A Histological Dye as a Potential Strategy to Boost Fat Metabolism
Document Type
Event
Faculty Mentor
Aaron Brown
Abstract
Methylene blue (MB) is a small redox-active molecule historically used as a histological stain and as a treatment for methemoglobinemia, a condition that impairs oxygen delivery in the blood. In addition to these uses, MB can influence mitochondrial metabolism by facilitating electron transfer within the mitochondrial respiratory chain, thereby enhancing mitochondrial respiration and cellular energy production. Because mitochondrial function plays a central role in metabolic health, MB has been investigated as a potential therapeutic strategy for several conditions such as neurodegenerative diseases, ischemic injury, and metabolic disorders. Brown adipocytes are specialized fat cells that dissipate energy as heat through mitochondrial uncoupling mediated by uncoupling protein 1 (UCP1), a thermogenic process that helps maintain body temperature when organisms are exposed to cold. Because this process releases energy as heat rather than storing it as ATP, activating thermogenic adipocytes increases caloric expenditure and has emerged as a promising strategy to counteract obesity and metabolic disease. The goal of this study was to determine whether MB can activate thermogenic gene programs in adipocytes and thereby promote increased energy expenditure. To test this hypothesis, we expanded and differentiated mouse and human-derived brown adipocyte precursors in culture and treated the fully differentiated adipocytes with a range of MB concentrations. Following short-term treatment (4-24 hours), expression of thermogenic and mitochondrial genes was measured by quantitative PCR. Our preliminary results demonstrate that short-term exposure to low doses of MB increases expression of thermogenic genes in both mouse and human brown adipocytes, including Ucp1, consistent with activation of thermogenic gene programs. Ongoing studies are examining whether longer-term MB treatment maintains thermogenic activity by measuring thermogenic protein expression, including UCP1, and by directly quantifying cellular energy expenditure using highly sensitive isothermal microcalorimetry. Together, these studies will determine whether MB can modulate thermogenic adipocyte biology and promote increased energy expenditure as a potential strategy to combat obesity and metabolic disease.
A Histological Dye as a Potential Strategy to Boost Fat Metabolism
Methylene blue (MB) is a small redox-active molecule historically used as a histological stain and as a treatment for methemoglobinemia, a condition that impairs oxygen delivery in the blood. In addition to these uses, MB can influence mitochondrial metabolism by facilitating electron transfer within the mitochondrial respiratory chain, thereby enhancing mitochondrial respiration and cellular energy production. Because mitochondrial function plays a central role in metabolic health, MB has been investigated as a potential therapeutic strategy for several conditions such as neurodegenerative diseases, ischemic injury, and metabolic disorders. Brown adipocytes are specialized fat cells that dissipate energy as heat through mitochondrial uncoupling mediated by uncoupling protein 1 (UCP1), a thermogenic process that helps maintain body temperature when organisms are exposed to cold. Because this process releases energy as heat rather than storing it as ATP, activating thermogenic adipocytes increases caloric expenditure and has emerged as a promising strategy to counteract obesity and metabolic disease. The goal of this study was to determine whether MB can activate thermogenic gene programs in adipocytes and thereby promote increased energy expenditure. To test this hypothesis, we expanded and differentiated mouse and human-derived brown adipocyte precursors in culture and treated the fully differentiated adipocytes with a range of MB concentrations. Following short-term treatment (4-24 hours), expression of thermogenic and mitochondrial genes was measured by quantitative PCR. Our preliminary results demonstrate that short-term exposure to low doses of MB increases expression of thermogenic genes in both mouse and human brown adipocytes, including Ucp1, consistent with activation of thermogenic gene programs. Ongoing studies are examining whether longer-term MB treatment maintains thermogenic activity by measuring thermogenic protein expression, including UCP1, and by directly quantifying cellular energy expenditure using highly sensitive isothermal microcalorimetry. Together, these studies will determine whether MB can modulate thermogenic adipocyte biology and promote increased energy expenditure as a potential strategy to combat obesity and metabolic disease.
