Mr. Patrick Breeding Profile

Patrick Breeding

at Univ of Maine

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Proceedings Article | 22 February 2019 Presentation + Paper

Exploratory investigation of the spatial relationships of collagen and nerves in subcutaneous white adipose tissue (scWAT) using 2-photon microscopy

Patrick Breeding, Magdalena Blaszkiewicz, Kristy Townsend, Andre Khalil, Karissa Tilbury

Proceedings Volume 10882, 1088218 (2019) https://doi.org/10.1117/12.2510753

KEYWORDS: Tissues, Collagen, Nerve, Microscopy, Second-harmonic generation, Imaging systems, Image analysis, Biomedical optics, Astrophysics, Skin

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In obesity, subcutaneous white adipose tissue (scWAT) is often marked by reduced adipogenesis, hypoxia, adipocyte hypertrophy, and impaired lipolysis, all of which contribute to overall metabolic dysfunction. The role of the peripheral nervous system is appreciated in the control of WAT lipolysis; sympathetic denervation in WAT blocks lipolysis to a variety of lipolytic stimuli. Yet, we believe additional processes and work is needed to more fully understand adipose hypertrophy. Obese adipose tissue is fibrotic with excess deposition of collagen, yet there is limited work demonstrating the impact of fibrosis on overall tissues structure and peripheral nerves of the scWAT. Here we present a multiphoton approach to image both the peripheral nerves labeled with Alexa 488 and collagen via Second Harmonic Generation (SHG) imaging to investigate the impact of obesity and related fibrosis. The degree of colocalization between the nerve and collagen tissues was examined using both the Pearson’s coefficient and a recently adapted astrophysics technique, the Metric Space Technique (MST). In preliminary findings, both colocalization approaches demonstrated an increase colocalization of nerve and collagen in the aged and obese mice. The MST technique has multiple output functions that are used to examine morphological features such as structure of the nerve/collagen network as well as the circularity of these structures. Both colocalization techniques showed different in the obese mice and indicated a more diffuse circular nerve/collagen network. Collectively, these metrics provide important quantification of the nerve/collagen interaction and the role of the peripheral nervous function in maintaining appropriate adipose function.

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