RVD-hemopressin(alpha), a naturally occurring brain peptide that negatively modulates CB1 receptors, reduced food intake in rats over 14 days but did not change body weight, possibly because it simultaneously reduced energy expenditure.
Read this if you're interested in how the brain's own cannabinoid peptides regulate appetite and metabolism.
Reduced food intake but no weight loss: metabolic compensation offset caloric deficit
What the researchers found
Daily injections of RVD-hemopressin(alpha) (10 nmol) for 14 days reduced food intake in rats. However, body weight was unaffected despite the decreased eating. The researchers found that this paradox may be explained by decreased expression of UCP-1 (uncoupling protein 1) in brown adipose tissue, which would reduce thermogenic energy expenditure, offsetting the caloric deficit from eating less.
At the brain level, RVD-hemopressin(alpha) downregulated POMC gene expression and norepinephrine levels in the hypothalamus, providing a neuromodulatory mechanism for the appetite effects.
Why it matters
The brain produces its own peptides that modulate cannabinoid receptors. Understanding how these natural regulators affect appetite and metabolism could lead to more physiological approaches to treating obesity, working with the body's own cannabinoid control systems rather than against them.
The numbers in context
RVD-hemopressin(alpha) 10 nmol daily for 14 days. Decreased food intake. No body weight change. Decreased UCP-1 in brown adipose tissue. Decreased POMC and norepinephrine in hypothalamus.
How the study worked
Rats received 14 daily intraperitoneal injections of RVD-hemopressin(alpha) (10 nmol). Food intake and body weight were monitored. Brain tissue was analyzed for POMC gene expression and norepinephrine levels. Brown adipose tissue was assessed for UCP-1 gene expression.
What this study cannot tell us
Animal study with direct peptide injection. The peptide likely does not cross the blood-brain barrier well, limiting its therapeutic potential. Only 14 days of treatment were assessed. The absence of weight loss despite reduced eating limits the translational value for obesity treatment.
How to read the evidence
Animal study using injected peptides. Provides mechanistic insight but limited by the non-physiological delivery route and absence of the desired weight loss outcome.
When this study was published
Published in 2017. Research on endogenous cannabinoid-modulating peptides and their metabolic effects continues.
The bigger picture
The disconnect between reduced food intake and stable body weight reveals that appetite and metabolism are linked through the cannabinoid system. Simply reducing eating through cannabinoid modulation may be counteracted by metabolic slowdown, a finding relevant to any weight-loss strategy targeting the endocannabinoid system.
Questions still open
- Could the metabolic compensation be overcome with combination therapies? Would longer treatment eventually produce weight loss? Do humans produce similar cannabinoid-modulating peptides with comparable appetite effects?
Common questions
Why didn't the rats lose weight if they ate less?
What is RVD-hemopressin?
Read the original research
Anorexigenic effects induced by RVD-hemopressin(α) administration.
Pharmacological reports : PR, 69(6), 1402-1407
Citation
Ferrante, Claudio; Recinella, Lucia; Leone, Sheila; Chiavaroli, Annalisa; Di Nisio, Chiara; Martinotti, Sara; Mollica, Adriano; Macedonio, Giorgia; Stefanucci, Azzurra; Dvorácskó, Szabolcs; Tömböly, Csaba; De Petrocellis, Luciano; Vacca, Michele; Brunetti, Luigi; Orlando, Giustino. (2017). Anorexigenic effects induced by RVD-hemopressin(α) administration.. Pharmacological reports : PR, 69(6), 1402-1407. https://doi.org/10.1016/j.pharep.2017.05.015
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