• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2011 Fiscal Year Annual Research Report

ヒト脳内に存在するニューロメラニン色素の構造とその生成過程の解明

Research Project

Project/Area Number 21500358
Research InstitutionFujita Health University

Principal Investigator

若松 一雅  藤田保健衛生大学, 医療科学部, 教授 (80131259)

Co-Investigator(Kenkyū-buntansha) 伊藤 祥輔  藤田保健衛生大学, 名誉教授 (70121431)
加藤 好光  藤田保健衛生大学, 医療科学部, 准教授 (20121436)
Keywordsニューロメラニン / ユーメラニン / フェオメラニン / ドーパミン / システイニルドーパミン / パーキンソン病 / 黒質 / 化学分析
Research Abstract

ニューロメラニン(NM)の生合成および構造については、まだ未知の部分が多い。今回、DAとCysをさまざまな比率で生理的条件下チロシナーゼ酸化して得られた合成品を用いて、NM生成への酸化の時間経過、およびさまざまな加熱条件下でのNMの生分解を検討した。その結果、NMのベンゾチアジン骨格からベンゾチアゾール骨格への骨格変化が加齢過程(agingprocess)の条件下で生じることを化学分解反応で生成する4-AHPEAとTTCAをHPLC分析することにより証明した。4-AHPEA/PDCA比とTTCA/PDCA比から天然のNMは、DAとCysを2:1比で合成したNMの100℃、8時間加熱したものに近いことがわかった。この研究から得られたメラニン含量は、比色法から11.9%、化学分解法からは3.1-3.5%であり、これらの結果からまだ矛盾することが判明した。比色法の結果は、天然のNM中に加齢を反映するメラニン構造以外にまだ未知の色素が存在することを示唆していた。つづいて、ヒト脳の異なった部位(小脳、脳梁、尾状核、前運動皮質、淡蒼球、青斑核、黒質)から得られた9個のNMを分析したところ、今回初めてNM色素が不溶部分に加えて、1.4-52kDaの分子量でDMSOに可溶な色素が含まれていることを発見した。色素のアミノ酸分析を行ったところ、単離された色素中118.7±36.5μg/mgのアミノ酸を含んでいた。Massスペクトルからこの色素はオリゴマー前駆体からなり、ポリマーの不溶部分に似た組成を有していた。元素分析は色々な脳領域において、異なった組成の比率であるという新しい知見が得られ、NMに3種の別個のタイプがあることがわかった。赤外線スペクトルでは、黒質および青斑核以外の全ての脳領域のNMの間では構造的に著しい相同性が見られた。比較のために、鉄またはタンパク(牛血清アルブミン)を含む合成メラニンを調製し、同じ実験を行った。二次元^1H-^1H-NMR、二次元^1H-^<13>C-NMR、固体^<13>C-NMRおよびHR-MAS (High Resolution Magic Angle Spinning)実験を行ったところ、NM色素の可溶性、不溶性部分の脂質構成成分の有益な情報を得ることができた。光散乱実験ではDMSO可溶部分のtentativeな分子量を測定することができた。

  • Research Products

    (26 results)

All 2012 2011

All Journal Article (12 results) (of which Peer Reviewed: 12 results) Presentation (13 results) Book (1 results)

  • [Journal Article] Oculocutaneous albinism 1 minimal pigment type : a case report on the analysis of genotype of an OCA1MP patient2012

    • Author(s)
      Kono, M., Kondo, T., Ito, S., Suzuki, T., Wakamatsu, K, et al
    • Journal Title

      Br.J.Dermatol.

      Volume: 166 Pages: 896-898

    • DOI

      DOI:10.1111/j.1365-2133.2011.10690.x

    • Peer Reviewed
  • [Journal Article] Withania somnifera extract attenuates stem cell factor-stimulated pigmentation in human epidermal equivalents through interruption of ERK phosphorylation within melanocytes2012

    • Author(s)
      Nakajima, H., Fukazawa, K., Wakabayashi, Y, Wakamatsu, K, et al
    • Journal Title

      J.Nat.Med

      Volume: 66 Pages: 435-446

    • DOI

      DOI:10.1007/s11418-011-011-0604-0

    • Peer Reviewed
  • [Journal Article] Age-dependent changes in eumelanin composition in hairs of various origins2012

    • Author(s)
      Commo, S., Wakamatsu, K., Lozano, I., et al
    • Journal Title

      J.Cosmetic.Sci.

      Volume: 34 Pages: 102-107

    • DOI

      DOI:10.1111/j.1468-2494.2011.00691.x

    • Peer Reviewed
  • [Journal Article] Diversity of human hair pigmentation as studied by chemical analysis of eumelanin and pheomelanin2011

    • Author(s)
      Ito, S., Wakamatsu, K
    • Journal Title

      J.Eur.Acad.Dermatol.Venereol.

      Volume: 25 Pages: 1369-1380

    • DOI

      DOI:10.1111/j.1468-3083.2011.04278.x

    • Peer Reviewed
  • [Journal Article] Usefulness of alkaline hydrogen peroxide oxidation to analyze eumelanin and pheomelanin in various tissue samples : application to chemical analysis of human hair melanins2011

    • Author(s)
      Ito, S., Nakanishi, Y., Valenzuela, R.L., Brilliant, M.H, et al
    • Journal Title

      Pigment Cell Melanoma Res

      Volume: 24 Pages: 605-613

    • DOI

      DOI:10.1111/j.1755-148x.2011.00864.x

    • Peer Reviewed
  • [Journal Article] Maintenance of immune hyporesponsiveness to melanosomal proteins by DHICA-mediated antioxidation : possible implications for autoimmune vitiligo2011

    • Author(s)
      Liu, X-M., Zhou, Q., Xu, S-Z., Wakamatsu, K., et al
    • Journal Title

      Free Radic.Biol.Med.

      Volume: 50 Pages: 1177-1185

    • DOI

      DOI:10.1016/j.freeradbiomed.2011.01.017

    • Peer Reviewed
  • [Journal Article] Melanin-based coloration predicts aggressiveness and boldness in captive eastern Hermann's tortoises2011

    • Author(s)
      Mafli, A., Wakamatsu, K., Roulin, A
    • Journal Title

      Animal Behaviour

      Volume: 81 Pages: 859-863

    • DOI

      DOI:10.1016/j.anbehav.2011.01.025

    • Peer Reviewed
  • [Journal Article] An extract of Melia toosendan attenuates endothelin-1-stimulated pigmentation in human epidermal equivalents through the interruption of PKC activity with melanocytes2011

    • Author(s)
      Nakajima, H., Wakabayashi, Y., Wakamatsu, K., Imokawa, G.
    • Journal Title

      Arch Dermatol Res

      Volume: 303 Pages: 263-276

    • DOI

      DOI:10.1007/s00403-011-1143-y

    • Peer Reviewed
  • [Journal Article] An extract of withania somnifera attenuates endothelin-1-stimulated pigmentation in human epidermal equivalents through the interruption of PKC activity within melanocytes2011

    • Author(s)
      Nakajima, H., Wakabayashi, Y., Wakamatsu, K., Imokawa, G.
    • Journal Title

      Phytother.Res

      Volume: 25 Pages: 1398-1411

    • DOI

      DOI:10.1002/ptr.3552,2011

    • Peer Reviewed
  • [Journal Article] Inactivation of Pmel alters melanosome shape but has only a subtle effect on visible pigmentation2011

    • Author(s)
      Hellstrom, A.R., Watt, B., Fard, S.S., Tenza, D., et al
    • Journal Title

      Plos Genetics

      Volume: 7 Pages: e1002285

    • DOI

      DOI:10.1371/journal.pgen.1002285

    • Peer Reviewed
  • [Journal Article] A novel deletion mutation of mouse ruby-eye 2 named ru2^d/Hps5^<ru2-d> in hibits melanocyte differentiation and its impaired differentiation is rescued by L-tyrosine2011

    • Author(s)
      Hirobe, T., Yoshihara, C, Takeuchi, S., Wakamatsu, K., et al
    • Journal Title

      Zoological Sci.

      Volume: 28 Pages: 790-801

    • DOI

      DOI:10.2108/zsj.28.790

    • Peer Reviewed
  • [Journal Article] 1-(2,4-Dihydroxyphenyl)-3-(2,4-dimethoxy-3-methylphenyl) propane inhibits melanin synthesis by dual mechanism2011

    • Author(s)
      Niki, Y., Yoshida, M., Ando, H., Wakamatsu, K., et al
    • Journal Title

      J.Dermatol.Sci.

      Volume: 63 Pages: 115-121

    • DOI

      DOI:10.1016/j.jdermsci.2011.04.002

    • Peer Reviewed
  • [Presentation] Development and evaluation of antitumor effect of novel NPrCAP-magnetite nanoparticles for chemo-thermo-immunotherapy in malignant melanoma2011

    • Author(s)
      Yoneda, A., Tamura, Y., Nohara, A., Ito, A., Honda, H., et al
    • Organizer
      XX1st International Pigment Cell Conference
    • Place of Presentation
      Bordeaux, France
    • Year and Date
      20110921-20110924
  • [Presentation] Human hair pigmentation characteristics revealed by melanin determination m human eumelanic hairs of various ethnic origins2011

    • Author(s)
      Y.Ishii-Osai, T.Yamashita, M.Okura, Y.Tamura, et al
    • Organizer
      XX1st International Pigment Cell Conference
    • Place of Presentation
      Bordeaux, France
    • Year and Date
      20110921-20110924
  • [Presentation] A novel pathway for regulation of pigmentation by glutamate receptor mGluR6 through its action on TRPM12011

    • Author(s)
      S.Devi, Y.Markandeya, N.Maddodi, K.Wakamatsu, et al
    • Organizer
      XX1st International Pigment Cell Conference
    • Place of Presentation
      Bordeaux, France
    • Year and Date
      20110921-20110924
  • [Presentation] Slaty mutation inverses the ratio of DHI to DHICA content of eumelanin in both mouse melanocytes and hair2011

    • Author(s)
      Y.Niki, T.Hirobe, K.Wakamatsu, H.Ando, et al
    • Organizer
      XX1st International Pigment Cell Conference
    • Place of Presentation
      Bordeaux, France
    • Year and Date
      20110921-20110924
  • [Presentation] Oculocutaneous albinism 1 minimal pigment type ; a case report on the analysis of genotype-phenotype correlation2011

    • Author(s)
      M.Kono, T.Kondo, S.Ito, T.Suzuki, K.Wakamatsu, et al
    • Organizer
      XX1st International Pigment Cell Conference
    • Place of Presentation
      Bordeaux, France
    • Year and Date
      20110921-20110924
  • [Presentation] Serum 5-S-cysteinyldopa levels in psoriasis and vitiligo patients undergoing narrowband ultraviolet B phototherapy2011

    • Author(s)
      K.Kikuchi, K.Wakamatsu, Y.Tada, S.Ito
    • Organizer
      XX1st International Pigment Cell Conference
    • Place of Presentation
      Bordeaux, France
    • Year and Date
      20110921-20110924
  • [Presentation] Neuromelanins in brain aging and Parkinson's disease2011

    • Author(s)
      Zecca, L., Zhang, W., Jackson-Lewis, S., Przedborski, S., et al
    • Organizer
      XX1st International Pigment Cell Conference
    • Place of Presentation
      Bordeaux, France
    • Year and Date
      2011-09-23
  • [Presentation] Introduction of melanoma in situ peptide vaccine by chemotherapy through exploitation of melanogenesis substrate, NPrCAP, and its conjugation with magnetite nanoparticles2011

    • Author(s)
      Jimbow, K., Yoneda, A., Tamura, Y., Osai, Y., Sato, M., et al
    • Organizer
      XX1st International Pigment Cell Conference
    • Place of Presentation
      Bordeaux, France
    • Year and Date
      2011-09-22
  • [Presentation] N-Propionyl-4-S-Cysteaminylphenol generates reactive oxygen species and mediates apoptosis in pigmented melanoma cells2011

    • Author(s)
      S.Commo, K.Wakamatsu, S.Ito
    • Organizer
      XX1st International Pigment Cell Conference
    • Place of Presentation
      Bordeaux, France
    • Year and Date
      2011-09-22
  • [Presentation] Distribution patterns of eumelanin and pheomelanin in human skin2011

    • Author(s)
      S.G.Coelho, S.Ito, K.Wakamatsu, et al
    • Organizer
      XX1st International Pigment Cell Conference
    • Place of Presentation
      Bordeaux, France
    • Year and Date
      2011-09-22
  • [Presentation] Chemistry and Biophysics of neuromelanin2011

    • Author(s)
      Wakamatsu, K., Murase, T., Zucca, F.A., Zecca, L. Ito, S.
    • Organizer
      XX1st International Pigment Cell Conference
    • Place of Presentation
      Bordeaux, France(招待講演)
    • Year and Date
      2011-09-21
  • [Presentation] Evaluation of alkaline hydrogen peroxide oxidation to analyze eumelanin and pheomelanin2011

    • Author(s)
      Ito, S., Nakanishi, Y., Wakamatsu, K
    • Organizer
      XX1st International Pigment Cell Conference
    • Place of Presentation
      Bordeaux, France
    • Year and Date
      2011-09-21
  • [Presentation] Quantum chemical study of 5,6-dihydroxyindole tetramers as eumelanin model molecules2011

    • Author(s)
      H.Okuda, T.Sota, K.Koike, K.Monda, T.Nakamura, et al
    • Organizer
      XX1st International Pigment Cell Conference
    • Place of Presentation
      Bordeaux, France
    • Year and Date
      2011-09-21
  • [Book] Structure of Melanins : Melanins and Melanosomes2011

    • Author(s)
      Ito, S, Wakamatsu, K(共著)
    • Total Pages
      407
    • Publisher
      Wiley-Blackwell

URL: 

Published: 2013-06-26  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi