Wrestling with Weight Loss
The Dangers of a Weight-Loss Drug
Continuing Studies and Executive Education
In this interrupted case study, a young wrestler considers purchasing 2,4-dinitrophenol (DNP) online as a means to drop weight quickly. However, a finding that it may have killed someone concerns him. Through progressive disclosure of information, students expand their understanding of membrane permeability and the proton motive force in mitochondria to understand how DNP acts in mitochondria and how it may lead to various physiological effects. Follow-up assignments use knowledge gained in the case to understand mitochondrial thermogenesis in brown fat function and human evolution. The case may be used as a stand-alone exercise in a classroom or be paired with a laboratory investigation using isolated plant mitochondria. It is suitable for an introductory cell biology course for biology majors and non-majors.
- Know the order and linkage of the biochemical processes involved in ATP synthesis in mitochondria (glycolysis, TCA cycle, electron transport chain, proton pumping, ATP synthase activity)
- Be able to describe how mitochondria may generate heat to maintain body temperature.
- Apply concepts underlying mitochondrial function to the mechanism of action of a specific diet pill.
- Be able to extract data from a graph, and use that data to make inferences about the action of DNP.
- Relate fundamental principles of mitochondrial function to their own health.
KeywordsDNP; 2,4–dinitrophenol; mitochondria; mitochondrion; permeability; proton motive force; proton gradient; energy transfer; ATP; uncoupler; substance use
Educational LevelUndergraduate upper division
Type / MethodsDilemma/Decision, Discussion, Interrupted, Laboratory
Subject HeadingsCell Biology | Molecular Biology | Biology (General) |
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Teaching notes are intended to help teachers select and adopt a case. They typically include a summary of the case, teaching objectives, information about the intended audience, details about how the case may be taught, and a list of references and resources.
The case includes a set of three PowerPoint slides with animations of the diagrams given to students. They are intended to be shown in class between Parts II and III and Parts III and IV of the case.