Delivering the human β-defensin-3 gene to the cervix of pregnant mice significantly reduced bacterial ascent into the uterus and increased live births.
More live pupsHBD3 gene therapy in pregnant mice significantly increased live births after ascending bacterial infection
What the researchers found
Cervical gene delivery of HBD3 significantly reduced uterine bacterial bioluminescence and increased the number of live-born pups compared to controls in an ascending infection model.
Why it matters
Preterm birth from ascending infection is a major cause of neonatal mortality. Augmenting the cervix's natural antimicrobial peptide defenses could prevent infections without antibiotics.
The numbers in context
40% of preterm births infection-related; significant reduction in uterine bacteria at 24h; significant increase in live pups
How the study worked
AAV8 vector with HBD3 gene administered intravaginally to pregnant mice at E13.5, E. coli K1 infection induced at E16.5, bioluminescence imaging for bacterial tracking.
Who was studied
Pregnant mice (E. coli ascending infection model)
What this study cannot tell us
Mouse model may not translate to human pregnancy. Single bacterial species tested. Long-term safety of viral vector delivery during pregnancy unknown.
How to read the evidence
Animal study providing proof-of-concept. Promising results but far from clinical application.
When this study was published
Published in 2020. Gene therapy approaches for antimicrobial peptide delivery continue to be explored.
The bigger picture
This proof-of-concept demonstrates that boosting natural antimicrobial peptide production at the cervical barrier could prevent infection-related preterm birth, a leading cause of neonatal death worldwide.
Questions still open
- Could this approach work in humans with high-risk pregnancies?
- Would non-viral delivery methods be safer for pregnant women?
- Does HBD3 gene therapy affect the normal vaginal microbiome?
Common questions
How could antimicrobial peptides prevent preterm birth?
Is this ready for use in humans?
Read the original research
Cervical Gene Delivery of the Antimicrobial Peptide, Human β-Defensin (HBD)-3, in a Mouse Model of Ascending Infection-Related Preterm Birth.
Frontiers in immunology, 11, 106
Citation
Suff, Natalie; Karda, Rajvinder; Diaz, Juan Antinao; Ng, Joanne; Baruteau, Julien; Perocheau, Dany; Taylor, Peter W; Alber, Dagmar; Buckley, Suzanne M K; Bajaj-Elliott, Mona; Waddington, Simon N; Peebles, Donald. (2020). Cervical Gene Delivery of the Antimicrobial Peptide, Human β-Defensin (HBD)-3, in a Mouse Model of Ascending Infection-Related Preterm Birth.. Frontiers in immunology, 11, 106. https://doi.org/10.3389/fimmu.2020.00106