Evidence map›Paper›PMID 35365766›Full record

ArticleBritish journal of cancer2022

5-Aminolevulinic acid overcomes hypoxia-induced radiation resistance by enhancing mitochondrial reactive oxygen species production in prostate cancer cells.

Takuya Owari, Nobumichi Tanaka, Yasushi Nakai, Makito Miyake, Satoshi Anai, Shingo Kishi, Shiori Mori, Rina Fujiwara-Tani, Yudai Hojo, Takuya Mori and 5 more

Open access · hybridAbstract read
In one paragraph

Article in British journal of cancer, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
27citing papers in PubMed, 1 pooled it
3.4field-weighted citation impact, top 6% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

27 citing papers in PubMed, 1 synthesis or guideline pooled it, 38 citations in OpenAlex.

  1. Pooled it
  2. Trial
  3. Dilating the aging clock with light.Innovation (Cambridge (Mass.)) · 2026
    Review
  4. Article
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  13. Mitochondrial Reactive Oxygen Species (mROS) Generation and Cancer:International journal of nanomedicine · 2025
    Review
  14. Article
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  16. Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

15 authors at 1 institution in 1 country.

Takuya OwariDepartment of Urology, Nara Medical University, Kashihara, Nara, Japan.
Nobumichi TanakaDepartment of Urology, Nara Medical University, Kashihara, Nara, Japan.
Yasushi NakaiDepartment of Urology, Nara Medical University, Kashihara, Nara, Japan.
Makito MiyakeDepartment of Urology, Nara Medical University, Kashihara, Nara, Japan.
Satoshi AnaiDepartment of Urology, Nara Medical University, Kashihara, Nara, Japan.
Shingo KishiDepartment of Molecular Pathology, Nara Medical University, Kashihara, Nara, Japan.
Shiori MoriDepartment of Molecular Pathology, Nara Medical University, Kashihara, Nara, Japan.
Rina Fujiwara-TaniDepartment of Molecular Pathology, Nara Medical University, Kashihara, Nara, Japan.
Yudai HojoDepartment of Molecular Pathology, Nara Medical University, Kashihara, Nara, Japan.
Takuya MoriDepartment of Molecular Pathology, Nara Medical University, Kashihara, Nara, Japan.
Masaomi KuwadaDepartment of Urology, Nara Medical University, Kashihara, Nara, Japan.
Tomomi FujiiDepartment of Pathology, Nara Medical University, Kashihara, Nara, Japan.
Masatoshi HasegawaDepartment of Radiation Oncology, Nara Medical University, Kashihara, Nara, Japan.
Kiyohide FujimotoDepartment of Urology, Nara Medical University, Kashihara, Nara, Japan. kiyokun@naramed-u.ac.jp.ORCID http://orcid.org/0000-0003-1507-2464
Hiroki KuniyasuDepartment of Molecular Pathology, Nara Medical University, Kashihara, Nara, Japan. cooninh@zb4.so-net.ne.jp.ORCID http://orcid.org/0000-0003-2298-8825
Nara Medical University · JP

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundThe naturally occurring amino acid 5-aminolevulinic acid (5-ALA) is a precursor of protoporphyrin IX (PpIX) biosynthesised in the mitochondria. When accumulated PpIX is excited by light (wavelength of 625-635 nm), reactive oxygen species (ROS) are generated. Here, we investigated whether 5-ALA may increase the sensitisation of prostate cancer (PCA) cells to radiotherapy through the generation of ROS via its metabolite, PpIX.

methodsEffect of 5-ALA on PC-3 and DU-145 PCA cell lines treated with ionising radiation (IR) was examined in vitro and in vivo with assessment by clonogenic assay, mitochondrial function and ROS production under normoxia or hypoxia condition.

results5-ALA enhanced intra-mitochondrial ROS production immediately after exposure to IR and decreased mitochondrial membrane potential via increase of intra-cellular PpIX. IR with 5-ALA induced mitochondrial dysfunction and increased ATP production, switching energy metabolism to the quiescence. Under hypoxic condition, ROS burst and mitochondrial dysfunction were induced by IR with 5-ALA resulting reducing cancer stemness and radiation resistance.

conclusionThese results suggest that combined therapy with 5-ALA and radiation therapy is a novel strategy to improve the anti-cancer effects of radiation therapy for PCA.

Indexed as

PhotochemotherapyProstatic NeoplasmsAminolevulinic AcidCell Line, TumorHumansHypoxiaMaleMitochondriaPhotosensitizing AgentsProtoporphyrinsReactive Oxygen SpeciesAminolevulinic AcidPhotosensitizing AgentsProtoporphyrinsReactive Oxygen Species

Identifiers

PMID35365766
PMCPMC9296661
OpenAlexW4220978750

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.