1
|
Buss N, Lanigan L, Zeller J, Cissell D, Metea M, Adams E, Higgins M, Kim KH, Budzynski E, Yang L, Liu Y, Butt M, Danos O, Fiscella M. Characterization of AAV-mediated dorsal root ganglionopathy. Mol Ther Methods Clin Dev 2022; 24:342-354. [PMID: 35229008 PMCID: PMC8851102 DOI: 10.1016/j.omtm.2022.01.013] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 01/27/2022] [Indexed: 12/12/2022]
Abstract
Recent studies in non-human primates administered recombinant adeno-associated viruses (rAAVs) have shown lesions in the dorsal root ganglia (DRG) of unknown pathogenesis. In this study, rAAV9s manufactured using different purification methods alongside a non-expressing Null AAV9 vector was administered to groups of cynomolgus monkeys followed by neuropathological evaluation after 4 weeks. Lesions, including neuronal degeneration, increased cellularity, and nerve fiber degeneration, were observed in the DRG, regardless of purification methods. Animals did not develop any neurological signs throughout the study, and there was no loss of function observed in neuro-electrophysiological endpoints or clear effects on intraepidermal nerve fiber density. However, magnetic resonance imaging (MRI) of animals with axonopathy showed an increase in short tau inversion recovery (STIR) intensity and decrease in fractional anisotropy. In animals administered the Null AAV9 vector, DRG lesions were not observed despite vector DNA being detected in the DRG at levels equivalent to or greater than rAAV9-treated animals. This study further supports that DRG toxicity is associated with transgene overexpression in DRGs, with particular sensitivity at the lumbar and lumbosacral level. The data from this study also showed that the nerve fiber degeneration did not correlate with any functional effect on nerve conduction but was detectable by MRI.
Collapse
Affiliation(s)
| | | | | | | | - Monica Metea
- Preclinical Electrophysiology Consulting, Mattapoisett, MA 02739, USA
| | | | | | | | | | - Lin Yang
- REGENXBIO, Rockville, MD 20850, USA
| | - Ye Liu
- REGENXBIO, Rockville, MD 20850, USA
| | | | | | | |
Collapse
|
2
|
Norvall A, Cota JG, Pusterla N, Cissell D. Ultrasound-guided arthrocentesis of the temporomandibular joint in healthy adult horses is equivalent to blind arthrocentesis. Vet Radiol Ultrasound 2020; 61:346-352. [PMID: 31896164 DOI: 10.1111/vru.12836] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 08/27/2019] [Accepted: 10/08/2019] [Indexed: 11/30/2022] Open
Abstract
Equine temporomandibular joint (TMJ) diseases are increasingly recognized as a problem for the well-being and performance of horses. Diagnosis is confounded by overlap of clinical signs associated with pathology of the oral cavity, poll, and cervical vertebrae. Arthrocentesis for intra-articular analgesia, sampling of synovial fluid, and medication is needed for diagnostic and therapeutic purposes. Ultrasound features of the normal TMJ and a blind arthrocentesis technique have been described, but a systematic approach to ultrasound-guided (USG) arthrocentesis has not been reported. Ultrasound guidance allows visualization of the TMJ that may prove beneficial in cases when pathology, abnormal anatomy, or clinician inexperience make blind arthrocentesis difficult. We hypothesized that USG arthrocentesis would result in fewer needle repositions than blind arthrocentesis. We also aimed to assess synovial fluid parameters for normal equine TMJs. A prospective randomized method comparison with crossover experimental design compared the number of needle positionings required for accurate injection of the TMJ using each technique. Arthrocentesis technique and operator experience were tested using cadavers and two operators. Injection success was confirmed using CT. The radiologist then applied both techniques in normal live horses. No statistically significant difference was noted between arthrocentesis techniques or operators (P > .05). No complications were observed in live horses following either technique. Synovial fluid parameters were largely within the normal range expected for other synovial joints. Either blind or USG arthrocentesis of the equine TMJ can be performed with minimal prior operator experience. Ultrasound-guided arthrocentesis is an alternative method and can be considered in cases with altered anatomy.
Collapse
Affiliation(s)
- Amy Norvall
- School of Veterinary Medicine, University of California, Davis, Davis, California
| | - Jose Guerrero Cota
- School of Veterinary Medicine, University of California, Davis, Davis, California
| | - Nicola Pusterla
- School of Veterinary Medicine, University of California, Davis, Davis, California
| | - Derek Cissell
- School of Veterinary Medicine, University of California, Davis, Davis, California
| |
Collapse
|
3
|
|