantium will facilitate the development of an effective subunit vaccine against heartwater in ruminants and contribute to a better definition of protective immune mechanisms to obligate intracellular pathogens in general. Until recently, immunological studies of heartwater in ruminants concentrated solely on antibody responses. Since 1995, the mechanisms underlying cell-mediated immunity of heartwater have been analysed. Progress achieved in these areas is discussed here by Philippe Totté and colleagues, with special emphasis on ruminants, the natural hosts of C. ruminantium.

Characterization of 18 new BoLA-DRB3 alleles

The second exon of the bovine MHC class II DRB3 gene was amplified by polymerase chain reaction (PCR) from DNA samples of 568 zebu Brahman cattle (Bos indicus) from Martinique (French West Indies). Cloning of these PCR products allowed the isolation of both alleles from each animal, which were characterized by the PCR-restriction fragment length polymorphism (RFLP) technique using the restriction enzymes RsaI, BstYI and HaeIII. Four new PCR-RFLP patterns were obtained by digestion with RsaI. These patterns were named 'v', 'w', 'x' and 'y' continuing the accepted nomenclature. Sequencing of each allele allowed the identification of 18 new BoLA-DRB3 exon 2 nucleotide sequences and their deduced amino acid sequences.

Characterization of variable immunodominant antigens of Cowdria ruminantium by ELISA and immunoblots

Cross-immunization experiments have revealed a significant antigenic diversity of the isolate of Cowdria ruminantium which needs to be characterized for the development of vaccines. We identified polymorphic immunodominant antigens by ELISA and immunoblot. Using serum from a goat immune to the Gardel stock of Cowdria (isolated in Guadeloupe) adsorbed on antigen of the Senegal stock of this pathogen, distinct serogroups were revealed by ELISA among six isolates from different geographical origins. Furthermore, a goat serum directed against the Senegal stock and adsorbed on Gardel antigens was shown to be specific for the Senegal stock, thus confirming the existence of serotypes in Cowdria. The Major Antigenic Protein 1 (MAP1) of Cowdria was shown to have variable antigenic determinants. Also in a group of variable proteins ranging from 23 to 29 kDa, one antigen of 26-27 kDa had a determinant specific for the Gardel isolate. These polymorphic antigens may be relevant components of Cowdria ruminantium for a vaccine as the sera revealing these antigens originated from a goal surviving a lethal challenge. However, the presence of T-cell epitopes and the ability of the these antigens to confer protection to ruminants remain to be investigated. The production of a rabbit antiserum against this group of polypeptides will be of great use for their purification and for the screening of expression libraries.

Inhibitory effect of Cowdria ruminantium on the expression of MHC class I and class II molecules on bovine endothelial cells

Bovine endothelial cells constitutively express MHC class I molecules, whereas MHC class II molecules can be induced by interferon gamma (IFN gamma) treatment. Endothelial cells may play a role as antigen presenting cells (APC), but their role in the immune response against Cowdria ruminantium is unknown. We have studied the effect of C. ruminantium infection on the expression of MHC class I and class II molecules on the surface of bovine endothelial cells. Bovine brain endothelial cells (BBEC) from the microvasculature and bovine umbilical endothelial cells (BUEC) from the macrovasculature were cultured in vitro, infected with different concentration of Cowdria, and treated or not with IFN gamma. We observed that Cowdria induced a reduction of MHC molecules expression on the surface of BUEC and BBEC. This inhibitory effect of Cowdria on MHC molecules could affect the capacity of endothelial cells to act as efficient antigen-presenting cells.

Analysis of cellular responses to native and recombinant proteins of Cowdria ruminantium

The response of PBMC collected from cattle immunized with killed Cowdria to MAP1, MAP1-B, MAP2 and to a lysate of Cowdria was characterized in vitro. CD4+ T lymphocytes responded strongly to Cowdria lysates while B cells and gamma delta T cells proliferated in response to recombinant proteins. Short-term cell lines derived from PBMC using Cowdria lysates were more than 90% CD4+ and did not respond to any of the recombinant proteins. Restimulation of PBMC with MAP1, MAP1-B, and MAP2 proved difficult, and cultures usually stopped proliferating after 2 to 3 weeks. Only one cell line could be generated using MAP1 and it was composed of 85% gamma delta T cells. This study indicates that in animals immunized with killed Cowdria, proteins other than the serologically immunodominant MAP1 and MAP2 are strongly immunogenic for T lymphocytes.

Inhibition of MHC class I and class II cell surface expression on bovine endothelial cells upon infection with Cowdria ruminantium

Endothelial cells constitute a main target for Cowdria ruminantium (CR) and can potentially play a role as antigen presenting cells (APC). Therefore, we measured, in vitro, the effect of CR infections on the expression of MHC class I and class II molecules on bovine umbilical endothelial cells (BUEC) and on bovine brain endothelial cells (BBEC). A dramatic inhibition of the expression of IFNgamma induced MHC class II molecules was observed on BUEC and to a lesser extent on BBEC upon CR infection. This inhibitory effect was also observed on constitutively expressed MHC class I molecules. Part of the reduction of cell surface MHC molecules could be ascribed to their accumulation in intracellular compartments pinpointing a disruption in the transit of these molecules to the surface of the cells. The exact mechanisms of inhibition are not yet known but, as opposed to what is described in other models, the involvement of prostaglandin E2 can be excluded. The results obtained in this study show that endothelial cells have a decreased capacity to express both MHC class I and class II molecules on their surface upon CR infection, thus favouring the escape of this pathogen from the host immune system.

Detection of genomic polymorphisms among isolates of the intracellular bacterium Cowdria ruminantium by random amplified polymorphic DNA and Southern blotting

Sixteen primers were successfully used in a RAPD assay to generate reproducible fingerprints for six isolates of Cowdria ruminantium, a tick-transmitted rickettsia of ruminants. Distinction between stocks was possible by using one or at most two primers. Two stocks were very similar although originating from widely distant geographical regions. A genetic distance tree was constructed by analysing 108 fragments in pairwise comparison between stocks. Three amplification fragments probed with C. ruminantium genomic DNA determined a restriction fragment length polymorphism which allowed the distinction between stocks except for the two stocks that had similar RAPD patterns. The potential of RAPD to determine the extent of genetic diversity of C. ruminantium and to develop probes or PCR primers for diagnostic purposes is discussed.

Development of an in vitro cloning method for Cowdria ruminantium

Cowdria ruminantium is a tick-borne rickettsia which causes severe disease in ruminants. All studies with C. ruminantium reported so far were carried out with stocks consisting of infective blood collected from reacting animals or from the same stocks propagated in vitro. Cloned isolates are needed to conduct studies on immune response of the host, on genetic diversity of the parasite, and on mechanisms of attenuation and the development of vaccines. A method of cloning based on the particular chlamydia life cycle of Cowdria was developed. Instead of cloning extracellular elementary bodies, it appeared more convenient to clone endothelial cells infected by one morula resulting from the infection of the cell by one elementary body of Cowdria. Two hundred and sixteen clones were obtained by limiting dilution of infected cells. The method was experimentally validated by comparing randomly amplified polymorphic DNA fingerprints from individual clones obtained from endothelial cell cultures coinfected with two different stocks of C. ruminantium.

Analysis of T-cell responses in cattle immunized against heartwater by vaccination with killed elementary bodies of Cowdria ruminantium

Cattle were successfully immunized against heartwater with a lysate of Cowdria ruminantium formulated in Freund's adjuvant. Vaccinated animals proved fully resistant to virulent challenge 3 and 10 months after vaccination. For the first time a helper T lymphocyte response to Cowdria antigens was observed and characterized. Cowdria-specific T-cell lines generated from vaccinated animals by in vitro restimulation with Cowdria lysates are 95 to 100% CD4+, are MHC class II restricted, and produce gamma interferon. They proliferate in response to autologous monocytes infected with live Cowdria but not in response to uninfected monocytes. These T-cell lines will facilitate the search for Cowdria antigens that are immunogenic for T cells and will therefore be of relevance in the development of a subunit vaccine against the disease.

Comparative efficacy of Freund's and Montanide ISA50 adjuvants for the immunisation of goats against heartwater with inactivated Cowdria ruminantium

Two vaccines, based on inactivated elementary bodies of Cowdria ruminantium, one formulated in Montanide ISA50, the other in Freund's adjuvant, were compared in goats. Administered twice subcutaneously with an interval of 81 days, both protected three out of five goats against a very severe challenge, lethal for all 14 control goats, 3.5 months after the second injection. Both vaccines elicited similar antibody levels. The protection afforded by the Montanide ISA50 vaccine was tested 15 and 17 months after the second injection of the vaccine. Three out of six and five out of six goats, respectively, survived a challenge which killed all four control goats used on each occasion. Antibodies were still detectable in the immunised goats. The level of protection appears to be influenced by the dose of virulent C. ruminantium used for the challenge. As any stock of C. ruminantium can be incorporated in order to cover the antigenic repertoire of the organism, this kind of inactivated vaccine can now be tested in the field.

Contagious bovine pleuropneumonia vaccines: the current situation and the need for improvement

The control of contagious bovine pleuropneumonia (CBPP) has been clearly identified by the Organisation of African Unity/Inter-African Bureau of Animal Resources as a priority. In the first part of this article, the authors introduce the past and present vaccines, based on the two classic strains, T1, and KH3J. They describe the guidelines for vaccine production technology, and the quality control requirements for CBPP vaccines of the Office International des Epizooties. The failure of the currently used T1-SR vaccine to provoke satisfactory immunity in cattle, particularly in the newly infected areas of Africa, is pointed out. Other shortcomings of the current CBPP vaccines are also highlighted. Thus, there is a need to improve CBPP vaccines and the authors propose detailed emergency measures to address this problem. In the second part of the article, a subunit approach using immunostimulating complex technology is outlined. The authors emphasise the importance of current research in cell-mediated immunity and immunopathology, which is aimed at improving the efficacy of CBPP vaccines.

Recombinant bovine interferon gamma inhibits the growth of Cowdria ruminantium but fails to induce major histocompatibility complex class II following infection of endothelial cells

Recombinant bovine IFN gamma is a potent inhibitor of Cowdria ruminantium growth in vitro irrespective of the rickettsial stock, or the origin of the endothelial cells. These results suggest an important role for IFN gamma in protective immune responses against C. ruminantium infections. Here we also show that IFN gamma can induce the expression of MHC class II molecules on the surface of endothelial cells. However, treatment of endothelial cells with IFN gamma following infection with Cowdria fails to induce MHC class II expression. The implications of this pathogen-specific effect on class II expression by endothelial cells with regard to its recognition by the host immune system are discussed.

An amino acid sequence coded by the exon 2 of the BoLA DRB3 gene associated with a BoLA class I specificity constitutes a likely genetic marker of resistance to dermatophilosis in Brahman zebu cattle of Martinique (FWI)

One hundred and twenty-seven Brahman cattle from several locations in Martinique (FWI), reared under different environmental conditions, were followed over three years and checked for clinical signs of dermatophilosis. To confirm that these animals had been in contact with the pathogen Dermatophilus congolensis, their sera were tested by ELISA. On the basis of this epidemiological study, 12 animals were classified as resistant (seropositive without clinical signs), belonging to herds in which the prevalence of the disease ranged from 25 to nearly 98%. Eighteen animals classified as highly susceptible displayed severe characteristic skin lesions. These 30 selected animals were typed for class I antigens of the major histocompatibility complex (MHC). MHC class II genes were analyzed using the polymerase chain reaction (PCR) and restriction fragment length polymorphism (RFLP) techniques, on the exon 2 of the bovine leucocyte antigen (BoLA) DRB3 gene. Several alleles were found, according to patterns provided by the restriction enzymes used: Fnu 4HI, Dpn II, Hae III, and Rsa I. A particular sequence "EIAY" at amino acid positions 66/67/74/78 located in the antigen recognition sites (ARS) was found in the 12 animals classified as resistant, and 10 of them displayed also class I BoLA-A8 specificity. On the other hand, only 3 out of the 18 susceptible animals showed simultaneously the BoLA-DRB3 "EIAY" sequence and BoLA-A8 specificity. Interestingly, a serine residue at position 30 of the ARS was found in 8 of the susceptible animals and was completely absent from all resistant animals. Furthermore, in a same animal, the serine at position 30 and the EIAY sequence were never found simultaneously on the same haplotype. These results show a strong correlation between the resistant character to dermatophilosis and the association of MHC haplotypes: the BoLA-A8 specificity and the BoLA-DRB3 "EIAY" sequence at ARS positions 66/67/74/78 with the lack of serine in position 30. To confirm these results, family segregation studies are in progress and some interesting observations have been obtained.

Cross-talk between topoisomerase I and HU in Escherichia coli

In Escherichia coli about one half of the negative supercoiling of DNA is constrained by proteins, in contrast to the situation in eukaryotic cells where most of the DNA is constrained by histones. The level of supercoiling in the unrestrained portion is controlled by a balance between the supercoiling activity of gyrase and the relaxing activity of DNA topoisomerase I. In the present work we show, by disrupting one or both genes encoding the heterodimeric protein HU, that an interplay exists in bacteria between HU and topoisomerase I activity: a decrease in the intracellular concentration of HU was accompanied by an increase in relaxing activity as measured in cell extracts. Conversely, a topA10 mutant of topoisomerase I, which has low levels of relaxing activity, was unable to accept an HU deficiency introduced by transduction. Thus it appears that the ability to increase relaxing activity, or to decrease an excess of supercoiling, is important for cells to survive in the absence of HU. These data can be explained in terms of HU constraining supercoiling in vivo as it does in vitro: the absence of HU would generate more unconstrained supercoiling, which in turn would require an increase in relaxing activity to maintain physiological levels.

Histone-like protein HU and bacterial DNA topology: suppression of an HU deficiency by gyrase mutations

The abundant bacterial protein called HU has the ability to wrap and bend DNA in vitro, and thus it has long been thought to play a role in DNA supercoiling. In the absence of HU, Escherichia coli formed tiny colonies on agar, rapidly accumulated suppressor mutations, and was hypersensitive to novobiocin. Three types of evidence implicated gyrase in the suppression of an HU deficiency. First, spontaneous suppressors that restored normal growth and reduced sensitivity to novobiocin mapped in gyrB, one of the genes encoding DNA gyrase. Second, a pair of known gyrB mutations (gyrB-203 Ts gyrB-221 NovR) allowed normal growth at permissive (30 degrees C) but not at intermediate (37 degrees C) conditions. Third, introduction of a gyrB-expressing plasmid restored normal colony size. DNA supercoiling comparisons showed that chromosomal supercoiling decreased in the absence of HU and increased toward wild-type levels in the presence of a spontaneous gyrB suppressor. Taken together, these data establish that HU has a physiological role in chromosomal DNA topology, probably by facilitating the action of gyrase.

Infection of bovine brain microvessel endothelial cells with Cowdria ruminantium elicits IL-1 beta, -6, and -8 mRNA production and expression of an unusual MHC class II DQ alpha transcript

Cowdria ruminantium is a bacterial parasite that infects ruminants, causing an acute and often fatal disease. These obligate intracellular Gram-negative bacteria preferentially infect neutrophils and vascular endothelial cells, especially in the brain. The present study was performed with bovine brain microvessel endothelial cells in culture, infected by C. ruminantium in the presence or absence of IFN-gamma. Infection induced the production of IL-1 beta, -6, and -8 mRNAs, and this effect was potentiated by IFN-gamma. A semi-quantitative PCR analysis indicated that similar amounts of IL-1 beta and IL-6 mRNAs were produced in response to C. ruminantium infection and to treatment with 30 to 40 ng/ml LPS. In addition, although IFN-gamma induced the synthesis of an MHC class II DQ alpha transcript (1.3 kb), an unusual transcript (1.5 kb) was induced by infection and not after LPS treatment. Infection did not affect MHC class I, class II DQ beta, and invariant chain mRNA levels. The present results suggest that C. ruminantium infection raises the immune activity of brain endothelial cells in vitro and that only part of this response can be attributed to LPS. One can hypothesize that cerebral endothelium in vivo efficiently contributes, by MHC Ag expression and production of ILs, to the activation and/or recruitment of leukocytes to the brain and thus plays an active role in the pathogenesis of cowdriosis and in the immune response to this pathogen.