Co-Cultivation Assays for Detecting Infectious Human-Tropic Porcine Endogenous Retroviruses (PERVs).
Level 5 - mechanism / opinion, no new human data
Narrative methodological review of in vitro assays without primary clinical or systematic data
PubMed 40806244 · doi:10.3390/ijms26157111
What was done
Methodological review evaluating three in vitro co-cultivation assay formats designed to detect infectious human-tropic porcine endogenous retroviruses (PERVs): human cells incubated with gamma-irradiated pig cells, double-chamber systems with a porous membrane separating cell types, and co-culture of pig cells with human target cells engineered to express a selection-resistance gene.
What was found
The abstract reports no numerical or quantitative findings. Methodologically, gamma irradiation prevents pig cell replication but risks altering gene expression; double-chamber separation detects only cell-free viral particles and misses cell-to-cell transmission; and resistance-gene-based co-culture enables evaluation of both cell-free and cell-to-cell transmission while permitting selective elimination of donor pig cells, representing the assay that best approximates in vivo xenotransplantation conditions.
Why it matters
Standardizing laboratory assays for PERV transmission is essential for preclinical safety screening and regulatory evaluation of pig-to-human xenotransplantation products.
Limits
This is a narrative review with no primary experimental data, statistical comparisons, or sample size reported in the abstract. In vitro assays test only specific donor-recipient cell combinations, so a negative finding in vitro does not rule out transmission risk across the diverse cell types present in an intact human organ recipient.
Cited by
- supports Porcine endogenous retroviruses (PERVs) are present in the germline genome of all pigs and have been shown to infect and replicate in human cells in vitro.