JP2004010511A - Stabilized injection of pth in aqueous solution - Google Patents

Stabilized injection of pth in aqueous solution Download PDF

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JP2004010511A
JP2004010511A JP2002163839A JP2002163839A JP2004010511A JP 2004010511 A JP2004010511 A JP 2004010511A JP 2002163839 A JP2002163839 A JP 2002163839A JP 2002163839 A JP2002163839 A JP 2002163839A JP 2004010511 A JP2004010511 A JP 2004010511A
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pth
aqueous solution
injection
aqueous
solution
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JP4252260B2 (en
JP2004010511A5 (en
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Koji Watanabe
渡邊 浩二
Hitoshi Yamada
山田 仁
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Asahi Kasei Corp
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Asahi Kasei Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To obtain a PTH aqueous solution stable to light and heat, especially to provide a prescription of an aqueous injection. <P>SOLUTION: The PTH aqueous solution is obtained by adding methionine and/or xylitol to an aqueous solution containing PTH as an active ingredient. Preferably, the aqueous solution has pH 3-5 and human PTH (1-34) is used as PTH. Consequently, the PTH aqueous solution which is not a dissolution type in use, in which PTH is made into the aqueous solution in advance and which is stable to heat and light is obtained. Hereby deactivation in distribution or in hospitals is prevented. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【産業上の利用分野】本発明は、PTH(PTH:ParathyroidHormone)を有効成分とする安定な水溶液に関する。
【0002】
【従来の技術】PTHは、カルシトニン類やビタミンD類とともに、血中カルシウム濃度の調節に関与する副甲状腺ホルモンであり、副甲状腺機能低下症の診断薬として用いられている。また、骨に作用する事が知られており骨粗鬆症の治療薬としても有望視されている。しかしながらPTHを水溶液剤とした場合、保存安定性が悪く、この問題点を回避するために、従来より用時溶解型の凍結乾燥製剤が通常用いられてきた。用時溶解型凍結乾燥製剤の安定化剤としては、マンニトール、グルコース、ソルビトール、またはシュークロス、トレハロース、ラクトースの糖類、及び塩化ナトリウム等の塩類が知られている(特開平5−306235号公報)。
【0003】
一方、用時溶解型凍結乾燥製剤は使用時の操作が煩雑であり、また操作中に微生物汚染を受けやすい。さらに近年発達したプレフィルドシリンジ等の注射剤キットには適用しにくい剤型である。そこで水溶液注射剤の開発が求められているが、その安定化法技術の一例として、マンニトール、プロピレングリコール等のポリオールを安定化剤として配合し、さらにベンジルアルコール、m−クレゾール等の保存剤を含んだ安定化法が知られている(特開2000−524006)。しかしながら、これら技術の保存安定性は十分なものではなく、医薬品の流通上で失活したり、使用時の不十分な管理により光を受けると劣化する恐れが懸念される。
【0004】
【発明が解決しようとする課題】
本発明は、PTHの光及び熱に対する安定な水溶液、とりわけ水溶液注射剤の処方を提供するものである。
【0005】
【課題を解決するための手段】
本発明者は、PTH水溶液における光及び熱に対する保存安定性の問題点の解決を目指し、さらに安全で安定な製剤処方の確立を目標として種々研究を続けた結果、意外にも、メチオニン及びまたはキシリトールを安定化剤として添加することによって、水溶液の光及び熱安定性が著しく向上する事を発見し、光及び熱に対して安定な水溶液、水溶液注射剤を完成するに至った。
【0006】
本発明の有効成分であるPTH(副甲状腺ホルモン)は、血清カルシウム上昇作用を有する分子量約4,000〜10,000のペプチド類であって、34〜84個のアミノ酸配列を有し、天然型PTHまたは同様の生物学的活性を有する類似体が知られている。本発明は種々のアミノ酸数のPTH、例えば(1−34),(1−35),(1−36),(1−37),(1−38),(1−84)等に使用できるが、その中でも分子量約4,400の34個のアミノ酸配列を有するh−PTH(1−34)を使用することが好ましい。さらにpHは3〜5であることが好ましい。
【0007】
本発明に使用する安定化剤は、アミノ酸の一つであるメチオニンと糖であるキシリトールである。好ましくはメチオニンを用いる。メチオニンはDL体とL体が用いられるが、いずれも好ましい。上記メチオニンあるいはキシリトールの添加量は、いずれも、PTH1重量に対し、5重量以上が好ましく、さらに好ましくは、40から4,000重量を水溶液中のPTH濃度に応じて添加すればよい。
【0008】
PTH水溶液は、充填容器、例えばアンプル、バイアル、プレフィルドシリンジ、ソフトバック、自己注射型のペン型キット等に充填することにより、安定なPTH製剤とすることができる。これらの充填容器の形状は特に限定されない。予め注射筒に水溶液を充填したプレフィルドシリンジは、医療現場等においてアンプル・バイアル等の場合のように注射筒に移し替えすることなく、人体に注射できるため簡便であり、微生物汚染の可能性が低いという利点がある。
【0009】
それらの充填容器の材質として、ガラスあるいはプラスチックが挙げられる。ガラス容器としては例えばホウケイ酸ガラスが挙げられる。プラスチック容器としては、環状ポリオレフィン、ポリエチレン、ポリプロピレン、環状ポリオレフィンとα−オレフィンの共重合体、ポリエチレンテレフタレート、ポリスチレン、ABS樹脂、ポリエステル、ポリ塩化ビニル、ナイロン、ポリテトラフルオロエチレン、ポリメチルペンテン、6フッ化樹脂、ポリメチルメタアクリレート、ポリカーボネイト等とそれら樹脂とシクロオレフィン類との共重合体などが挙げられるがこの限りでない。好ましくは環状ポリオレフィン、ポリスチレンが挙げられる。プレフィルドシリンジの場合は、材質がプラスチックであることが好ましい。輸送時軽く、耐破損性に優れるからである。
【0010】
水溶液注射剤を調製するに当たっては、例えば注射用蒸留水を使用して、0.1〜100mMのpH緩衝液にて、pH3〜5に調整、好ましくはpH4.0に調整する。使用するpH緩衝剤としては、酢酸、酒石酸、乳酸、クエン酸、リン酸及びその塩を用いることが例示され、好ましくは酢酸及びその塩である。こうして得られた溶液に安定化剤としての有効量を添加して、酢酸等のpH調節剤を用いてpH4.0に微調整する。次いで、これを水性媒体として、有効成分であるPTHの有効量を溶解する。
【0011】
PTHの使用量は、水溶液1mL当たり0.5〜500μgであり、好ましくは1mL当たり5〜300μgである。さらに等張化剤として塩化ナトリウム、塩化カルシウム、塩化マグネシウム、炭酸水素ナトリウム、ブドウ糖及びマクロゴール4000等を適宜添加しても良い。その後に濾過滅菌処理を行い、アンプル、バイアル及びプレフィルドシリンジ、自己注射型のペン型キット等に無菌的に充填する。かくして、安定なPTH水溶液注射剤を得る。
【0012】
【実施例】
以下、実施例により本発明を説明するが、本発明は、これらの実施例に限られるものではない。
【0013】
【実施例1】
注射用蒸留水を使用して50mM、pH4.0の酢酸ナトリウム緩衝液を500mL得た。この溶液にDL−メチオニンを1.4g加えて70mLになる様に調製した。こうして得られた溶液にPTH(1−34)の約2.1mgを溶解してPTH水溶液を得た。次にこのPTH水溶液を濾過滅菌処理した後、アンプルに約1mLずつ充填して、PTH(1−34)を約30μg含有する水溶液注射剤を製造した。
【0014】
【実施例2】
実施例1において、DL−メチオニンのかわりにL−メチオニンを使用し、同様な処理を実施した後、アンプルに約1mLずつ充填して、PTH(1−34)を約30μg含有する水溶液注射剤を製造した。
【0015】
【実施例3】
実施例1と同様の調製方法をもって、プラスチック製シリンジに約1mLずつ充填してPTH(1−34)を約30μg含有するプレフィルドシリンジの水溶液注射剤を製造した。
【0016】
【実施例4】
実施例3において、DL−メチオニンのかわりにL−メチオニンを使用し、同様な処理をした後、プラスチック製シリンジに約1mLずつ充填してPTH(1−34)を約30μg含有するプレフィルドシリンジの水溶液注射剤を製造した。
【0017】
【比較例1】
注射用蒸留水を使用して酢酸8.7mM、酢酸ナトリウム0.88mM/mLの酢酸ナトリウム緩衝液にマンニトール50g及びm−クレゾール2.5gを加えて1,000mLの水溶液を作成する。この溶液150mLにPTH(1−34)の約4.5mgを溶解してPTH水溶液を得た。次にこのPTH水溶液を濾過滅菌処理した後、アンプルに約1mLずつ充填してPTH(1−34)を約30μg含有する水溶液注射剤を製造した。
【0018】
【比較例2】
注射用蒸留水を使用してL−アルギニン3.75gを加えて150mLの水溶液を作成する。この水溶液に酢酸適量を滴下してpH6.5に調整した200mLの水溶液を得た。この溶液150mLにPTH(1−34)の約22.5mgを溶解してPTH水溶液を得た。次にこのPTH水溶液を濾過滅菌した後、アンプルに約1mLずつ充填してPTH(1−34)を約150μg含有する水溶液注射剤を製造した。
【0019】
【比較例3】
注射用蒸留水を使用して50mM、pH4.0の酢酸ナトリウム緩衝液200mLを得た。この溶液150mLにPTH(1−34)の約4.5mgを溶解してPTH水溶液を得た。次にこのPTH水溶液を濾過滅菌処理した後、アンプルに約1mLずつ充填してPTH(1−34)を約30μg含有する、本発明の安定化剤を含まない水溶液注射剤を製造した。
〔試験方法〕 前述の実施例1〜3で得た本発明品及び、比較例1〜3の各々を、光安定性試験器及び40℃安定性試験器に保存した後、経時的にサンプリングを行い、次の条件による高速液体クロマトグラフィー(HPLC)を用いてPTH含量を測定した。
HPLC測定条件
機器名:島津10Aシリーズ
カラム:オクタデシルシリカ 150×4.6mmI.D.
カラム温度:40℃付近の一定温度
移動相:0.1%TFA(トリフルオロ酢酸)とアセトニトリルの混液
〔結果〕 実施例と比較例での光安定性試験及び40℃安定性試験でのHPLC残存率を表1及び表2に示した。
安定性試験器中のHPLC残存率(%)
【0020】
【表1】

Figure 2004010511
【0021】
【表2】
Figure 2004010511
【0022】
表1及び表2の通り、本発明の実施例1〜3の水溶液注射剤は比較例1〜3に対して、光及び熱に対する安定性が向上していることを示した。特に光安定性においては、メチオニンを安定剤として用いた実施例1、2は60万Lux・hrにおいて90%以上、120万Lux・hrでも85%以上と高い残存率を示し、遮光包装や光に対する注意事項等の特別な配慮が不要となる。また、キシリトールを用いた実施例3も従来技術の比較例に対してより高い残存率を示した。一方、熱に対してもメチオニンを用いた実施例1、2はより高い残存率を示し、より長い有効期間を設定できることが示された。キシリトールを用いた実施例3も、比較例と同等以上の安定性を示した。
【0023】
【発明の効果】
以上の通り、従前の技術を用いたPTH水溶液注射剤の場合、光及び熱安定性は不十分であったが、本発明によって全く意外にも、メチオニン及びまたはキシリトールを安定化剤として添加する事で熱及び、特に光に対して安定な水溶液注射剤を製造する事を可能とした。[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stable aqueous solution containing PTH (PTH) as an active ingredient.
[0002]
2. Description of the Related Art PTH is a parathyroid hormone involved in the regulation of blood calcium concentration, together with calcitonins and vitamin Ds, and is used as a diagnostic agent for hypoparathyroidism. In addition, it is known to act on bones, and is expected as a therapeutic agent for osteoporosis. However, when PTH is used as an aqueous solution, the storage stability is poor, and in order to avoid this problem, a freeze-dried preparation that has been dissolved at the time of use has been conventionally used. Known stabilizers for lyophilized preparations for use are salts such as mannitol, glucose, sorbitol, sucrose, trehalose, lactose sugars, and sodium chloride (Japanese Patent Laid-Open No. 5-306235). .
[0003]
On the other hand, lyophilized preparations that are dissolved at the time of use are cumbersome to use and are susceptible to microbial contamination during the operation. Furthermore, it is a dosage form that is difficult to apply to injection kits such as prefilled syringes developed in recent years. Therefore, development of an aqueous solution injection is required, but as an example of the stabilization method technique, a polyol such as mannitol or propylene glycol is blended as a stabilizer, and a preservative such as benzyl alcohol or m-cresol is further included. A stabilization method is known (Japanese Patent Laid-Open No. 2000-524006). However, the storage stability of these technologies is not sufficient, and there is a concern that they may be deactivated in the distribution of pharmaceuticals or deteriorated when receiving light due to insufficient management during use.
[0004]
[Problems to be solved by the invention]
The present invention provides a formulation of a PTH light and heat stable aqueous solution, especially an aqueous solution injection.
[0005]
[Means for Solving the Problems]
As a result of continuing various studies aimed at solving the problem of storage stability against light and heat in an aqueous solution of PTH and further establishing a safe and stable pharmaceutical formulation, the present inventors have surprisingly found that methionine and / or xylitol. As a stabilizer, it has been found that the light and heat stability of the aqueous solution is remarkably improved, and an aqueous solution and an aqueous solution injection that are stable to light and heat have been completed.
[0006]
PTH (parathyroid hormone) which is an active ingredient of the present invention is a peptide having a molecular weight of about 4,000 to 10,000 having a serum calcium-elevating action, having a sequence of 34 to 84 amino acids, a natural type PTH or analogs with similar biological activity are known. The present invention can be used for PTH having various amino acid numbers, such as (1-34), (1-35), (1-36), (1-37), (1-38), (1-84) and the like. Among them, it is preferable to use h-PTH (1-34) having a 34 amino acid sequence having a molecular weight of about 4,400. Furthermore, it is preferable that pH is 3-5.
[0007]
The stabilizer used in the present invention is methionine, which is one of amino acids, and xylitol, which is a sugar. Preferably methionine is used. As methionine, DL form and L form are used, and both are preferable. The amount of methionine or xylitol added is preferably 5 or more, more preferably 40 to 4,000, depending on the PTH concentration in the aqueous solution.
[0008]
The PTH aqueous solution can be made into a stable PTH preparation by filling a filling container such as an ampoule, a vial, a prefilled syringe, a soft bag, a self-injection pen-type kit or the like. The shape of these filling containers is not particularly limited. Prefilled syringes with prefilled syringes filled with aqueous solutions are simple because they can be injected into the human body without being transferred to syringes as in the case of ampoules and vials at medical sites, etc., and have a low possibility of microbial contamination There is an advantage.
[0009]
Examples of the material for these filling containers include glass and plastic. An example of the glass container is borosilicate glass. Plastic containers include cyclic polyolefin, polyethylene, polypropylene, copolymer of cyclic polyolefin and α-olefin, polyethylene terephthalate, polystyrene, ABS resin, polyester, polyvinyl chloride, nylon, polytetrafluoroethylene, polymethylpentene, 6 fluorine. Examples of such resins include, but are not limited to, fluorinated resins, polymethyl methacrylate, polycarbonate and the like and copolymers of these resins and cycloolefins. Preferably cyclic polyolefin and polystyrene are used. In the case of a prefilled syringe, the material is preferably plastic. This is because it is light during transportation and has excellent breakage resistance.
[0010]
In preparing an aqueous solution injection, for example, distilled water for injection is used and adjusted to pH 3 to 5, preferably pH 4.0, with a pH buffer of 0.1 to 100 mM. Examples of the pH buffer to be used include acetic acid, tartaric acid, lactic acid, citric acid, phosphoric acid and salts thereof, preferably acetic acid and salts thereof. An effective amount as a stabilizer is added to the solution thus obtained and finely adjusted to pH 4.0 using a pH adjusting agent such as acetic acid. Next, an effective amount of PTH as an active ingredient is dissolved using this as an aqueous medium.
[0011]
The amount of PTH used is 0.5 to 500 μg per mL of aqueous solution, preferably 5 to 300 μg per mL. Further, sodium chloride, calcium chloride, magnesium chloride, sodium hydrogen carbonate, glucose, macrogol 4000 and the like may be added as isotonic agents as appropriate. Thereafter, the solution is sterilized by filtration and aseptically filled into ampoules, vials and prefilled syringes, self-injection pen-type kits and the like. Thus, a stable PTH aqueous solution injection is obtained.
[0012]
【Example】
EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited to these Examples.
[0013]
[Example 1]
500 mL of 50 mM sodium acetate buffer at pH 4.0 was obtained using distilled water for injection. To this solution, 1.4 g of DL-methionine was added to prepare 70 mL. About 2.1 mg of PTH (1-34) was dissolved in the solution thus obtained to obtain an aqueous PTH solution. Next, this PTH aqueous solution was subjected to filtration sterilization treatment, and then each ampule was filled with about 1 mL to produce an aqueous solution injection containing about 30 μg of PTH (1-34).
[0014]
[Example 2]
In Example 1, L-methionine was used instead of DL-methionine, and the same treatment was performed. Then, an ampule was filled with about 1 mL, and an aqueous solution injection containing about 30 μg of PTH (1-34) was prepared. Manufactured.
[0015]
[Example 3]
A prefilled syringe aqueous solution injection containing about 30 μg of PTH (1-34) was manufactured by filling the plastic syringe with about 1 mL by the same preparation method as in Example 1.
[0016]
[Example 4]
In Example 3, L-methionine was used in place of DL-methionine, and the same treatment was performed. Then, a plastic syringe was filled with about 1 mL each and a prefilled syringe aqueous solution containing about 30 μg of PTH (1-34). An injection was prepared.
[0017]
[Comparative Example 1]
Using distilled water for injection, 50 g of mannitol and 2.5 g of m-cresol are added to a sodium acetate buffer solution of 8.7 mM acetic acid and 0.88 mM sodium acetate / mL to make a 1,000 mL aqueous solution. About 150 mg of PTH (1-34) was dissolved in 150 mL of this solution to obtain an aqueous PTH solution. Next, this PTH aqueous solution was subjected to filtration sterilization treatment, and each ampule was filled with about 1 mL to prepare an aqueous solution injection containing about 30 μg of PTH (1-34).
[0018]
[Comparative Example 2]
Using distilled water for injection, 3.75 g of L-arginine is added to make a 150 mL aqueous solution. An appropriate amount of acetic acid was dropped into this aqueous solution to obtain 200 mL of an aqueous solution adjusted to pH 6.5. In 150 mL of this solution, about 22.5 mg of PTH (1-34) was dissolved to obtain an aqueous PTH solution. Next, this aqueous PTH solution was sterilized by filtration, and then an ampule was filled with about 1 mL each to prepare an aqueous solution injection containing about 150 μg of PTH (1-34).
[0019]
[Comparative Example 3]
200 mL of 50 mM sodium acetate buffer pH 4.0 was obtained using distilled water for injection. About 150 mg of PTH (1-34) was dissolved in 150 mL of this solution to obtain an aqueous PTH solution. Next, this aqueous PTH solution was sterilized by filtration, and then an ampule was filled in an amount of about 1 mL, and an aqueous solution injection containing no stabilizer of the present invention containing about 30 μg of PTH (1-34) was produced.
[Test Method] After the products of the present invention obtained in Examples 1 to 3 and Comparative Examples 1 to 3 were stored in a light stability tester and a 40 ° C. stability tester, sampling was performed over time. The PTH content was measured using high performance liquid chromatography (HPLC) under the following conditions.
HPLC measurement conditions Instrument name: Shimadzu 10A series Column: Octadecyl silica 150 × 4.6 mm I.D. D.
Column temperature: constant temperature around 40 ° C. Mobile phase: mixed solution of 0.1% TFA (trifluoroacetic acid) and acetonitrile [Result] Remaining HPLC in light stability test and 40 ° C. stability test in Examples and Comparative Examples The rates are shown in Tables 1 and 2.
HPLC residual rate (%) in the stability tester
[0020]
[Table 1]
Figure 2004010511
[0021]
[Table 2]
Figure 2004010511
[0022]
As shown in Tables 1 and 2, the aqueous solution injections of Examples 1 to 3 of the present invention showed improved stability against light and heat compared to Comparative Examples 1 to 3. In particular, in terms of light stability, Examples 1 and 2 using methionine as a stabilizer showed a high residual rate of 90% or more at 600,000 Lux · hr and 85% or more at 1.2 million Lux · hr. Special considerations, such as precautions for, become unnecessary. In addition, Example 3 using xylitol also showed a higher residual ratio than the comparative example of the prior art. On the other hand, Examples 1 and 2 using methionine with respect to heat also showed a higher survival rate, indicating that a longer effective period can be set. Example 3 using xylitol also showed stability equal to or higher than that of the comparative example.
[0023]
【The invention's effect】
As described above, in the case of the PTH aqueous solution injection using the conventional technique, the light and heat stability was insufficient, but unexpectedly, methionine and / or xylitol can be added as a stabilizer according to the present invention. This makes it possible to produce an aqueous solution injection that is stable against heat and particularly light.

Claims (4)

PTHを有効成分とし、安定化剤としてメチオニン及び/またはキシリトールを含有する事を特徴とするPTH水溶液。An aqueous PTH solution comprising PTH as an active ingredient and methionine and / or xylitol as a stabilizer. PTH水溶液がpH3〜5である事を特徴とする請求項1のPTH水溶液。The aqueous PTH solution according to claim 1, wherein the aqueous PTH solution has a pH of 3 to 5. PTHが、ヒト−PTH(1−34)である請求項1あるいは2に記載のPTH水溶液。The PTH aqueous solution according to claim 1 or 2, wherein PTH is human-PTH (1-34). PTH水溶液中におけるPTH濃度が0.5〜500μg/mLである請求項1から3に記載のPTH水溶液。The PTH aqueous solution according to claim 1, wherein the PTH concentration in the PTH aqueous solution is 0.5 to 500 μg / mL.
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