JP2013018709A - 慢性痒疹治療用外用剤 - Google Patents
慢性痒疹治療用外用剤 Download PDFInfo
- Publication number
- JP2013018709A JP2013018709A JP2011150813A JP2011150813A JP2013018709A JP 2013018709 A JP2013018709 A JP 2013018709A JP 2011150813 A JP2011150813 A JP 2011150813A JP 2011150813 A JP2011150813 A JP 2011150813A JP 2013018709 A JP2013018709 A JP 2013018709A
- Authority
- JP
- Japan
- Prior art keywords
- external preparation
- examples
- chondroitin sulfate
- prurigo
- skin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Abstract
【解決手段】多硫酸化コンドロイチン硫酸を有効成分とする、慢性痒疹治療用外用剤。前記外用剤は、特に結節性痒疹の治療に適している。前記外用剤は、ステロイドを含まないことが好ましい。
【選択図】なし
Description
アトピー性皮膚炎は、結節性痒疹の誘因の一つとして知られているが、結節性痒疹は、アトピー性皮膚炎と異なる疾患として位置づけられている。
しかし、紫外線療法、凍結療法、局部注射による治療は、医療機関に行く必要があるため、患者の負担が大きく、治療に時間がかかるといった問題がある。
また、ステロイドや免疫抑制剤の経口投与には、全身性の副作用が生じるという問題がある。
結節性痒疹を治療するための外用剤としては、ステロイドの使用が主流であるが、ステロイドは皮膚の萎縮、局所の易感染性、自己ステロイドの生成抑制等の副作用が問題となる。結節性痒疹は、慢性であるため、副作用の少ない薬物の使用が要望される。
特許文献1には、アトピー性皮膚炎再発防止剤として用いられる外用剤として、コンドロイチン多硫酸エステルおよび酸化亜鉛からなる皮膚外用剤が開示されている。
この皮膚外用剤は、実施例にも記載されている通り、まず、ステロイド配合の抗炎症剤でアトピー性皮膚炎患者の治療を行い、皮疹や痒みの症状が改善し、ステロイドの投与量を減量した時期に塗布されるものである。すなわち、単独でアトピー性皮膚炎に効くものではなく、一旦軽減した症状が、再度悪化することを予防するものにすぎない。また、特許文献1には、慢性痒疹に関する開示はない。
特許文献2の段落[0009]および[0010]には、特許文献2の有効成分であるガラクトサミノグリカンは、抗凝固作用が問題となるコンドロイチン硫酸の多硫酸エステル(多硫酸化コンドロイチン硫酸;上記のコンドロイチン多硫酸エステルも同一物質)ではないことが開示されている。
また、特許文献2は、アトピー性皮膚炎モデルマウスにおいて、前記特定のガラクトサミノグリカンが、マウスの掻爬行動の回数を有意に抑制したことを実証するものであるが、結節性痒疹等の慢性痒疹の治療にかかる実施例はない。
特に、慢性痒疹の中でも、結節性痒疹は、症状の進行により、イボのようなぶつぶつした固い芯を形成し、その固い皮膚のため、ステロイド等を含め、従来の皮膚外用剤を用いた治療法では薬物の浸透が十分でなく、治療効果を発揮できない病態に至り、難治性となる。したがって、現在もなお、結節性痒疹のような難治性の慢性痒疹を効果的に治療でき、かつ副作用の少ない皮膚外用剤が望まれていた。
また、多硫酸化コンドロイチン硫酸は、すでに皮膚外用剤の分野で、副作用がほとんどないことが分かっている成分であり、非常に安全性が高い。
多硫酸化コンドロイチン硫酸とは、D−ガラクトサミンとD−グルクロン酸からなる二糖単位あたり、硫酸エステル残基が2〜4個程度、好ましくは2〜3個程度含まれるポリマーである。
物理化学的性質として次の値を示す。
a)硫酸基含量:25.8〜37.3%
b)極限粘度:0.09〜0.18
本発明の外用剤が、ステロイドですら効果を発揮しにくい結節性痒疹に対しても優れた治療効果を発揮する理由は明らかではないが、以下のような理由が考えられる。結節性痒疹は固い皮膚を形成し、治療薬の浸透が十分に届かず、その結果、治療が困難であると考えられるが、本発明に係る外用剤の有効性分である多硫酸化コンドロイチン硫酸は、保湿作用を有するため、皮膚に塗布した場合、その保湿作用により、皮膚を柔らかくし、多硫酸化コンドロイチン硫酸を皮膚の中に浸透させ、かつ、多硫酸化コンドロイチン硫酸自身に、痒疹を改善する抗炎症作用があるため、優れた治療効果を発揮する。
このように、本発明に係る外用剤は、慢性痒疹の中でも、特に難治性であることで知られている結節性痒疹に対してさえ、優れた効果を示す。
患部へは、1日当たり1回〜数回適用する。
また、本発明に係る外用剤は、有効成分が多硫酸化コンドロイチン硫酸のみであっても、慢性痒疹を有意に改善できる。そのため、ステロイドや免疫抑制剤といった、副作用の多い成分を含まないことが好ましい。好ましくは、本発明に係る外用剤は、有効成分として、多硫酸化コンドロイチン硫酸のみを含む。
[実施例1]
ステロイド外用剤(有効成分:クロベタゾールプロピオン酸エステル)およびステロイド内服薬(有効成分:プレドニゾロン)で12ヶ月治療を行っても治癒しない難治性の結節性痒疹患者(成人女性)の四肢の病変部に、多硫酸化コンドロイチン硫酸を含む水中油型乳剤性軟膏(ヒルドイド(登録商標)クリーム0.3%;以下、単にヒルドイドクリームと称する)を塗布する処置を2ヶ月連続して行った。
ステロイド製剤は、結節性痒疹の標準的治療薬であり、ステロイドと多硫酸化コンドロイチン硫酸の併用により、治療効果のさらなる向上が予期されていたため、この結果は驚くべきものであった。
なお、この治療期間中、ヒルドイドクリームの塗布による副作用は観察されなかった。
実施例1と同様に、ステロイド外用剤にて治癒しない難治性の結節性痒疹患者(成人男性)に、ヒルドイドクリームを数ヶ月連続して塗布した。
表1の「副作用」欄は、治療期間中に副作用が観察されない場合を○とし、何らかの副作用が観察された場合を×とする。
表1の「再発」欄は、再発がない場合を○とし、再発が観察された場合を×とする。
Claims (4)
- 多硫酸化コンドロイチン硫酸を有効成分とする、慢性痒疹治療用外用剤。
- 前記慢性痒疹が結節性痒疹である、請求項1に記載の外用剤。
- ステロイドを含まない、請求項1または2に記載の外用剤。
- 有効成分として多硫酸化コンドロイチン硫酸のみを含む、請求項1〜3のいずれか1項に記載の外用剤。
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WO2018230733A1 (ja) * | 2017-06-16 | 2018-12-20 | マルホ株式会社 | 皮膚外用剤 |
JPWO2018230733A1 (ja) * | 2017-06-16 | 2020-07-27 | マルホ株式会社 | 皮膚外用剤 |
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