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Scientists Discover RELMalpha Protein Protects Females Against Obesity

July 27, 2023
in Science
Scientists Discover RELMalpha Protein Protects Females Against Obesity
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Obesity Weight Loss Concept

Scientists have conducted a study using a mouse model to understand sex differences in obesity. They found that female mice, compared to males, are more resistant to obesity and inflammation due to a higher secretion of an immune protein called RELMalpha.  The study reveals a crucial ‘RELMalpha–eosinophil–macrophage axis’ in females, offering potential novel therapies to combat obesity.

UC Riverside mouse study describes mechanisms underlying sex differences for obesity.

A study at UC Riverside found that female mice are more resistant to obesity due to the immune protein RELMalpha. When the protein was deleted, the females were susceptible to obesity like males. The findings suggest potential new obesity treatments and emphasize the importance of considering sex differences in tackling metabolic diseases.

Associated with poorer health outcomes and reduced quality of life, obesity is on the rise in the United States. Currently, more than 30% of American adults are classified as obese. A risk factor for several diseases, including diabetes, cardiovascular disease, and COVID-19, obesity is an important and growing public health concern.

RELMalpha: A Protective Protein Against Obesity

Using a mouse model of high-fat diet-induced obesity, a team of scientists at the University of California, Riverside, has found that, compared to males, female mice are protected against obesity and inflammation because they secrete more of an immune protein called RELMalpha.

Meera Nair and Djurdjica Coss

Meera Nair (left) and Djurdjica Coss. Credit: UCR/Meera Nair

“Our study identifies immune cells and RELMalpha in causing these sex-specific differences in the immune response to obesity,” said Meera G. Nair, an associate professor of biomedical sciences in the School of Medicine, who co-led the study published in eLife with Djurdjica Coss, a professor of biomedical sciences.

The Role of RELMalpha

RELM, or resistin-like molecules, constitute a family of proteins secreted by mammals that are highly expressed in infectious and inflammatory diseases. One of these proteins, RELMalpha, is quickly triggered in the mouse body following infection and serves to protect the body’s tissues. It has a sequence and function similar to resistin in humans.

“RELMalpha regulates two immune cell types: the anti-inflammatory macrophage and the eosinophil,” Nair said. Macrophages and eosinophils are types of disease-fighting white blood cells but can be damaging to the body in the absence of infection. “In contrast, males expressed less RELMalpha, had less eosinophils, and had inflammatory macrophages that promoted obesity.”

Findings and Implications of the Study

When the researchers deleted RELMalpha in female mice, they found the mice were no longer protected from obesity, had fewer eosinophils, and had inflammatory macrophages — similar to male mice.

“However, we were able to reduce obesity in these female mice by treating them with eosinophils or with RELMalpha, suggesting promising therapeutic targets,” Nair said. “We are the first to map this pathway in females that protects against obesity.”

RELMalpha Research Team

Meera Nair (fifth from left) and Djurdjica Coss (third from right) and their research teams. Credit: UCR

The research team found RELMalpha deficiency had significant effects in males also, but to a lesser extent than females.

“In our experiments, female mice had higher levels of RELMalpha than males, which likely explains why RELMalpha deficiency affected females more than males,” Coss said. “The implications of our study are that consideration of sex differences is critical to tackle metabolic diseases such as obesity.”

Conclusion and Potential Therapies

According to Nair, the study is novel in showing a previously unrecognized role for RELMalpha in modulating metabolic and inflammatory responses during diet-induced obesity that is sex dependent.

“Our results highlight a critical ‘RELMalpha–eosinophil–macrophage axis’ that functions in females to protect from diet-induced obesity and inflammation,” she said. “Promoting these pathways could, therefore, provide novel therapies for combating obesity.”

Nair and Coss were joined in the study by Jiang Li, Rebecca E Ruggiero-Ruff, Yuxin He, Xinru Qiu, Nancy Lainez, Pedro Villa, and Adam Godzik of UCR.

The study was supported by grants to Nair and Coss from the National Institutes of Health.

Published in the journal eLife, the research paper is titled “Sexual dimorphism in obesity is governed by RELMα regulation of adipose macrophages and eosinophils.”

Reference: “Sexual dimorphism in obesity is governed by RELMα regulation of adipose macrophages and eosinophils” by Jiang Li, Rebecca E Ruggiero-Ruff, Yuxin He, Xinru Qiu, Nancy Lainez, Pedro Villa, Adam Godzik, Djurdjica Coss and Meera G Nair, 10 May 2023, eLife.
DOI: 10.7554/eLife.86001

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/scientists-discover-relmalpha-protein-protects-females-against-obesity/

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