Phenylbutyrate / PARP Cancer Research Results

PB, Phenylbutyrate: Click to Expand ⟱
Features:
Used to treat urea cycle disorders
Sodium phenylbutyrate helps remove ammonia from the body.
-Phenyl-butyrate (PB)4 is an aromatic fatty acid that is converted in vivo to phenylacetate (PA) by β-oxidation in liver and kidney mitochondria.
-In human body, phenylbutyrate is oxidized to phenylacetate, which is in turn conjugated with glutamine and eliminated in urine as phenylacetylglutamine, thereby mediating elimination of waste nitrogen
-Phenylbutyrate is one of the first drugs encountered in cancer therapy as a histone deacetylase inhibitor (HDACI) (relatively weak compared to vorinostat (SAHA), romidepsin, etc.).
-Butyric acid is one of the short-chain fatty acids produced by the gut microbiota through the fermentation of dietary fiber. Butyrate is primarily recognized for its beneficial effects in the colon and is tightly linked to gut health.
-Phenylbutyrate is a derivative of butyrate that has been chemically modified by the addition of a phenyl group. This structural change increases its lipophilicity (fat solubility) and alters its metabolic fate and biological activity. This allows it to be used as a systemic drug, in contrast to the locally produced butyrate in the gut, which is rapidly metabolized by colonocytes

Pathways:
-Histone deacetylase (HDAC) inhibitor
-ER stress inhibitor (at least in normal cell)
-Can act as a chemical chaperone, helping to reduce ER stress by facilitating proper protein folding.
-Modulation of NF-κB Signaling
-Changes in pathways such as PI3K/Akt/mTOR and MAPK.
-Some preclinical investigations have reported that treatment with phenylbutyrate leads to mitochondrial dysfunction and endoplasmic reticulum (ER) stress, both of which can result in an increase of ROS within cancer cells.

Note: Sodium butyrate (NaBu) vs Sodium phenylbutyrate
-Sodium butyrate is primarily a research tool with limited clinical application, whereas phenylbutyrate is used clinically
-Phenylbutyrate typically exhibits improved pharmacokinetics and is more amenable to systemic use compared to sodium butyrate.
-Both compounds act as HDAC inhibitors, phenylbutyrate additionally modulates ER stress and mitochondrial function, leading to potentially greater ROS production in certain cancer cells.

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Rank Pathway / Axis Cancer Context Normal Tissue Context TSF Primary Effect Notes
1 Histone Deacetylase (HDAC) inhibition Histone acetylation ↑; p21 ↑; differentiation ↑; proliferation ↓ Gene-expression modulation R, G Epigenetic reprogramming Core anticancer mechanism; early-generation, relatively weak HDAC inhibitor.
2 Cell-cycle arrest G1 arrest ↑; Cyclin D1 ↓ (reported) ↔ G Cytostasis Common downstream effect of HDAC inhibition.
3 Apoptosis Caspase activation ↑ (reported; model-dependent) ↔ G Cell death execution Often secondary to transcriptional changes and stress modulation.
4 ER stress / Chemical chaperone activity Context-dependent: ER stress ↑ or ↓ ER stress ↓ (protein misfolding disorders) R, G Protein-folding modulation Acts as chemical chaperone; effect depends on cell type and dose.
5 NF-κB signaling NF-κB modulation (reported) Inflammatory tone modulation R, G Transcriptional regulation Likely secondary to epigenetic changes.
6 PI3K → AKT / MAPK pathways Survival pathway modulation (reported; model-dependent) ↔ R, G Growth signaling modulation Downstream transcriptional effects rather than primary kinase inhibition.
7 Mitochondrial stress / ROS ROS modulation (context-dependent) ↔ P, R, G Metabolic adaptation Not a primary ROS-inducing agent; effects vary by tumor model.
8 Urea-cycle nitrogen scavenging (approved indication) — Ammonia elimination ↑ (phenylacetylglutamine formation) — Clinical metabolic role Primary approved medical use.


PARP, poly ADP-ribose polymerase (PARP) cleavage: Click to Expand ⟱
Source:
Type:
Poly (ADP-ribose) polymerase (PARP) cleavage is a hallmark of caspase activation. PARP (Poly (ADP-ribose) polymerase) is a family of proteins involved in a variety of cellular processes, including DNA repair, genomic stability, and programmed cell death. PARP enzymes play a crucial role in repairing single-strand breaks in DNA.
PARP has gained significant attention, particularly in the treatment of certain types of tumors, such as those with BRCA1 or BRCA2 mutations. These mutations impair the cell's ability to repair double-strand breaks in DNA through homologous recombination. Cancer cells with these mutations can become reliant on PARP for survival, making them particularly sensitive to PARP inhibitors.
PARP inhibitors, such as olaparib, rucaparib, and niraparib, have been developed as targeted therapies for cancers associated with BRCA mutations.

PARP Family:
The poly (ADP-ribose) polymerases (PARPs) are a family of enzymes involved in a number of cellular processes, including DNA repair, genomic stability, and programmed cell death.
PARP1 is the predominant family member responsible for detecting DNA strand breaks and initiating repair processes, especially through base excision repair (BER).

PARP1 Overexpression:
In several cancer types—including breast, ovarian, prostate, and lung cancers—elevated PARP1 expression and/or activity has been reported.
High PARP1 expression in certain cancers has been associated with aggressive tumor behavior and resistance to therapies (especially those that induce DNA damage).
Increased PARP1 activity may correlate with poorer overall survival in tumors that rely on DNA repair for survival.
Scientific Papers found: Click to Expand⟱
2057- PB,    Trichomonas vaginalis induces apoptosis via ROS and ER stress response through ER–mitochondria crosstalk in SiHa cells
- in-vitro, Cerv, SiHa
ROS↓, tumCV∅, cl‑PARP↓, cl‑Casp3↓, MMP∅, ER Stress↓,
2070- PB,    Phenylbutyrate-induced apoptosis is associated with inactivation of NF-kappaB IN HT-29 colon cancer cells
- in-vitro, CRC, HT-29
TumCG↓, Apoptosis↑, MMP↓, Casp3↑, PARP↓, NF-kB↓, eff↑,

Showing Research Papers: 1 to 2 of 2

* indicates research on normal cells as opposed to diseased cells
Total Research Paper Matches: 2

Pathway results for Effect on Cancer / Diseased Cells:


Redox & Oxidative Stress ⓘ

ROS↓, 1,  

Mitochondria & Bioenergetics ⓘ

MMP↓, 1,   MMP∅, 1,  

Cell Death ⓘ

Apoptosis↑, 1,   Casp3↑, 1,   cl‑Casp3↓, 1,  

Transcription & Epigenetics ⓘ

tumCV∅, 1,  

Protein Folding & ER Stress ⓘ

ER Stress↓, 1,  

DNA Damage & Repair ⓘ

PARP↓, 1,   cl‑PARP↓, 1,  

Proliferation, Differentiation & Cell State ⓘ

TumCG↓, 1,  

Immune & Inflammatory Signaling ⓘ

NF-kB↓, 1,  

Drug Metabolism & Resistance ⓘ

eff↑, 1,  
Total Targets: 13

Pathway results for Effect on Normal Cells:


Total Targets: 0

Scientific Paper Hit Count for: PARP, poly ADP-ribose polymerase (PARP) cleavage
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

Filter Conditions: Pro/AntiFlg:%  IllCat:%  CanType:%  Cells:%  prod#:15  Target#:239  State#:%  Dir#:1
  wNotes=0  sortOrder:rid,rpid

 

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