World's Best Scientists 2026 revealed!
Fumikazu Okajima

Fumikazu Okajima

D-Index & Metrics

Biology and Biochemistry

D-Index
71
Citations
14295
World Ranking
6799
National Ranking
455

Fumikazu Okajima publication distribution in Biology and Biochemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Biology and Biochemistry in 2026. The highlighted bar marks where Fumikazu Okajima sits on this spectrum.

47–56 publications: 8 scientists 57–66 publications: 35 scientists 67–76 publications: 106 scientists 77–86 publications: 231 scientists 87–96 publications: 414 scientists 97–106 publications: 546 scientists 107–116 publications: 704 scientists 117–126 publications: 849 scientists 127–136 publications: 980 scientists 137–146 publications: 942 scientists 147–156 publications: 969 scientists 157–166 publications: 950 scientists 167–176 publications: 951 scientists 177–186 publications: 915 scientists 187–196 publications: 787 scientists 197–206 publications: 841 scientists 207–216 publications: 735 scientists 217–226 publications: 709 scientists 227–236 publications: 651 scientists 237–246 publications: 605 scientists 247–256 publications: 510 scientists 257–266 publications: 524 scientists 267–276 publications: 434 scientists 277–286 publications: 418 scientists 287–296 publications: 350 scientists 297–306 publications: 363 scientists 307–316 publications: 315 scientists 317–326 publications: 296 scientists 327–336 publications: 261 scientists 337–346 publications: 240 scientists 347–356 publications: 219 scientists 357–366 publications: 197 scientists 367–376 publications: 154 scientists 377–386 publications: 161 scientists 387–396 publications: 155 scientists 397–406 publications: 145 scientists 407–416 publications: 124 scientists 417–426 publications: 112 scientists 427–436 publications: 132 scientists 437–446 publications: 116 scientists 447–456 publications: 99 scientists 457–466 publications: 81 scientists 467–476 publications: 91 scientists 477–486 publications: 80 scientists 487–496 publications: 80 scientists 497–506 publications: 60 scientists 507–516 publications: 36 scientists 517–526 publications: 46 scientists 527–536 publications: 54 scientists 537–546 publications: 44 scientists 547–556 publications: 43 scientists 557–566 publications: 43 scientists 567–576 publications: 42 scientists 577–586 publications: 25 scientists 587–596 publications: 34 scientists 597–606 publications: 23 scientists 607–616 publications: 33 scientists 617–626 publications: 31 scientists 627–636 publications: 27 scientists 637–646 publications: 25 scientists 647–656 publications: 28 scientists 657–666 publications: 34 scientists 667–676 publications: 18 scientists 677–686 publications: 16 scientists 687–696 publications: 10 scientists 697–706 publications: 12 scientists 707–716 publications: 21 scientists 717–726 publications: 12 scientists 727–736 publications: 12 scientists 737–746 publications: 10 scientists 747–756 publications: 7 scientists 757–766 publications: 13 scientists 767–776 publications: 15 scientists 777–786 publications: 13 scientists 787–796 publications: 9 scientists 797–806 publications: 9 scientists 807–816 publications: 7 scientists 817–826 publications: 4 scientists 827–836 publications: 9 scientists 837–846 publications: 7 scientists 847–856 publications: 3 scientists 857–866 publications: 5 scientists 867–876 publications: 5 scientists 877–886 publications: 11 scientists 887–896 publications: 3 scientists 897–906 publications: 4 scientists 907–916 publications: 7 scientists 917–926 publications: 5 scientists 927–936 publications: 6 scientists 937–946 publications: 6 scientists 947–956 publications: 3 scientists 957–966 publications: 7 scientists 967–976 publications: 2 scientists 977–986 publications: 2 scientists 987–996 publications: 1 scientists 997–1,006 publications: 5 scientists 1,007–1,016 publications: 2 scientists 1,017–1,026 publications: 2 scientists 1,027 publications: 1 scientists 1,028+ publications: 100 scientists
47 publications 1,028+

This scientist: 221 publications — 58th percentile

58% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,028 publications or more.

Fumikazu Okajima D-index placement in Biology and Biochemistry in 2026

The chart shows the D-index (discipline H-index) distribution of Biology and Biochemistry scientists ranked by Research.com in 2026. The highlighted bar marks where Fumikazu Okajima sits on this spectrum.

40–41 D-Index: 80 scientists 42–43 D-Index: 183 scientists 44–45 D-Index: 317 scientists 46–47 D-Index: 504 scientists 48–49 D-Index: 718 scientists 50–51 D-Index: 900 scientists 52–53 D-Index: 1,026 scientists 54–55 D-Index: 1,150 scientists 56–57 D-Index: 1,236 scientists 58–59 D-Index: 1,253 scientists 60–61 D-Index: 1,163 scientists 62–63 D-Index: 1,131 scientists 64–65 D-Index: 1,032 scientists 66–67 D-Index: 897 scientists 68–69 D-Index: 814 scientists 70–71 D-Index: 715 scientists 72–73 D-Index: 709 scientists 74–75 D-Index: 596 scientists 76–77 D-Index: 512 scientists 78–79 D-Index: 473 scientists 80–81 D-Index: 412 scientists 82–83 D-Index: 373 scientists 84–85 D-Index: 358 scientists 86–87 D-Index: 285 scientists 88–89 D-Index: 273 scientists 90–91 D-Index: 227 scientists 92–93 D-Index: 208 scientists 94–95 D-Index: 193 scientists 96–97 D-Index: 153 scientists 98–99 D-Index: 157 scientists 100–101 D-Index: 148 scientists 102–103 D-Index: 120 scientists 104–105 D-Index: 113 scientists 106–107 D-Index: 100 scientists 108–109 D-Index: 86 scientists 110–111 D-Index: 67 scientists 112–113 D-Index: 72 scientists 114–115 D-Index: 73 scientists 116–117 D-Index: 64 scientists 118–119 D-Index: 53 scientists 120–121 D-Index: 60 scientists 122–123 D-Index: 54 scientists 124–125 D-Index: 43 scientists 126–127 D-Index: 38 scientists 128–129 D-Index: 49 scientists 130–131 D-Index: 26 scientists 132–133 D-Index: 18 scientists 134–135 D-Index: 23 scientists 136–137 D-Index: 32 scientists 138–139 D-Index: 32 scientists 140–141 D-Index: 27 scientists 142–143 D-Index: 19 scientists 144–145 D-Index: 22 scientists 146–147 D-Index: 12 scientists 148–149 D-Index: 16 scientists 150–151 D-Index: 14 scientists 152–153 D-Index: 10 scientists 154–155 D-Index: 13 scientists 156–157 D-Index: 10 scientists 158–159 D-Index: 7 scientists 160–161 D-Index: 9 scientists 162–163 D-Index: 13 scientists 164–165 D-Index: 4 scientists 166 D-Index: 4 scientists 167+ D-Index: 98 scientists
40 D-Index 167+

This scientist: 71 D-Index — 67th percentile

67% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 167 D-Index or more.

Overview

Fumikazu Okajima is affiliated with Aomori University in Japan and has contributed significantly to research primarily in the fields of Medicine and Biochemistry, Genetics, and Molecular Biology. Their work spans several specialized subfields including Molecular Biology, Physiology, Rheumatology, Immunology and Allergy, and Endocrinology, Diabetes and Metabolism.

The scientist's research covers a diverse array of topics, with a focus on mechanisms underlying neuroinflammation and neurodegeneration, sphingolipid metabolism and signaling, nitric oxide and endothelin effects, bone and dental protein studies, cell adhesion molecules, metabolism related to diabetes and cancer, and the regulation of growth hormone and insulin-like growth factors.

Fumikazu Okajima has authored several recent papers, detailing findings in various biomedical areas. Notable publications include:

  • The protective role of proton-sensing TDAG8 in the brain injury in a mouse ischemia reperfusion model, 2020, Scientific Reports
  • A missense mutation of Leu74Pro of OGR1 found in familial amelogenesis imperfecta actually causes the loss of the pH-sensing mechanism, 2020, Biochemical and Biophysical Research Communications
  • Involvement of GPR4 in increased growth hormone and prolactin expressions by extracellular acidification in MtT/S cells, 2020, Journal of Reproduction and Development
  • Salvianolic Acid A Suppresses DNCB-Induced Atopic Dermatitis-Like Symptoms in BALB/c Mice, 2021, Evidence-based Complementary and Alternative Medicine
  • Metal-Stimulated Interleukin-6 Production Through a Proton-Sensing Receptor, Ovarian Cancer G Protein-Coupled Receptor 1, in Human Bronchial Smooth Muscle Cells: A Response Inhibited by Dexamethasone, 2021, Journal of Inflammation Research

The venues where these works were published include Scientific Reports, Biochemical and Biophysical Research Communications, Journal of Reproduction and Development, Evidence-based Complementary and Alternative Medicine, and Journal of Inflammation Research.

Throughout their career, Okajima has collaborated extensively with several researchers. Frequent coauthors include Kōichi Sato, Chihiro Mogi, Hideaki Tomura, Dong-Soon Im, and Shiori Musha, with several joint publications documented.

Best Publications

  • Interaction of sphingosine 1-phosphate with plasma components, including lipoproteins, regulates the lipid receptor-mediated actions.

    Naoya Murata;Koichi Sato;Junko Kon;Hideaki Tomura

  • Reactive astrocytes function as phagocytes after brain ischemia via ABCA1-mediated pathway

    Yosuke M. Morizawa;Yosuke M. Morizawa;Yuri Hirayama;Noubuhiko Ohno;Shinsuke Shibata

  • Ki16425, a Subtype-Selective Antagonist for EDG-Family Lysophosphatidic Acid Receptors

    Hideo Ohta;Koichi Sato;Naoya Murata;Alatangaole Damirin

  • Sphingosine 1-Phosphate May Be a Major Component of Plasma Lipoproteins Responsible for the Cytoprotective Actions in Human Umbilical Vein Endothelial Cells

    Takao Kimura;Koichi Sato;Atsushi Kuwabara;Hideaki Tomura

  • Coupling of the guanine nucleotide regulatory protein to chemotactic peptide receptors in neutrophil membranes and its uncoupling by islet-activating protein, pertussis toxin. A possible role of the toxin substrate in Ca2+-mobilizing receptor-mediated signal transduction.

    F Okajima;T Katada;M Ui

  • Plasma lipoproteins behave as carriers of extracellular sphingosine 1-phosphate: is this an atherogenic mediator or an anti-atherogenic mediator?

    Fumikazu Okajima

  • Comparison of Intrinsic Activities of the Putative Sphingosine 1-Phosphate Receptor Subtypes to Regulate Several Signaling Pathways in Their cDNA-transfected Chinese Hamster Ovary Cells

    Junko Kon;Koichi Sato;Tomoko Watanabe;Hideaki Tomura

  • Inhibition by islet-activating protein of a chemotactic peptide-induced early breakdown of inositol phospholipids and Ca2+ mobilization in guinea pig neutrophils.

    H Ohta;F Okajima;M Ui

  • TDAG8 Is a Proton-sensing and Psychosine-sensitive G-protein-coupled Receptor

    Ju-Qiang Wang;Junko Kon;Chihiro Mogi;Masayuki Tobo

  • P2-purinergic receptors are coupled to two signal transduction systems leading to inhibition of cAMP generation and to production of inositol trisphosphate in rat hepatocytes.

    F Okajima;Y Tokumitsu;Y Kondo;M Ui

  • Sphingosine 1-phosphate stimulates proliferation and migration of human endothelial cells possibly through the lipid receptors, Edg-1 and Edg-3.

    Takao Kimura;Tomoko Watanabe;Koichi Sato;Junko Kon

  • High-Density Lipoprotein Stimulates Endothelial Cell Migration and Survival Through Sphingosine 1-Phosphate and Its Receptors

    Takao Kimura;Koichi Sato;Enkhzol Malchinkhuu;Hideaki Tomura

  • Role of scavenger receptor class B type I and sphingosine 1-phosphate receptors in high density lipoprotein-induced inhibition of adhesion molecule expression in endothelial cells.

    Takao Kimura;Hideaki Tomura;Chihiro Mogi;Atsushi Kuwabara

  • Proton-sensing and lysolipid-sensitive G-protein-coupled receptors: a novel type of multi-functional receptors.

    Hideaki Tomura;Chihiro Mogi;Koichi Sato;Fumikazu Okajima

  • Critical role of ABCA1 transporter in sphingosine 1-phosphate release from astrocytes.

    Koichi Sato;Enkhzol Malchinkhuu;Yuta Horiuchi;Chihiro Mogi

  • Resolvin E1 dampens airway inflammation and hyperresponsiveness in a murine model of asthma.

    Haruka Aoki;Takeshi Hisada;Tamotsu Ishizuka;Mitsuyoshi Utsugi

  • Regulation of inflammation by extracellular acidification and proton-sensing GPCRs.

    Fumikazu Okajima

  • Lysophosphatidic Acid (LPA) in Malignant Ascites Stimulates Motility of Human Pancreatic Cancer Cells through LPA1

    Takayuki Yamada;Koichi Sato;Mayumi Komachi;Enkhzol Malchinkhuu

  • Edg-6 as a putative sphingosine 1-phosphate receptor coupling to Ca(2+) signaling pathway.

    Yuji Yamazaki;Junko Kon;Koichi Sato;Hideaki Tomura

  • Involvement of proton-sensing TDAG8 in extracellular acidification-induced inhibition of proinflammatory cytokine production in peritoneal macrophages.

    Chihiro Mogi;Masayuki Tobo;Hideaki Tomura;Naoya Murata

Frequent Co-Authors

Koichi Sato
Koichi Sato Gunma University
Hideaki Tomura
Hideaki Tomura Meiji University
Hitoshi Kurose
Hitoshi Kurose University of Tokushima
Michio Ui
Michio Ui Tokyo Metropolitan Institute of Medical Science
Masatomo Mori
Masatomo Mori Gunma University
Hae Young Chung
Hae Young Chung Pusan National University
Ryozo Nagai
Ryozo Nagai Jichi Medical University
Masahiko Kurabayashi
Masahiko Kurabayashi Gunma University
Toshiaki Katada
Toshiaki Katada Musashino University
Leonard D. Kohn
Leonard D. Kohn National Institutes of Health

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