Alpha Klotho Lr
Alpha Klotho LR represents a specialized recombinant variant of the anti-aging protein Klotho, engineered for precise in vitro and animal research into metabolic, renal, and anti-senescence pathways. Investigated for its role as a required co-receptor for fibroblast growth factor 23 (FGF23) and an inhibitor of Wnt signaling, this recombinant peptide provides researchers with a targeted tool for elucidating cellular longevity mechanisms.
Quick answer
Alpha Klotho LR represents a specialized recombinant variant of the anti-aging protein Klotho, engineered for precise in vitro and animal research into metabolic, renal, and anti-senescence pathways. Investigated for its role as a required co-receptor for fibroblast growth factor 23 (FGF23) and an inhibitor of Wnt signaling, this recombinant peptide provides researchers with a targeted tool for elucidating cellular longevity mechanisms.
Key takeaways
- Alpha Klotho LR is a specialized recombinant protein fragment derived from the transmembrane anti-aging protein Alpha Klotho, engineered for in vitro and preclinical research into renal, metabolic, and cellular longevity pathways.
- The primary biochemical characterization of Alpha Klotho LR centers on its interaction with fibroblast growth factor receptor 1c (FGFR1c), FGFR3c, and FGFR4.
- Preclinical studies suggest that Alpha Klotho plays a pivotal protective role in mammalian renal architecture.
- In addition to its role as an FGF23 co-receptor, Alpha Klotho LR functions as a humoral factor capable of binding directly to multiple Wnt ligands, including Wnt1, Wnt3a, Wnt4, and Wnt5a.
Defining Alpha Klotho LR: Molecular Structure and Research Overview
Alpha Klotho LR is a specialized recombinant protein fragment derived from the transmembrane anti-aging protein Alpha Klotho, engineered for in vitro and preclinical research into renal, metabolic, and cellular longevity pathways. Functions primarily as an essential co-receptor for FGF23 signaling and a suppressor of oxidative stress pathways, serving as a bioanalytical tool for investigating phosphate homeostasis and senescence-associated protein cascades.
In endogenous biological systems, Alpha Klotho exists as both a single-pass transmembrane protein and a cleaved, soluble circulating form. The soluble extracellular domain contains two internal repeat regions, KL1 and KL2. The designated Alpha Klotho LR research compound isolated for laboratory assays mirrors key active motifs of this circulating form, enabling investigators to isolate signaling dynamics without the confounding variables introduced by transmembrane anchor domains.
Preclinical literature demonstrates that loss of Klotho expression correlates strongly with accelerated aging phenotypes in murine models, whereas overexpression extends lifespan and confers resistance to oxidative damage. Research utilizing recombinant Alpha Klotho variants focuses primarily on mapping its enzymatic activity, receptor binding kinetics, and cellular protective mechanisms in isolated tissue cultures and rodent models.
Receptor Dynamics and FGF23 Co-Receptor Complex Formation
The primary biochemical characterization of Alpha Klotho LR centers on its interaction with fibroblast growth factor receptor 1c (FGFR1c), FGFR3c, and FGFR4. Fibroblast growth factor 23 (FGF23) possesses low intrinsic affinity for standard FGFRs; binding of soluble or membrane-bound Alpha Klotho forms a binary receptor complex that dramatically increases affinity for FGF23, initiating downstream intracellular phosphorylation cascades.
In vitro binding assays indicate that upon assembly of the ternary FGFR-Klotho-FGF23 complex, activation of the extracellular signal-regulated kinase (ERK1/2) and downstream early growth response 1 (EGR1) pathways occurs. This mechanism regulates phosphate transport across renal tubular cells by downregulating the expression of sodium-dependent phosphate cotransporters (NaPi-2a and NaPi-2c).
Investigators exploring calcium and vitamin D metabolism utilize recombinant Alpha Klotho LR to evaluate 1-alpha-hydroxylase expression within renal epithelial cultures. By quantifying altered mRNA transcripts via quantitative PCR, research teams can map the precise stoichiometry and binding kinetics required for optimal co-receptor signaling. Detailed technical protocols for setup are detailed in our research peptide documentation portal.
Preclinical Evidence in Renal and Metabolic Pathways
Preclinical studies suggest that Alpha Klotho plays a pivotal protective role in mammalian renal architecture. In rodent models of ischemia-reperfusion injury and unilateral ureteral obstruction, exogenous administration of soluble Klotho protein fragments attenuated interstitial fibrosis, reduced apoptosis of renal tubular cells, and suppressed pro-inflammatory cytokine expression including TNF-alpha and IL-6.
Beyond renal tissue, researchers examine Alpha Klotho LR for its influence on systemic metabolic homeostasis. In vitro assays using pancreatic beta-cell lines indicate that exposure to recombinant Klotho variants preserves mitochondrial membrane potential and reduces glucose-induced oxidative stress.
In models of metabolic dysfunction, data suggest that soluble Klotho fragments modulate insulin signaling by inhibiting autophosphorylation of the insulin receptor and insulin-like growth factor 1 (IGF-1) receptor. This cross-talk suggests an evolutionary mechanism where downregulation of nutrient-sensing pathways by Klotho contributes to cellular stress resistance and lifespan extension.
Modulation of Wnt Signaling and Cellular Senescence
In addition to its role as an FGF23 co-receptor, Alpha Klotho LR functions as a humoral factor capable of binding directly to multiple Wnt ligands, including Wnt1, Wnt3a, Wnt4, and Wnt5a. In vitro binding experiments show that Klotho sequesters Wnt ligands, preventing their interaction with Frizzled receptors and inhibiting downstream beta-catenin translocation to the nucleus.
Excessive canonical Wnt/beta-catenin signaling is linked to stem cell depletion, tissue fibrosis, and accelerated cellular senescence. By blocking canonical Wnt activation, recombinant Alpha Klotho preserves stem cell pluripotency in cellular assays and mitigates senescent secretory phenotypes.
Laboratory evaluation of senescent human umbilical vein endothelial cells (HUVECs) exposed to Alpha Klotho LR demonstrated reduced expression of senescence-associated beta-galactosidase (SA-beta-gal) and restored nitric oxide synthase (eNOS) activity. These findings highlight the compound's value as a benchmark standard in longevity research, detailed further in our comparative guide on klotho protein signaling pathways.
Comparative Analysis: Alpha Klotho LR vs. Related Longevity Compounds
When designing preclinical protocols focused on cellular preservation, cellular senescence, or mitochondrial integrity, researchers frequently contrast Alpha Klotho LR with other prominent targeted peptides. While Klotho primary targets extracellular Wnt sequestration and FGFR co-receptor signaling, compounds such as epitalon target telomerase activation and transcriptional modulation, and mots-c modulates nuclear gene expression via mitochondrial-derived signaling.
Similarly, peptides like ghk-cu influence gene expression related to tissue remodeling and copper-dependent enzyme regulation, whereas ss-31 acts directly within the inner mitochondrial membrane to optimize ATP generation. Understanding these distinct pathways allows researchers to select the precise mechanism required for their specific cell culture or animal model assays.
The following matrix summarizes the comparative research parameters across these compounds:
In Vitro Reconstitution, Handling, and Storage Protocols
Recombinant proteins such as Alpha Klotho LR require stringent handling protocols to preserve tertiary structure and biological activity. Lyophilized proteins should be stored at -20°C or -80°C upon arrival in a frost-free freezer. Avoid repeated freeze-thaw cycles, which induce protein denaturation and aggregation.
Reconstitution should be performed under sterile laminar flow hoods using sterile carrier-containing buffers, such as phosphate-buffered saline (PBS) containing 0.1% bovine serum albumin (BSA) or human serum albumin (HSA). The addition of a carrier protein prevents nonspecific binding of Alpha Klotho LR to plastic tube surfaces during dilution.
After reconstitution, initial aliquots should be prepared at stock concentrations suited for assay protocols (e.g., 100 ug/mL) and stored at -80°C. Working aliquots stored at 4°C are stable for up to 7 days depending on buffer conditions. Never vortex recombinant protein solutions; dissolve by gentle inversion or micro-pipetting to avoid mechanical shear forces.
Evaluating Supplier Quality: Analytical Purity and Testing Standards
Because biological assays are sensitive to contaminants, structural misfolding, and degradation, acquiring verified analytical grade compounds is essential. High-performance liquid chromatography (RP-HPLC) combined with mass spectrometry (MS) ensures chemical purity, correct molecular mass, and sequence integrity.
In cell culture and preclinical models, endotoxin contamination presents a major confounding factor. Endotoxins (lipopolysaccharides) provoke non-specific inflammatory responses via Toll-like receptor 4 (TLR4), masking true peptide effects. Quality reference materials must undergo strict Limulus Amebocyte Lysate (LAL) testing to confirm endotoxin levels below established limits (< 0.1 EU/ug).
PX1 Research provides fully transparent validation for every batch. Institutional researchers can verify documentation across our catalog of research peptides to ensure batch-to-batch consistency and reproducible laboratory data.
Institutional Sourcing and Verification via PX1 Research
PX1 Research manufactures and distributes premium research compounds operating out of state-of-the-art facilities located in California and Arizona. Every lot of Alpha Klotho LR undergoes rigorous independent testing at an ISO 17025 accredited laboratory to verify sequence identity and purity.
Key quality control indicators provided with each shipment include lot-specific Certificates of Analysis (COA), RP-HPLC chromatograms, electrospray ionization mass spectrometry (ESI-MS) spectra, and endotoxin assay reports. This level of documentation ensures compliance with strict institutional oversight and journal peer-review standards.
For high-throughput screening applications or large-scale animal study protocols, academic and commercial research laboratories can establish dedicated accounts through our wholesale lab account portal to access volume supply and continuous lot-reservation capabilities.
Frequently Asked Questions
What is Alpha Klotho LR intended for in laboratory settings?
Alpha Klotho LR is a research-grade recombinant protein intended strictly for in vitro assays, biochemical binding studies, and animal model research into renal, metabolic, and senescence pathways. It is not for human or veterinary use.
How does Alpha Klotho LR function as an FGF23 co-receptor?
Alpha Klotho LR binds to fibroblast growth factor receptors (FGFR1c, FGFR3c, FGFR4) to form a high-affinity binary complex capable of binding FGF23, which initiates downstream ERK1/2 signaling and modulates phosphate transporter gene expression.
What reconstituted buffer is recommended for Alpha Klotho LR?
It is recommended to reconstitute Alpha Klotho LR in sterile PBS containing 0.1% BSA or HSA as a carrier protein to prevent non-specific adsorption to polypropylene tubes. Avoid vortexing to prevent protein shearing.
What analytical purity standards apply to PX1 Research Alpha Klotho LR?
PX1 Research verifies Alpha Klotho LR using RP-HPLC for purity (>95%), ESI-MS for molecular mass confirmation, and LAL assays to confirm low endotoxin levels (< 0.1 EU/ug).
How should reconstituted Alpha Klotho LR aliquots be stored long-term?
Reconstituted stock aliquots should be frozen immediately at -80°C. Avoid repeated freeze-thaw cycles, as freeze-thaw stress leads to protein aggregation and loss of bioactivity.
How does Alpha Klotho LR interact with the Wnt signaling pathway?
Preclinical data show that soluble Alpha Klotho binds directly to Wnt ligands (such as Wnt1 and Wnt3a), preventing ligand interaction with Frizzled receptors and inhibiting downstream beta-catenin translocation.
Where does PX1 Research manufacture and ship research peptides?
PX1 Research manufactures and ships research compounds within the USA, utilizing facilities in California and Arizona with same-day shipping on orders placed Monday through Friday.
Are lot-specific COAs available for institutional compliance?
Yes, every lot of Alpha Klotho LR includes a downloadable, lot-specific Certificate of Analysis detailing HPLC, MS, and endotoxin testing performed by an independent ISO 17025 accredited laboratory.
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