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Papanna R, Mann LK, Snowise S, Morales Y, Prabhu SP, Tseng SCG, Grill R, Fletcher S, Moise KJ. Neurological Outcomes after Human Umbilical Cord Patch for In Utero Spina Bifida Repair in a Sheep Model. AJP Rep 2016; 6:e309-17. [PMID: 27621952 PMCID: PMC5017885 DOI: 10.1055/s-0036-1592316] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
OBJECTIVES The objective of our study was to test the hypothesis that in utero repair of surgically created spina bifida in a sheep model using cryopreserved human umbilical cord (HUC) patch improves neurological outcome. METHODS Spina bifida with myelotomy was surgically created in timed pregnant ewes at gestational day (GD) 75. The fetuses were randomly assigned to unrepaired versus HUC and treated at GD 95 and then delivered at GD 140. Neurological evaluation was performed using the Texas Spinal Cord Injury Scale (TSCIS), bladder control using ultrasound, and the hindbrain herniation. RESULTS Three lambs without the spina bifida creation served as controls. There were four lambs with spina bifida: two were unrepaired and two underwent HUC repair. The control lambs had normal function. Both unrepaired lambs had nonhealed skin lesions with leakage of cerebrospinal fluid, a 0/20 TSCIS score, no bladder control, and the hindbrain herniation. In contrast, both HUC lambs had a completely healed skin defect and survived to day 2 of life, a 3/20 and 4/20 TSCIS score (nociception), partial bladder control, and normal hindbrain anatomy. CONCLUSIONS Cryopreserved HUC patch appears to improve survival and neurological outcome in this severe form of the ovine model of spina bifida.
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Affiliation(s)
- Ramesha Papanna
- Division of Maternal-Fetal Medicine, Department of Obstetrics, Gynecology and Reproductive Medicine, UTHealth, The University of Texas Health Science at Houston, McGovern Medical School and the Fetal Center at Children's Memorial Hermann Hospital, Houston, Texas
| | - Lovepreet K Mann
- Division of Maternal-Fetal Medicine, Department of Obstetrics, Gynecology and Reproductive Medicine, UTHealth, The University of Texas Health Science at Houston, McGovern Medical School and the Fetal Center at Children's Memorial Hermann Hospital, Houston, Texas
| | - Saul Snowise
- Division of Maternal-Fetal Medicine, Department of Obstetrics, Gynecology and Reproductive Medicine, UTHealth, The University of Texas Health Science at Houston, McGovern Medical School and the Fetal Center at Children's Memorial Hermann Hospital, Houston, Texas
| | - Yisel Morales
- Division of Maternal-Fetal Medicine, Department of Obstetrics, Gynecology and Reproductive Medicine, UTHealth, The University of Texas Health Science at Houston, McGovern Medical School and the Fetal Center at Children's Memorial Hermann Hospital, Houston, Texas
| | - Sanjay P Prabhu
- Department of Radiology, Harvard Medical School, Boston Children's Hospital, Boston, Massachusetts
| | - Scheffer C G Tseng
- The Ocular Surface Center, Miami, Florida; TissueTech, Inc., Miami, Florida
| | - Raymond Grill
- Department of Neurobiology and Anatomical Sciences, University of Mississippi Medical Center, Jackson, Mississippi
| | - Stephen Fletcher
- Division of Pediatric Neurosurgery, The Department of Pediatrics, UTHealth, The University of Texas Health Science at Houston, McGovern Medical School, Houston, Texas; Department of Pediatric Surgery, UTHealth, The University of Texas Health Science at Houston, McGovern Medical School, Houston, Texas
| | - Kenneth J Moise
- Division of Maternal-Fetal Medicine, Department of Obstetrics, Gynecology and Reproductive Medicine, UTHealth, The University of Texas Health Science at Houston, McGovern Medical School and the Fetal Center at Children's Memorial Hermann Hospital, Houston, Texas
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Thyroid hormone triggers the developmental loss of axonal regenerative capacity via thyroid hormone receptor α1 and krüppel-like factor 9 in Purkinje cells. Proc Natl Acad Sci U S A 2012; 109:14206-11. [PMID: 22891348 DOI: 10.1073/pnas.1119853109] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Neurons in the CNS of higher vertebrates lose their ability to regenerate their axons at a stage of development that coincides with peak circulating thyroid hormone (T(3)) levels. Here, we examined whether this peak in T(3) is involved in the loss of axonal regenerative capacity in Purkinje cells (PCs). This event occurs at the end of the first postnatal week in mice. Using organotypic culture, we found that the loss of axon regenerative capacity was triggered prematurely by early exposure of mouse PCs to T(3), whereas it was delayed in the absence of T(3). Analysis of mutant mice showed that this effect was mainly mediated by the T(3) receptor α1. Using gain- and loss-of-function approaches, we also showed that Krüppel-like factor 9 was a key mediator of this effect of T(3). These results indicate that the sudden physiological increase in T(3) during development is involved in the onset of the loss of axon regenerative capacity in PCs. This loss of regenerative capacity might be part of the general program triggered by T(3) throughout the body, which adapts the animal to its postnatal environment.
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