The protective effect of sodium-L-ascorbyl-2 phosphate (As-2P), a stable form of ascorbic acid (AsA), against photodamage induced by a single dose of UVB exposure (290-320 nm, Max 312 nm) was investigated using cultured mouse skin. When the cultured skin was treated with various As-2P concentrations, the cutaneous AsA level increased in proportion to the As-2P concentration. After 3 h of incubation, the AsA level in the cultured skin treated with 2, 20 and 100 mM As-2P increased 1.03-, 2.17- and 6.27-fold, respectively, compared with that of the control skin. These results suggest that As-2P was transported into the cultured mouse skin where it was converted to AsA. After 3 h, the cutaneous AsA level in irradiated (20 kJ/m2) skin was depleted to a half of that in the control skin. However, the level in skin pretreated with 20 mM As-2P was maintained within normal limits, even after 24 h. Pretreatment with 20 mM As-2P significantly prevented such photodamage as sunburn cell formation, DNA fragmentation and lipid peroxidation, which were caused by a single dose of UVB irradiation. These results suggest that the protective effect of 20 mM As-2P on UVB-induced cutaneous damage is due to the maintenance of a normal As level by conversion of As-2P to As in skin tissue.
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http://dx.doi.org/10.1248/bpb.22.1301 | DOI Listing |
Research (Wash D C)
January 2025
Division of Biotechnology, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
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January 2025
Ajou University School of Medicine, Department of Brain Science, Suwon, Republic of Korea.
Spinal cord injury results in permanent loss of neurological functions due to severance of neural networks. Transplantation of neural stem cells holds promise to repair disrupted connections. Yet, ensuring the survival and integration of neural stem cells into the host neural circuit remains a formidable challenge.
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Department of Orthopedics, The Second Affiliated Hospital of Harbin Medical University, No. 246 Xuefu Road, Harbin, 150001, Heilongjiang Province, China.
Background: Osteoporosis (OP) is a systemic disease characterized by low bone mass. New progress has been made in the study of OP, such as lipid peroxidation. However, the role of lipid peroxides in osteoclast differentiation is still unclear.
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January 2025
Department of Anatomy and Neuroscience, Institute of Medicine, University of Tsukuba, 1-1- 1, Tennodai, Tsukuba, Ibaraki, 305-8577, Japan.
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Molecular Physiology, Center for Integrative Physiology and Molecular Medicine (CIPMM), University of Saarland, 66421, Homburg, Germany.
Oligodendrocyte precursor cells (OPCs) shape brain function through many non-canonical regulatory mechanisms beyond myelination. Here we show that OPCs form contacts with their processes on neuronal somata in a neuronal activity-dependent manner. These contacts facilitate exocytosis of neuronal lysosomes.
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