TSE PhenoMaster_M Metabolic Cage System
| Brand | TSE Systems |
|---|---|
| Origin | Germany |
| Model | PhenoMaster_M |
| Application | Long-term, non-invasive metabolic phenotyping of small rodents (mice and rats) |
| Measurement Principle | Indirect calorimetry (O₂ consumption & CO₂ production via zirconia O₂ sensor and NDIR CO₂ sensor) combined with integrated behavioral and physiological monitoring |
| Channel Capacity | Up to 256 independently configurable cages |
| Gas Flow Control | Individual high-flow mass flow controllers per cage (PULL/PUSH selectable) |
| Data Acquisition | Raw binary time-series data (user-configurable sampling interval), full audit trail support |
| Compliance | Designed for GLP-compliant studies |
Overview
The TSE PhenoMaster_M Metabolic Cage System is a modular, research-grade indirect calorimetry platform engineered for longitudinal, high-fidelity metabolic phenotyping of mice and rats under near-physiological housing conditions. At its core, the system applies the principle of open-circuit respirometry: precise quantification of oxygen consumption (VO₂) and carbon dioxide production (VCO₂) across individually ventilated cages, enabling calculation of energy expenditure, respiratory exchange ratio (RER), and substrate utilization kinetics. Unlike single-parameter monitoring devices, PhenoMaster_M integrates real-time gas analysis with synchronized acquisition of ingestive behavior (food/water intake), body mass, spontaneous locomotor activity (XYZ optical tracking), excreta collection (urine/feces separation), and optional telemetry integration. Its architecture supports both standard sequential gas sampling and true parallel real-time measurement—each cage equipped with dedicated zirconia-based O₂ and NDIR CO₂ sensors—ensuring temporal alignment of all physiological and behavioral parameters at 1-second resolution.
Key Features
- Modular Scalability: Configurable from 2 to 256 independent monitoring channels; each cage operates as a self-contained experimental unit with individual gas flow control, sensor calibration, and data timestamping.
- High-Fidelity Gas Analysis: Zirconia electrochemical O₂ sensors and non-dispersive infrared (NDIR) CO₂ detectors deliver stable, low-drift measurements compliant with ISO 8573-1 purity class 4 for compressed air systems used in animal housing.
- Dual-Mode Acquisition: Select between standard sequential sampling (optimized for throughput across large cohorts) or parallel real-time mode (1 Hz per cage), preserving transient events such as meal initiation, micro-arousals, or acute drug-induced metabolic shifts.
- Integrated Behavioral Quantification: XYZ optical frame captures horizontal ambulation, rearing frequency, zone preference, circadian distribution of activity, and sleep-wake architecture without physical tethering or restraint stress.
- Excreta Management System: TSE-engineered urine/feces separation cages feature hydrophobic, umbrella-shaped internal walls to minimize wall adhesion and maximize collection efficiency—critical for downstream metabolomics or hormone assays.
- Raw Binary Data Export: Continuous, unprocessed binary streams (not aggregated summaries) are stored locally and exportable for third-party analysis (e.g., MATLAB, Python, R), supporting reproducibility, meta-analysis, and journal-level raw-data deposition requirements.
Sample Compatibility & Compliance
The PhenoMaster_M accommodates standard laboratory rodent strains (C57BL/6, BALB/c, Sprague-Dawley, Wistar) and transgenic models across weight ranges typical for mice (15–40 g) and rats (150–500 g). Cage dimensions and airflow profiles are validated per OECD Test Guideline 443 (Extended One-Generation Reproductive Toxicity Study) and align with AAALAC International housing standards for ventilation uniformity and ammonia accumulation limits. All hardware components—including gas lines, sensor housings, and cage materials—meet EU RoHS Directive 2011/65/EU and are certified free of leachable endocrine disruptors (e.g., BPA, phthalates). When deployed with validated software configurations and electronic signature workflows, the system supports audit-ready documentation for GLP, GCP, and FDA 21 CFR Part 11 compliance.
Software & Data Management
PhenoMaster Control & Analysis Suite (v5.x) provides unified control of all hardware modules via a centralized GUI. Experimental protocols—including light/dark cycles, feeding schedules, and stimulus triggers—are programmable with sub-minute temporal precision. The software enforces role-based access control, automated backup, and immutable audit logs recording every parameter change, user login, and data export event. Integrated analysis tools compute derived metrics including resting metabolic rate (RMR), diet-induced thermogenesis (DIT), activity-adjusted energy expenditure, and RER diurnal amplitude. Data exports comply with MIAME/MINSEQE metadata standards and support direct import into GraphPad Prism, SAS JMP, or custom bioinformatics pipelines. Optional API integration enables bidirectional communication with LIMS or ELN systems.
Applications
- Preclinical evaluation of anti-obesity therapeutics targeting mitochondrial uncoupling, lipolysis, or central appetite regulation.
- Longitudinal assessment of metabolic inflexibility in genetic models of type 2 diabetes (e.g., db/db, ob/ob) under controlled dietary challenges.
- Toxicokinetic studies requiring simultaneous quantification of energy balance shifts and organ-specific toxicity endpoints.
- Chronobiology research investigating circadian misalignment effects on substrate oxidation rhythms and sleep architecture.
- Pharmacodynamic profiling of CNS-active compounds where locomotor output must be decoupled from caloric expenditure.
- Standardized phenotyping in international consortia (e.g., IMPC, EUMODIC) adhering to SOPs for metabolic trait harmonization.
FAQ
What is the minimum recommended cage occupancy for reliable RER calculation?
A single animal per cage is required; group housing invalidates individual gas exchange attribution due to intersubject variability in ventilation and positioning.
Can PhenoMaster_M integrate with implantable telemetry systems?
Yes—via TTL-triggered synchronization and analog/digital I/O ports compatible with leading telemetry platforms (e.g., Data Sciences International, EMKA Technologies) for concurrent ECG, core temperature, and blood pressure correlation.
Is calibration traceable to NIST standards?
Gas analyzers ship with factory calibration certificates referencing NIST-traceable gas mixtures (±0.1% O₂, ±0.05% CO₂); field recalibration kits include certified reference gases with full uncertainty budgets.
How is cage air exchange rate maintained during high-activity periods?
Each cage employs a closed-loop mass flow controller that dynamically adjusts inlet flow (up to 2 L/min) to maintain constant differential pressure across the cage, preventing CO₂ buildup even during peak locomotor bursts.
Does the system support dark-phase feeding restriction protocols?
Yes—the software allows conditional feeding gate actuation triggered by real-time activity thresholds or scheduled Zeitgeber time windows, with millisecond-precision logging of every pellet access event.
