WO2011048248A1 - Adyuvante para vacunas, vacunas que lo comprenden y usos. - Google Patents
Adyuvante para vacunas, vacunas que lo comprenden y usos. Download PDFInfo
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- WO2011048248A1 WO2011048248A1 PCT/ES2010/070667 ES2010070667W WO2011048248A1 WO 2011048248 A1 WO2011048248 A1 WO 2011048248A1 ES 2010070667 W ES2010070667 W ES 2010070667W WO 2011048248 A1 WO2011048248 A1 WO 2011048248A1
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- ova
- adjuvant
- omp19s
- cells
- polypeptide
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K39/00—Medicinal preparations containing antigens or antibodies
- A61K39/39—Medicinal preparations containing antigens or antibodies characterised by the immunostimulating additives, e.g. chemical adjuvants
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
- A61P31/04—Antibacterial agents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P37/00—Drugs for immunological or allergic disorders
- A61P37/02—Immunomodulators
- A61P37/04—Immunostimulants
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/195—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria
- C07K14/23—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria from Brucella (G)
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K39/00—Medicinal preparations containing antigens or antibodies
- A61K2039/54—Medicinal preparations containing antigens or antibodies characterised by the route of administration
- A61K2039/541—Mucosal route
- A61K2039/542—Mucosal route oral/gastrointestinal
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K39/00—Medicinal preparations containing antigens or antibodies
- A61K2039/555—Medicinal preparations containing antigens or antibodies characterised by a specific combination antigen/adjuvant
- A61K2039/55511—Organic adjuvants
- A61K2039/55516—Proteins; Peptides
Definitions
- Adjuvant for vaccines vaccines that comprise it and uses.
- the present application relates to a vaccine adjuvant comprising a non-lipidated outer membrane polypeptide (Omp) of bacteria, wherein the bacteria may be of the Brucella genus.
- the adjuvant can be a modified polypeptide, it can be for example the Omp19S polypeptide or parts thereof, the Omp16S polypeptide or parts thereof, or mixtures thereof.
- the adjuvant is the non-lipidated polypeptide comprised in SEQ ID No. 1 or parts thereof.
- the adjuvant is the non-lipidated polypeptide comprised in SEQ ID No. 2 or parts thereof.
- Immunological adjuvants are substances that, incorporated into the antigen (Ag) or administered simultaneously with it, make the immune response against it more effective. They can be used to improve the immune response to an Ag in several ways: they can improve the magnitude of the immune response against a weak Ag; they can be used to increase the speed and duration of the immune response, they can modulate the avidity of antibodies (Acs), isotypes or subclass distribution; they can stimulate and modulate the cellular immune response; may promote the induction of local immune response (eg mucous membranes); decrease the amount of Ag needed and reduce the cost of a vaccine; or they can help prevent the competition of Ag that exists in the combined vaccines (Singh and O'Hagan. Advances in vaccine adjuvants. Nat Biotechnol. 17 (1 1): 1075-81. 1999).
- Optimal formulations must be safe, stable, biodegradable, inert, and low production costs.
- the list of substances that meet all these requirements is short, so far adjuvants approved for use in humans are restricted to aluminum salts, MF59 (an oil-in-water emulsion), MLP (monophosphoryl- glycolipid), viral particles (HBV and HPV), IRIV (proteoliposome composed of phospholipids, influenza virus hemagglutinin and a specific white antigen); and the subunit B of the cholera toxin (Reed, Bertholet, Coler and Friede.
- Adjuvants should not induce adverse reactions when used in prophylactic vaccines, although certain reactions are accepted in therapeutics. In the field of veterinary health, efficacy is an element of great importance and certain levels of side effects are tolerated (Sesardic. Regulatory considerations on new adjuvants and delivery systems. Vaccine. 24 Suppl 2 S2-86-7. 2006).
- CT cholera toxin
- the majority of adjuvants capable of inducing strong Th1 responses are those based on oily emulsions, such as the Incomplete Freund's adjuvant (IFA), however these bring about adverse reactions at the injection site, such as sterile abscesses and granulomas.
- IFA Incomplete Freund's adjuvant
- Omp16S and Omp19S Two new adjuvants are provided in the present invention: Omp16S and Omp19S. These substances increase and / or modulate the immune responses against the Ags with which they are co-administered, favoring the development of Th1 or Th17 or CTL immune responses.
- an adjuvant for vaccines comprising a non-lipidated outer membrane polypeptide (Omp) of bacteria
- the adjuvant can be a modified polypeptide or it can be for example the Omp19S polypeptide or parts thereof, or the Omp16S polypeptide or parts thereof, or mixtures thereof.
- the adjuvant is the non-lipidated polypeptide comprised in SEQ ID No. 1 or parts thereof.
- the adjuvant is the non-lipidated polypeptide comprised in SEQ ID No. 2 or parts thereof.
- a vaccine comprises as an adjuvant at least one non-lipidated outer membrane polypeptide (Omp) of bacteria and at least one antigen, wherein the bacterium can be of the Brucilla genus and where said vaccine can be mucosal or parenteral
- the vaccine adjuvant can be a modified polypeptide or it can be for example the Omp19S polypeptide or parts thereof, or the Omp16S polypeptide or parts thereof, or mixtures thereof.
- the adjuvant is the non-lipidated polypeptide comprised in SEQ ID No. 1 or parts thereof.
- the adjuvant is the non-lipidated polypeptide comprised in SEQ ID No. 2 or parts thereof.
- the use of the adjuvant to prepare a vaccine against a pathogen is provided, wherein the pathogen can have at least one phase of its intracellular life cycle.
- the use of the adjuvant to prepare an anti-tumor vaccine or an immunomodulatory composition is provided.
- Eukaryotic expression vectors comprising the sequences SEQ ID No. 1 or SEQ ID No. 2.
- Modified eukaryotic cells that express the sequences SEQ ID No. 1 or SEQ ID No. 2 are provided.
- Figure 1 shows: Coomasie Blue 15% polyacrylamide gel stained in purified and depleted Omp19S and Omp16S lipopolysaccharide (LPS). 20 g of total proteins were seeded on all streets. It was also run on the same Omp19S gel degraded with proteinase K (Omp19SPK) that was used as a control in some experiments.
- Omp19SPK proteinase K
- Figure 2 shows that expression of the ⁇ 4 ⁇ 7 marker increases in mesenteric lymph cells of BALB / c animals immunized orally with Omp19S as an adjuvant.
- the animals were immunized orally with: i) bovine ovalbumin (OVA), ii) Omp19S + OVA or iii) Choleric toxin (CT) + OVA.
- OVA ovalbumin
- CT Choleric toxin
- 2x10 6 mesenteric ganglion cells corresponding to each immunization group were labeled with anti-CD4 (FITC), anti-CD8 (PE-Cy5.5) and anti-a4p7 (PE) antibodies.
- FITC anti-CD4
- PE-Cy5.5 anti-a4p7
- the data are representative of two independent experiments.
- Figure 3 shows that Omp19S, when administered as an oral adjuvant, induces a T cell immune response in vivo.
- the delayed hypersensitivity reaction (DTH) was determined in response to the inoculation of 20 g OVA in the plantar pad of the immunized animals as described in Figure 2. The bars represent the average increase in the plantar skin fold between the right leg.
- FIG. 4 shows that Omp19S, when administered as an oral adjuvant, induces an increase in the proliferative capacity of splenocytes in response to the antigenic stimulus.
- the splenocytes of the immunized animals as described in Figure 2 were stimulated with OVA 1 OOpg / ml or without antigen.
- the cells were labeled with 3 H thymidine for 18 hours and the incorporated radioactivity was measured.
- results are shown as a stimulation index (Sl) representing the cpm of splenocytes stimulated with OVA / cpm of unstimulated splenocytes.
- Sl stimulation index
- a Sl> 2 is considered positive.
- the values represent the average of triplicate determinations for the 5 animals ⁇ SEM.
- FIG. 5 shows that Omp19S, when administered as an oral adjuvant, induces a cellular immune response with cytokine production (IFN- ⁇ and IL-17) in response to the antigen.
- Spleen splenocytes from each immunized group as described in Figure 2 (n / group 5) were stimulated in vitro with different concentrations of OVA (1 OOpg / ml and l OOOpg / ml) or complete medium (RPMI). The culture supernatants were collected 72 hours after stimulation.
- cytokines A) interferon (IFN) -y, (B) IL-4, (C) IL-2, (D) IL-10 and (E) IL-17 (pg / ml) in supernatants of culture were determined by ELISA. The values represent the average of determinations made in duplicate for each mouse ⁇ SEM. Representative of 2 experiments with similar results.
- Figure 6 shows that Omp19S when administered as an oral adjuvant, stimulates the induction of specific CD4 + and CD8 + T cells that produce IFN- ⁇ .
- Splenocytes from animals immunized orally with i) OVA, ii) Omp19S + OVA or iii) TC + OVA were stimulated with OVA 32 3 + A20J + OVA 500 g / ml or with complete culture medium (without stimulation) for 18hs. Then they were treated with Brefeldina A during the last 4 hours. of cultivation Subsequently, the cells were labeled with specific Acs anti-CD4 (PE / Cy5) and anti-CD8 (Alexa Fluor 647). They were then fixed, permeabilized and incubated with an anti-IFN- ⁇ Ac (PE) or isotype control (PE).
- PE anti-IFN- ⁇ Ac
- PE isotype control
- the numbers in the upper right quadrant represent the percentages of CD4 + (A) or CD8 + (B) T lymphocytes that express IFN- ⁇ . In all cases, the percentage of isotype control and IFN- ⁇ production of the same group without stimulation were subtracted, thus the percentage indicated corresponds to the production of specific IFN- ⁇ OVA. The data are representative of 2 independent experiments.
- Figure 7 shows that expression of the ⁇ 4 ⁇ 7 marker increases in mesenteric ganglion lymphocytes of BALB / c animals orally immunized with Omp16S as an adjuvant.
- BALB / c animals were immunized orally with: i) OVA, ii) Omp16S + OVA or iii) CT + OVA.
- 2x10 6 mesenteric ganglion cells corresponding to each immunization group were labeled with anti-CD8 (PE-Cy5.5) and anti-a4 7 (PE).
- the numbers in the upper right quadrant represent the percentages of CD8 + T cells that express the ⁇ 4 ⁇ 7 marker. In all cases the percentage of isotype control was subtracted.
- the data are representative of two independent experiments.
- FIG. 8 shows that Omp16S, when administered as an oral adjuvant, induces a T cell immune response in vivo.
- the DTH reaction was determined in response to the inoculation of 20 g OVA in the plantar pad of the animals immunized orally as in fig. 7.
- Figure 9 shows that Omp19S when administered as a nasal adjuvant induces a cellular immune response with cytokine production (IFN- ⁇ ) in response to the antigen.
- C57BL / 6 animals were immunized nasally with: i) OVA, ii) Omp19S + OVA or iii) CT + OVA.
- the concentrations of the cytokines (A) IFN- ⁇ , (B) IL-4 and (C) IL-10 (pg / ml) in the culture supernatants were determined by ELISA. The values represent the average of determinations made in duplicate for each mouse ⁇ SEM. Representative of 2 experiments with similar results.
- FIG 10 shows that Omp19S when administered as a nasal adjuvant, stimulates the induction of specific CD4 + and CD8 + T cells that produce IFN- ⁇ .
- the splenocytes of the immunized animals as described in Figure 9 were cultured with OVA2 57 + MO5 + OVA 500 g / ml or with complete medium (without stimulation, RPMI) for 18 hours. Then they were treated with Brefeldina A during the last 4 hours. of cultivation Subsequently, the cells were labeled with specific Acs anti-CD4 (PE / Cy5) and anti-CD8 (Alexa Fluor 647). They were then fixed, permeabilized and incubated with an anti-IFN- ⁇ Ac (PE).
- PE anti-IFN- ⁇ Ac
- the numbers in the upper right quadrant represent the percentages of CD4 + (A) or CD8 + (B) T lymphocytes that express IFN- ⁇ . In all cases, the percentage of isotype control and IFN- ⁇ production of the same group without stimulation were subtracted, thus the percentage indicated corresponds to the production of specific IFN- ⁇ OVA. The data are representative of 2 independent experiments.
- Figure 1 1 shows that Omp16S induces a cellular immune response with cytokine production when administered as a nasal adjuvant.
- Animals C57BL / 6 were immunized nasally with: i) OVA, ii) Omp16S + OVA or iii) CT + OVA.
- the concentrations of the cytokines (A) IFN- ⁇ , (B) IL-4 and (C) IL-10 (pg / ml) in the culture supernatants were determined by ELISA. The values represent the average of determinations made in duplicate for each mouse ⁇ SEM. Representative of 2 experiments with similar results.
- FIG 12 shows that Omp16S when administered as a nasal adjuvant, stimulates the induction of specific CD4 + and CD8 + T cells that produce IFN- ⁇ .
- the splenocytes of the immunized animals as described in fig. 1 1 were grown with OVA 2 57+ MO5 + OVA 500 g / ml for 18 hours. Then they were treated with Brefeldina A during the last 4 hours. of cultivation Subsequently, the cells were labeled with specific Acs anti-CD4 (PE / Cy5) and anti-CD8 (Alexa Fluor 647). They were then fixed, permeabilized and incubated with an anti-IFN- ⁇ (PE) Ac.
- PE anti-IFN- ⁇
- the numbers in the upper right quadrant represent the percentages of LT CD4 + (A) or CD8 + (B) that express IFN- ⁇ . In all cases, the percentage of isotype control and IFN- ⁇ production of the same group without stimulation were subtracted, thus the percentage indicated corresponds to the production of specific IFN- ⁇ OVA.
- the data are representative of 2 independent experiments.
- Figure 13 shows that the administration of Omp19S as a parenteral adjuvant has no effect on the magnitude of the humoral response.
- Total anti-OVA IgG titers were determined in the sera of BALB / c animals immunized subcutaneously with i) OVA, ii) OVA + Omp19S and iii) OVA + CFA and were determined by ELISA.
- FIG. 15 shows that Omp19S as a parenteral adjuvant does not induce local toxicity in the subcutaneous tissue of BALB / c mice after immunizations as described in fig. 13.
- a granuloma at the injection site (box) is observed in the mouse immunized with CFA as adjuvant (A).
- A On the right, the same area is observed in a mouse immunized with Omp19S as an adjuvant subcutaneously, with no signs of tissue alterations (B).
- FIG. 16 shows that Omp16S and Omp19S, when administered as parenteral adjuvants, induce a T cell immune response against the antigen in vivo.
- the DTH reaction was determined in response to the inoculation of 20 g OVA in the plantar pad of animals immunized subcutaneously with i) OVA, ii) OVA + Omp16S, iii) OVA + Omp19S or iv) OVA + CFA as described in fig. 13.
- the bars represent the average increase in plantar skin fold between the right and left leg ⁇ SEM at 48hs (A) and 72hs (B).
- n / group 5. Representative of 3 experiments with similar results.
- FIG 17 shows that Omp19S, when administered as an adjuvant parenterally, induces an increase in splenocyte proliferative capacity in response to Ag.
- Figure 18 shows that Omp19S when administered as a parenteral adjuvant induces a cellular immune response with cytokine production (IFN- ⁇ ) in response to the antigen.
- IFN- ⁇ cytokine production
- Figure 19 shows that Omp19S when administered as a parenteral adjuvant does not induce an increase in the production of IL-4 or IL-10 in response to the antigen.
- Figure 20 shows that Omp19S when administered as a parenteral adjuvant induces a cellular immune response with IL-17 production in response to the antigen.
- FIG 21 shows that the use of Omp19S as a parenteral adjuvant increases the proliferation of CD8 + cells specific for OVA2 57 - 264- Cells from OT-1 mice were labeled with carboxyfluorescein succinimidyl ester (CFSE) and transferred intravenously (iv) (10x10 6 cels / mouse) to C57BL / 6 mice.
- CFSE carboxyfluorescein succinimidyl ester
- iv 10x10 6 cels / mouse
- the proliferation of the CFSE + OT-1 cells in the spleens and lymph nodes was determined 5 days after immunization by flow cytometry analyzing CFSE fluorescence levels. The percentage of CD8 + cells that suffered more than one division is shown. Representative results of 3 experiments.
- FIG. 22 shows that the use of Omp19S as a parenteral adjuvant increases intracellular production of IFN- ⁇ in the population of CD8 + cells specific for OVA257-264.
- Splenocytes from the immunized animals as described in fig 22 were stimulated for 18 hours with: complete medium (RPMI), OVA 500Mg / ml + SIINFEKL peptide 5 pg / ml + MO5 and then treated with Brefeldin A for 6hs. Subsequently, the cells were labeled with an anti-CD8 Alexa Fluor antibody and anti-IFN- ⁇ PE.
- the upper right quadrant values represent the percentages of IF8- ⁇ producing CD8 + cells.
- Figure 23 shows that immunization with Omp16S or Omp19S as adjuvants induces a cytotoxic immune response capable of lysing tumor cells expressing Ag.
- the cytotoxic activity of the splenocytes of the C57BL / 6 mice immunized with: i) OVA, ii was determined.
- the white cells (MO5 expressing OVA or B16 that do not express OVA) labeled with 51 Cr were incubated with the splenocytes in a ratio of 50 splenocytes: 1 white cell.
- FIG. 24 shows that the percentage of CD4 + and CD8 + T cells expressing ⁇ 4 ⁇ 7 increases in mesenteric ganglia of BALB / c animals orally immunized with Omp19S as an adjuvant.
- the animals were immunized orally with: i) tetanus toxoid (TT), ii) TT + Omp19S or iii) TT + CT.
- 2x10 6 mesenteric ganglion cells corresponding to each immunization group were labeled with anti-CD4 (FITC), anti-CD8 (PE-Cy5.5) and anti-a4p7 (PE) antibodies.
- Figure 25 shows in gels that the Omp16S and Omp19S proteins are correctly expressed in eukaryotic cells transfected with the expression plasmids in eukaryotes pCI-Omp16S or pCI-Omp19S respectively.
- the expression of (A) Omp16S or (B) Omp19S in eukaryotic cells (COS-7) transiently transfected with plasmids pCI-Omp16S or pCI-Omp19S respectively or with plasmid pCI as a control was studied. After 24 or 48 hours of culture, the expression of Omp16 or Omp19 was evaluated by Western Blot in protein extracts from the transfected cells using specific anti-Omp16 or anti-Omp19 antibodies respectively.
- FIG 26 shows that Omp19S inhibits the stomach proteases of Balb / c mice.
- BSA irrelevant protein
- Omp19S mammalian protease inhibitor cocktail
- Enzymatic activity was measured using BODIPY FL casein or BODIPY FL OVA as substrates.
- the graph represents the percentage of enzyme activity remaining after each treatment calculated taking the maximum activity of the stomach extract supernatant on the BODIPY FL casein or BODIPY FL OVA substrate as appropriate.
- FIG. 27 shows that Omp19S is capable of inhibiting the degradation of eukaryotic (BSA, OVA) and bacterial (BLS, SurA. DnaK) antigens by stomach proteases of Balb / c mice.
- BSA eukaryotic
- BLS bacterial
- DnaK bacterial
- Each antigen was treated with: i) stomach extract supernatant, ii) stomach extract supernatant and Omp19S iii) stomach extract supernatant and mammalian protease inhibitor cocktail (as a control that stomach enzyme activity can be inhibited ).
- These reaction mixtures were subjected to a polyacrylamide gel electrophoresis with sodium dodecyl sulfate (SDS-PAGE) and subsequent staining with Coomasie blue.
- Figure 28 shows the ability of Omp19S to inhibit the degradation of antigens by stomach proteases in vivo using BODIPY FL casein as an antigen model.
- Balb / c mice were inoculated orally with: i) NaHCO3 buffer (1 M, pH8) (Vehicle), ii) BODIPY FL casein with Omp19S, ii) BODIPY FL casein with aprotinin (a known protease inhibitor), iii) BODIPY FL casein.
- the graph represents the percentage of enzyme activity remaining after each treatment calculated taking as maximum activity that of the stomach extract supernatant of mice immunized with BODIPY FL casein.
- Omp19S polypeptide For the purposes of the present application the phrases "Omp19S polypeptide”, “Omp19S protein” and “Omp19S” have the same meaning and correspond to the non-lipidated Omp19S peptide.
- Omp19S or Omp16S refers to the polypeptide whose sequence may correspond to SEQ No. 1 or SEQ No. 2 respectively obtained by purification from cells, tissues or organisms that express it, or by chemical synthesis.
- Omp16S polypeptide “Omp16S protein” and Omp16S”
- Omp16S “have the same meaning and correspond to the non-lipidated Omp16S peptide.
- immunogen and "antigen” have the same meaning and are defined as any substance against which, in an immunocompetent organism, a humoral or cellular immune response can be induced. In this sense, antigen is synonymous with immunogen.
- the Omp19S polypeptide was cloned without the consensus sequence of lipidation in a plasmid vector. From this construction competent E. coli cells were transformed so as to express and purify the non-lipidated polypeptide. Purification was carried out using a nickel-agarose resin. The corresponding eluates were seeded on a polyacrylamide gel with SDS ( Figure 1). Then the elutes of similar concentration were combined in different fractions. In these fractions the identity of the purified polypeptide was corroborated, for this a Western Blot was performed using a monoclonal antibody against Omp19.
- the cloned polypeptide was sequenced and its sequence is shown in SEQ ID No. 1. It is evident that variations of said sequence may exist, all of which are within the scope of the present invention. For example fragments thereof, or additions, or deletions of fragments or amino acids.
- Non-lipidated Omp19S polypeptides obtained from any Brucella species fall within the scope of the present invention.
- the Omp16S polypeptide was cloned without the consensus sequence of lipidation in a plasmid vector. From this construction competent E. coli cells were transformed so as to express and purify the non-lipidated polypeptide. Purification was carried out using a nickel-agarose resin.
- the delayed hypersensitivity response is mediated by T cells that arrive at the site of the antigen injection, recognize peptides derived from that antigen in Ag presenting cells (APCs) and release cytokines such as IFN- ⁇ , which stimulates Recruitment of innate immunity cells causing edema and swelling. Then, to analyze the T response in vivo, the DTH response induced by the injection of OVA was evaluated in mice immunized orally with the adjuvants of the invention. To do this 20 g of OVA was injected into the plantar pad in one of the legs of the immunized mice and in the other physiological solution was injected as a control.
- APCs Ag presenting cells
- Omp19S as a mucosal adjuvant would induce an antigen antigen (OVA) T response in vivo.
- OVA antigen antigen
- splenocytes from the immunized mice were cultured in the presence of different concentrations of OVA or complete medium for 72 hours. and then the pattern of cytokines produced in the supernatants of these cells was analyzed.
- a capture ELISA was performed using specific monoclonal antibodies for the detection of IFN- ⁇ , IL-2, IL-10, IL-4 and IL-17 in culture supernatants of stimulated and control splenocytes.
- Th2 profile cytokine levels such as IL-4 and IL-10 were found to be similar to baseline levels. In this way the use of Omp19S as an oral adjuvant would generate a response of type Th1 and Th17.
- FIG. 6 shows the IFN- ⁇ production in CD4 + T cells by groups of mice immunized with OVA, OVA + Omp19S and OVA + CT orally.
- Omp19S as an oral adjuvant, induces i) the migration of CD4 + and CD8 + T cells to the gastrointestinal mucosa, ii) a specific antigen T cell response in vivo, iii) the release of Th1 cytokines, Th17 as well as the proliferation of lymphocytes in response to Ag and iv) CD4 + and CD8 + T lymphocytes producing IFN- ⁇ memory.
- IFN- ⁇ producing cells are indispensable in generating efficient immune responses against pathogen infections with some phase of their intracellular life cycle such as viruses, bacteria, parasites and fungi; or tumors, the fact that the adjuvant induces the production of this cytokine by T lymphocytes could be beneficial for the development of vaccines against such diseases. All these are very required qualities in the field of mucosal adjuvants.
- the expression of ⁇ 4 ⁇ 7 in CD4 + and CD8 + T lymphocytes from mesenteric nodes obtained from animals immunized orally with i) OVA, ii) OVA + Omp16S or iii) OVA + CT was also studied (Figure 7).
- the delayed hypersensitivity response induced by OVA injection was evaluated in mice immunized orally.
- Those animals immunized orally with OVA co-administered with Omp16S as an adjuvant presented an increase in plantar skinfold with respect to those animals immunized with OVA without adjuvant at 48 hours and at 72 hours post-immunization of OVA ( Figure 8 A and B ).
- This increase was slightly greater than that induced by cholera toxin as an adjuvant administered by the same route at 48 hours ( Figure 8 A and B).
- Omp16S as a mucosal adjuvant induces a delayed hypersensitivity response (DTH) anti-antigen (OVA).
- DTH delayed hypersensitivity response
- OVA delayed hypersensitivity response
- Omp16S administered orally is capable of inducing a T cell response in vivo similar to that generated with an experimental mucosal adjuvant known as choleric toxin.
- Omp16S as an oral adjuvant would induce i) the migration of CD8 + T lymphocytes to the gastrointestinal mucosa, ii) a specific antigen T cell response in vivo.
- Omp19S The nasal administration of Omp19S generates the production of specific cytokines for OVA in spleen splenocyte cultures.
- Splenocytes from animals immunized nasally with OVA + Omp19S produced higher levels of IFN- ⁇ with respect to animals immunized with OVA without adjuvant (Figure 9A) in response to the OVA antigen.
- OVA + CT administration by nasal route induced higher levels of IFN- ⁇ in the culture supernatants of splenocytes stimulated with OVA.
- OVA stimulation did not induce the secretion of IL-4 in the splenocytes of any of the groups studied ( Figure 9B).
- mice immunized with Omp19S + OVA by nasal route showed an increase in the percentage of CD4 + T cells but mostly CD8 + T cells that produce anti-OVA IFN- ⁇ . This production was greater than the OVA control group immunized by the same route without adjuvant and even greater than the control group with an adjuvant known as cholera toxin.
- Omp16S nasal coadministration induces cytokine production in response to Ag in spleen splenocyte cultures.
- the results indicate that splenocytes from animals immunized nasally with OVA + Omp16S produced higher levels of IFN- ⁇ with respect to control animals (OVA) in response to the OVA antigen (Figure 1 1 A).
- Coadministration of nasal CT induced lower levels of IFN- ⁇ in the culture supernatants of splenocytes stimulated with OVA compared to the group immunized with OVA + Omp16S.
- OVA stimulation did not induce the secretion of IL-4 in the splenocytes of any of the groups studied in response to the antigen (Figure 1 1 B).
- Omp19S and Omp16S as nasal adjuvants, induces i) the release of Th1 cytokines in response to the antigen and ii) induces specific CD4 + and CD8 + T lymphocytes producing IFN- ⁇ specific antigen.
- IFN- ⁇ producing T cells are indispensable in generating efficient immune responses against pathogen infections with some phase of their intracellular life cycle (or when the pathogen is internalized by macrophages), such as viruses, bacteria, parasites and fungi ; or tumors, the fact that the adjuvants of the invention induce the production of this cytokine by T lymphocytes could be beneficial for the development of vaccines against such diseases.
- the humoral response was studied by determining the titer of total IgG immunoglobulins and the profile of induced isotypes (lgG1 and lgG2a) against OVA when co-immunized with Omp19S compared to the immunization of OVA in SF or OVA in CFA. From an indirect ELISA, the total IgG titers in the sera of the animals obtained 3 weeks after the last immunization in the different groups were determined. In the results obtained there is no significant increase in specific antibodies with respect to immunization with OVA without adjuvant (Figure 13), which would indicate that Omp19S does not have an effect on the magnitude of the triggered humoral response. Whereas, immunization with the Freund Adjuvant Positive Complete Control (CFA) generates an increase in the production of specific antibodies as expected. Omp19S as an adjuvant has no effect on the magnitude of the humoral response.
- CFA Freund Adjuvant Positive Complete Control
- the CFA has a mechanism of action type deposit, insolubilizing the antigen at the injection site, which promotes the accumulation of macrophages together with other cells, which form the characteristic macrophage granulomas showing signs of toxicity.
- the preparation of Omp19S with which immunizations are performed is soluble, so it does not cause the formation of granulomas, which suggests a mechanism of adjuvant action different from that of CFA. Immunization with Omp19S as an adjuvant does not generate adverse local reactions in the subcutaneous tissue.
- mice immunized subcutaneously were evaluated with: i) OVA, ii) OVA + Omp19S, iii) OVA + Omp16S, iv) OVA + CFA ov) physiological solution (SF) induced DTH response by the injection of OVA.
- OVA physiological solution
- 20 g of OVA was injected into the plantar pad in one of the legs of the immunized mice and in the other SF was injected as a control.
- Those animals immunized with OVA co-injected with Omp19S or Omp16S showed an increase in the plantar skin fold compared to those animals immunized with OVA without adjuvant at 48hs. and 72 hours.
- splenocytes from the immunized mice were cultured in the presence of different concentrations of OVA or complete medium for 72 hours. and then the pattern of cytokines produced in the supernatants of these cells was analyzed.
- a capture ELISA was performed using specific monoclonal antibodies for the detection of IFN- ⁇ , IL-10, IL-4 and IL-17 in culture supernatants of stimulated and control splenocytes.
- the cytokine pattern presented suggests that the response triggered by immunization with Omp19S as an adjuvant corresponds to a Th1 profile, in which there is an increase in the production of IFN- ⁇ and not IL- 4 and IL-10.
- IFN- ⁇ producing T cells are indispensable in generating efficient immune responses against pathogen infections with some phase of their intracellular life cycle (or when the pathogen is internalized by macrophages), such as viruses, bacteria, parasites and fungi ; or tumors, the fact that the adjuvant induces the production of this cytokine by T lymphocytes could be beneficial for the development of vaccines against such diseases. Since the adjuvants of the invention induce Th1 responses could be used in vaccine preparations against such pathogens.
- Transgenic mice for the T receptor have been used experimentally as a source of T cells with a defined specificity.
- One of the most widely used models is transgenic OT-1 mice, whose CD8 + T cells express the specific T receptor for the OVA SIINFEKL peptide presented in the context of MHC I (H-2K b ) costimulatory molecules (Harmala, Ingulli , Curtsinger, Lucido, Schmidt, Weigel, Blazar, Mescher and Pennell.
- MHC I H-2K b
- mice were used for in vivo analysis of the adaptive immune response T CD8 + against the antigen.
- the group immunized with SF had a proliferation value of 21.79%, while in the group immunized with OVA without adjuvant the The percentage of cells that divided (75.01%) was lower than when inoculated with Omp19S as an adjuvant (86.44%). The same happened with the cells of the draining lymph nodes.
- the animals were immunized with said degraded adjuvant. It was observed that immunization with the proteinase K degraded adjuvant induced proliferation levels comparable to those of OVA inoculation without adjuvant.
- the OT-1 cells of the animals immunized with the positive control (LPS) showed proliferation levels comparable to those of the group immunized with Omp19S as an adjuvant.
- CD8 + cells were capable of inducing significant levels of IFN- ⁇ , characteristic of a T-helper type 1 response.
- C57BL / 6 mice were immunized with: i) OVA ii) OVA + Omp19S, or iii) OVA + Omp19S PK sc sc Seven days later the spleens were removed from the animals, then the splenocytes were stimulated with culture medium, OVA 500 g / ml + SIINFEKL Peptide 5 g / ml + APC MO5 or Pma-lonomycin and the production of intracellular IFN- ⁇ was measured by flow cytometry.
- the population of IFN- ⁇ -producing CD8 + cells is higher in mice immunized using Omp19S as an OVA adjuvant (0.73%) before in vitro stimulation with OVA compared to cells from animals immunized with OVA alone, whose percentage (0.14%) is similar to the isotype, this indicates that the polypeptide used as an adjuvant induces the differentiation of CD8 + T cells capable of producing IFN- ⁇ in response to stimulation with the antigen ( Figure 22).
- Omp19S is capable of inducing the production of CD8 + T lymphocytes that secrete IFN- ⁇ in response to the antigen.
- IF8- ⁇ -producing CD8 + cells are indispensable in generating efficient immune responses against pathogen infections with some phase of their intracellular life cycle such as viruses, bacteria, parasites and fungi; or tumors, the fact that the adjuvant induces the production of this cytokine by T lymphocytes could be beneficial for the development of vaccines against such diseases.
- splenocytes from animals immunized with Omp19S or Omp16S as adjuvants produced a higher percentage of lysis with respect to those cells from the group immunized with OVA without adjuvant.
- the complete Freund's adjuvant (CFA) was used as a positive control.
- CFA complete Freund's adjuvant
- Omp19S and Omp16S as adjuvants induce a cytotoxic response in the splenocytes of the immunized mice greater than that induced by the CFA adjuvant and without signs of alterations in the immunized tissue or other adverse effects.
- the Omp19S and Omp16S polypeptides have been shown to be vaccine formulations comprising any immunogen or antigen whose adjuvant is at least Omp19S and / or Omp16S.
- the polypeptides of the invention are good adjuvants for the generation of Th1 and cytotoxic responses in mucous membranes through nasal and oral use and systemically after parenteral administration.
- T immune responses are considered protective against pathogens and tumors.
- These adjuvants induce IFN- ⁇ -producing T responses administered parenterally and mucosally (nasal and oral) so they could be useful in vaccine preparations against pathogen infections with some phase of their intracellular life cycle (or when the pathogen is internalized by macrophages) such as viruses, bacteria, parasites and fungi; or tumors They also induce cytotoxicity against a tumor line that expresses the antigen (MO5), so they could be used in vaccines against tumors.
- MO5 antigen
- anti-allergic vaccines are intended to induce Th1 responses against the allergen in order to redirect an allergen-specific Th2 response to a modulatory Th1.
- the adjuvants of the invention may be useful in modulating the allergen response.
- IL-17 has an important role in the protection against Streptococcus pneumonie and Mycobacterium tuberculosis.
- the proposed mechanism for the efficacy of vaccines that induce the activation of Th17 cells is through the regulation of chemokines. In this sense, the use of an adjuvant that is capable of inducing the production of this cytokine would be beneficial in vaccines against this type of pathogen.
- the adjuvants of the invention could be used as immunomodulators or activators of the immune response in different pathologies where the immune response is involved.
- the adjuvant polypeptides Omp16S and Omp19S could also be expressed in situ, being administered as vectors to DNA or RNA.
- the Omp16 and Omp19 proteins are correctly expressed after transfection of eukaryotic cells with plasmids pCI-Omp16S or pCI-Omp19S respectively.
- expression vectors can be administered to eukaryotic cells or higher organisms (vertebrates or mammals) in such a way that the adjuvant is expressed in situ and exerts its effect.
- the action of the adjuvants of the present invention further comprises an inhibitory mencanism of the action of proteases, which would lead to an increase in the half-life of the antigen (Figure 26).
- Each antigen was treated with: i) stomach extract supernatant, ii) stomach extract supernatant and Omp19S, iii) stomach extract supernatant and mammalian protease inhibitor cocktail (as a control that stomach enzyme activity can be inhibited)
- stomach extract supernatant and mammalian protease inhibitor cocktail as a control that stomach enzyme activity can be inhibited
- These reaction mixtures were subjected to a polyacrylamide gel electrophoresis with sodium dodecyl sulfate (SDS-PAGE) and subsequent staining with Coomasie blue (Figure 27).
- mice were inoculated orally with: i) NaHCO3 buffer (1 M, pH8) (Vehicle), ii) BODIPY FL casein with Omp19S, iii) BODIPY FL casein with aprotinin (a known protease inhibitor), iv) BODIPY FL casein. After a reaction time the mice were sacrificed and the extracts were analyzed by fluorescence emission, observing an inhibition of the degradation of antigens by stomach proteases in vivo ( Figure 28).
- proteases that are inhibited by the action of the adjuvants of the present invention are serine proteases, aspartyl proteases, metalloproteases and cysteine proteases.
- the adjuvant polypeptides of the present invention turn out to be ideal since said ability to inhibit the destruction of Ag by proteases increased their half-life and induces an immune response. This could mean that a smaller amount of Ag is required to induce the same immune response, which would reduce vaccine costs.
- Omp16S and Omp19S act as highly efficient adjuvants for antigens unrelated to Brucella antigens.
- Example 1 Cloning, expression and characterization of the Omp19S v Omp16S polypeptides of Brucella abortus
- the Omp19S polypeptide was cloned without the consensus lipidation sequence in the pET22 + vector with the addition of a histidine tail at the terminal carboxyl end (Novagen, Madison, Wl, USA), as described in (Giambartolomei, Zwerdling, Cassataro, Bruno , Fossati and Philipp.
- Lipoproteins, not lipopolysaccharide, are the key mediators of the proinflammatory response elicited by heat-killed Brucella abortus. J Immunol. 173 (7): 4635-42. 2004).
- Antisense 5'AAACTCGAGGCGCGACAGCGTCAC3 '(SEQ ID N ° 4)
- the genomic DNA of B. abortus 544 was used as tempering in the PCR reaction.
- the ligation reaction product was used to transform competent bacteria of strain JM109 and the plasmid DNA was purified with a commercial kit (Promega).
- the Omp16S polypeptide was cloned without the consensus sequence of lipidation in the pET22 + vector with the addition of a histidine tail at the carboxyl terminal (Novagen, Madison, Wl, USA), as described in (Giambartolomei et al. Lipoproteins, not lipopolysaccharide, are the key mediators of the proinflammatory response elicited by heat-killed Brucella abortus. J Immunol. 173 (7): 4635-42. 2004).
- oligonucleotides were designed containing the restriction sites for the Ndel and Xhol enzymes at the 5 'end, and 3' region of the Omp16 gene without the aminoterminal end corresponding to the signal peptide sequence and the aminoterminal cysteine:
- the genomic DNA of B. abortus 544 was used as tempering.
- the product of the ligation reaction was used to transform competent bacteria of strain JM109 and the plasmid DNA was purified with a commercial kit (Promega).
- the non-lipidated polypeptides Omp19S and Omp16S were subjected to a polyacrylamide gel electrophoresis with sodium dodecyl sulfate (SDS-PAGE), followed by a Coomasie blue staining to monitor the different stages of purification. Their identity was confirmed by Western Blot using a monoclonal antibody anti-Omp19 and another anti-Omp16.
- the concentration of Omp19S and Omp16S was evaluated by the bicinconinic acid method (Pierce, Rockford, IL) using bovine serum albumin (BSA) as standard.
- BSA bovine serum albumin
- Example 2 Immunization assays of animals using Omp19S v Omp16S as an adjuvant:
- OVA ovalbumin
- mice 6 to 8 weeks old of the strain Balb / c (H-2 d ) or strain C57BL / 6 (H-2 b ) were used. They were acquired in the bioterio of the National University of La Plata and were maintained in the bioterio of the Institute of Humoral Immunity Studies (IDEHU). They received water and food ad libitum.
- Routine 1 Two protocols were followed for oral immunization, in which the injection routine of the different groups of mice was varied. The two immunization routines tested gave similar results. Routine 1
- mice were immunized orally six times on days 0, 7, 8, 14, 15 and 21 with i) ⁇ ⁇ of OVA, ii) ⁇ ⁇ of OVA + ⁇ ⁇ of Omp19S, iii) ⁇ ⁇ of OVA + ⁇ ⁇ of Omp16S, iv) ⁇ ⁇ of OVA + 10 ⁇ g of cholera toxin (CT, Sigma) embedded in a NaHCO3 buffer (1 M, pH8). Two weeks after (day 35) of the last immunization the mice were sacrificed to evaluate the cellular response.
- CT cholera toxin
- Balb / c animals were immunized orally six times on days 1, 2, 3, 8, 9 and 10 with i) ⁇ ⁇ of OVA, ii) ⁇ ⁇ of OVA + ⁇ 50 ⁇ g of Omp19S, iii) ⁇ ⁇ of OVA + ⁇ 50 ⁇ g of Omp16S, iv) ⁇ ⁇ of OVA + 5 ⁇ g of cholera toxin (TC, Sigma) embedded in a NaHCO 3 buffer (1 M, pH8).
- DTH delayed hypersensitivity response
- C57BL / 6 animals were immunized nasally three times every 7 days with i) 50 ⁇ of OVA, ii) 50 ⁇ of OVA + ⁇ 0 ⁇ g of Omp19S, iii) 50 ⁇ of OVA + ⁇ 0 ⁇ g of Omp16S, iv) 50 ⁇ g of OVA + 1 ⁇ of cholera toxin (TC, Sigma). 12.5 ⁇ were injected through the nostril. Three weeks after the last immunization the animals were sacrificed to evaluate the cellular response.
- TC cholera toxin
- the animals were bled retroorbitally and the sera were stored at -20 ° C for the detection of specific Acs.
- the animals were immunized subcutaneously (sc) three times every 7 days with i) KX ⁇ g of OVA, ii) KX ⁇ g of OVA + KX ⁇ g of Omp19S, iii) KX ⁇ g of OVA + 100 ⁇ of CFA ( Sigma-Aldrich) or iv) SF.
- the animals were bled to obtain the sera, some (5 per group) were sacrificed to evaluate the cellular response and others underwent DTH (5 per group).
- DTH Delayed Hypersensitivity Response
- mice Seven days after the last immunization the animals were inoculated intradermally in the right plantar pad with 20 g of OVA and with physiological solution (SF) in the left plantar pad.
- the response was evaluated by measuring the increase in the right plantar cutaneous fold with respect to the left, using a digital caliper of 0.01 mm accuracy at 48 hours and 72 hours after inoculation.
- mice Obtaining splenocytes from mice:
- mice anesthetized with ether bled white through the retroorbital plexus and were sacrificed by cervical dislocation. An appropriate incision was made, opening the peritoneal cavity, to expose the spleen, which was extracted with tweezers and scissors in aseptic conditions. The spleen was crushed into small fragments using a curved tip scissor. 3 ml of RPMI 1640 (Gibco) was added and homogenized. The suspension was taken at 8 ml and filtered on steel mesh to retain cell debris and tissue debris.
- RPMI 1640 A wash was then performed with RPMI 1640, and the cells were resuspended in complete culture medium (RPMI 1640 with the addition of 10% fetal bovine serum (SFB, Gibco), 2mM L-glutamine and pyruvate, 25 mM HEPES , 100 U / ml of penicillin and 100 ⁇ g ml of streptomycin).
- lymphocytes from mesenteric ganglia of mice Obtaining lymphocytes from mesenteric ganglia of mice:
- mice anesthetized with ether bled white through the retroorbital plexus and were sacrificed by cervical dislocation. An appropriate incision was made, opening the peritoneal cavity, to expose the mesenteric ganglia, which were removed with tweezers and scissors under aseptic conditions. They were then incubated with collagenase (2.5mg / ml) for 30 minutes. The collagenase was then removed and the nodes were crushed into small fragments using a curved tip scissors. 3 ml of RPMI 1640 (Gibco) was added and homogenized. The suspension was taken at 8 ml and filtered on steel mesh to retain cell debris and tissue debris.
- collagenase 2.5mg / ml
- RPMI 1640 A wash was then performed with RPMI 1640, and the cells were resuspended in complete culture medium (RPMI 1640 with the addition of 10% fetal bovine serum (SFB, Gibco), 2mM L-glutamine and pyruvate, 25 mM HEPES , 100 U / ml of penicillin and 100 ⁇ g ml of streptomycin).
- Trypan Blue exclusion method was used. A solution of Trypan Blue 0.2% in PBS was prepared. 50 ⁇ of the suspension to be counted was taken and 50 ⁇ of Trypan Blue was added. It was loaded into a Neubauer chamber and the number of viable cells was determined under an optical microscope.
- Splenocytes (4 x 6 6 cells / ml) of mice immunized in the presence of OVA (100 and 1000 g / mi), complete medium, or control mitogen (Concanavalin A, 5 g / mi) were cultured in 48-well plates. The cultures were made in an oven at 37 ° C in an atmosphere of 5% CO 2 for 72 hours for Balb / c mice and 5 days for C57BL / 6. The supernatants of these cells were used to determine cytokines secreted by ELISA. . Capture ELISA for cytokine detection:
- a capture ELISA was performed using specific monoclonal Acs for the detection of IFN- ⁇ , IL-2, IL-10, IL-4 (OptEIA TM, PharMingen, San Diego, USA) and IL-17 (Mouse IL-17 Quantikine , R&D Systems, Inc., Minneapolis, USA) in culture supernatants of stimulated splenocytes and control.
- the protocol was performed according to the manufacturer's instructions.
- the splenocytes of the immunized mice (2x10 5 cells / ml) were cultured in triplicate in the presence of OVA (100 and 1000 g / mi), complete medium or control mitogen (Concanavalin A, 5 g / mi) in 96-well plates.
- OVA 100 and 1000 g / mi
- complete medium or control mitogen Concanavalin A, 5 g / mi
- the cultures were carried out in an oven at 37 ° C in an atmosphere of 5% CO2. At 5 days they were given a pulse of tritiated thymidine (1 Ci / well) and 18 hours.
- the cells were then harvested and the incorporation of radioactive thymidine was measured with a beta counter expressed in counts per minute.
- the results were expressed in SI stimulation index (cpmOVA / cpmRPMI). An SI> 2 is considered significant.
- A20J cells mouse B lymphoma, syngeneic with BALB / c, ATCC were grown
- TIB208 in complete culture medium (RPMI 1640 with the addition of 10% fetal bovine serum (SFB, Gibco), 2mM L-glutamine and pyruvate, 25 mM HEPES, 100 U / ml penicillin and 100 ⁇ g / ml of streptomycin) for two days. These cells were stimulated with OVA 10 g / ml one day before the test, we will call them A20JOVA. In the same way, MO5 cells (B16 melanoma cells synthesized with C57BL6 and stably transfected with a plasmid expressing OVA) were grown to be used as OVA presenting cells, in complete medium supplemented with 1 mg / ml of geneticin.
- RPMI 1640 with the addition of 10% fetal bovine serum (SFB, Gibco), 2mM L-glutamine and pyruvate, 25 mM HEPES, 100 U / ml penicillin and 100 ⁇ g / m
- mice splenocytes corresponding to each immunization group were grown in T25 bottles, in complete culture medium. The next day they were cultured in a plate of 6 wells 8x10 6 cells / ml, in 1 ml complete medium supplemented with recombinant IL-2 (10 U / ml). Subsequently, the stimuli listed below were added.
- Negative control complete culture medium with the addition of recombinant mouse IL-2 (10 U / ml) (PeproTech. Inc., Rocky Hill, USA)
- OVA 500 ⁇ g ml + OVA peptide 323-339 KISQAVH AAH AE IN EAGOVA restricted to MHC-II (I pg / ml) + A20JOVA cells treated with mitomycin in relation to 25 splenocytes was used: 1 APC, all resuspended in 1 ml of complete culture medium supplemented with recombinant IL-2.
- OVA 500 ⁇ g ml + OVA peptide 257-264 SIINFEKL restricted to MHC-I (0.5ug / ml) + MO5 presenting cells in relation to 25 splenocytes was used: 1 APC, all resuspended in 1 ml of complete culture medium supplemented with recombinant IL-2.
- the stimulated and control splenocytes were incubated for 30 min. at 4 ° C with specific monoclonal Acs anti-CD4 mouse labeled with PE-Cy5.5 and anti-CD8 mouse labeled with Alexa fluorine 647 (BD Biosciences, San Jose, CA). They were then washed with PBS and then fixed by treatment for 20 min. at room temperature with a 4% paraformaldehyde solution. After a wash with PBS they were permeabilized by treatment with permeabilization buffer (2% saponin, 10% SFB in PBS) for 30 min. The cells thus permeabilized, were centrifuged at 600g for 5 min., And treated with a specific anti-IFN- ⁇ mouse Ac labeled with PE for 30 min.
- permeabilization buffer 2% saponin, 10% SFB in PBS
- poles were assembled according to the immunization group. From each of them, 2x10 6 cells were taken, and labeled with FITC-labeled mouse anti-CD4, PE-Cy5.5-labeled mouse anti-CD8 and PE-labeled mouse anti-a4 7 (BD Biosciences , San Jose, CA). Subsequently, the cells were fixed with 100 ⁇ of 4% paraformaldehyde, and then analyzed by flow cytometer (BD FACSCalibur) and the results were analyzed using the FlowJo program (Version 5.7.2).
- ELISA polystyrene plates were used (Maxisorp, NUNC, Denmark). The plates were sensitized with 1 g of OVA per well and blocked with 200 ml of 3% skim milk (Molico) in PBS buffer. The plates were then incubated with serial dilutions of the sera and developed with mouse anti-lgG antibodies conjugated to HRP. For the determination of the specific isotypes, the plates were incubated with antibodies specific for the mouse Ig, lgG1 and lgG2a isotypes, conjugated to HRP (Santa Cruz). Incubations were performed for 1 hour at room temperature.
- MO5 cells (B16 melanoma cells synthesized with C57BL6 and stably transfected with a plasmid expressing OVA) cultured in complete medium + supplemented with 1 mg / ml of geneticin were used as blank.
- B16 cells (melanoma cells not transfected with OVA plasmid) were used.
- MO5 cells cultured in complete medium + supplemented with 1 mg / ml of geneticin were used as stimulation, which were pre-incubated with 10 g of OVA for 18 hours and then treated with mitomycin C (25 ⁇ g / ml) at 37 ° C for 30 min, washed with RPMI on 23 occasions and resuspended in complete medium.
- Effector cells were the splenocytes of the immunized and control mice (2.5 x 10 7 total cells) previously stimulated for 5 days with the described stimulator cells (0.5 x 10 6 cells) in complete medium + 10U / ml of recombinant IL-2.
- the white cells were incubated with radioactive sodium chromate in aqueous solution (Cr51, Amersham Biosciences) at a rate of 0.1 mCi / 1 x 1 0 6 cells, for 1 h in a 37 ° C water bath and then washed 3 times with RPMI Test:
- Lysis% c P m * + c P m ⁇ x 1 00
- Example 4 Experiments showing the adjuvant activity of Omp19S performed in transgenic mice:
- mice of the OT-1 strains whose CD8 + T cells express the specific T receptor for the bovine ovalbumin SIINFEKL (OVA) peptide, were used as donors of specific CD8 + T antigen specific cells. These mice were purchased from the Jackson Laboratory and brought to the country by Dr. Fernando Goldbaum, who kindly offered us this strain. C57 mice Singeneics acquired in the bioterium of the National University of La Plata were used as receptors for cells from OT-1 animals. All mice received water and food ad libitum and were kept under pathogen-free conditions.
- OVA bovine ovalbumin SIINFEKL
- OVA ovalbumin
- polypeptide was digested with proteinase K as a control.
- Omp19S was treated with K-agarose proteinase from tricirachium album (Sigma Aldrich) for 2 hours at 37 ° C following the manufacturer's instructions. Then, the resin was centrifuged and the supernatants were incubated for 1 h at 60 ° C in order to inactivate any trace of enzyme that could have been solubilized. Then the digestion was checked by SDS-PAGE and subsequent staining with Coomasie blue.
- the polypeptide so treated (Omp19S PK) was used as a control that the adjuvant effect is induced by said polypeptide.
- CD8 + OVA-specific cells were obtained from the spleen and lymph nodes of the OT-1 mice which were purified by negative selection using the mouse CD8 + T lymphocyte enrichment kit (BD Imag) and then labeled with 5 ⁇ of CFSE at 37 ° C for 15 minutes.
- the free carboxyfluorescein succinimidyl ester (CFSE) (Molecular Probes) was quenched by adding 10% SFB saline phosphate buffer (PBS). Subsequently, the labeled cells were washed with PBS and resuspended in a volume of 0.1 ml. The cells were then injected intravenously (iv) into the lateral veins of the animals' tail.
- mice were sacrificed three weeks after the last immunization and the percentage of T cells expressing the ⁇ 4 ⁇ 7 marker was analyzed in mesenteric ganglia.
- Example 6 Cloning of the genes encoding Omp16S and Omp19S into a eukaryotic expression vector:
- the oligonucleotide primers were designed from the nucleotide sequence of Omp16 and Omp19 (Genbank Omp16: ACCESSION L27996. Omp19: ACCESSION L27997).
- the primers contain Xhol and Xbal restriction sites (in bold). All "primers” were added the Kozak sequence of known efficiency for transcription in eukaryotes (underlined in the sequence).
- Omp16S "Sense”: 5 ' CTC CTC GAG ACC ACC ATG GCG TCA AAG AA 3 ' (SEQ ID No. 7)
- Antisense 5 'TTG TCT AGA TTA CCG TCC GGC CCC GTT GA 3 ' (SEQ ID No. 8)
- Antisense 5 ' TTT TCT AGA TCA GCG CGA CAG CGT CAC 3 ' (SEQ ID No. 10).
- the genes of interest were amplified by polymerase chain reaction (PCR) using the corresponding "primers” with an "anneling" temperature of 55 ° C and using Brucella genomic DNA as tempering.
- the pCI-Neo vector (Promega) was used to clone Omp16S and Omp19S. This vector was digested with Xhol and Xbal and then repurified by the phenol method: chloroform.
- the PCR amplification products were digested with the corresponding restriction enzymes. All PCR amplification products were repurified by Wizard PCR Preps (Promega, Madison, WI.USA).
- the ligation reactions were performed at 4 ° C overnight in the presence of the enzyme T4 DNA ligase (Promega), 1 ⁇ of the digested plasmid (pCI) and 2 ⁇ of the corresponding digested insert. Competent cells E. coli JM109 (Promega) were then transformed, using the C ⁇ Ca method with 5 ⁇ of the ligation reaction. The transformed bacteria were selected, growing at 37 ° C on LB plates with ampicillin (25 ⁇ g ml). To determine which colonies contained the plasmid with the appropriate insert, a "screening" was performed by the "colony PCR" method.
- COS-7 cells (ATCC, CRL1651, Rockville, MD, USA) were transfected by the liposome method with 2 ⁇ g of the following constructs: pCI-Omp16S, pCI-Omp19S, or the pCI vector (as a control) and 20 ⁇ of Lipofectamine (Gibco BRL, Gaithersburg, MD. USA) following the protocol of the provider.
- Plasmid expression was studied at 24 and 48 hours after transfection (transient expression) in total protein extracts. It was analyzed by Western Blot, using different monoclonal antibodies: anti-Omp16 or anti-Omp19 and was revealed using an ECL chemiluminescence kit (Amersham Pharmacia, Uppsala, Sweden).
- Example 7 Inhibition of the enzymatic activity of the stomach in vitro.
- BODIPY FL Bovine Ovalbumin (OVA) and BODIPY FL Casein were used as antigens. Both antigens are marked intramolecularly so that they do not flow when they are intact, but when they are degraded (EnzChek® Protease Assay Kit * green fluorescence * , Molecular probes).
- mice 6 to 8 weeks old of the strain Balb / c (H-2d) were used. They were acquired in the bioterium of the National University of La Plata and were maintained in the bioterium of the Institute of Studies of Humoral Immunity (IDEHU). They received water and food ad libitum. Obtaining mouse stomachs
- mice were sacrificed by cervical dislocation. An appropriate incision was made, opening the peritoneal cavity, to expose the stomach that was extracted with tweezers and scissors in aseptic conditions Processing of the stomachs of the mouse
- stomachs were first broken down with tweezers and scissors and the pieces obtained were transferred to a poter and embedded in a NaHCO3 buffer (1 M, pH8) to complete the disintegration.
- the extracts obtained were centrifuged at 10,000xg and the supernatants used to perform the test.
- Omp19S the stomachs were overcoated with Omp19S (100ug / ml) for 30 min and then with BODIPY FL casein or BODIPY FL OVA in 100 ⁇ of a NaHCO3 buffer.
- the stomachs were matched with BODIPY FL casein or BODIPY FL OVA (10ug / ml) in 100 ⁇ of a NaHCO3 buffer
- stomachs were matched with a mammalian protease inhibitor cocktail (Sigma) for 30 min and then with BODIPY FL casein or BODIPY FL OVA (1 Oug / rnl) in 100 ⁇ of a NaHCO3 buffer.
- BODIPY FLCasein or BODIPY FL OVA (10ug / ml) in a NaHCO3 buffer (1 M, pH8) treated with proteinase K (Sigma).
- a NaHCO3 buffer (1 M, pH8) treated with proteinase K (Sigma).
- the reaction mixtures were transferred to black opaque 96 well plates (low autofluorescence) (Costar). Fluorescence emission was performed on a Victor3 plate reader, Perkin Elmer, Waltham, MA
- Example 8 Inhibition of the degradation of different eukaryotic or bacterial antigens by stomach enzymes.
- Eukaryotic antigens Bovine ovalbumin (OVA), Serum bovine albumin (BSA)
- Bacterial antigens Recombinant Brucella Lumazine synthetase (BLS), Recombinant Brucella Chaperone (DnaK) and recombinant Brucella trans isomerase prolyl cis peptidyl cis (SurA).
- each reaction mixture was subjected to a polyacrylamide gel electrophoresis with sodium dodecyl sulfate (SDS-PAGE) and subsequent staining with Coomasie blue.
- Example 9 Co-administration of Omp19S inhibits the degradation of antigens by stomach proteases in vivo.
- BODIPY FL Casein EnzChek® Protease Assay Kit * green fluorescence * , Molecular probes
- mice 6 to 8 weeks old of the strain Balb / c (H-2d) were used. They were acquired in the bioterium of the National University of La Plata and were maintained in the bioterium of the Institute of Studies of Humoral Immunity (IDEHU). They received water and food ad libitum.
- mice After 15 min. from inoculation the mice were sacrificed by cervical dislocation, and the stomachs were extracted and processed.
- the supernatants of the stomach extracts obtained were transferred to black opaque 96 well plates (low autofluorescence) (costar). Fluorescence emission was performed on a Victor3 plate reader, Perkin Elmer, Waltham, MA.
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SESARDIC: "Regulatory considerations on new adjuvants and delivery systems", VACCINE, vol. 24, no. 2, 2006, pages S2 - 86,7 |
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Also Published As
Publication number | Publication date |
---|---|
US20120258145A1 (en) | 2012-10-11 |
ES2542973T3 (es) | 2015-08-13 |
EP2491946A1 (en) | 2012-08-29 |
CN102711815B (zh) | 2015-05-20 |
CA2778359C (en) | 2019-07-16 |
EP2491946B1 (en) | 2015-04-22 |
AR073907A1 (es) | 2010-12-09 |
CA2778359A1 (en) | 2011-04-28 |
MX2012004622A (es) | 2012-05-08 |
BR112012009239B1 (pt) | 2021-10-13 |
US9511137B2 (en) | 2016-12-06 |
CN102711815A (zh) | 2012-10-03 |
EP2491946A4 (en) | 2013-06-19 |
DK2491946T3 (en) | 2015-07-27 |
BR112012009239A2 (pt) | 2017-06-06 |
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