Increase of neuronal sprouting and migration using 780 nm laser phototherapy as procedure for cell therapy

Shimon Rochklnd, Dalia El-Ani, Zvi Nevo, Abraham Shahar

Research output: Contribution to journalArticlepeer-review

Abstract

Background and Objectives: The present study focuses on the effect of 780 nm laser irradiation on the growth of embryonic rat brain cultures embedded in NVR-Gel (cross-linked hyaluronic acid with adhesive molecule laminin and several growth factors). Dissociated neuronal cells were first grown in suspension attached to cylindrical micro-carriers (MCs). The formed floating cell-MC aggregates were subsequently transferred into stationary cultures in gel and then laser treated. The response of neuronal growth following laser irradiation was investigated. Materials and Methods: Whole brains were dissected from 16 days Sprague - Dawley rat embryos. Cells were mechanically dissociated, using narrow pipettes, and seeded on positively charged cylindrical MCs. After 4-14 days in suspension, the formed floating cell-MC aggregates were seeded as stationary cultures in NVR-Gel. Single cell-MC aggregates were either irradiated with near-infrared 780 nm laser beam for 1, 4, or 7 minutes, or cultured without irradiation. Laser powers were 10,30, 50, 110,160, 200, and 250 mW. Results: 780 nm laser irradiation accelerated fiber sprouting and neuronal cell migration from the aggregates. Furthermore, unlike control cultures, the irradiated cultures (mainly after 1 minute irradiation of 50 mW) were already established after a short time of cultivation. They contained a much higher number of large size neurons (P<0.01), which formed dense branched interconnected networks of thick neuronal fibers. Conclusions: 780 nm laser phototherapy of embryonic rat brain cultures embedded in hyaluronic acid - laminin gel and attached to positively charged cylindrical MCs, stimulated migration and fiber sprouting of neuronal cells aggregates, developed large size neurons with dense branched interconnected network of neuronal fibers and, therefore, can be considered as potential procedure for cell therapy of neuronal injury or disease.

Original languageEnglish
Pages (from-to)277-281
Number of pages5
JournalLasers in Surgery and Medicine
Volume41
Issue number4
DOIs
StatePublished - Apr 2009

Keywords

  • Axonal sprouting
  • Cross-linked hyaluronic acid with laminin gel
  • Embryonic nerve cells
  • Low power laser irradiation
  • Microcarriers

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