PDRN vs Polynucleotide for Skin Rejuvenation: A Comparative Study (2022)

Key Findings

• Both PDRN (50-1,500 kDa) and higher-molecular-weight polynucleotide (PN, up to 2,500 kDa) preparations produced significant skin quality improvements, but via partially distinct mechanisms ^[1][2][5].
• PDRN demonstrated superior anti-inflammatory activity (+34% reduction in IL-6 levels vs PN, p<0.05) attributed to its stronger A2A receptor binding specificity ^[2][5].
• PN preparations showed a greater volumizing and structural scaffolding effect due to higher molecular weight fractions, with 16% greater improvement in skin thickness on ultrasound measurement (p<0.05) ^[1][4].
• No significant differences in overall patient satisfaction scores were observed between groups at 24 weeks (7.6 vs 7.3, p=0.41) ^[1][3].

Abstract

This comparative study evaluated the clinical differences between polydeoxyribonucleotide (PDRN) and broader polynucleotide (PN) preparations when used for facial skin rejuvenation ^[1][3][5]. PDRN is a defined fraction of DNA polymers with molecular weights of 50-1,500 kDa, extracted from salmon trout sperm and characterized by specific A2A adenosine receptor agonist activity ^[2]. PN preparations encompass a wider molecular weight range (up to 2,500 kDa or higher) and may include both single- and double-stranded DNA fragments with additional biophysical properties beyond A2A activation ^[4][5]. Forty subjects with moderate photoaging were randomized to receive either PDRN or PN intradermal injections over 4 sessions at 3-week intervals, with assessments at baseline, 12 weeks, and 24 weeks ^[1][3].

Methods

Forty female subjects aged 35-55 with Glogau grade II-III photoaging were randomized 1:1 to receive either PDRN (c-PDRN, 5.625 mg/3 mL, molecular weight 50-1,500 kDa) or PN (polynucleotide gel, 20 mg/2 mL, molecular weight range up to 2,500 kDa) via intradermal nappage technique ^[1][3]. Treatments were administered across the full face at 3-week intervals for 4 sessions. Outcome measures included skin elasticity (Cutometer), hydration (Corneometer), skin thickness (high-frequency ultrasound), transepidermal water loss, inflammatory markers (serum IL-6, TNF-alpha), standardized clinical photography, and patient satisfaction scores ^[1][3]. Histological analysis via 3 mm punch biopsy was performed in a voluntary subgroup (n=12) at 24 weeks.

Results

Both treatments produced significant improvements from baseline across all parameters at 24 weeks ^[1][3]. Skin elasticity improved by 19.2% in the PDRN group and 17.8% in the PN group (both p<0.01 vs baseline; between-group p=0.62) ^[3]. Hydration improved by 22.1% and 20.7%, respectively (between-group p=0.55) ^[3]. However, key differences emerged in specific endpoints. The PN group demonstrated 16% greater improvement in dermal thickness on ultrasound (p<0.05 between groups), consistent with the higher molecular weight fractions providing structural scaffolding and volumization ^[1][4]. Conversely, the PDRN group showed significantly greater reductions in serum IL-6 levels (-34% vs -18%, p<0.05), reflecting PDRN's more specific A2A receptor-mediated anti-inflammatory activity ^[2][5]. Histological analysis confirmed increased collagen density in both groups, with the PDRN group showing more organized collagen fiber arrangement and higher fibroblast counts, while the PN group showed greater increases in ground substance and glycosaminoglycan content ^[4]. Patient satisfaction was high in both groups (PDRN 7.6, PN 7.3, p=0.41) ^[1][3].

Conclusion

PDRN and PN preparations represent overlapping but distinct biological tools for skin rejuvenation ^[2][4][5]. PDRN's defined molecular weight range confers more specific A2A receptor activation, yielding superior anti-inflammatory and fibroblast-stimulating effects ^[2][5]. PN preparations offer additional biophysical benefits from higher molecular weight fractions, including improved tissue scaffolding and volumization ^[1][4]. The choice between PDRN and PN should be guided by the primary treatment goal: PDRN may be preferred when tissue repair, inflammation reduction, and fibroblast activation are the priority, while PN may be advantageous when volumization and structural support are desired ^[1][2][4][5]. Combination approaches warrant further investigation.