a-klotho lr

At a Glance: Recombinant a-Klotho LR in Preclinical Research

Alpha-Klotho (a-Klotho) is an anti-aging research protein primary expressed in renal distal convoluted tubules, the choroid plexus of the brain, and parathyroid glands. Recombinant variants such as a-Klotho LR represent engineered or domain-isolated forms designed for extended stability and targeted signaling assays in experimental models.

In cell culture and animal models, a-Klotho acts as an essential obligate co-receptor for Fibroblast Growth Factor 23 (FGF23), governing phosphate homeostasis, vitamin D metabolism, and cellular oxidative stress pathways. Researchers frequently study a-Klotho LR to evaluate its modulating influence on Wnt signaling, insulin/IGF-1 pathway activity, and senescence-associated secretory phenotypes (SASP).

To ensure precise assay reproducibility, research laboratories must utilize alpha-Klotho preparations verified for peptide content, identity, and minimal endotoxin contamination. PX1 Research maintains stringent analytical controls, enabling investigators to order alpha-Klotho LR for laboratory research with complete lot-specific documentation.

What Is Recombinant a-Klotho LR?

The Klotho gene family encodes a single-pass transmembrane protein whose extracellular region comprises two internal repeats designated KL1 and KL2. Membrane-bound a-Klotho forms a functional complex with FGF receptors (FGFRs) to bind FGF23 with high affinity. Cell-surface metalloproteinases, specifically ADAM10 and ADAM17, cleave the extracellular domain, releasing soluble alpha-Klotho into circulation.

Recombinant a-Klotho LR (Long Range or Long-Recombinant domain construction) is synthesized to replicate or optimize the functional soluble domain for in vitro stability. Soluble a-Klotho functions independently of cell-surface FGFR binding, operating as a humoral factor that modulates ion channels, transporters, and cell-signaling cascades across remote organ systems.

In experimental biochemistry, recombinant a-Klotho LR allows researchers to dissect the independent enzymatic and hormonal properties of the soluble protein without confounding membrane-anchored signaling. Detailed characterizations of these domain fragments can be referenced in our expanded preclinical peptide research library.

Primary Mechanisms of Action in Preclinical Models

Preclinical studies indicate that a-Klotho LR operates through several distinct intracellular and cell-surface mechanisms:

1. **FGF23 Co-Receptor Signaling:** Membrane-bound and soluble forms associate with FGFR1c, FGFR3c, and FGFR4 to facilitate high-affinity FGF23 binding, driving downstream ERK1/2 phosphorylation and regulating renal phosphate transport via NaPi-2a/2c co-transporters.

2. **Wnt Pathway Inhibition:** Soluble a-Klotho directly binds to multiple Wnt ligands (including Wnt1, Wnt3a, and Wnt7a), suppressing canonical Wnt/beta-catenin signaling. Overactive Wnt signaling is linked to tissue fibrosis, cellular senescence, and oncogenic transformation in cell cultures.

3. **Attenuation of Oxidative Stress:** In vitro models show that a-Klotho administration enhances expression of manganese superoxide dismutase (MnSOD) by activating FOXO transcription factors, neutralizing reactive oxygen species (ROS) and mitigating mitochondrial damage.

4. **Inhibition of Insulin and IGF-1 Signaling:** Soluble a-Klotho induces resistance to insulin and IGF-1 signaling in cultured cells, a mechanism conserved across longevity-associated genetic models that prolong cellular lifespan.

Key Preclinical Research Applications for Alpha-Klotho

Investigative labs utilize a-Klotho LR across several specialized biological disciplines:

**Renal and Cardiovascular Physiology:** Researchers evaluate how soluble alpha-Klotho protects vascular endothelial cells from calcification and apoptosis induced by hyperphosphatemia and uremic toxins.

**Neurobiology and Cognitive Research:** Central nervous system models examine a-Klotho expression in the choroid plexus and its potential neuroprotective roles against neuroinflammation, synaptic loss, and amyloid-beta pathology.

**Cellular Senescence and Aging:** In vitro senescence assays test a-Klotho LR for its ability to reduce senescence markers (such as p16INK4a and p21) and clear harmful secretory factors in cultured fibroblasts and progenitor cells.

To explore complementary targets in longevity and metabolic research, investigators often combine a-Klotho studies with compounds like the SS-31 research peptide for mitochondrial optimization or the epitalon peptide for telomerase expression studies.

Comparing Research Reagents: Criteria for Vetting Alpha-Klotho LR

Given the structural complexity of recombinant proteins, selecting a reliable supplier is crucial for obtaining reproducible data. Laboratories should evaluate suppliers against strict analytical parameters:

**1. Purity Verification:** High-Performance Liquid Chromatography (HPLC) must demonstrate >95% single-peak purity to rule out degraded fragments.

**2. Identity Confirmation:** Mass Spectrometry (LC-MS or MALDI-TOF) must match the theoretical molecular weight of the recombinant a-Klotho LR construct.

**3. Endotoxin Quantification:** Limulus Amebocyte Lysate (LAL) testing should confirm endotoxin levels below 0.1 EU/µg to prevent non-specific inflammatory signaling in cell cultures.

**4. Lot Traceability:** Every vial must link directly to a batch-specific Certificate of Analysis (COA) generated by an independent third-party laboratory.

**5. Domestic Sourcing & Cold Chain handling:** USA synthesis and temperature-controlled storage eliminate protein denaturing during transit.

Red Flags in Commercial Alpha-Klotho Sourcing

Substandard peptide suppliers often jeopardize experimental integrity through inadequate quality control. Researchers should avoid vendors displaying the following operational red flags:

• **Generic COAs:** Certificates displaying recycled data or missing specific lot numbers and test dates.

• **Unverified Endotoxin Levels:** Absence of LAL assay results, which risks cell-toxicity or false-positive activation of immune receptors during in vitro protocols.

• **Ambiguous Sequence and Origin:** Lack of clear documentation regarding recombinant host expression systems (e.g., E. coli vs. HEK293) or exact amino acid boundaries.

• **Offshore Transit without Cold-Chain Protocols:** Direct drop-shipping from international brokers where ambient temperatures compromise tertiary protein structure.

To safeguard your data, review PX1 Research's catalog of fully verified reagents across our entire catalog of research peptides.

Laboratory Reconstitution and Storage Protocol

Recombinant proteins like a-Klotho LR require careful handling to maintain structural conformation and prevent aggregation during storage and assay preparation.

**Reconstitution Steps:**

1. Centrifuge the vial briefly prior to opening to collect lyophilized powder at the bottom.

2. Reconstitute in sterile, nuclease-free water or buffered solution (such as PBS, pH 7.4) to a working concentration of 0.1–1.0 mg/mL.

3. For extended stability in low-concentration working aliquots, include a carrier protein such as 0.1% Bovine Serum Albumin (BSA) or Human Serum Albumin (HSA).

4. Avoid vigorous vortexing; gently invert or swirl the vial to dissolve the powder completely.

**Storage Conditions:**

• **Lyophilized Powder:** Store at -20°C to -80°C upon receipt. Stable for up to 24 months under desiccated conditions.

• **Reconstituted Solution:** Aliquot into single-use microcentrifuge tubes to prevent freeze-thaw cycles. Store at -80°C for up to 3–6 months.

Interlinking Longevity & Metabolic Research Compounds

Topical research clusters in cellular aging and metabolic regulation frequently investigate a-Klotho alongside other targeted peptides. Combining recombinant proteins with synthetic peptides allows multi-pathway analysis of cellular homeostasis.

For example, researchers studying mitochondrial bioenergetics alongside Klotho-mediated ROS suppression often incorporate MOTS-c research peptides. Similarly, investigators evaluating cellular clearance pathways frequently utilize the FOXO4-DRI research peptide in conjunction with Klotho Wnt-inhibition models.

Academic institutions seeking large-scale quantities for multi-center studies can explore bulk availability through our specialized bulk peptide purchasing program.

Analytical Standards: Mass Spectrometry and HPLC Verification

Every batch of a-Klotho LR from PX1 Research undergoes rigorous analytical testing prior to release. Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) verifies sequence homogeneity and detects small peptide impurities or truncated variants.

Simultaneously, Electrospray Ionization Mass Spectrometry (ESI-MS) confirms the exact molecular mass of the full-length recombinant protein. By releasing lot-matched analytical reports directly to investigators, PX1 Research removes ambiguity from preclinical trial design.

Ordering from PX1 Research

PX1 Research is dedicated to supporting US-based laboratories, academic centers, and private research facilities with uncompromising reagent purity and swift logistics.

When you order from PX1 Research, your shipment includes:

• High-purity recombinant a-Klotho LR packaged in vacuum-sealed, sterile glass vials.

• Batch-specific third-party COA access detailing RP-HPLC, Mass Spectrometry, and LAL endotoxin metrics.

• Same-day dispatch for orders placed before 3:00 PM EST (Monday–Friday) from our California and Arizona fulfillment nodes.

• Tracked, temperature-monitored domestic transit ensuring reliable delivery.

To secure fully verified reagents for your lab, buy high-purity a-Klotho LR vials directly from PX1 Research today.