Overview
Kidney Injury Molecule 1 (KIM-1) is a transmembrane glycoprotein that serves as a sensitive biomarker for detecting acute kidney injury (AKI) in rats. First identified in 1998, it is encoded by the HAVCR1 gene and belongs to the TIM family of proteins. KIM-1 is minimally expressed in healthy kidneys but shows rapid upregulation in proximal tubule epithelial cells following ischemic or toxic injury. In preclinical research, rat KIM-1 is particularly valuable for nephrotoxicity assessments during drug development. Its urinary excretion correlates with histological damage, making it superior to traditional markers like serum creatinine. Commercial KIM-1 reagents are typically supplied as recombinant proteins or antibodies for ELISA and immunohistochemistry applications.
Physical and Chemical Properties
Rat KIM-1 consists of an extracellular immunoglobulin variable domain, a mucin-rich region, and a transmembrane segment with a short cytoplasmic tail. The mature protein undergoes ectodomain shedding, releasing soluble fragments detectable in urine. Its molecular weight varies slightly (38-42 kDa) due to glycosylation differences. The protein is stable in neutral buffers but degrades under repeated freeze-thaw cycles or prolonged room temperature exposure. Recombinant forms used in research often include Fc tags (e.g., mouse IgG2a) for improved solubility and detection. Antibody binding epitopes are conformation-dependent, requiring proper folding for assay functionality.
Main Applications
In toxicology studies, KIM-1 measurement is incorporated into FDA-endorsed renal safety assessments for novel therapeutics. It helps distinguish adaptive responses from true injury in preclinical rat models. Pharmaceutical companies routinely monitor KIM-1 alongside traditional markers in 28-day repeat-dose studies. Academic researchers employ KIM-1 to investigate AKI mechanisms in ischemia-reperfusion, sepsis, or nephrotoxicant exposure models. Its early elevation (within 24 hours post-injury) enables timely intervention studies. Emerging applications include biomarker panels for chronic kidney disease progression and renal fibrosis monitoring.
Safety and Storage
KIM-1 reagents pose minimal biosafety risks (BSL-1). Standard laboratory practices suffice: wear gloves and avoid inhalation of lyophilized powder. Spills should be cleaned with 70% ethanol. Suppliers typically provide material safety data sheets (MSDS) specific to formulation buffers. For optimal stability, store lyophilized proteins at -20°C in desiccated conditions. Reconstituted solutions require aliquoting to avoid freeze-thaw damage; add carrier proteins (e.g., 0.1% BSA) if concentrations are <0.1 mg/mL. Monitor lot-specific storage recommendations—some antibody conjugates require light-sensitive handling.
B2B Procurement Guide
When sourcing rat KIM-1 reagents, prioritize vendors with ISO 13485 certification for consistent biomarker quality. Key specifications include: 1) Immunogen validation (full-length vs. ectodomain), 2) Cross-reactivity data (absence of mouse/human binding), and 3) Documentation of dynamic range in target matrices (urine/serum/tissue lysates). Bulk purchasers should request certificates of analysis (CoA) detailing endotoxin levels (<1 EU/µg), purity (SDS-PAGE verification), and functional testing results (e.g., spike-and-recovery in rat urine). Consider kit formats with pre-coated plates for high-throughput screening. Lead times for custom monoclonal antibody production typically range 3-6 months.
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