Database Query Results : Photodynamic Therapy, ,

PDT, Photodynamic Therapy: Click to Expand ⟱
Features: Therapy
Photodynamic therapy is a form of phototherapy involving light and a photosensitizing chemical substance used in conjunction with molecular oxygen to elicit cell death.
Photodynamic therapy (PDT) is a 3-component cytotoxic platform: photosensitizer + light (matched wavelength) + oxygen. Light excites the photosensitizer, which then generates reactive oxygen species (ROS)—often dominated by singlet oxygen (¹O₂)—causing localized oxidative damage to tumor cells, tumor vasculature, and sometimes triggering immunogenic cell death (ICD).
Key constraints are light penetration depth and tumor hypoxia (and PDT itself can transiently consume oxygen).


Photodynamic Therapy (PDT) — Cancer-Oriented Time-Scale Flagged Pathway Table
Rank Pathway / Axis Cancer / Tumor Context Normal Tissue Context TSF Primary Effect Notes / Interpretation
1 Type II photochemistry: singlet oxygen (¹O₂) generation ¹O₂ ↑↑ locally; oxidative damage ↑ Localized injury only where PS+light overlap P Core cytotoxic mechanism PDT typically relies heavily on Type II energy transfer producing singlet oxygen as a primary cytotoxic agent (oxygen-dependent).
2 Type I photochemistry: radical ROS (O2•−, •OH, etc.) Radical ROS ↑ (context; PS-dependent) Localized oxidative injury (exposure-limited) P ROS amplification Type I electron-transfer pathways can contribute, especially for some PS designs and oxygen-limited niches.
3 Direct tumor cell kill (membrane/protein/DNA oxidation) Apoptosis/necrosis/other death programs ↑ (context) Collateral damage limited by targeting + light field R, G Local tumor cytotoxicity Oxidative injury can trigger multiple death modes; outcome depends on dose, PS localization (membrane/mitochondria/lysosome), and oxygen.
4 Vascular shutdown (tumor vasculature damage) Perfusion ↓; secondary hypoxia/ischemia ↑ Local vascular injury possible R Indirect tumor starvation PDT can damage tumor-associated vessels, restricting nutrient/oxygen supply and contributing to delayed tumor kill.
5 Oxygen dependence / hypoxia limitation Efficacy ↓ in hypoxic tumors; PDT consumes O2 during reaction — P, R Core constraint Tumor hypoxia is a major barrier; PDT can transiently reduce local oxygen levels during illumination.
6 Immune activation / immunogenic cell death (ICD) DAMP release ↑; anti-tumor immunity ↑ (protocol/PS-dependent) Inflammatory signaling ↑ locally G Systemic immune leverage PDT can trigger ICD and stimulate adaptive immune responses, but this is highly dependent on photosensitizer and protocol.
7 Inflammation & cytokine wave (acute) Local cytokines ↑; immune cell recruitment ↑ Local inflammation ↑ R, G Microenvironment remodeling Post-PDT inflammation can support tumor clearance or, if suboptimal, contribute to repair/regrowth; protocol matters.
8 Combination leverage (radiation/chemo/immunotherapy) Sensitization ↑ (context-dependent) — G Adjunct synergy PDT is often paired with other modalities; strongest logic is local tumor kill + immune priming + improved control of residual disease.
9 Light penetration depth constraint Deep tumors harder to treat (limited light reach) — — Translation constraint Most activation light has limited tissue penetration; strategies include fiber optics, endoscopic delivery, or NIR-shifted PS designs.
10 Photosensitizer PK & phototoxicity risk PS accumulation affects selectivity Skin/eye photosensitivity risk (agent-dependent) R, G Clinical constraint Systemic photosensitizers can cause prolonged photosensitivity; topical/ALA-based approaches reduce systemic exposure in some uses.

Time-Scale Flag (TSF): P / R / G

  • P: 0–30 min (photoactivation + ROS burst)
  • R: 30 min–3 hr (vascular effects, acute stress signaling)
  • G: >3 hr (cell-death completion, immune recruitment, ICD outcomes)


Common Clinical Photosensitizers for Cancer PDT
Photosensitizer Class Activation Wavelength (nm) Penetration Depth* Photosensitivity Duration Typical Clinical Use Notes
5-ALA (→ Protoporphyrin IX) Endogenous porphyrin precursor ~630–635 nm Shallow–Moderate (~2–5 mm) Short (24–48 hrs; topical shorter) Skin cancers, actinic keratosis, bladder, glioma visualization Prodrug converted intracellularly to PpIX; good tumor selectivity; minimal prolonged systemic photosensitivity.
Porfimer sodium (Photofrin®) First-generation porphyrin ~630 nm Moderate (~5–10 mm) Long (4–6 weeks) Esophageal, lung, bladder cancers Prolonged skin photosensitivity is a major limitation.
Temoporfin (Foscan®) Chlorin ~652 nm Moderate (~5–10 mm) 2–3 weeks Head & neck cancers Higher potency than Photofrin; improved absorption spectrum.
Verteporfin (Visudyne®) Benzoporphyrin derivative ~689 nm Moderate–Deeper (~5–10+ mm) Short (few days) Primarily ophthalmology; investigated in oncology Better red/NIR absorption; shorter photosensitivity window.
Talcaporfin sodium (Laserphyrin®) Chlorin derivative ~664 nm Moderate (~5–10 mm) Short (~1–2 weeks) Lung, brain tumors (Japan) Improved safety vs first-generation porphyrins.
Methylene Blue Phenothiazine dye ~660–670 nm Shallow–Moderate Short Experimental oncology; antimicrobial PDT Strong Type I ROS contribution; also has redox cycling effects without light.
Hypericin Natural anthraquinone ~590–600 nm Shallow Variable Investigational High singlet oxygen yield; hydrophobic; not widely used clinically.

*Penetration depth depends on wavelength, tissue optical properties, and light delivery method. Red/NIR light (~650–700 nm) penetrates deeper than blue/green light.



Scientific Papers found: Click to Expand⟱
5270- 5-ALA,  PDT,    5-Aminolevulinic Acid as a Theranostic Agent for Tumor Fluorescence Imaging and Photodynamic Therapy
- Review, Var, NA
other↝, Since the use of ALA-based drugs for tumor diagnosis or therapy depends on preferential PpIX tumor accumulation, we begin this review with an overview of PpIX biosynthesis from ALA and end with the prospect of combining the diagnostic and therapeutic
ROS↑, These components individually are not harmful but become cytotoxic when combined due to the generation of reactive oxygen species (ROS) via type I and II photochemical reactions.
other↝, ALA was known to cause endogenous PpIX accumulation in human lymphocytes in the 1970s [15].
mtDam↑, which causes direct mitochondrial structural damage and Ca2+ release [24].
Ca+2↑,
ER Stress↑, ALA-PDT is known to damage the endoplasmic reticulum (ER) and cause Ca2+ release, triggering apoptosis through ER-stress signaling [25].
Apoptosis↑,
TumAuto↑, Lastly, ALA-PDT is also known to induce autophagy, the degradation of cellular components by lysosomes.
other↝, ALA administration exhibits red fluorescence and photosensitizing activity upon light activation.
Dose↝, Although blue and red light-emitting diode (LED) illuminators are commonly used as the light source to activate ALA and MAL for PDT of AK lesions, natural daylight is emerging as an attractive and convenient alternative.
Imm↑, ALA-PDT not only directly kills tumor cells but also elicits potent immune responses with important implications in the long-term therapeutic outcome.

336- AgNPs,  PDT,    Photodynamic ability of silver nanoparticles in inducing cytotoxic effects in breast and lung cancer cell lines
- in-vitro, BC, MCF-7
Apoptosis↑,

4564- AgNPs,  GoldNP,  Cu,  Chemo,  PDT  Cytotoxicity and targeted drug delivery of green synthesized metallic nanoparticles against oral Cancer: A review
- Review, Var, NA
ROS↑, graphical abstract
DNAdam↑, inducing cell death through apoptotic signaling pathways, and inducing excess reactive oxygen species (ROS) in tumor cells, which leads to oxidative damage and increased production of proapoptotic enzymes
TumCCA↑,
eff↑, Metallic nanoparticles, especially those derived from metals, improve the effectiveness of anticancer agents by facilitating targeted delivery and sustained release at tumor sites.
Apoptosis↑,
eff↓, Au NPs are notable for their biocompatibility and are utilized in photothermal therapy to convert light into heat, effectively destroying cancer cells
ChemoSen↑, Magnesium oxide nanoparticles (MgO NPs) induce apoptosis through ROS production and enhance the impact of chemotherapy drugs, synthesized with plant extracts as reducing agents.

335- AgNPs,  PDT,    Biogenic Silver Nanoparticles for Targeted Cancer Therapy and Enhancing Photodynamic Therapy
- Review, NA, NA
ROS↑,
GSH↓,
GPx↑,
Catalase↓,
SOD↓,
p38↑,
BAX↑,
Bcl-2↓,

1374- BBR,  PDT,    Berberine associated photodynamic therapy promotes autophagy and apoptosis via ROS generation in renal carcinoma cells
- in-vitro, RCC, 786-O - in-vitro, RCC, HK-2
ROS↑,
TumAuto↑,
Apoptosis↑,
Casp3↑,
eff↑, HK-2 treated with BBR associated with PDT showed a significant decrease in the cellular viability compared to the control cells

2680- BBR,  PDT,    Photodynamic therapy-triggered nuclear translocation of berberine from mitochondria leads to liver cancer cell death
- in-vitro, Liver, HUH7
TumCD↑, blue light irradiation (488 nm). The results showed that berberine rapidly translocated from the mitochondria to the nucleus upon light exposure, ultimately inducing cell death in SNU449 and Huh7 cells.
ROS↑, Additionally, we observed a significant increase in reactive oxygen species, linking the phototoxic effects to oxidative stress
TumCCA↑, indicating cell cycle arrest following treatment with berberine and PDT
ER Stress↑, Western blotting confirmed that ER stress was significantly induced

2681- BBR,  PDT,    Berberine-photodynamic induced apoptosis by activating endoplasmic reticulum stress-autophagy pathway involving CHOP in human malignant melanoma cells
- in-vitro, Melanoma, NA
Apoptosis↑, BBR-PDT induced apoptosis via up-regulating the expression of cleaved caspase-3 protein.
cl‑Casp3↑,
LC3s↑, LC3-related autophagy level was upregulated in MMCs with BBR-PDT.
ER Stress↑, BBR-PDT activated endoplasmic reticulum (ER) stress, involving a dramatic increase in reactive oxygen species (ROS).
ROS↑,
CHOP↑, knockdown of CHOP protein expression inhibited apoptosis, autophagy and ER stress levels caused by BBR-PDT, suggesting that CHOP protein may be related to apoptosis, autophagy and ER stress in MMCs with BBR-PDT

483- CUR,  PDT,    Visible light and/or UVA offer a strong amplification of the anti-tumor effect of curcumin
- in-vivo, NA, A431
TumVol↓,
TumCP↓,
Apoptosis↑,

484- CUR,  PDT,    Low concentrations of curcumin induce growth arrest and apoptosis in skin keratinocytes only in combination with UVA or visible light
- in-vitro, Melanoma, NA
Cyt‑c↑, release of cytochrome c from mitochondria
Casp9↑,
Casp8↑,
NF-kB↓,
EGFR↓,

485- CUR,  PDT,    Red Light Combined with Blue Light Irradiation Regulates Proliferation and Apoptosis in Skin Keratinocytes in Combination with Low Concentrations of Curcumin
- in-vitro, Melanoma, NA
NF-kB↓,
Casp8↑,
Casp9↑,
p‑Akt↓,
p‑ERK↓,

482- CUR,  PDT,    The Antitumor Effect of Curcumin in Urothelial Cancer Cells Is Enhanced by Light Exposure In Vitro
- in-vitro, Bladder, RT112 - in-vitro, Bladder, UMUC3
Apoptosis↑, cur + light only
TumCG↓,
TumCP↓,

1175- IVM,  PDT,    Drug induced mitochondria dysfunction to enhance photodynamic therapy of hypoxic tumors
- in-vitro, Var, NA
Hypoxia↓,
mitResp↓,
ROS↑, the production of reactive oxygen species would be increase which, in turn, improves the efficacy of PDT against hypoxic tumors.

2532- M-Blu,  PDT,    Methylene blue in anticancer photodynamic therapy: systematic review of preclinical studies
- Review, Var, NA
AntiCan↑, systematic review support the suggestions that photodynamic therapy with methylene blue helps against different types of cancer, including colorectal tumor, carcinoma, and melanoma.

2533- M-Blu,  PDT,    Methylene blue-mediated photodynamic therapy enhances apoptosis in lung cancer cells
- in-vitro, Lung, A549
MMP↓, MB enhances PDT-induced apoptosis in association with downregulation of anti-apoptotic proteins, reduced mitochondrial membrane potential (MMP), increased phosphorylation of the mitogen-activated protein kinase (MAPK) and the generation of ROS
p‑MAPK↑,
ROS↑,
cl‑PARP↑, n MB-PDT-treated A549 cells, we observed PARP cleavage, procaspase-3 activation, downregulation of the anti-apoptotic proteins Bcl-2 and Mcl-1
Bcl-2↓,
Mcl-1↓,
eff↓, pretreatment of A549 cells with the antioxidant N-acetylcysteine (NAC) followed by MB-PDT resulted in increased cell viability and reduced proteolytic cleavage of PARP.

2534- M-Blu,  doxoR,  PDT,    Methylene Blue-Mediated Photodynamic Therapy in Combination With Doxorubicin: A Novel Approach in the Treatment of HT-29 Colon Cancer Cells
- in-vitro, CRC, HT-29
LDH↑, present study, the results strongly suggest that the groups treated with DOX + MB + L 610/830 nm had the highest rates of LDH release
ROS↑, Several studies have shown that PDT via different mechanisms, including ROS generation, damage to cellular components (for example lipids, proteins, and nucleic acids) and, as a result, disrupting the integrity of the cell membrane

1476- SFN,  PDT,    Enhancement of cytotoxic effect on human head and neck cancer cells by combination of photodynamic therapy and sulforaphane
- in-vitro, HNSCC, NA
eff↑, Cell viability was decreased significantly by combination treatment
tumCV↓,
ROS↑, ROS generation was also higher in combination treatment
eff↓, In combination treatment group, apoptosis and necrosis were decreased by administration of sodium azide (SA) which is scavenger of ROS.
Casp↑,

1834- VitK3,  PDT,    Effects of Vitamin K3 Combined with UVB on the Proliferation and Apoptosis of Cutaneous Squamous Cell Carcinoma A431 Cells
- in-vitro, Melanoma, A431
eff↑, co-treatment of VitK3 combined with UVB more significantly inhibited the growth and proliferation of A431 cells than either VitK3 or UVB alone.
TumCG↓,
TumCP↓,
ROS↑, ROS and the depolarization of the mitochondrial membrane potential were higher in all the co-treatment groups
MMP↓,

1838- VitK3,  PDT,    Photodynamic Effects of Vitamin K3 on Cervical Carcinoma Cells Activating Mitochondrial Apoptosis Pathways
- in-vitro, Cerv, NA
eff↑, vitamin K3 (Vit K3) serves as a photosensitizer to produce Reactive Oxygen Species (ROS)
ROS↑,
tumCV↓, Vit K3 treatment plus UVA reduced tumor cell viability
TumCG↓, Vit K3 treatment plus UVA can inhibit tumor growth
Apoptosis↑, enhance the apoptosis of cervical cancer cells
cl‑Casp3↑, cleaved caspase-3, cleaved caspase-9, B-cell lymphoma- extra large (Bcl-xl), and cytochrome c (cyt-c) increased obviously,
cl‑Casp9↑,
Bcl-xL↑,
Cyt‑c↑,
Bcl-2↓, (Bcl-2) decreased


* indicates research on normal cells as opposed to diseased cells
Total Research Paper Matches: 18

Pathway results for Effect on Cancer / Diseased Cells:


Redox & Oxidative Stress ⓘ

Catalase↓, 1,   GPx↑, 1,   GSH↓, 1,   ROS↑, 12,   SOD↓, 1,  

Mitochondria & Bioenergetics ⓘ

mitResp↓, 1,   MMP↓, 2,   mtDam↑, 1,  

Core Metabolism/Glycolysis ⓘ

LDH↑, 1,  

Cell Death ⓘ

p‑Akt↓, 1,   Apoptosis↑, 8,   BAX↑, 1,   Bcl-2↓, 3,   Bcl-xL↑, 1,   Casp↑, 1,   Casp3↑, 1,   cl‑Casp3↑, 2,   Casp8↑, 2,   Casp9↑, 2,   cl‑Casp9↑, 1,   Cyt‑c↑, 2,   p‑MAPK↑, 1,   Mcl-1↓, 1,   p38↑, 1,   TumCD↑, 1,  

Transcription & Epigenetics ⓘ

other↝, 3,   tumCV↓, 2,  

Protein Folding & ER Stress ⓘ

CHOP↑, 1,   ER Stress↑, 3,  

Autophagy & Lysosomes ⓘ

LC3s↑, 1,   TumAuto↑, 2,  

DNA Damage & Repair ⓘ

DNAdam↑, 1,   cl‑PARP↑, 1,  

Cell Cycle & Senescence ⓘ

TumCCA↑, 2,  

Proliferation, Differentiation & Cell State ⓘ

p‑ERK↓, 1,   TumCG↓, 3,  

Migration ⓘ

Ca+2↑, 1,   TumCP↓, 3,  

Angiogenesis & Vasculature ⓘ

EGFR↓, 1,   Hypoxia↓, 1,  

Immune & Inflammatory Signaling ⓘ

Imm↑, 1,   NF-kB↓, 2,  

Drug Metabolism & Resistance ⓘ

ChemoSen↑, 1,   Dose↝, 1,   eff↓, 3,   eff↑, 5,  

Clinical Biomarkers ⓘ

EGFR↓, 1,   LDH↑, 1,  

Functional Outcomes ⓘ

AntiCan↑, 1,   TumVol↓, 1,  
Total Targets: 50

Pathway results for Effect on Normal Cells:


Total Targets: 0

Query results interpretion may depend on "conditions" listed in the research papers.
Such Conditions may include : 
  -low or high Dose
  -format for product, such as nano of lipid formations
  -different cell line effects
  -synergies with other products 
  -if effect was for normal or cancerous cells

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