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Novel Dual-Target Bimagrumab and Semaglutide Achieve Fat Loss Without Muscle Loss

Release date: 2025-07-25 View count: 11

 

Weight loss is no longer just about "eating less and moving more." In recent years, targeted drug therapies for weight loss have become a significant trend in metabolic medicine. Results from the BELIEVE IIb phase study, presented at the 85th Annual Meeting of the American Diabetes Association (ADA) in 2025, show that Semaglutide combined with Bimagrumab outperforms single-drug therapy in reducing fat mass among overweight and obese individuals, while significantly minimizing lean mass loss. In other words, this combination not only aids in fat loss but also preserves or even increases muscle mass! So, how exactly do these drugs work in the body?

Title and Key Points from the 2025 American Diabetes Association (ADA) Publication

Fig 1. Title and Key Points from the 2025 American Diabetes Association (ADA) Publication

Focus on Two Key Targets:

GLP-1 Receptor (Semaglutide Target)

Semaglutide, a GLP-1 receptor agonist, mimics the action of the incretin hormone (GLP-1):

  • Suppresses appetite and delays gastric emptying
  • Enhances insulin secretion and reduces glucagon levels
  • Ultimately reduces total energy intake, stabilizes blood sugar, and promotes weight loss

However, the weight loss effect of GLP-1 drugs is not entirely specific to fat tissue. Multiple studies indicate that a portion of the total weight loss includes lean mass (muscle), posing potential risks to long-term metabolic health.

Activin Type II Receptor (Bimagrumab Target)

Bimagrumab is a monoclonal antibody targeting Activin Type II receptors (ActRIIA/ActRIIB), blocking signaling from TGF-β superfamily members such as myostatin and Activin A.

This pathway negatively regulates skeletal muscle growth. By antagonizing this signaling pathway, Bimagrumab lifts the inhibition on muscle formation, achieving:

  • Increased lean mass
  • Reduced fat deposition
  • Improved overall basal metabolic rate

Research Data:

Treatment Weight Loss Composition Muscle Changes Waist Circumference Change
Semaglutide Monotherapy 71.8% of weight loss from fat Accompanied by muscle loss Moderate improvement
Bimagrumab Monotherapy 100% of weight loss from fat 2.5% increase in lean mass Significant improvement
Combination Therapy 92.8% of weight loss from fat Muscle mass largely preserved Average waist reduction of 21 cm

The study concludes that combination therapy significantly improves body composition, with weight loss of higher metabolic quality, offering strong potential for long-term intervention.

Cellular Signaling Targets and Metabolic Effects of Anti-Activin Type II Receptor Antibody Bimagrumab

Fig 2. Cellular Signaling Targets and Metabolic Effects of Anti-Activin Type II Receptor Antibody Bimagrumab

Advances in Related Target Research:

Target Representative Drugs Mechanism Research Significance
GLP-1 Semaglutide, Liraglutide GLP-1, an incretin hormone, promotes insulin secretion, delays gastric emptying, and suppresses appetite via the central nervous system, reducing energy intake. A gold standard in obesity treatment.
ActRII Bimagrumab Inhibiting ActRII signaling promotes muscle synthesis and preserves muscle mass. Provides new insights into preventing muscle loss in weight management.
GIP Tirzepatide GIP, another incretin hormone, synergizes with GLP-1 to enhance insulin secretion and fat metabolism. Dual agonists represent a key direction for future obesity treatments.
MC4R Setmelanotide MC4R, located in the hypothalamus, is a key appetite-regulating receptor, reducing appetite when activated. Setmelanotide, the first FDA-approved MC4R agonist, targets rare genetic obesity with precision.
Glucagon Cotadutide, Retatrutide Stimulates glycogenolysis and gluconeogenesis during hypoglycemia, increases blood glucose, promotes fat breakdown, fatty acid oxidation, energy expenditure, and suppresses appetite. GLP-1/Glucagon dual agonists and GLP-1/GIP/Glucagon triple agonists.
Amylin Pramlintide, Cagrilintide, Retatrutide Suppresses appetite, delays gastric emptying, and inhibits glucagon secretion. Retatrutide (triple agonist) incorporates the Amylin signaling pathway, achieving nearly 24% weight loss.
AMPK Metformin AMPK, a cellular energy sensor, promotes fat oxidation and inhibits fat synthesis and glucose production when activated. AMPK activators are under exploration, suitable for long-term metabolic regulation.
CB1 Rimonabant Central appetite regulation target; blocking it reduces appetite. Rimonabant was withdrawn due to psychiatric side effects.
FGF21   A metabolic regulatory hormone that promotes fat breakdown, thermogenesis, and improves insulin sensitivity. Promising new target for metabolic syndrome and obesity treatment.
CD47   Enhances thermogenesis and fat oxidation while suppressing obesity-related inflammation. A potential new target for fat loss without compromising metabolism, with multifaceted functions in energy metabolism, anti-inflammation, and insulin sensitivity.
UCP1   Present in brown adipose tissue, promotes thermogenesis to burn fat. Activating UCP1 is a new direction for boosting basal metabolism.

Future weight loss treatments are no longer just about "losing weight" but about achieving "high-quality weight loss"—reducing fat while preserving muscle, which is the core of sustainable health.

abinScience, a supplier focused on life science research, was founded in Strasbourg, France, leveraging the region's exceptional research and innovation ecosystem to specialize in the development and production of high-quality life science reagents. For the targets mentioned above, abinScience provides high-quality research-grade reagents.

GLP-1

Type Catalog No. Product Name
Antibody HP899014 Anti-Semaglutide (GLP-1 analogue) Polyclonal Antibody
Kit DP899018 Semaglutide ELISA Kit
AP899018 Anti-Semaglutide ELISA Kit

ActRII

Type Catalog No. Product Name
Antibody HB949016 Research Grade Bimagrumab
Kit DB949018 Bimagrumab ELISA Kit

GIP

Type Catalog No. Product Name
Protein HY040012 Recombinant Human GIP Protein, N-His
JN028012 Recombinant Porphyromonas gingivalis rgpB/Gingipain R2 Protein, N-His
HT451012 Recombinant Human GIPC1 Protein, N-His
HP426012 Recombinant Human GADD45GIP1 Protein, N-His
MW595011 Recombinant Mouse GIPR/GIP-R Protein, C-His
MW595012 Recombinant Mouse GIPR/GIP-R Protein, N-His
HW595012 Recombinant Human GIPR/GIP-R Protein, N-His
Antibody HW595026 Research Grade GLP1-like peptide conjugated to Anti-Human GIPR Antibody (AMG 133)
HY040014 Anti-GIP Polyclonal Antibody
JN028014 Anti-Porphyromonas gingivalis rgpB/Gingipain R2 Polyclonal Antibody
HT451014 Anti-Human GIPC1 Polyclonal Antibody
HP426014 Anti-Human GADD45GIP1 Polyclonal Antibody
MW595014 Anti-Mouse GIPR/GIP-R Polyclonal Antibody
HW595014 Anti-Human GIPR/GIP-R Polyclonal Antibody
MW595013 Anti-Mouse GIPR/GIP-R Antibody (SAA0400)
MW595010 InVivoMAb Anti-Mouse GIPR/GIP-R (Iv0037)
HW595013 Anti-Human GIPR/GIP-R Antibody (SAA1449)
HY040013 Anti-Human GIP Antibody (SAA1567)
HW595010 InVivoMAb Anti-Human GIPR/GIP-R Antibody (Iv0211)

MC4R

Type Catalog No. Product Name
Antibody HB871013 Anti-Human MC4R Nanobody (SAA0796)
HB871023 Anti-Human MC4R Nanobody (SAA1276)

Glucagon

Type Catalog No. Product Name
Protein HF737012 Recombinant Human GCG Protein, N-His
MW547011 Recombinant Mouse GCGR Protein, C-Fc
Antibody HW547207 Anti-Human GCGR Antibody (SAA0133)
HW547107 Anti-Human GCGR Antibody (SAA0132)
MW547107 Anti-Mouse GCGR Antibody (mAb1)
HW547117 Anti-Human GCGR Antibody (SAA0132), FITC
HW547217 Anti-Human GCGR Antibody (SAA0133), FITC
MW547117 Anti-Mouse GCGR Antibody (mAb1), FITC
HW547137 Anti-Human GCGR Antibody (SAA0132), APC
HW547237 Anti-Human GCGR Antibody (SAA0133), APC
MW547137 Anti-Mouse GCGR Antibody (mAb1), APC
HW547147 Anti-Human GCGR Antibody (SAA0132), PerCP
HW547247 Anti-Human GCGR Antibody (SAA0133), PerCP
MW547147 Anti-Mouse GCGR Antibody (mAb1), PerCP
HW547127 Anti-Human GCGR Antibody (SAA0132), PE
HW547227 Anti-Human GCGR Antibody (SAA0133), PE
MW547127 Anti-Mouse GCGR Antibody (mAb1), PE
HF737014 Anti-GCG Polyclonal Antibody

Amylin

Type Catalog No. Product Name
Protein HY419012 Recombinant Human IAPP Protein, N-His-SUMO
Antibody HY419016 Research Grade Anti-Human IAPP (NI-203)
HY419013 Anti-Human IAPP Antibody (SAA0538)
HY419014 Anti-Human IAPP Polyclonal Antibody

AMPK

Type Catalog No. Product Name
Protein HC365012 Recombinant Human PRKAA1/AMPK alpha 1 Protein, N-His
Antibody HC365014 Anti-PRKAA1/AMPK alpha 1 Polyclonal Antibody

CB1

Type Catalog No. Product Name
Protein HB822012 Recombinant Human CNR1/CB1 Protein, N-GST & C-His
Antibody HB822026 Research Grade Anti-Human CNR1/CB1 (GFB-024)
HB822127 Anti-Human CNR1 Antibody (SAA0121), PE
HB822147 Anti-Human CNR1 Antibody (SAA0121), PerCP
HB822137 Anti-Human CNR1 Antibody (S,AA0121), APC
HB822117 Anti-Human CNR1 Antibody (SAA0121), FITC
HB822107 Anti-Human CNR1 Antibody (SAA0121)
HB822043 Anti-Cannabinoid receptor 1 Antibody (L112/22)
HB822023 Anti-Cannabinoid receptor 1 Antibody (L112/26)
HB822033 Anti-Cannabinoid receptor 1 Antibody (L112/49)
HB822010 InVivoMAb Anti-Human CNR1/CB1 Nanobody (5D12)
HB822020 InVivoMAb Anti-Human CNR1/CB1 Nanobody (5G11)
HB822030 InVivoMAb Anti-Human CNR1/CB1 Nanobody (6B7)
HB822013 Anti-Human CNR1/CB1 Nanobody (SAA1274)
HB822014 Anti-Human CNR1/CB1 Polyclonal Antibody

FGF21

Type Catalog No. Product Name
Protein HV802012 Recombinant Human FGF21 Protein, N-His
MV802012 Recombinant Mouse FGF21 Protein, N-His
ZV802011 Recombinant Cynomolgus monkey FGF21 Protein, C-His
HV802011 Recombinant Human FGF21 Protein, C-His
HV802022 Recombinant Human FGF21 Protein, C-HSA-His
HV802032 Recombinant Human FGF21 Protein, N-His-SUMO
HV802021 Recombinant Human FGF21 Protein, N-Fc
MV802022 Recombinant Mouse FGF21 Protein, N-His-SUMO & C-Strep
Antibody HV802026 Research Grade Anti-Human FGF21 (ARX618)
HV802016 Research Grade Anti-Human FGF21 (CVX-343)
HV802010 InVivoMAb Anti-Human FGF21 (Iv0067)
HV802107 Anti-Human FGF21 Antibody (SAA0440)
HV802117 Anti-Human FGF21 Antibody (SAA0440), FITC
HV802137 Anti-Human FGF21 Antibody (SAA0440), APC
HV802147 Anti-Human FGF21 Antibody (SAA0440), PerCP
HV802127 Anti-Human FGF21 Antibody (SAA0440), PE
MV802014 Anti-Mouse FGF21 Polyclonal Antibody
HV802014 Anti-Human FGF21 Polyclonal Antibody
HV802013 Anti-Human FGF21 Antibody (SAA2062)
HV802023 Anti-Human FGF21 Antibody (SAA2063)

UCP1

Type Catalog No. Product Name
Protein HB024012 Recombinant Human UCP1 Protein, N-His
Antibody HB024014 Anti-UCP1 Polyclonal Antibody

 

Reference: 

Kanbay M, Siriopol D, Copur S, et al. Effect of Bimagrumab on body composition: a systematic review and meta-analysis. Aging Clin Exp Res. 2024;36(1):185. Published 2024 Sep 9. doi:10.1007/s40520-024-02825-4

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