Chenwei Duan1,2, Naila Cannes do Nascimento2,3, Sarah Calve1,4, Abigail Cox3, M Preeti Sivasankar1,2. 1. Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana, U.S.A. 2. Department of Speech, Language, and Hearing Sciences, Purdue University, West Lafayette, Indiana, U.S.A. 3. Department of Comparative Pathobiology, Purdue University, West Lafayette, Indiana, U.S.A. 4. Department of Mechanical Engineering, University of Colorado-Boulder, Boulder, Colorado, U.S.A.
Abstract
OBJECTIVES: A holistic understanding of the many ways that systemic dehydration affects vocal fold biology is still evolving. There are also myriad physiologically relevant methodologies to induce systemic dehydration. To untangle the effects of systemic dehydration on vocal fold biology, we need to utilize realistic, clinically translatable paradigms of systemic dehydration in lab animals. Restricted access to water accommodates clinical translation. We investigated whether systemic dehydration via reduced water intake would negatively affect vocal fold biology. STUDY DESIGN: Prospective, in vivo study design. METHODS: Male Sprague Dawley rats (N = 13) were provided 4 mL/100 g of water/day for 5 days, whereas male control rats (N = 8) were given ad lib access to water. Following euthanasia, tissues were processed for histological staining, gene expression, and protein assays. RESULTS: Renin gene expression level in kidneys increased significantly (P ≤ .05), validating dehydration. Dehydration induced by restricted water access downregulated the gene expression of interleukin-1α and desmoglein-1 (P ≤ .05). Hyaluronidase-2 gene expression increased after dehydration (P ≤ .05). The protein level of desmoglein-1 decreased after dehydration (P ≤ .05). Histological analyses suggested decreased hyaluronan (P ≤ .05) in the water-restricted rat vocal fold. CONCLUSION: Reduced daily water intake for just 5 days impairs vocal fold biology by disrupting inflammatory cytokine release, reducing plasma membrane integrity, and disrupting the hyaluronan network. This is the first study investigating the dehydrating effects of restricted water intake on vocal fold tissue in an in vivo model. LEVEL OF EVIDENCE: NA (prospective animal study). Laryngoscope, 131:839-845, 2021.
OBJECTIVES: A holistic understanding of the many ways that systemic dehydration affects vocal fold biology is still evolving. There are also myriad physiologically relevant methodologies to induce systemic dehydration. To untangle the effects of systemic dehydration on vocal fold biology, we need to utilize realistic, clinically translatable paradigms of systemic dehydration in lab animals. Restricted access to water accommodates clinical translation. We investigated whether systemic dehydration via reduced water intake would negatively affect vocal fold biology. STUDY DESIGN: Prospective, in vivo study design. METHODS: Male Sprague Dawley rats (N = 13) were provided 4 mL/100 g of water/day for 5 days, whereas male control rats (N = 8) were given ad lib access to water. Following euthanasia, tissues were processed for histological staining, gene expression, and protein assays. RESULTS:Renin gene expression level in kidneys increased significantly (P ≤ .05), validating dehydration. Dehydration induced by restricted water access downregulated the gene expression of interleukin-1α and desmoglein-1 (P ≤ .05). Hyaluronidase-2 gene expression increased after dehydration (P ≤ .05). The protein level of desmoglein-1 decreased after dehydration (P ≤ .05). Histological analyses suggested decreased hyaluronan (P ≤ .05) in the water-restricted rat vocal fold. CONCLUSION: Reduced daily water intake for just 5 days impairs vocal fold biology by disrupting inflammatory cytokine release, reducing plasma membrane integrity, and disrupting the hyaluronan network. This is the first study investigating the dehydrating effects of restricted water intake on vocal fold tissue in an in vivo model. LEVEL OF EVIDENCE: NA (prospective animal study). Laryngoscope, 131:839-845, 2021.
Authors: Naila Cannes do Nascimento; Andrea Pires Dos Santos; Rodrigo Mohallem; Uma K Aryal; Jun Xie; Abigail Cox; M Preeti Sivasankar Journal: J Proteomics Date: 2021-11-23 Impact factor: 4.044
Authors: Taylor W Bailey; Andrea Pires Dos Santos; Naila Cannes do Nascimento; Jun Xie; M Preeti Sivasankar; Abigail Cox Journal: Sci Rep Date: 2021-12-17 Impact factor: 4.996