The Zonation of Hepatic Lipid Metabolism: Exploring the Evolution of the Current Model of Understanding

Abstract

The purpose of this study was to conduct a literature review to explore the evolution of the current understanding of the zonation of hepatic lipid metabolism. Though much is known about zonation of other hepatic metabolic processes, there is limited research into lipid zonation. Towards this aim, a comprehensive literature review was conducted to investigate relevant studies dedicated to hepatic lipid zonation. The methods and findings of the studies were catalogued and compared in order to determine which results were consistent and which needed further study and exploration to be considered reliable. Ultimately, this review revealed that much of today’s understanding of hepatic lipid zonation is predicated on the findings of several studies by Katz et al. in the early 1980s. Though there were a handful of other studies by other investigators, other data was deemed unreliable due to its reliance on digitonin perfusion, an experimental method that was proven to provide aberrant results due to comparisons drawn between incomparable study samples. Ultimately, while it appears that lipogenesis tends to occur in pericentral hepatocytes while beta oxidation occurs in periportal hepatocytes, further research is needed to elucidate the impact of various physiological factors (age, sex, breed of study subject, feeding state, etc.) on these zonation patterns. This work is crucial as the number of disorders and diseases that impact hepatic lipid zonation continues to rise. A greater understanding of the foundational principles of hepatic lipid zonation will allow for more targeted clinical interventions and improve health outcomes for affected individuals.