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  • KSBNS 2024

Article

Original Article

Exp Neurobiol 2024; 33(1): 25-35

Published online February 29, 2024

https://doi.org/10.5607/en23030

© The Korean Society for Brain and Neural Sciences

Intranasal Administration of BDNF Improves Recovery and Promotes Neural Plasticity in a Neonatal Mouse Model of Hypoxic Ischemia

Serena-Kaye Sims1,2, Madelynne Saddow1,2, Lilly McGonegal1,2 and Catrina Sims-Robinson1,3*

1Department of Neurology, Medical University of South Carolina, Charleston, SC 29425,
2Department of Biology, College of Charleston, Charleston, SC 29424,
3Ralph H Johnson Veterans Affairs Medical Center, Charleston, SC 29401, USA

Correspondence to: *To whom correspondence should be addressed.
TEL: 1 (843)-792-0851, FAX: 1 (843) 876-1220
e-mail: robinsoc@musc.edu

Received: September 2, 2023; Revised: January 18, 2024; Accepted: February 9, 2024

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

The benefit of intranasal brain derived neurotrophic factor (BDNF) treatment on cognitive function in a neonatal postnatal day 7 (P7) mouse model of hypoxic ischemia (HI) was explored. Intranasal delivery is attractive in that it can promote widespread distribution of BDNF within both the brain and spinal cord. In this study we evaluated the effectiveness of intranasal BDNF to improve cognitive recovery following HI. HI is induced via ligation of the right carotid artery followed by a 45-minute exposure to an 8% oxygen/ 92% nitrogen mixture in an enclosed chamber. Male and female pups were subjected to a 2-hour hypothermia in a temperature-controlled chamber as a standard of care. A solution of saline (control) or recombinant human BDNF (Harlan Laboratories) was administered with a Gilson pipette at the same time each day for 7 days into each nasal cavity in awake mice beginning 24 hours after HI. We evaluated cognitive recovery using the novel object recognition (NOR) and western analysis to analyze neuro-markers and brain health such as synaptophysin and microtubule associated protein -2 (MAP2). The objective of this study was to evaluate the role and therapeutic potential of BDNF in neonatal HI recovery. Our results indicate that intranasal BDNF delivered within 24 hours after HI improved object discrimination at both 28 and 42 days after HI. Our results also demonstrate increased synaptophysin and MAP2 at day 42 in HI animals that received intranasal BDNF treatment compared to HI animals that were administered saline.

Graphical Abstract


Keywords: Drug administration, Neural plasticity, Neurodevelopment