Related Experiment Video
Updated: Jun 17, 2026
Procurement of Parathyroid Glands from Living Donor Pigs and Ex Vivo Identification
Published on: August 1, 2025
Quality monitoring of microbial contamination of cryopreserved parathyroid tissue
Brie A Stotler1, Ronit Reich-Slotky, Joseph Schwartz
1Department of Pathology, New York-Presbyterian Hospital, Columbia University Medical Center, 622 West 168th Street, Harkness 4-414, New York, NY 10032, USA. bs2277@columbia.edu
Abstract:
Cryopreservation of parathyroid tissue (PT) provides patients undergoing parathyroidectomy with an option for delayed autologous heterotopic parathyroid transplantation. A standard protocol for quality monitoring of PT has not been established. This article describes a method for detecting the presence of bacterial contamination in PT tissue intended for autologous transplantation. PT was received in the tissue bank, processed under aseptic conditions, and placed into cryopreservation medium. Sterility testing was performed at 2 time points prior to cryopreservation. From January 2005 to October 2008, 47 PT samples were cryopreserved. The following bacteria were isolated from 11 PT specimens: Staphylococcus epidermidis, Staphylococcus capitis subspecies ureolyticus, Staphylococcus lugdunensis, Bacillus pumilus, and corynebacteria (diphtheroids). 23% of PTs were contaminated at the time of collection, predominantly with indigenous bacteria. Quality monitoring using this protocol is a useful tool to identify tissues contaminated with bacteria.
Insights
Bacterial contamination in parathyroid tissue (PT) can impact transplantation success. This study developed a sterility testing protocol to identify contaminated PT samples before cryopreservation, ensuring safer tissue for patients.
Area of Science:
- Transplantation immunology
- Microbiology
- Tissue banking
Background:
- Cryopreservation of parathyroid tissue (PT) enables delayed autologous transplantation after parathyroidectomy.
- Standardized quality monitoring protocols for PT are lacking.
- Bacterial contamination poses a risk to the success of autologous parathyroid transplantation.
Purpose of the Study:
- To describe a method for detecting bacterial contamination in parathyroid tissue intended for autologous transplantation.
- To establish a quality monitoring protocol for cryopreserved parathyroid tissue.
Main Methods:
- Parathyroid tissue samples were processed under aseptic conditions and placed into cryopreservation medium.
- Sterility testing was performed at two time points prior to cryopreservation.
- Bacterial identification was conducted on positive samples.
Main Results:
- From January 2005 to October 2008, 47 PT samples were cryopreserved.
- Eleven PT specimens (23%) showed bacterial contamination.
- Isolated bacteria included Staphylococcus epidermidis, Staphylococcus capitis subspecies ureolyticus, Staphylococcus lugdunensis, Bacillus pumilus, and corynebacteria (diphtheroids), predominantly indigenous flora.
Conclusions:
- The developed protocol is effective in identifying bacterial contamination in parathyroid tissue.
- Quality monitoring is crucial for ensuring the safety of parathyroid tissue for autologous transplantation.
- This method helps mitigate risks associated with transplanting contaminated tissue.
