JP7126116B2 - 濾胞性制御性t細胞増加剤 - Google Patents
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- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change
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Description
前記Tfr細胞増加剤は、前記乳酸菌がラクトバチルス・パラカゼイ(Lactobacillus paracasei)であることを好ましい態様としている。
また前記Tfr細胞増加剤は、前記乳酸菌がラクトバチルス・パラカゼイMCC1849(NITE BP-01633)であることを好ましい態様としている。
また前記Tfr細胞増加剤は、血液中の濾胞性ヘルパーT細胞(Tfh細胞)が過剰に増加した対象に投与されることを好ましい態様としている。
また前記Tfr細胞増加剤は、前記乳酸菌が乳酸菌の生菌及び/又は乳酸菌の死菌であることを好ましい態様としている。
さらに、本発明は、ラクトバチルス属に属する乳酸菌を有効成分とする濾胞性制御性T細胞増加用飲食品組成物を提供する。
本発明のTfr細胞増加剤は、乳酸菌を有効成分とする。乳酸菌としては、例えば、ラクトバチルス(Lactobacillus)属、ロイコノストック(Leuconostoc)属、ストレプトコッカス(Streptococcus)属、ペディオコッカス(Pediococcus)属、メリソコッカス(Melissococcus)属、エンテロコッカス(Enterococcus)属、トリココッカス(Trichococcus)属、ラクトコッカス(Lactococcus)属、カルノバクテリウム(Carnobacterium)属、
バゴコッカス(Vagococcus)属、テトラゲノコッカス(Tetragenococcus)属、アトポビウム(Atopobium)属、ワイセラ(Weissella)属、オエノコッカス(Oenococcus)属、アビオトロフィア(Abiotrophia)属、デスメジア(Desemzia)属、パララクトバチルス(Paralactobacillus)属、グラヌリカテラ(Granulicatella)属、アルカリバクテリウム(Alkalibacterium)属、オルセネラ(Olsenella)属、イソバキュラム(Isobaculum)属、マリニラクチバチルス(Marinilactibacillus)属、アトポスタイペス(Atopostipes)属、ラクトバム(Lactovum)属、ピリバクター(Pilibacter)属、フルクトバチルス(Fructobacillus)属、ラクチシゲミウム(Lacticigemium)属、ババリコッカス(Bavariicoccus)属、ビフィドバクテリウム(Bifidobacterium)属等に属する乳酸菌が好ましく、ラクトバチルス属がより好ましい。
farciminis、Lactobacillus farraginis、Lactobacillus fermentum、Lactobacillus fornicalis、Lactobacillus fructivorans、Lactobacillus frumenti、Lactobacillus fuchuensis、Lactobacillus gallinarum、Lactobacillus gasseri、Lactobacillus gastricus、Lactobacillus ghanensis、Lactobacillus graminis、Lactobacillus hammesii、Lactobacillus hamsteri、Lactobacillus harbinensis、Lactobacillus hayakitensis、Lactobacillus helveticus、Lactobacillus hilgardii、Lactobacillus homohiochii、Lactobacillus hordei、Lactobacillus iners、Lactobacillus ingluviei、Lactobacillus intestinalis、Lactobacillus jensenii、Lactobacillus johnsonii、Lactobacillus kalixensis、Lactobacillus kefiranofaciens、Lactobacillus kefiri、Lactobacillus kimchii、Lactobacillus kisonensis、Lactobacillus kitasatonis、Lactobacillus kunkeei、Lactobacillus leichmannii、Lactobacillus lindneri、Lactobacillus malefermentans、Lactobacillus mali、Lactobacillus manihotivorans、Lactobacillus mindensis、Lactobacillus mucosae、Lactobacillus murinus、Lactobacillus nagelii、Lactobacillus namurensis、Lactobacillus nantensis、Lactobacillus nodensis、Lactobacillus oligofermentans、Lactobacillus oris、Lactobacillus otakiensis、Lactobacillus panis、Lactobacillus pantheris、Lactobacillus parabrevis、Lactobacillus parabuchneri、Lactobacillus paracollinoides、Lactobacillus parafarraginis、Lactobacillus parakefiri、Lactobacillus paralimentarius、Lactobacillus paraplantarum、Lactobacillus pentosus、Lactobacillus perolens、Lactobacillus plantarum、Lactobacillus pontis、Lactobacillus psittaci、Lactobacillus rapi、Lactobacillus rennini、Lactobacillus reuteri、Lactobacillus rhamnosus、Lactobacillus rimae、Lactobacillus rossiae、Lactobacillus ruminis、Lactobacillus saerimneri、Lactobacillus sakei、Lactobacillus salivarius、Lactobacillus sanfranciscensis、Lactobacillus satsumensis、Lactobacill
us secaliphilus、Lactobacillus senmaizukei、Lactobacillus sharpeae、Lactobacillus siliginis、Lactobacillus spicheri、Lactobacillus suebicus、Lactobacillus sunkii、Lactobacillus susicola、Lactobacillus taiwanensis、Lactobacillus thailandensis、Lactobacillus tucceti、Lactobacillus ultunensis、Lactobacillus uvarum、Lactobacillus vaccinostercus、Lactobacillus vaginalis、Lactobacillus versmoldensis、Lactobacillus vini、Lactobacillus vitulinus、Lactobacillus zeae、Lactobacillus zymae等が好ましく、ラクトバチルス・パラカゼイMCC1849(NITE BP-01633)(以下、「MCC1849」として略記することがある。)、及び、MCC1849と実質的に同等の細菌がより好ましい。以下、本明細書においては、ラクトバチルス属に属する乳酸菌を、単に乳酸菌と記載することがある。
MCC1849は、ヒト糞便を分離源として分離された菌株である。同菌株の菌学的性質は、後述の実施例1に示す。同菌株は、2013年6月6日に、独立行政法人製品評価技術基盤機構特許微生物寄託センター(〒292-0818 千葉県木更津市かずさ鎌足2-5-8 122号室)に、NITE P-01633の受託番号で寄託され、2013年12月19日にブダペスト条約に基づく国際寄託に移管され、NITE BP-01633の受託番号が付与されている。
は、生菌であっても死菌であってもよく、生菌及び死菌の両方であってもよい。死菌は、死菌体の破砕物であってもよい。
MCC1849等の乳酸菌、又はこれを有効成分として含有する本発明のTfr細胞増加剤を含む組成物は、医薬、飲食品、飲食品組成物又は飼料として広く用いることができる。たとえば、ラクトバチルス属に属する乳酸菌を有効成分とするTfr細胞増加用医薬、Tfr細胞増加用飲食品組成物、又はTfr細胞増加用飼料を提供することができる。
ここで「Tfh細胞が過剰に増加している」状態とは、健常者を基準にして血液中のTfh細
胞数が過剰に増加していることが好ましく、具体的には、健常者の血液中のTfh細胞数に対して2倍以上増加していることがより好ましい。血液としては、例として末梢血が挙げられるが、これに限定されない。
尚、ラクトバチルス・パラカゼイは、IL-12産生誘導能を有することが知られているが(国際公開2012/133827号)、本発明のTfr細胞増加剤は、IL-12産生促進を目的とする用途を除くことが好ましい。また、ラクトバチルス・パラカゼイは、Tfh細胞増加作用を有することが知られているが(特許文献1)、本発明のTfr細胞増加剤は、Tfh細胞増加を目的とする用途を除くことが好ましい。
食品又は飲料の原料としては、通常の飲料や食品に用いられている原料を使用することができる。製造された飲食品等は、経口的に摂取することが可能である。
MCC1849は、ヒト糞便サンプルから分離した。同細菌の菌学的性質として、細胞の形態、運動性、胞子形成、グラム染色性、カタラーゼ、グルコースからのガスの産生、及び、糖の発酵性を表1に示す。糖の発酵性は、細菌同定キットAPI 50CH(シスメックス・ビオ
メリュー社)を用いて調べた。キットに付属のマニュアル記載の方法にしたがって一晩培養後の菌液を各基質を含む培地に接種し、これを37℃のインキュベーターで培養し、培養1日目および2日目に各基質の糖発酵性状を評価した。
これらの菌学的性質を表1に示す。この結果から、MCC1849はラクトバチルス・パラカゼイと判定された。
ラカゼイまたはラクトバチルス・カゼイであると判断された。ラクトバチルス・パラカゼイとラクトバチルス・カゼイは近縁種であり、標準株間の16S rRNA遺伝子塩基配列の相同性は99%以上であることが示されている(Huang CH, and Lee FL., Antonie Van Leeuwenhoek, 2011, 99(2):319-27)。MCC1849のゲノム配列を決定し、リードをラクトバチルス・パラカゼイ標準株(ATCC25302)またはラクトバチルス・カゼイ標準株(ATCC393)をリファレンスゲノムとしてマッピングすることで相同性を確認した。
したがって、MCC1849はラクトバチルス・パラカゼイであることが確認された。
(1)MCC1849加熱殺菌体の調製
MCC1849をMRS(de Man Rogasa Sharpe)培地(Difco)で16時間培養した菌体を、PBSで2回洗浄し、さらに蒸留水で1回洗浄した後に蒸留水に懸濁し、100℃30分間の加熱処理を行った。加熱処理後、菌体を蒸留水で2回洗浄した後に蒸留水に懸濁し、凍結乾燥を行い、MCC1849加熱殺菌体とした。
BALB/cA Jcl マウス(日本クレアより入手)由来パイエル板(PP)細胞に1×108 cellsあたり475 μLのMACSバッファーおよび25 μLのCD11c MicroBeads, mouse(ミルテニーバイオテク)を加えて懸濁した後、氷上で15 min静置し、MACSバッファーを加えて遠心(4℃、400 G、5 min)して上清ごとCD11c Beadsを除去した。そのあと細胞をMACSバッファーで再度懸濁し、付属のプロトコルに従いMACS LS分離カラム(ミルテニーバイオテク)に細胞懸濁液を通して一度目の精製を行った。この粗精製細胞をMACS MS分離カラム(ミルテニーバイオテク)に通して二度目の精製を行うことでCD11c+細胞を精製した。これをPP DCとして用いた。
DO11.10マウス由来脾臓 (SPL)細胞に1×107 cellsあたり45 μLのMACSバッファーおよび5 μLのCD4 MicroBeads, mouse(ミルテニーバイオテク)を加えて懸濁した後、氷上で15 min静置し、MACSバッファーを加えて遠心(4℃、400 G、5 min)して上清ごとCD4 MicroBeadsを除去した。そのあと細胞をMACS LS分離カラム(ミルテニーバイオテク)に細胞懸濁液を通してCD4+細胞を精製した。これをCD4+ T細胞として用いた。
BALB/cマウス由来SPL細胞に1×108 cellsあたり2500 μLのMACSバッファーおよび5 μLのビオチン化ラット抗マウスIgM抗体を加えて懸濁した後、氷上で15 min静置し、MACSバッファーを加えて遠心(4℃、400 G、5 min)して上清ごとビオチン化ラット抗マウスIgM抗体を除去した。その後1×108 cellsあたり980 μLのMACSバッファーおよび20 μLのStreptavidin MicroBeads, mouse(ミルテニーバイオテク)を加えて懸濁した後、氷上で15 min静置し、MACSバッファーを加えて遠心(4℃、400 G、5 min)して上清ごとStreptavidin MicroBeadsを除去した。そのあと細胞をMACS LS分離カラム(ミルテニーバイオテク)に細胞懸濁液を通してIgM+細胞を精製した。これをSPL B細胞として用いた。
96 well 平底プレート(BD FalconTM)を用いて、5% FCS-RPMI 200 μL中にDC、T細胞、B細胞を、それぞれ1×104cells、2×105 cells、2.5×105cellsとなるように細胞溶液を加えた。OVA 323-339に相当する抗原ペプチド(OVAp; 終濃度10 nM)を 5% FCS-RPMIに
懸濁し添加した。加熱死菌体はPBSに懸濁して終濃度100 μg/mLにて、またアジュバントであるCpGオリゴDNA(CpG ODN 1668; CpG)は10 nMにて添加した。37℃、5% CO2の環境下で培養した。
細胞懸濁液を1×105-2×106cells程度ポリスチレンラウンドチューブに添加しFACSバッファーを加えて遠心(4℃、400 G、5分)し、上清を除去することで洗浄した。以下、洗浄及び希釈には全てFACSバッファーを使用した。抗マウスCD16/32抗体(2.4G2, BioLegend)を2.5 μg/mLの濃度で懸濁し、氷上で15分、Fcレセプターのブロックを行った。洗浄を行い、蛍光標識抗体、およびbiotin化抗体を希釈して懸濁し、氷上で20分反応させた。洗浄を行った後、蛍光標識ストレプトアビジンを希釈して懸濁し、氷上で20分反応させた。細胞内分子の染色を行わない場合は洗浄を行った後、ヨウ化プロピジウムを加えて懸濁した直後に洗浄し、これらのサンプルにFACSバッファーを加えてフローサイトメトリーに使用した。Foxp3の染色は、Foxp3 Staining Buffer Set (eBioscience) を用い、付属のプロトコルに従った。測定にはFACS Verse (BD Biosciences) を使用し、データの解析はFlowJo (Tree Star, Inc.) にて行った。
なお、抗体、蛍光試薬は以下のものを使用した。
FITC標識抗マウスCD4抗体(H129.19, BD Pharmingen)
allophycocyanin (APC) 標識抗マウスCD4抗体(GK1.5, BioLegend)
PerCP-efluor710標識抗マウスCD279/PD-1抗体(J43, ebioscience)
biotin化抗マウスCD185/CXCR5抗体(SPRCL5, ebioscience)
biotin化抗マウスCD11c抗体(N418, Cytotechnology(2011),vol.63,p.307-317に記載された抗体であり、市販されているものと同等のものである。)
biotin化抗マウスCD279/PD-1抗体(J43, ebioscience)
PE-cy7標識streptavidin (BioLegend)
APC標識streptavidin (BioLegend)
PE標識抗マウスFoxp3抗体(FJK-16s, ebioscience)
*印は両群間の統計学的危険率が5%以下であることを示す。また、統計的有意差の検定にはTukey HSDを用い、p<0.05を統計的有意差とみなした。
図1に示すように、CpG存在下においてMCC1849加熱殺菌体を添加することによって、CD4+CXCR5+PD-1highFoxp3+細胞 (Tfr細胞)の割合は有意に増加した。また本実験では、CpG非存在下においても、Tfr細胞の割合は有意に増加した。尚、図中のバーは平均値を示す。
この結果から、乳酸菌ラクトバチルス・パラカゼイMCC1849はTfr細胞を増加させる効果を有することが示された。
Claims (4)
- 乳酸菌ラクトバチルス・パラカゼイMCC1849(NITE BP-01633)を有効成分とする濾胞性制御性T細胞増加剤。
- 血液中の濾胞性ヘルパーT細胞が過剰に増加した対象に投与される、請求項1に記載の濾胞性制御性T細胞増加剤。
- 前記乳酸菌が乳酸菌の生菌及び/又は乳酸菌の死菌である、請求項1又は2に記載の濾胞性制御性T細胞増加剤。
- 乳酸菌ラクトバチルス・パラカゼイMCC1849(NITE BP-01633)を有効成分とする濾胞性制御性T細胞増加用飲食品組成物。
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