WO2021153365A1 - 膵島含有カプセルの製造方法 - Google Patents
膵島含有カプセルの製造方法 Download PDFInfo
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- WO2021153365A1 WO2021153365A1 PCT/JP2021/001767 JP2021001767W WO2021153365A1 WO 2021153365 A1 WO2021153365 A1 WO 2021153365A1 JP 2021001767 W JP2021001767 W JP 2021001767W WO 2021153365 A1 WO2021153365 A1 WO 2021153365A1
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- solution
- sodium alginate
- particles
- islets
- ornithine
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- 239000002775 capsule Substances 0.000 title claims abstract description 23
- 210000004153 islets of langerhan Anatomy 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 239000002245 particle Substances 0.000 claims abstract description 52
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000000661 sodium alginate Substances 0.000 claims abstract description 50
- 235000010413 sodium alginate Nutrition 0.000 claims abstract description 50
- 229940005550 sodium alginate Drugs 0.000 claims abstract description 50
- 108010055896 polyornithine Proteins 0.000 claims abstract description 30
- 238000003756 stirring Methods 0.000 claims abstract description 18
- 150000001768 cations Chemical class 0.000 claims abstract description 14
- 239000001509 sodium citrate Substances 0.000 claims abstract description 11
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims abstract description 11
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- 239000000243 solution Substances 0.000 description 67
- 230000004043 responsiveness Effects 0.000 description 12
- NOESYZHRGYRDHS-UHFFFAOYSA-N insulin Chemical compound N1C(=O)C(NC(=O)C(CCC(N)=O)NC(=O)C(CCC(O)=O)NC(=O)C(C(C)C)NC(=O)C(NC(=O)CN)C(C)CC)CSSCC(C(NC(CO)C(=O)NC(CC(C)C)C(=O)NC(CC=2C=CC(O)=CC=2)C(=O)NC(CCC(N)=O)C(=O)NC(CC(C)C)C(=O)NC(CCC(O)=O)C(=O)NC(CC(N)=O)C(=O)NC(CC=2C=CC(O)=CC=2)C(=O)NC(CSSCC(NC(=O)C(C(C)C)NC(=O)C(CC(C)C)NC(=O)C(CC=2C=CC(O)=CC=2)NC(=O)C(CC(C)C)NC(=O)C(C)NC(=O)C(CCC(O)=O)NC(=O)C(C(C)C)NC(=O)C(CC(C)C)NC(=O)C(CC=2NC=NC=2)NC(=O)C(CO)NC(=O)CNC2=O)C(=O)NCC(=O)NC(CCC(O)=O)C(=O)NC(CCCNC(N)=N)C(=O)NCC(=O)NC(CC=3C=CC=CC=3)C(=O)NC(CC=3C=CC=CC=3)C(=O)NC(CC=3C=CC(O)=CC=3)C(=O)NC(C(C)O)C(=O)N3C(CCC3)C(=O)NC(CCCCN)C(=O)NC(C)C(O)=O)C(=O)NC(CC(N)=O)C(O)=O)=O)NC(=O)C(C(C)CC)NC(=O)C(CO)NC(=O)C(C(C)O)NC(=O)C1CSSCC2NC(=O)C(CC(C)C)NC(=O)C(NC(=O)C(CCC(N)=O)NC(=O)C(CC(N)=O)NC(=O)C(NC(=O)C(N)CC=1C=CC=CC=1)C(C)C)CC1=CN=CN1 NOESYZHRGYRDHS-UHFFFAOYSA-N 0.000 description 10
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- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 5
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- 102000004877 Insulin Human genes 0.000 description 5
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- FHVDTGUDJYJELY-UHFFFAOYSA-N 6-{[2-carboxy-4,5-dihydroxy-6-(phosphanyloxy)oxan-3-yl]oxy}-4,5-dihydroxy-3-phosphanyloxane-2-carboxylic acid Chemical compound O1C(C(O)=O)C(P)C(O)C(O)C1OC1C(C(O)=O)OC(OP)C(O)C1O FHVDTGUDJYJELY-UHFFFAOYSA-N 0.000 description 1
- HFDKKNHCYWNNNQ-YOGANYHLSA-N 75976-10-2 Chemical compound C([C@@H](C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CCSC)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CC=1C=CC(O)=CC=1)C(N)=O)NC(=O)[C@H](CCCNC(N)=N)NC(=O)[C@H](CCCNC(N)=N)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](CC(O)=O)NC(=O)[C@H](C)NC(=O)[C@H](C)NC(=O)[C@H](CC=1C=CC(O)=CC=1)NC(=O)[C@H](CCC(N)=O)NC(=O)[C@H](C)NC(=O)[C@H](CCSC)NC(=O)[C@H](CCC(N)=O)NC(=O)[C@H](CCC(O)=O)NC(=O)[C@H]1N(CCC1)C(=O)[C@@H](NC(=O)[C@H](C)NC(=O)[C@H](CC(N)=O)NC(=O)[C@H](CC(O)=O)NC(=O)CNC(=O)[C@H]1N(CCC1)C(=O)[C@H](CC=1C=CC(O)=CC=1)NC(=O)[C@@H](NC(=O)[C@H]1N(CCC1)C(=O)[C@H](CCC(O)=O)NC(=O)[C@H](CC(C)C)NC(=O)[C@H]1N(CCC1)C(=O)[C@H](C)N)C(C)C)[C@@H](C)O)C1=CC=C(O)C=C1 HFDKKNHCYWNNNQ-YOGANYHLSA-N 0.000 description 1
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- DFPAKSUCGFBDDF-ZQBYOMGUSA-N [14c]-nicotinamide Chemical compound N[14C](=O)C1=CC=CN=C1 DFPAKSUCGFBDDF-ZQBYOMGUSA-N 0.000 description 1
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- MASNOZXLGMXCHN-ZLPAWPGGSA-N glucagon Chemical compound C([C@@H](C(=O)N[C@H](C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CC=1C2=CC=CC=C2NC=1)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CCSC)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H]([C@@H](C)O)C(O)=O)C(C)C)NC(=O)[C@H](CC(O)=O)NC(=O)[C@H](CCC(N)=O)NC(=O)[C@H](C)NC(=O)[C@H](CCCNC(N)=N)NC(=O)[C@H](CCCNC(N)=N)NC(=O)[C@H](CO)NC(=O)[C@H](CC(O)=O)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](CC=1C=CC(O)=CC=1)NC(=O)[C@H](CCCCN)NC(=O)[C@H](CO)NC(=O)[C@H](CC=1C=CC(O)=CC=1)NC(=O)[C@H](CC(O)=O)NC(=O)[C@H](CO)NC(=O)[C@@H](NC(=O)[C@H](CC=1C=CC=CC=1)NC(=O)[C@@H](NC(=O)CNC(=O)[C@H](CCC(N)=O)NC(=O)[C@H](CO)NC(=O)[C@@H](N)CC=1NC=NC=1)[C@@H](C)O)[C@@H](C)O)C1=CC=CC=C1 MASNOZXLGMXCHN-ZLPAWPGGSA-N 0.000 description 1
- 229960004666 glucagon Drugs 0.000 description 1
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- NHXLMOGPVYXJNR-ATOGVRKGSA-N somatostatin Chemical compound C([C@H]1C(=O)N[C@H](C(N[C@@H](CO)C(=O)N[C@@H](CSSC[C@@H](C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CC=2C=CC=CC=2)C(=O)N[C@@H](CC=2C=CC=CC=2)C(=O)N[C@@H](CC=2C3=CC=CC=C3NC=2)C(=O)N[C@@H](CCCCN)C(=O)N[C@H](C(=O)N1)[C@@H](C)O)NC(=O)CNC(=O)[C@H](C)N)C(O)=O)=O)[C@H](O)C)C1=CC=CC=C1 NHXLMOGPVYXJNR-ATOGVRKGSA-N 0.000 description 1
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Images
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Definitions
- Islet transplantation is a treatment method for diabetes that has a relatively low burden on the human body, but strong immunosuppression may be required for the transplanted islets to survive for a long period of time.
- a method of transplanting a large number of microencapsulated islets into the abdominal cavity has been investigated. In this case, immunosuppression is unnecessary, but sufficient therapeutic results have not yet been obtained.
- One issue is to provide an improved method for producing islet-containing capsules.
- Item 1 A step of preparing a sodium alginate solution A containing pancreatic islets at a concentration of 10,000 IEQ / mL or more.
- B A step of dropping the sodium alginate solution into a divalent cation solution and recovering the gelled particles.
- C A step of adding the particles recovered in the step (b) to the poly L-ornithine solution A, stirring the mixture, and then recovering the particles.
- D The particles recovered in step (c) are added to the sodium alginate solution B, and after stirring, the particles are recovered, and the particles recovered in step (e) (d) are added to the sodium citrate solution.
- a method for producing a pancreatic islet-containing capsule which comprises a step of collecting particles after stirring.
- Item 2. Item 2. The method according to Item 1, wherein the islets are islets obtained from young pigs 1 to 3 weeks old.
- Item 3. Item 2. The method according to Item 1 or 2, wherein the islet-containing capsule has an average diameter of 550 to 750 ⁇ m.
- Item 4. Item 6. The method according to any one of Items 1 to 3, wherein the sodium alginate concentration of the sodium alginate solution A is 1 w / v% or more and 3 w / v% or less.
- Item 5. Item 6.
- Encapsulated islets with improved glucose responsiveness are provided.
- the micrographs of the islets immediately after encapsulation and the islets cultured 25 days after encapsulation are shown.
- a to d are immediately after encapsulation
- e to h are after culturing for 25 days.
- a and e were prepared using 8,000 IEQ / mL islets
- b and f were prepared using 12,000 IEQ / mL islets
- c and g were prepared using 16,000 IEQ / mL. It was prepared using islets
- d and h were prepared using 20,000 IEQ / mL islets.
- the results of measuring the sugar responsiveness of pancreatic islets cultured 25 days after encapsulation are shown.
- the sugar responsiveness measured for islets cultured 25 days after encapsulation is shown as Stimulation Index (SI).
- SI Stimulation Index
- the results of measuring the glucose responsiveness of capsules containing islets of different sizes are shown.
- the results of SI measurement for arelet-containing capsules of different sizes are shown.
- the method for producing islet-containing capsules preferably includes the following steps (a) to (e): (A) A step of preparing a sodium alginate solution A containing pancreatic islets at a concentration of 10,000 IEQ / mL or more; (B) A step of dropping the sodium alginate solution into a divalent cation solution and recovering the gelled particles; (C) A step of adding the particles recovered in the step (b) to the poly L-ornithine solution A, stirring the mixture, and then recovering the particles; (D) The step of adding the particles recovered in the step (c) to the sodium alginate solution B, stirring and then recovering; and (e) adding the particles recovered in the step (d) to the sodium citrate solution and stirring. , The process of collecting.
- the islets used in step (a) preferably contain insulin-producing ⁇ -cells, glucagon-containing ⁇ -cells, somatostatin-secreting delta cells, and pancreatic polypeptide-containing cells (PP cells). It is preferred that the islets are mostly insulin-producing ⁇ -cells.
- the origin of the islets is not particularly limited, but is preferably human, pig, mouse, rat, monkey, or dog.
- the islets are preferably derived from pigs, preferably arelets of juvenile pigs (eg, 3 days to 4 weeks old or 7 days to 3 weeks old).
- Pancreatic islets can be obtained by optionally adopting methods known in the art. For example, a method using Liberase as a digestive enzyme (TJ Cavanagh et al. Transplantation Proceedings, 30, 367 (1998)) can be preferably used.
- the size of the islets is preferably 50 ⁇ m or more and 400 ⁇ m or less.
- the size of the islets can be measured using a microscope micrometer. It is preferable that the islets contain 10% or more of ⁇ cells as a characteristic. There is no particular upper limit on the proportion of ⁇ cells, but it is, for example, 80%.
- the physical characteristics of sodium alginate constituting the sodium alginate solution A are not particularly limited.
- the sodium alginate concentration of the sodium alginate solution A is not particularly limited, but is preferably 1 w / v% or more and 3 w / v% or less, for example.
- the sodium alginate solution A contains islets at a concentration of 10,000 IEQ / mL or more from the viewpoint of improving the glucose responsiveness of the islets after encapsulation.
- the IEQ means the number of islets based on a diameter of 150 ⁇ m.
- the islet concentration is preferably 11,000 IEQ / mL or higher, or 12,000 IEQ / mL or higher.
- the upper limit of the islet concentration is not particularly limited, but can be, for example, 30,000 IEQ / mL or less and 25,000 IEQ / mL or less.
- sodium alginate solution A is prepared so as to contain the pancreatic islets at the above concentration
- the specific preparation method thereof is not limited.
- sodium alginate solution A can be obtained by dissolving an appropriate amount of sodium alginate in physiological saline, adding an appropriate amount of pancreatic islets to the solution, and stirring as necessary.
- the divalent cation solution used in step (b) is not limited as long as gelled particles (capsules) containing pancreatic islets can be obtained by dropping the sodium alginate solution A therein.
- the divalent cation constituting such a divalent cation solution include salts that liberate divalent metal ions in the aqueous solution (for example, calcium chloride, calcium lactate, barium chloride, strontium chloride, etc.). ..
- the preferred salt is calcium chloride and the preferred divalent cation solution is calcium chloride solution.
- the concentration of the divalent cation in the divalent cation solution is not particularly limited and can be set in the range of, for example, 50 to 500 mM.
- the method of dropping the sodium alginate solution A into the divalent cation solution is not limited as long as the gelled particles containing the islets are obtained. In one embodiment, it is preferable to drop the sodium alginate solution A into the divalent cation solution through a needle of an appropriate size.
- Recovery of the gelled particles is optional, and can be carried out, for example, by allowing the divalent cation solution in which the gelled particles are formed to stand for a certain period of time, removing the supernatant, or repeating this.
- the poly-L-ornithine solution A used in the step (c) is not particularly limited as long as it can coat the gelled particles formed in the step (b).
- it can be prepared by dissolving poly-L-ornithine in physiological saline.
- the concentration of poly L-ornithine in the poly L-ornithine solution A is not particularly limited, but can be adjusted to, for example, 0.05 w / v% or more and 3.0 w / v% or less. In one embodiment, the concentration of poly-L-ornithine in the poly-L-ornithine solution A is preferably 0.1 w / v% or more and 2.0 w / v% or less.
- the “addition of the particles recovered in the step (b) to the poly L-ornithine solution A” in the step (c) also includes an embodiment in which the poly L-ornithine solution A is added to the gelled particles recovered in the step (b). do.
- the stirring speed and time in the step (c) are arbitrary, and for example, 1 minute to 20 minutes at 20 to 300 rpm is preferable.
- the mode of recovery of the gelled particles in the step (c) is arbitrary.
- the gelled particles can be recovered by allowing the poly L-ornithine solution A to stand for a certain period of time and removing the supernatant.
- the recovered gelled particles preferably have a structure in which the surface of the gelled layer with alginic acid is coated with poly-L-ornithine.
- the sodium alginate solution B used in the step (d) may have the same concentration as or different from the sodium alginate solution A used in the step (a).
- the sodium alginate concentration of the sodium alginate solution B is preferably lower than the sodium alginate concentration of the sodium alginate solution A from the viewpoint of ease of coating operation.
- the sodium alginate concentration of the sodium alginate solution B is 0.1 w / v% or more and 0.3 w / v% or less. Is preferable.
- the "addition of the particles recovered in the step (c) to the sodium alginate solution B" in the step (d) also includes an embodiment in which the sodium alginate solution B is added to the gelled particles recovered in the step (c).
- the stirring speed and time in the step (d) are arbitrary, and for example, stirring at 20 to 300 rpm for 1 minute to 15 minutes is preferable.
- the mode of recovery of the gelled particles in the step (d) is arbitrary.
- the gelled particles can be recovered by allowing the sodium alginate solution B to stand for a certain period of time and removing the supernatant. It is preferable that the surface of the gelled layer made of alginic acid is coated with polyL-ornithine, and the recovered gelled particles further have a gelled layer made of alginic acid on the surface.
- the particles recovered in step (c) are added to poly L-ornithine solution B before being added to sodium alginate solution B, and after stirring, the particles are recovered and used in step (d). It is preferably added to the sodium alginate solution B.
- the poly L-ornithine solution B may have the same concentration or different from that of the poly L-ornithine solution A.
- the polyL-ornithine concentration of the polyL-ornithine solution B is preferably lower than the polyL-ornithine concentration of the polyL-ornithine solution A.
- the polyL-ornithine concentration of the polyL-ornithine solution B is preferably 0.01 w / v% or more and less than 0.1 w / v%.
- the sodium citrate solution used in the step (e) preferably contains sodium citrate at a concentration of 0.5 to 3 w / v%.
- a sodium citrate solution is added for the purpose of chelating the cations in the gelled particles and bringing them closer to liquid from the gel to promote insulin release.
- the "addition of the particles recovered in the step (d) to the sodium citrate solution" in the step (e) also includes an embodiment in which the sodium citrate solution is added to the gelled particles recovered in the step (d).
- the stirring speed and time in the step (e) are arbitrary, and are preferably, for example, 1 minute to 15 minutes at 20 to 300 rpm.
- the mode of collecting the gelled particles in the step (e) is arbitrary.
- the gelled particles can be recovered by allowing the sodium citrate solution to stand for a certain period of time and removing the supernatant. It is considered that the recovered gelled particles are closer to liquid inside.
- the gelled particles (capsules containing islets) recovered in the step (e) preferably have an average diameter of 2000 ⁇ m or less, preferably 1500 ⁇ m or less or 1000 ⁇ m, from the viewpoint of exhibiting good sugar responsiveness. The following is more preferable.
- the lower limit of the size of the islet-containing capsule is not particularly limited, but is, for example, 100 ⁇ m or more, 200 ⁇ m or more, 300 ⁇ m or more, 400 ⁇ m or more, or 500 ⁇ m or more.
- the average diameter is a value obtained by measuring the size of 20 to 50 islet-containing capsules with a micrometer of a microscope and calculating the average value.
- the beads were collected, further added to 0.038 w / v% PLO solution, stirred for 6 minutes and recovered, added to 0.17 w / v% sodium alginate solution and stirred for 6 minutes, and finally 1.6%. It was added to a sodium citrate solution and stirred for 2 minutes to obtain encapsulated pancreatic islets.
- the resulting encapsulated islets were cultured at 37 ° C. in a CO 2 incubator for 25 days.
- encapsulated islets Immediately after encapsulation and 25 days after culturing, a small amount of encapsulated islets was taken from the flask and transferred to a 35 mm dish. The dish was observed with an inverted microscope (4 magnification), and the encapsulated islets were photographed (Fig. 1).
- a to d in FIG. 1 are immediately after encapsulation, and e to h are 25 days after culturing.
- a and e were prepared using 8,000 IEQ / mL islets
- b and f were prepared using 12,000 IEQ / mL islets
- c and g were prepared using 16,000 IEQ / mL. It was prepared using islets, and d and h were prepared using 20,000 IEQ / mL islets.
- the average capsule diameter was about 600 ⁇ m.
- Each encapsulated islet 500IEQ after culturing in RPMI 1640 medium supplemented with 2% porcine serum, 10 mM nicotinamide, and antibiotics for 25 days after encapsulation was 74 ⁇ m Netwell Insert (Corning). Made). After washing, the insert containing the islets was allowed to stand in a 500 mg / L low glucose medium for 1 hour, after which the medium was collected. Subsequently, the insert containing the encapsulated islets was allowed to stand in 3750 mg / L high glucose medium for 1 hour, and then the medium was collected. The insulin concentration in the recovered medium was measured using the ELISA method (Fig. 2).
- the ratio of insulin concentration in high glucose medium to insulin concentration in low glucose medium was calculated as Stimulation Index (SI) (FIG. 3). As shown in FIG. 2, it was found that capsules made with higher concentrations of islets showed higher glucose responsiveness than capsules made with 8,000 IEQ / mL islets.
- An encapsulated islet having a diameter of about 500 to 1800 ⁇ m was prepared by adjusting the air flow rate in the same procedure as in the above.
- a 3000 ⁇ m encapsulated islet was prepared by connecting an outer cylinder of 18 G surflow to a syringe and dropping it.
- Pancreatic islet-containing capsules were prepared using a suspension containing 16,000 IEQ / mL islets derived from immature pigs.
- FIGS. 4 and 5 The results of evaluating the glucose responsiveness of the obtained islet-containing capsules in the same manner as in 2 above are shown in FIGS. 4 and 5. From these results, it was found that a capsule diameter of 2000 ⁇ m or less, 1800 ⁇ m or less, and 1500 ⁇ m or less is preferable for sugar responsiveness.
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Abstract
Description
項1.
(a)膵島を10,000IEQ/mL以上の濃度で含有するアルギン酸ナトリウム溶液Aを調製する工程、
(b)該アルギン酸ナトリウム溶液を二価カチオン溶液に滴下し、ゲル化した粒子を回収する工程、
(c)工程(b)で回収した粒子をポリL-オルニチン溶液Aに添加し、撹拌後、粒子を回収する工程、
(d)工程(c)で回収した粒子をアルギン酸ナトリウム溶液Bに添加し、撹拌後、粒子を回収する工程、及び
(e)工程(d)で回収した粒子をクエン酸ナトリウム溶液に添加し、撹拌後、粒子を回収する工程
を含む、膵島含有カプセルの製造方法。
項2.
膵島が、生後1~3週齢の幼若ブタから取得した膵島である、項1に記載の方法。
項3.
膵島含有カプセルの平均直径が550~750μmである、項1又は2に記載の方法。
項4.
アルギン酸ナトリウム溶液Aのアルギン酸ナトリウム濃度が1w/v%以上3w/v%以下である、項1~3のいずれかに記載の方法。
項5.
ポリL-オルニチン溶液AのポリL-オルニチン濃度が0.05w/v%以上3w/v%以下である、項1~4のいずれかに記載の方法。
項6.
アルギン酸ナトリウム溶液Bのアルギン酸ナトリウム濃度が0.1w/v%以上0.3w/v%以下である、項1~5のいずれかに記載の方法。
項7.
工程(d)において、工程(c)で回収した粒子を、ポリL-オルニチン溶液Bに添加し、撹拌後、回収した後に、アルギン酸ナトリウム溶液Bに添加する、項1~6のいずれかに記載の方法。
項8.
ポリL-オルニチン溶液BのポリL-オルニチン濃度が0.01w/v%以上0.1w/v%未満である、項7に記載の方法。
(a)膵島を10,000IEQ/mL以上の濃度で含有するアルギン酸ナトリウム溶液Aを調製する工程;
(b)該アルギン酸ナトリウム溶液を二価カチオン溶液に滴下し、ゲル化した粒子を回収する工程;
(c)工程(b)で回収した粒子をポリL-オルニチン溶液Aに添加し、撹拌後、粒子を回収する工程;
(d)工程(c)で回収した粒子をアルギン酸ナトリウム溶液Bに添加し、撹拌後、回収する工程;及び
(e)工程(d)で回収した粒子をクエン酸ナトリウム溶液に添加し、拌後、回収する工程。
1.7w/v%アルギン酸ナトリウム溶液(Pronova)に生後14日齢のブタから分離した幼若ブタ由来膵島を8,000IEQ/mL、12,000IEQ/mL、16,000IEQ/mL、又は20,000IEQ/mLの濃度で懸濁した。これをニードルに通し、エアフローにより懸濁液をカットしながら109mM塩化カルシウム溶液中に滴下させた。塩化カルシウム溶液から固化したアルギン酸ビーズを回収し、0.075w/v%のポリL-オルニチン(PLO)(分子量5,000~15,000)溶液に添加し、10分間撹拌した。ビーズを回収し、さらに0.038w/v%PLO溶液に添加し、6分間撹拌して回収し、0.17w/v%アルギン酸ナトリウム溶液に添加して6分間撹拌し、最後に1.6%クエン酸ナトリウム溶液に添加して2間分撹拌させてカプセル化膵島を得た。得られたカプセル化膵島を37℃でCO2インキュベーター中で25日間培養した。
カプセル化してから25日間、RPMI1640培地に2%ブタ血清、10 mMニコチンアミド、及び抗生物質を添加した培地中で培養した後の各カプセル化膵島500IEQを74μmネットウェルインサート(Corning社製)に入れた。洗浄後、膵島の入ったインサートを500mg/L低グルコース培地中で1時間静置させ、その後培地を回収した。続いて、カプセル化膵島の入ったインサートを3750mg/L高グルコース培地中有で1時間静置させ、その後培地を回収した。回収した培地中のインスリン濃度をELISA法を用いて測定した(図2)。また、低グルコース培地中インスリン濃度に対する高グルコース培地中インスリン濃度比をStimulation Index(SI)として算出した(図3)。図2に示されるとおり、8,000IEQ/mLの膵島で作成したカプセルよりも、より高い濃度の膵島を用いて作成したカプセルの方が、高い糖応答性を示すことが判明した。
上記1.と同様の手順で、エアフローの速度を調整することで直径約500~1800μmのカプセル化膵島を作製した。3000μmのカプセル化膵島はシリンジに18Gサーフローの外筒を接続して滴下させ作製した。16,000IEQ/mLの幼若ブタ由来膵島を含有する懸濁液を用いて膵島含有カプセルを作製した。
Claims (8)
- (a)膵島を10,000IEQ/mL以上の濃度で含有するアルギン酸ナトリウム溶液Aを調製する工程、
(b)該アルギン酸ナトリウム溶液を二価カチオン溶液に滴下し、ゲル化した粒子を回収する工程、
(c)工程(b)で回収した粒子をポリL-オルニチン溶液Aに添加し、撹拌後、粒子を回収する工程、
(d)工程(c)で回収した粒子をアルギン酸ナトリウム溶液Bに添加し、撹拌後、粒子を回収する工程、及び
(e)工程(d)で回収した粒子をクエン酸ナトリウム溶液に添加し、撹拌後、粒子を回収する工程
を含む、膵島含有カプセルの製造方法。 - 膵島が、生後1~3週齢の幼若ブタから取得した膵島である、請求項1に記載の方法。
- 膵島含有カプセルの平均直径が550~750μmである、請求項1又は2に記載の方法。
- アルギン酸ナトリウム溶液Aのアルギン酸ナトリウム濃度が1w/v%以上3w/v%以下である、請求項1~3のいずれかに記載の方法。
- ポリL-オルニチン溶液AのポリL-オルニチン濃度が0.05w/v%以上3w/v%以下である、請求項1~4のいずれかに記載の方法。
- アルギン酸ナトリウム溶液Bのアルギン酸ナトリウム濃度が0.1w/v%以上0.3w/v%以下である、請求項1~5のいずれかに記載の方法。
- 工程(d)において、工程(c)で回収した粒子を、ポリL-オルニチン溶液Bに添加し、撹拌後、回収した後に、アルギン酸ナトリウム溶液Bに添加する、請求項1~6のいずれかに記載の方法。
- ポリL-オルニチン溶液BのポリL-オルニチン濃度が0.01w/v%以上0.1w/v%未満である、請求項7に記載の方法。
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CA3169602A CA3169602A1 (en) | 2020-01-28 | 2021-01-20 | Method of producing capsule comprising pancreatic islet |
CN202180011085.1A CN115003316A (zh) | 2020-01-28 | 2021-01-20 | 含胰岛胶囊的制造方法 |
JP2021574664A JPWO2021153365A1 (ja) | 2020-01-28 | 2021-01-20 | |
EP21747308.1A EP4098269A4 (en) | 2020-01-28 | 2021-01-20 | METHOD FOR PRODUCING CAPSULES CONTAINING PANCREAS ISLE CELLS |
AU2021214124A AU2021214124A1 (en) | 2020-01-28 | 2021-01-20 | Method of producing capsule including pancreatic islet |
KR1020227029336A KR20220132600A (ko) | 2020-01-28 | 2021-01-20 | 췌도 함유 캡슐의 제조 방법 |
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WO2002032437A1 (en) * | 2000-10-17 | 2002-04-25 | Diatranz Limited | Preparation and xenotransplantation or porcine islets |
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