Human Primary Proximal Tubular Epithelial Cells

Description

Kidney cell studies often require a physiologically relevant human model that more closely represents native renal tubular biology than continuously cultured or immortalized cell lines. Changes in epithelial morphology, declining growth performance and loss of tissue-specific characteristics can complicate nephrotoxicity assays, renal disease studies and drug-response experiments. Human Primary Proximal Tubular Epithelial Cells provide researchers with a human-derived primary kidney cell model for controlled in vitro investigation of proximal tubular epithelial function.

These human primary proximal tubular epithelial cells are isolated from human proximal tubular tissue and expanded in gelatin pre-coated tissue culture flasks using complete epithelial cell growth medium. Cells are harvested at passage 3 and cryopreserved for delivery. Each vial contains 0.5 × 10⁶ cells per mL.

The cells are characterized by immunofluorescence staining for epithelial-associated markers, including E-cadherin and ZO-1. E-cadherin is associated with epithelial cell-cell adhesion, while ZO-1 is commonly used to evaluate tight-junction organization. This characterization supports their use as primary renal proximal tubule epithelial cells in kidney cell culture and epithelial biology research.

Under the specified culture conditions, the cells can typically be expanded for 3–5 passages using a recommended split ratio of 1:2. Repeated freezing and thawing are not recommended because additional freeze-thaw cycles may reduce cell recovery, viability and experimental consistency.

Specifications

Features

• Human-derived primary proximal tubular epithelial cells isolated from proximal tubular tissue

• Supplied as cryopreserved passage 3 cells

• Each vial contains 0.5 × 10⁶ cells per mL

• Characterized by immunofluorescence staining for E-cadherin and ZO-1

• Expandable for approximately 3–5 passages under the recommended culture conditions

• Recommended subculture ratio of 1:2

• Suitable for human kidney epithelial cell and renal proximal tubule research

• Tested negative for mycoplasma, bacteria, yeast, fungi, HIV-1, hepatitis B and hepatitis C

• Compatible with gelatin-coated tissue culture vessels

• Supplied for research use only

Suggested Medium

H6621 Complete Epithelial Cell Medium with Kit, 500 mL

Use of the recommended complete epithelial cell medium, gelatin-based coating solution and associated culture reagents helps support attachment, recovery and expansion of these primary renal epithelial cells. Only the amount of medium required for immediate use should be pre-warmed to 37°C. Repeated warming of complete growth medium is not recommended.

Applications

Nephrotoxicity and Renal Toxicity Research

Human primary proximal tubular epithelial cells may be used as an in vitro human kidney model for studying cellular responses to compounds that affect renal tubular epithelium. Relevant experimental endpoints may include cell viability, morphology, oxidative stress, inflammatory signaling and epithelial injury. Their human origin makes them suitable for nephrotoxicity assay development and renal toxicity research where species-specific cellular responses are important.

Drug Screening and Compound Evaluation

These primary kidney cells can support drug screening workflows designed to evaluate compound effects on human renal epithelial cells. Researchers may use them for dose-response studies, cytotoxicity testing, mechanism-of-action experiments and comparative evaluation of candidate compounds under controlled cell culture conditions.

Renal Drug Transport Studies

The proximal tubule plays an important role in renal handling of endogenous molecules and xenobiotics. Human renal proximal tubule cells can be incorporated into experimental workflows investigating uptake, secretion, intracellular accumulation and compound-associated epithelial responses. Expression of individual transporters should be confirmed for each experimental lot and culture condition before use in transporter-specific assays.

Acute Kidney Injury Research

Primary renal proximal tubule epithelial cells may be used to develop in vitro models related to acute kidney injury, including chemically induced injury, oxidative stress, inflammatory stimulation and recovery after cellular damage. Experimental conditions should be optimized according to the selected injury mechanism and assay endpoint.

Chronic Kidney Disease and Renal Fibrosis Research

Researchers can use human kidney epithelial cells to investigate signaling pathways associated with chronic tubular injury, epithelial dysfunction and profibrotic responses. These studies may include analysis of changes in cell morphology, junction-associated proteins, inflammatory mediators and extracellular matrix-related signaling.

Diabetic Kidney Disease Research

Human proximal tubular epithelial cells may be incorporated into experimental models examining the cellular effects of altered glucose conditions, oxidative stress and inflammatory signaling relevant to diabetic kidney disease. Medium composition, exposure duration and osmotic controls should be defined for each study.

Epithelial Barrier and Tight-Junction Studies

Characterization with E-cadherin and ZO-1 supports use of these cells in studies of epithelial organization, cell-cell adhesion and tight-junction-associated biology. Researchers may monitor marker localization, monolayer formation and changes in epithelial phenotype after treatment or environmental stress.

Renal Physiology and Kidney Biology

These human primary kidney cells provide a research model for studying proximal tubular epithelial growth, attachment, morphology and response to extracellular stimuli. They are suitable for renal physiology, kidney biology and comparative primary cell culture studies.

Inflammation and Cellular Stress Studies

The cells may be used to examine renal epithelial responses to inflammatory mediators, oxidative stress and other experimentally controlled stimuli. Readouts may include gene expression, protein expression, cytokine-associated responses, cell survival and morphological changes.

Advanced Kidney Cell Culture Models

Following method-specific optimization, human primary proximal tubular epithelial cells may be evaluated for use in co-culture, three-dimensional culture, microphysiological systems and kidney-on-a-chip research. Suitability for a particular platform depends on coating, medium, passage number, seeding density and device design.

Recommended Culture Conditions

Cell Recovery from Cryopreserved Vial

1. Pre-warm the required amount of complete epithelial cell culture medium to 37°C.

2. Quickly thaw the cryovial in a 37°C water bath for less than 1 minute, stopping when only a few small ice crystals remain.

3. Remove the vial immediately and disinfect the exterior with 70% ethanol.

4. Transfer the vial contents into a sterile 15 mL centrifuge tube containing 5 mL of pre-warmed medium.

5. Rinse the cryovial with an additional 0.5–1 mL of medium and add the rinse to the centrifuge tube.

6. Centrifuge the cells at 200 × g for 5 minutes to remove residual cryopreservation medium.

7. Carefully remove the supernatant and resuspend the cell pellet in 5 mL of complete growth medium.

8. Seed the cell suspension into a T25 flask pre-coated with gelatin-based coating solution.

9. Incubate at 37°C with 5% CO₂ for 12–16 hours.

10. Change the medium on the second day and every 24 hours thereafter.

11. Observe the cells daily for attachment, morphology, contamination and confluency.

Subculture Guidelines

1. Remove the spent culture medium.

2. Wash the adherent cells twice with room-temperature 1X PBS without calcium and magnesium.

3. Add pre-warmed 0.25% Trypsin-EDTA and incubate at 37°C for approximately 3–5 minutes.

4. Monitor detachment under a microscope and gently tap the culture vessel if required.

5. Add complete culture medium containing serum to neutralize the trypsin.

6. Gently pipette the cell suspension to achieve an even suspension without excessive mechanical stress.

7. Seed the cells into freshly gelatin-coated culture vessels at the recommended 1:2 split ratio.

8. Return the cells to a humidified 37°C, 5% CO₂ incubator.

9. Change the medium on the second day and every 24 hours thereafter.

Primary cells should not be allowed to remain over-confluent for extended periods unless required by a validated experimental protocol. Passage number, confluency and culture duration should be recorded because these variables may affect cellular phenotype and assay performance.

Quality Control

No testing procedure can guarantee the complete absence of infectious agents. Handle all human primary cells using appropriate biosafety procedures and treat them as potentially biohazardous materials.

Storage and Shipping

Cryopreserved cells are shipped on dry ice. Immediately upon receipt, transfer the frozen vial to the vapor or liquid phase of a liquid nitrogen storage system at approximately −180°C until ready for use.

Do not store primary cells in a −20°C or −80°C freezer for long-term storage. Temporary storage at inappropriate temperatures may reduce cell viability and recovery. Repeated freezing and thawing are not recommended.

Live-cell shipment may be available upon request. Live cultures should be placed in the appropriate incubator and handled according to the supplied live-cell receiving instructions immediately after delivery.

Documents

H-6015 Product Data Sheet

Primary Cell Culture Protocol

Publications

Cell Genomics. 2022;2(11):100191

Nature Communications. 2023;14:4737

Frequently Asked Questions

Handling and Safety

All primary cell culture procedures should be performed in a certified biological safety cabinet using aseptic technique. Culture media, supplements and reagents should be sterile. Treat all human-derived primary cells as potentially infectious because no testing method can guarantee the complete absence of infectious agents.

Appropriate institutional biosafety procedures, personal protective equipment and waste-disposal practices must be followed. Researchers are responsible for determining the biosafety level and handling requirements applicable to their institution and experimental workflow.

Disclaimer

For Research Use Only. Not for use in humans, clinical diagnosis, in vitro diagnostic procedures or therapeutic applications. Product performance depends on appropriate storage, handling, medium, coating, passage number and adherence to the recommended cell culture protocol.