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Targeting thermogenesis and related pathways in anti-obesity drug discovery
John C Clapham1, Jonathan R S Arch
1AstraZeneca R&D, Alderley Park, Macclesfield and Clore Laboratory, University of Buckingham, Buckingham, UK. john.clapham@astrazeneca.com
Abstract:
The health consequences of the obesity epidemic are a huge burden on patients and society. Yet it remains an unmet therapeutic need. Lifestyle or behaviour modification, although desirable, seems to benefit only a few and bariatric surgery is not an option for all and not without risks. Nevertheless, bariatric surgery is currently the gold standard in terms of weight loss therapy and any weight loss agent will be in combination with management of lifestyle modification. Sadly, there is a poor history for the pharmacological treatment of obesity and repeated safety concerns have attracted intense regulatory scrutiny. Indeed, recent market withdrawals leave us with just one agent approved for the long term treatment of obesity and that is only mildly efficacious in terms of weight loss, although it is beneficial in terms of metabolic health. There are two broad pharmacological approaches that can be applied in obesity drug discovery: reduce intake (or absorption) or increase expenditure (thermogenesis) of calories. In this review we will look at the latter approach. We will cover regulatory requirements and the rationale for this approach. We believe that post-obese subjects display abnormal metabolic responses to weight loss that almost inevitably leads to weight regain. We will then explore a number of approaches that potentially increase thermogenesis in humans. The challenge we have is in accumulating enough human data to validate this approach using drugs.
Insights
This review explores increasing calorie expenditure (thermogenesis) as a strategy for obesity pharmacotherapy. It highlights challenges in validating thermogenic drugs with human data, despite the unmet need for effective obesity treatments.
Area of Science:
- Pharmacology and metabolic research focusing on obesity treatment.
- Exploration of thermogenesis as a therapeutic target for weight management.
Background:
- The global obesity epidemic presents a significant unmet therapeutic need.
- Current treatments like lifestyle modification and bariatric surgery have limitations.
- The history of obesity pharmacotherapy is marked by safety concerns and regulatory withdrawals.
Purpose of the Study:
- To review the pharmacological approach of increasing calorie expenditure (thermogenesis) for obesity.
- To discuss regulatory requirements and the scientific rationale for targeting thermogenesis.
- To examine potential strategies for increasing human thermogenesis.
Main Methods:
- Review of existing literature on obesity pharmacotherapy and thermogenesis.
- Analysis of the challenges in validating thermogenic drugs in human studies.
- Discussion of abnormal metabolic responses post-weight loss contributing to regain.
Main Results:
- Limited success and safety concerns plague current pharmacological obesity treatments.
- Increasing thermogenesis is a promising, albeit challenging, approach.
- Accumulating sufficient human data to validate thermogenic drug efficacy remains a key hurdle.
Conclusions:
- Targeting thermogenesis offers a potential avenue for novel obesity pharmacotherapy.
- Overcoming challenges in human data acquisition is crucial for drug development.
- Further research is needed to validate thermogenic strategies for long-term obesity management.
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