Side-by-side · Research reference
ACE-031vsPNC-27
Side-by-side comparison across mechanism, dosage, evidence, side effects, administration, and stack synergies. Citations on every claim where available.
APhase 2HUMAN-REVIEWED10/44 cited
BAnimal-StrongHUMAN-REVIEWED18/41 cited
ACE-031
ActRIIB-Fc Fusion · Phase 2 Halted
SQ · Weekly dosing investigated
PNC-27
p53-HDM-2 Peptide · Membrane-Targeting
In vitro / Pre-clinical only
01Mechanism of Action
Parameter
ACE-031
PNC-27
Primary target
Myostatin, GDF11, activin A — TGF-β superfamily ligands
Membrane-bound HDM-2 protein on cancer cell surfaceSarafraz-Yazdi 2022Krzesaj 2024
Pathway
Soluble decoy receptor binds circulating myostatin/TGF-β ligands → prevents ActRIIB activation → SMAD2/3 pathway inhibition
PNC-27 binds to membrane HDM-2 1-109 domain → transmembrane pore formation → rapid necrosis (poptosis)Pincus 2024Krzesaj 2024
Downstream effect
Disinhibition of myogenic signaling, increased skeletal muscle mass and strength
Immediate cell lysis and extrusion of intracellular contents; secondary mitochondrial membrane disruptionPincus 2024Krzesaj 2024
Feedback intact?
—
N/A — cytotoxic mechanism, not signaling modulation
Origin
Recombinant fusion protein: human ActRIIB extracellular domain + IgG1-Fc fragmentReichel 2025
Chimeric design: p53 transactivating domain (12-26) fused to penetratin CPP sequenceSarafraz-Yazdi 2022
Antibody development
—
—
02Dosage Protocols
Parameter
ACE-031
PNC-27
Clinical dosing
Weekly or biweekly SQ injections (exact doses undisclosed pre-halt)
Phase 2 DMD trial protocol not fully published.
—
Black market products
Variable purity; 12/14 tested products contained target protein plus contaminantsReichel 2025
SDS-PAGE revealed multiple protein bands; quality control absent.Reichel 2025
—
Evidence basis
Phase 2 trial discontinued — incomplete dataset
Pre-clinical / In vitro
Half-life
Days to weeks (Fc-fusion typical kinetics)
IgG1-Fc domain confers extended circulation time.
—
Duration investigated
12–24 weeks (trial cut short)
—
Clinical status
—
Pre-clinical only — no human trials
In vitro and animal model data only.
In vitro concentrations
—
10–100 μM range
Effective concentrations in cell culture studies.
Shorter analogue
—
PNC-28 (28 AA variant)
Retains HDM-2 binding and cytotoxic activity.
03Metabolic / Fat Loss Evidence
Parameter
ACE-031
PNC-27
Fat loss mechanism
—
None — cytotoxic anticancer agent
04Side Effects & Safety
Parameter
ACE-031
PNC-27
Epistaxis (nosebleeds)
Significant incidence in Phase 2 DMD trial — primary safety signal
—
Telangiectasia
Dilated capillaries / spider veins observed
—
Vascular abnormalities
Mechanism: ActRIIB/ALK1 pathway disruption affects vascular homeostasis
—
Injection site reactions
Local erythema, induration (biologics class effect)
—
Antibody development
Potential for anti-drug antibodies (Fc-fusion proteins); incidence not reported
—
Black market contaminants
12/14 tested products contained multiple unidentified proteins alongside ACE-031Reichel 2025
—
Human safety data
—
None available — no human trials conducted
Normal cell selectivity
—
In vitro: no cytotoxicity to normal cells (MCF-10-2A, peripheral blood mononuclear cells)Sarafraz-Yazdi 2010Thadi 2020
Normal cells express minimal membrane HDM-2.
Cancer cell specificity
—
Depends on membrane HDM-2 expression levels
Ovarian cancer lines with low membrane HDM-2 showed <30% necrosis.
Mitochondrial effects
—
Secondary mitochondrial membrane disruption in cancer cells
Absolute Contraindications
ACE-031
- ·History of vascular disorders (epistaxis, telangiectasia, HHT)
- ·Pregnancy (TGF-β pathway critical for fetal development)
- ·Active malignancy (myostatin inhibition may affect tumour growth)
- ·Use of non-pharmaceutical grade ACE-031 (contamination risk)Reichel 2025
PNC-27
- ·Human use — no clinical trials or safety data
Relative Contraindications
ACE-031
- ·Coagulation disorders or anticoagulant use (epistaxis risk)
- ·Hereditary hemorrhagic telangiectasia (HHT) family history
- ·Cardiovascular disease (vascular remodeling effects unknown)
PNC-27
—05Administration Protocol
Parameter
ACE-031
PNC-27
1. Pharmaceutical status
ACE-031 is not FDA-approved or commercially available. Phase 2 development was discontinued in 2011 due to safety concerns. Any ACE-031 on the black market is unregulated research chemical.
PNC-27 has not been tested in human subjects. All data derive from in vitro cancer cell line studies and limited animal models. No approved clinical formulation, dosing protocol, or safety profile exists.Pincus 2024
2. Black market quality
12 of 14 tested black market ACE-031 products contained the target protein but also carried multiple unidentified protein contaminants detectable by SDS-PAGE. Two products contained no ACVR2B-immunoreactive material.Reichel 2025
In vitro studies used 10–100 μM PNC-27 dissolved in cell culture medium. Peptide was added directly to cancer cell cultures (pancreatic, breast, colon, ovarian, leukemia lines) and incubated for 24–72 hours.
3. Detection in sport
ACE-031 is prohibited under WADA S4.3 (Myostatin Inhibitors). Gel electrophoresis and Western blotting using ACVR2B-specific antibodies can detect the ~58.4 kDa protein in biological samples.Reichel 2025
Dual-labeled PNC-27 (green on N-terminus, red on C-terminus) demonstrated intact peptide binding to cancer cell membranes with combined yellow fluorescence at 30 minutes, persisting during cell lysis.Sookraj 2010
4. Clinical trial route
Phase 2 protocol used subcutaneous injections at weekly or biweekly intervals. Exact dosing protocols remain unpublished.
Cytotoxicity correlates directly with membrane HDM-2 expression levels. Blocking HDM-2's p53-binding domain (1-109) with monoclonal antibodies prevents PNC-27-induced necrosis.