World's Best Scientists 2026 revealed!
Hiroshi Okamoto

Hiroshi Okamoto

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Biology and Biochemistry 66 8793 8111 594 559 176 13654

Hiroshi Okamoto publications per year

The chart shows the history of publications by Hiroshi Okamoto between 1958 and 2026, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Hiroshi Okamoto published across 69 years, from 1958 to 2026, averaging 3.2 papers a year. Output peaked at 11 publications in 1995. 11 of the 223 publications appeared in the last two years.

No. of publications
2 4 6 8 10
Bar chart. Horizontal axis: year, 1958 to 2026. Vertical axis: number of publications, 0 to 11. Peak 11 publications in 1995. 1958: 2 publications 1959: 1 publication 1960: 0 publications 1961: 0 publications 1962: 0 publications 1963: 0 publications 1964: 0 publications 1965: 0 publications 1966: 1 publication 1967: 3 publications 1968: 1 publication 1969: 1 publication 1970: 1 publication 1971: 3 publications 1972: 0 publications 1973: 2 publications 1974: 1 publication 1975: 1 publication 1976: 0 publications 1977: 0 publications 1978: 3 publications 1979: 0 publications 1980: 0 publications 1981: 0 publications 1982: 0 publications 1983: 0 publications 1984: 3 publications 1985: 1 publication 1986: 0 publications 1987: 0 publications 1988: 1 publication 1989: 0 publications 1990: 1 publication 1991: 5 publications 1992: 5 publications 1993: 9 publications 1994: 9 publications 1995: 11 publications 1996: 7 publications 1997: 11 publications 1998: 5 publications 1999: 8 publications 2000: 5 publications 2001: 10 publications 2002: 7 publications 2003: 9 publications 2004: 5 publications 2005: 7 publications 2006: 9 publications 2007: 4 publications 2008: 3 publications 2009: 5 publications 2010: 1 publication 2011: 3 publications 2012: 0 publications 2013: 5 publications 2014: 0 publications 2015: 1 publication 2016: 1 publication 2017: 2 publications 2018: 1 publication 2019: 3 publications 2020: 5 publications 2021: 2 publications 2022: 7 publications 2023: 10 publications 2024: 11 publications 2025: 9 publications 2026: 2 publications
1958 2026

223 publications in total across all disciplines

View publications per year as a table
Hiroshi Okamoto: publications per year, 1958 to 2026
Year Publications
1958 2
1959 1
1960 0
1961 0
1962 0
1963 0
1964 0
1965 0
1966 1
1967 3
1968 1
1969 1
1970 1
1971 3
1972 0
1973 2
1974 1
1975 1
1976 0
1977 0
1978 3
1979 0
1980 0
1981 0
1982 0
1983 0
1984 3
1985 1
1986 0
1987 0
1988 1
1989 0
1990 1
1991 5
1992 5
1993 9
1994 9
1995 11
1996 7
1997 11
1998 5
1999 8
2000 5
2001 10
2002 7
2003 9
2004 5
2005 7
2006 9
2007 4
2008 3
2009 5
2010 1
2011 3
2012 0
2013 5
2014 0
2015 1
2016 1
2017 2
2018 1
2019 3
2020 5
2021 2
2022 7
2023 10
2024 11
2025 9
2026 2
Total 223
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Hiroshi Okamoto 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 Hiroshi Okamoto sits on this spectrum.

No. of scientists
200 400 600 800
Bar chart with 100 bars. Horizontal axis: publications, 47–56 to 1,028+. Vertical axis: number of scientists, 0 to 980. Most scientists, 980, have 127–136 publications. The last bar groups every scientist with 1,028 publications or more. The highlighted bar, 167–176 publications, is where this scientist sits. 47–56 publications: 8 scientists 57–66 publications: 35 scientists 67–76 publications: 106 scientists 77–86 publications: 231 scientists 87–96 publications: 413 scientists 97–106 publications: 546 scientists 107–116 publications: 704 scientists 117–126 publications: 848 scientists 127–136 publications: 980 scientists 137–146 publications: 942 scientists 147–156 publications: 969 scientists 157–166 publications: 949 scientists 167–176 publications: 951 scientists 177–186 publications: 915 scientists 187–196 publications: 787 scientists 197–206 publications: 840 scientists 207–216 publications: 733 scientists 217–226 publications: 708 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: 417 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: 196 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: 59 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 scientist 997–1,006 publications: 5 scientists 1,007–1,016 publications: 2 scientists 1,017–1,026 publications: 2 scientists 1,027 publications: 1 scientist 1,028+ publications: 100 scientists
47–56 publications 1,028+

This scientist: 176 publications — 39th percentile

39% of scientists in this discipline score the same or lower.

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

View publications distribution as a table
Number of Biology and Biochemistry scientists by publication count, Research.com 2026 ranking edition. Based on 19,587 ranked scientists.
Publications Scientists This scientist
47–56 8
57–66 35
67–76 106
77–86 231
87–96 413
97–106 546
107–116 704
117–126 848
127–136 980
137–146 942
147–156 969
157–166 949
167–176 951 176
177–186 915
187–196 787
197–206 840
207–216 733
217–226 708
227–236 651
237–246 605
247–256 510
257–266 524
267–276 434
277–286 417
287–296 350
297–306 363
307–316 315
317–326 296
327–336 261
337–346 240
347–356 219
357–366 196
367–376 154
377–386 161
387–396 155
397–406 145
407–416 124
417–426 112
427–436 132
437–446 116
447–456 99
457–466 81
467–476 91
477–486 80
487–496 80
497–506 59
507–516 36
517–526 46
527–536 54
537–546 44
547–556 43
557–566 43
567–576 42
577–586 25
587–596 34
597–606 23
607–616 33
617–626 31
627–636 27
637–646 25
647–656 28
657–666 34
667–676 18
677–686 16
687–696 10
697–706 12
707–716 21
717–726 12
727–736 12
737–746 10
747–756 7
757–766 13
767–776 15
777–786 13
787–796 9
797–806 9
807–816 7
817–826 4
827–836 9
837–846 7
847–856 3
857–866 5
867–876 5
877–886 11
887–896 3
897–906 4
907–916 7
917–926 5
927–936 6
937–946 6
947–956 3
957–966 7
967–976 2
977–986 2
987–996 1
997–1,006 5
1,007–1,016 2
1,017–1,026 2
1,027 1
1,028+ 100
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Hiroshi Okamoto 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 Hiroshi Okamoto sits on this spectrum.

No. of scientists
250 500 750 1,000 1,250
Bar chart with 65 bars. Horizontal axis: D-Index, 40–41 to 167+. Vertical axis: number of scientists, 0 to 1,253. Most scientists, 1,253, have 58–59 D-Index. The last bar groups every scientist with 167 D-Index or more. The highlighted bar, 66–67 D-Index, is where this scientist sits. 40–41 D-Index: 80 scientists 42–43 D-Index: 183 scientists 44–45 D-Index: 316 scientists 46–47 D-Index: 504 scientists 48–49 D-Index: 718 scientists 50–51 D-Index: 899 scientists 52–53 D-Index: 1,025 scientists 54–55 D-Index: 1,149 scientists 56–57 D-Index: 1,235 scientists 58–59 D-Index: 1,253 scientists 60–61 D-Index: 1,162 scientists 62–63 D-Index: 1,130 scientists 64–65 D-Index: 1,031 scientists 66–67 D-Index: 897 scientists 68–69 D-Index: 814 scientists 70–71 D-Index: 714 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: 71 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
40–41 D-Index 167+

This scientist: 66 D-Index — 57th percentile

57% of scientists in this discipline score the same or lower.

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

View D-Index distribution as a table
Number of Biology and Biochemistry scientists by D-index, Research.com 2026 ranking edition. Based on 19,587 ranked scientists.
D-Index Scientists This scientist
40–41 80
42–43 183
44–45 316
46–47 504
48–49 718
50–51 899
52–53 1,025
54–55 1,149
56–57 1,235
58–59 1,253
60–61 1,162
62–63 1,130
64–65 1,031
66–67 897 66
68–69 814
70–71 714
72–73 709
74–75 596
76–77 512
78–79 473
80–81 412
82–83 373
84–85 358
86–87 285
88–89 273
90–91 227
92–93 208
94–95 193
96–97 153
98–99 157
100–101 148
102–103 120
104–105 113
106–107 100
108–109 86
110–111 67
112–113 71
114–115 73
116–117 64
118–119 53
120–121 60
122–123 54
124–125 43
126–127 38
128–129 49
130–131 26
132–133 18
134–135 23
136–137 32
138–139 32
140–141 27
142–143 19
144–145 22
146–147 12
148–149 16
150–151 14
152–153 10
154–155 13
156–157 10
158–159 7
160–161 9
162–163 13
164–165 4
166 4
167+ 98
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Overview

Hiroshi Okamoto is affiliated with Kanazawa University in Japan and has contributed extensively to the field of medicine, focusing particularly on surgery and related sub-disciplines.

Their research spans multiple areas within medical science, including pulmonary and respiratory medicine, physiology, gastroenterology, and oncology. Specific topics of study include esophageal and gastrointestinal pathology, esophageal cancer research and treatment, gastroesophageal reflux and treatments, metastasis and carcinoma case studies, tracheal and airway disorders, dysphagia assessment and management, as well as calcium signaling and nucleotide metabolism.

Hiroshi Okamoto has published in various notable venues, with frequent publications appearing in:

  • Diseases of the Esophagus
  • Cancers
  • Annals of Gastroenterological Surgery
  • Journal of Clinical Medicine
  • Surgical Case Reports

Their recent notable papers include:

  • "Inhibition of CD38 and supplementation of nicotinamide riboside ameliorate lipopolysaccharide-induced microglial and astrocytic neuroinflammation by increasing NAD+" (2021, Journal of Neurochemistry)
  • "GR, Sgk1, and NDRG1 in esophageal squamous cell carcinoma: their correlation with therapeutic outcome of neoadjuvant chemotherapy" (2020, BMC Cancer)
  • "The pivotal role of the angiotensin-II-NF-κB axis in the development of COVID-19 pathophysiology" (2020, Hypertension Research)
  • "Necroptosis in Esophageal Squamous Cell Carcinoma: An Independent Prognostic Factor and Its Correlation with Tumor-Infiltrating Lymphocytes" (2021, Cancers)
  • "Oxytocin and CD38 in the paraventricular nucleus play a critical role in paternal aggression in mice" (2020, Hormones and Behavior)

The scientist has collaborated frequently with several coauthors, including:

  • Yusuke Taniyama
  • Chiaki Sato
  • Takashi Kamei
  • Yohei Ozawa
  • Hirotaka Ishida

Best Publications

  • Novel splice variants of the receptor for advanced glycation end-products expressed in human vascular endothelial cells and pericytes, and their putative roles in diabetes-induced vascular injury.

    Hideto Yonekura;Yasuhiko Yamamoto;Shigeru Sakurai;Ralica G. Petrova

  • CD38 is critical for social behaviour by regulating oxytocin secretion

    Duo Jin;Hong Xiang Liu;Hirokazu Hirai;Takashi Torashima

  • Development and prevention of advanced diabetic nephropathy in RAGE-overexpressing mice

    Yasuhiko Yamamoto;Ichiro Kato;Toshio Doi;Hideto Yonekura

  • Cyclic ADP-ribose in insulin secretion from pancreatic beta cells

    Shin Takasawa;Koji Nata;Hideto Yonekura;Hiroshi Okamoto

  • Synthesis and hydrolysis of cyclic ADP-ribose by human leukocyte antigen CD38 and inhibition of the hydrolysis by ATP.

    S Takasawa;A Tohgo;N Noguchi;T Koguma

  • RAGE control of diabetic nephropathy in a mouse model: effects of RAGE gene disruption and administration of low-molecular weight heparin.

    Khin Mar Myint;Yasuhiko Yamamoto;Toshio Doi;Ichiro Kato

  • The Reg gene family and Reg proteins: with special attention to the regeneration of pancreatic β-cells

    Hiroshi Okamoto

  • CD38 DISRUPTION IMPAIRS GLUCOSE-INDUCED INCREASES IN CYCLIC ADP-RIBOSE, CA2+I, AND INSULIN SECRETION

    Ichiro Kato;Yasuhiko Yamamoto;Miki Fujimura;Naoya Noguchi

  • Activation of Reg gene, a gene for insulin-producing β-cell regeneration: Poly(ADP-ribose) polymerase binds Reg promoter and regulates the transcription by autopoly(ADP-ribosyl)ation

    Takako Akiyama;Shin Takasawa;Koji Nata;Seiichi Kobayashi

  • ADP ribosyl cyclase activity of a novel bone marrow stromal cell surface molecule, BST-1

    Yuichi Hirata;Naoki Kimura;Koh Sato;Yoshiyuki Ohsugi

  • Identification of a Receptor for Reg (Regenerating Gene) Protein, a Pancreatic β-Cell Regeneration Factor

    Seiichi Kobayashi;Takako Akiyama;Koji Nata;Michiaki Abe

  • Transgenic Mice Overexpressing Type 2 Nitric-oxide Synthase in Pancreatic β Cells Develop Insulin-dependent Diabetes without Insulitis

    Toshinari Takamura;Ichiro Kato;Noriko Kimura;Tetsuya Nakazawa

  • Cyclic ADP-ribose modulates Ca2+ release channels for activation by physiological Ca2+ entry in bullfrog sympathetic neurons

    Shao Ying Hua;Takayuki Tokimasa;Shin Takasawa;Yasuhito Furuya

  • Regenerating gene protein may mediate gastric mucosal proliferation induced by hypergastrinemia in rats

    Hirokazu Fukui;Yoshikazu Kinoshita;Toru Maekawa;Akihiko Okada

  • Amelioration of Vasospasm After Subarachnoid Hemorrhage in Transgenic Mice Overexpressing CuZn–Superoxide Dismutase

    Hideyuki Kamii;Ichiro Kato;Hiroyuki Kinouchi;Pak H. Chan

  • Increased Expression of HIP/PAP and Regenerating Gene III in Human Inflammatory Bowel Disease and a Murine Bacterial Reconstitution Model

    Hitoshi Ogawa;Kouhei Fukushima;Hiroo Naito;Yuji Funayama

  • Structure, chromosomal localization, and expression of mouse reg genes, reg I and reg II. A novel type of reg gene, reg II, exists in the mouse genome.

    M. Unno;H. Yonekura;K.-I. Nakagawara;T. Watanabe

  • Reg gene expression is increased in rat gastric enterochromaffin-like cells following water immersion stress

    M. Asahara;S. Mushiake;S. Shimada;H. Fukui

  • Essential cysteine residues for cyclic ADP-ribose synthesis and hydrolysis by CD38.

    Akira Tohgo;Shin Takasawa;Naoya Noguchi;Tetsuhiko Koguma

  • Cloning and characterization of cDNA encoding rat ADP-ribosyl cyclase / cyclic ADP-ribose hydrolase (homologue to human CD38) from islets of Langerhans

    Tetsuhiko Koguma;Shin Takasawa;Akira Tohgo;Tadahiro Karasawa

Frequent Co-Authors

Shin Takasawa
Shin Takasawa Nara Medical University
Yasuhiko Yamamoto
Yasuhiko Yamamoto Kanazawa University
Michiaki Unno
Michiaki Unno Tohoku University
Hiroshi Yamamoto
Hiroshi Yamamoto Komatsu University
Haruhiro Higashida
Haruhiro Higashida Kanazawa University
Masayoshi Takeuchi
Masayoshi Takeuchi Kanazawa Medical University
Tsutomu Chiba
Tsutomu Chiba Kyoto University
Mami Noda
Mami Noda Kyushu University
Masahide Asano
Masahide Asano Kyoto University
Alessandro Antonelli
Alessandro Antonelli University of Pisa

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