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J Plast Surg Hand Surg. 2018 Nov 16:1-7. doi: 10.1080/2000656X.2018.1523178. [Epub ahead of print]

FGF-2-containing dalteparin/protamine nanoparticles (FGF-2&D/P NPs) ameliorate UV-induced skin photoaging in hairless mice.

Author information

1
a Department of Plastic and Reconstructive Surgery , New Tokyo Hospital , Chiba , Japan.
2
b Division of Biomedical Engineering , Research Institute, National Defense Medical College , Tokorozawa , Japan.
3
c Department of Plastic and Reconstructive Surgery , New Tokyo Hospital , Chiba , Japan.

Abstract

UVB exposure penetrates deeply into the dermis to alter skin barrier function, which is a primary factor in skin photoaging. We previously reported that dalteparin and protamine nanoparticles (D/P NPs) are effective carriers of FGF-2. This study aimed to examine the ability of FGF-2-containing D/P NPs (FGF-2&D/P NPs) to ameliorate UVB-induced skin photoaging in hairless mice. Dorsal skin of HR-1 hairless mice were exposed to UVB irradiation 5 days/week for 8 weeks (UV (+): final total, 2700 mJ/cm2). Mice were divided into four groups: Non-UVB (UV (-)) + saline, UV (+) + saline, UV (+) + FGF-2&D/P NPs, UV (+) + FGF-2, and UV (+) + D/P NPs, and following UVB irradiation, FGF-2&D/P NPs, FGF-2, and D/P NPs were applied to the groups of mice just after each UVB irradiation. Each group was subjected to evaluation of skin changes (elasticity), and histological examination using hematoxylin & eosin and terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL) staining. UVB irradiation of mice significantly induced a decline in elasticity and acanthosis, which was alleviated by application of FGF-2&D/P NPs. Furthermore, TUNEL-staining showed the proportions of apoptotic dermal fibroblast cells (DFCs) and epidermal keratinocyte cells (EKCs) in the UV (+) + FGF-2&D/P NPs group were significantly lower than those in the UV (+) + saline, UV (+) + FGF-2, and UV (+) + D/P NPs groups. Thus, FGF-2&D/P NPs may be effective in preventing skin photoaging accelerated by UVB irradiation such as declining elasticity, acanthosis, and apoptosis of DFCs and EKCs.

KEYWORDS:

D/P NP; FGF-2; UV-induced photoaging; apoptosis; skin

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