Overview
Asprosin is a recently identified adipokine hormone derived from the C-terminal cleavage of fibrillin-1 (FBN1), a structural protein. Discovered in 2016 through studies of neonatal progeroid syndrome, it functions as an endocrine signal between adipose tissue and the liver. This 30-40 kDa protein fragment is primarily secreted by white adipose tissue during fasting states, circulating in the blood to stimulate hepatic glucose release via cAMP signaling pathways. Unlike traditional adipokines like leptin, asprosin exhibits unique orexigenic (appetite-stimulating) properties by crossing the blood-brain barrier to activate AgRP neurons in the hypothalamus. Its discovery has opened new research avenues in metabolic regulation, particularly for conditions involving insulin resistance and abnormal energy homeostasis.
Physical and Chemical Properties
Asprosin exists as a glycosylated protein fragment with several conserved cysteine residues contributing to its tertiary structure. The bioactive form contains both N-linked and O-linked glycosylation sites, which may influence receptor binding affinity. Its isoelectric point is estimated around 5.5-6.0, making it slightly acidic under physiological conditions. In laboratory settings, recombinant asprosin is typically produced in mammalian expression systems (e.g., HEK293 cells) to ensure proper post-translational modifications. The protein demonstrates stability in neutral pH buffers but may degrade under repeated freeze-thaw cycles. Analytical characterization often employs Western blot (under reducing conditions) and ELISA, with commercial antibodies targeting specific epitopes near the C-terminus.
Main Applications
Current asprosin research focuses on two primary domains: metabolic disease mechanisms and therapeutic development. In basic science, it serves as a critical tool for studying hepatic glucose production pathways and hypothalamic feeding circuits. Knockout mouse models demonstrate its necessity for maintaining fasting glucose levels, while elevated asprosin correlates with insulin resistance in human studies. Therapeutically, neutralizing antibodies and peptide inhibitors targeting asprosin are under investigation for type 2 diabetes and obesity management. Several biotech companies have patented asprosin-modulating compounds, with preclinical data showing improved glycemic control. Diagnostic applications are also emerging, as serum asprosin levels may serve as a biomarker for metabolic syndrome severity.
Safety and Storage
As a research chemical, asprosin requires standard biosafety level 1 (BSL-1) handling precautions. Use personal protective equipment including gloves and lab coats when reconstituting lyophilized powder. Avoid generating aerosols during pipetting. For cell culture applications, ensure endotoxin testing (<1 EU/μg) to prevent unintended immune responses. Long-term storage should maintain lyophilized material at -20°C or below in desiccated conditions. Reconstituted solutions are stable for 1-2 weeks at 4°C when sterile-filtered (0.22 μm). For extended storage, aliquot and freeze at -80°C with carrier proteins (e.g., 0.1% BSA) to prevent surface adsorption. Avoid repeated freezing and thawing cycles, which can cause protein aggregation.
B2B Procurement Guide
When sourcing asprosin for research, prioritize vendors providing detailed certificates of analysis including mass spectrometry verification and biological activity data (typically measured by cAMP response assays). Recombinant human asprosin with >95% purity (SDS-PAGE) is essential for consistent experimental results. Some suppliers offer species-specific variants (mouse, rat) for translational studies. For bulk procurement (milligram quantities), request custom synthesis with endotoxin testing and sterile filtration. Lead times for GMP-grade material may exceed 8 weeks. Consider cold chain logistics—dry ice shipment is mandatory for active protein. Pricing tiers generally decrease at the 1mg+ scale, with academic discounts often available through university vendor programs.
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