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Front Med 2020 Jan 15;6:331

Non-ionizing 405 nm light as a potential bactericidal technology for platelet safety: evaluation of in vitro bacterial inactivation and in vivo platelet recovery in severe combined immunodeficient mice.

Maclean M, Gelderman MP, Kulkarni S, Tomb RM, Stewart CF, Anderson JG, MacGregor SJ, Atreya CD


Bacterial contamination of ex vivo stored platelets is a cause of transfusion-transmitted infection. Violet-blue 405 nm light has recently demonstrated efficacy in reducing the bacterial burden in blood plasma, and its operational benefits such as non-ionizing nature, penetrability, and non-requirement for photosensitizing agents, provide a unique opportunity to develop this treatment for in situ treatment of ex vivo stored platelets as a tool for bacterial reduction. Sealed bags of platelet concentrates, seeded with low-level Staphylococcus aureus contamination, were 405 nm light-treated (3-10 mWcm(-2)) up to 8 h. Antimicrobial efficacy and dose efficiency was evaluated by quantification of the post-treatment surviving bacterial contamination levels. Platelets treated with 10 mWcm(-2) for 8 h were further evaluated for survival and recovery in severe combined immunodeficient (SCID) mice. Significant inactivation of bacteria in platelet concentrates was achieved using all irradiance levels, with 99.6-100% inactivation achieved by 8 h (P < 0.05). Analysis of applied dose demonstrated that lower irradiance levels generally resulted in significant decontamination at lower doses: 180 Jcm(-2)/10 mWcm(-2) (P = 0.008) compared to 43.2 Jcm(-2)/3 mWcm(-2) (P = 0.002). Additionally, the recovery of light-treated platelets, compared to non-treated platelets, in the murine model showed no significant differences (P = >0.05). This report paves the way for further comprehensive studies to test 405 nm light treatment as a bactericidal technology for stored platelets.

Category: Journal Article
PubMed ID: #32010702 DOI: 10.3389/fmed.2019.00331
PubMed Central ID: #PMC6974518
Includes FDA Authors from Scientific Area(s): Biologics
Entry Created: 2019-07-21 Entry Last Modified: 2020-02-09