Improving Senescent Wound Healing With Local and Systemic Therapies.

The population is aging, and the prevalence of chronic wounds is increasing. Because neovascularization is essential for tissue repair and both local and systemic factors affect new blood vessel formation, we hypothesize that altering either pathway would reciprocally enhance wound healing in the aged. To test this hypothesis, p53 was locally suppressed and endothelial progenitor cells (EPCs) were systemically mobilized in a murine model of senescent wound healing.Bilateral 6-mm full-thickness stented wounds were made on the dorsum of Zmpste24 mice. Animals received weekly topical p53 small interfering RNA (siRNA) (n = 25), weekly topical nonsense siRNA (n = 25), daily subcutaneous AMD3100 injections (n = 25), or daily subcutaneous saline injections (n = 25). Wounds were photographically assessed and harvested for reverse transcription polymerase chain reaction, enzyme-linked immunosorbent assay, and immunostaining over 40 days. Circulating EPC levels were measured using fluorescence-activated cell sorting analysis.Local p53 siRNA significantly improved Zmpste24 wound healing (18 ± 2 vs 40 ± 3 days; P ≤ 0.0001). p53 siRNA significantly increased local provasculogenic factors (hypoxia-inducible factor 1 α, stromal cell-derived factor 1 α, and vascular endothelial growth factor; P ≤ 0.05) and decreased local proapoptotic factors (p53, PUMA, and Bax; P ≤ 0.05). Local p53 siRNA also significantly increased the number of circulating EPCs (8 ± 0.2% vs 2.6 ± 0.1%; P ≤ 0.0001). AMD3100 treatment also significantly improved wound healing (20 ± 2 vs 40 ± 3 days; P ≤ 0.0001) and increased EPCs mobilization (7.8 ± 0.4% vs 2.6 ± 0.1%; P ≤ 0.0001). In addition, systemic AMD3100 increased local provasculogenic factors (hypoxia-inducible factor 1 α, stromal cell-derived factor 1 α, and vascular endothelial growth factor; P ≤ 0.05) and decreased local proapoptotic factors (p53, PUMA, and Bax; P ≤ 0.05). Both treatments significantly increased the number of blood vessels in the wound bed (P ≤ 0.0001).The marked delay in Zmpste24 wound healing is significantly improved by local (p53 siRNA) and systemic (AMD3100) treatments. The resulting decrease in proapoptotic factors and increase in provasculogenic factors in the wound bed as well as the increased level of circulating EPCs appear to reverse age-related wound healing impairment by enhancing wound neovascularization.

The Effect of Processing Technique on Fat Graft Survival.

BACKGROUND: Wide variations in fat graft survival have been reported. The authors hypothesize that treating the adipose tissue on Telfa gauze creates a processed lipoaspirate with a more functional adipokine profile that improves fat graft survival. METHODS: Suction-assisted lipoaspirate was harvested from humans and was either processed by centrifugation, rolled on Telfa gauze, or left unprocessed. Progenitor cell populations were quantified and characterized by flow cytometry. Glycerol-3-phosphate dehydrogenase assay was used to measure the functional adipocytes. The lipoaspirates were grafted into (n = 45) wild-type mice and harvested to assess fat graft persistence. Vascular endothelial growth factor and platelet-derived growth factor-BB secretions were measured by enzyme-linked immunosorbent assay technique. RESULTS: Centrifuged lipoaspirate had a greater number of progenitor cells per gram of tissue than Telfa-processed and unprocessed lipoaspirate. However, Telfa-processed lipoaspirate had a greater number of functional adipocytes (0.104 U/ml) than centrifuged (0.080 U/ml) and unprocessed lipoaspirate (0.083 U/ml) on glycerol-3-phosphate dehydrogenase assay (p < 0.05). After 10 weeks of grafting, it had greater fat graft persistence (70.9 ± 6.2 percent) than centrifuged (56.7 ± 5.5 percent) and unprocessed lipoaspirate (42.2 ± 2.7 percent) (p < 0.05). It also maintained a greater secretion of vascular endothelial growth factor and platelet-derived growth factor-BB at weeks 1 and 2 than centrifuged and unprocessed lipoaspirate. Furthermore, CD31 staining demonstrated an increase in vascular density of the Telfa-processed lipoaspirate at week 2 compared with the centrifuged lipoaspirate (37 ± 1 percent and 14 ± 4 percent per high-power field; p < 0.05). CONCLUSIONS: Lipoaspirate processing technique has a significant impact on fat graft survival rate. Increasing the number of functional adipocytes by processing the fat on Telfa gauze may augment the secretion of angiogenic and mitogenic adipokines within the graft, thereby improving its survivability. CLINICAL QUESTION/LEVEL OF EVIDENCE: Therapeutic, V.

Five-Year Follow-Up of Midface Distraction in Growing Children with Syndromic Craniosynostosis.

BACKGROUND: Maxillary position in patients with syndromic craniosynostosis after midface distraction has been shown to be stable 1 year postoperatively. The purpose of this study is to assess midfacial position in the growing child with craniosynostosis 5 years after Le Fort III advancement with a rigid external device. METHODS: Seventeen consecutive patients were identified to have the diagnosis of syndromic craniosynostosis and had undergone midface advancement [corrected]. There were 10 boys and seven girls, seven patients had Crouzon syndrome, five had Apert syndrome, and five had Pfeiffer syndrome. A standard subcranial Le Fort III osteotomy was performed. Cephalometric analysis was performed to assess the position of the maxilla. RESULTS: After device removal, orbitale advanced 13.67 mm along the x axis and downward 1.70 mm along the y axis. The A point advanced 15.97 mm along the x axis and downward 1.14 mm along the y axis. At 1 year after distraction, both orbitale and A point had advanced an additional 0.47 mm and 0.24 mm along the x axis and downward 0.58 mm and 1.78 mm along the y axis, respectively. At 5 years after distraction, the orbitale moved posterior 0.58 mm and the A point advanced an additional 2.08 mm along the x axis. Orbitale and A point descended 3.23 mm and 5.2 mm along the y axis, respectively. CONCLUSION: After Le Fort III advancement with distraction, the maxillary position remains stable and continues to advance minimally along the x axis and demonstrates more growth along the y axis over the long term. CLINICAL QUESTION/LEVEL OF EVIDENCE: Therapeutic, IV.

Design and validation of a dynamic cell-culture system for bone biology research and exogenous tissue-engineering applications.

Bone lacunocanalicular fluid flow ensures chemotransportation and provides a mechanical stimulus to cells. Traditional static cell-culture methods are ill-suited to study the intricacies of bone biology because they ignore the three-dimensionality of meaningful cellular networks and the lacunocanalicular system; furthermore, reliance on diffusion alone for nutrient supply and waste product removal effectively limits scaffolds to 2-3 mm thickness. In this project, a flow-perfusion system was custom-designed to overcome these limitations: eight adaptable chambers housed cylindrical cell-seeded scaffolds measuring 12 or 24 mm in diameter and 1-10 mm in thickness. The porous scaffolds were manufactured using a three-dimensional (3D) periodic microprinting process and were composed of hydroxyapatite/tricalcium phosphate with variable thicknesses, strut sizes, pore sizes and structural configurations. A multi-channel peristaltic pump drew medium from parallel reservoirs and perfused it through each scaffold at a programmable rate. Hermetically sealed valves permitted sampling or replacement of medium. A gas-permeable membrane allowed for gas exchange. Tubing was selected to withstand continuous perfusion for > 2 months without leakage. Computational modelling was performed to assess the adequacy of oxygen supply and the range of fluid shear stress in the bioreactor-scaffold system, using 12 × 6 mm scaffolds, and these models suggested scaffold design modifications that improved oxygen delivery while enhancing physiological shear stress. This system may prove useful in studying complex 3D bone biology and in developing strategies for engineering thick 3D bone constructs. Copyright © 2013 John Wiley & Sons, Ltd.

Basal View Reference Photographs for Nasolabial Appearance Rating in Unilateral Cleft Lip and Palate.

The Asher-McDade system is a 5-point ordinal scale frequently used to rate the components of nasolabial appearance, including nasal form and nasal symmetry, in unilateral cleft lip and palate. Although reference photographs illustrating this scale have been identified for the frontal and right profile view, no reference photographs exist for the basal view. The aim of this study was to identify reference photographs for nasal form and nasal symmetry from the basal view to illustrate this scale and facilitate its use. Four raters assessed nasolabial appearance (form and symmetry) on basal view photographs of 50 children (average age 8 years) with a repaired cleft lip. Intraclass correlation coefficients show fair to moderate inter-rater reliability. Cronbach α indicated strong agreement between raters (0.77 nasal form; 0.78 nasal symmetry; 0.80 overall), along with low duplicate measurement error and strong internal consistency between the measures. The photographs with the highest agreement among raters were selected to illustrate each point on the 5-point scale for nasal form and for nasal symmetry, resulting in the selection of 10 reference photographs. The basal view reference photograph set developed from this study may complement existing reference photograph sets for other views and facilitate rating tasks.

Comparative Study of Early Secondary Nasal Revisions and Costs in Patients With Clefts Treated With and Without Nasoalveolar Molding.

The present study aims to determine the risk of early secondary nasal revisions in patients with complete unilateral and bilateral cleft lip and palate (U/BCLP) treated with and without nasoalveolar molding (NAM) and examine the associated costs of care. A retrospective cohort study from 1990 to 1999 was performed comparing the risk of early secondary nasal revision surgery in patients with a CLP treated with NAM and surgery (cleft lip repair and primary surgical nasal reconstruction) versus surgery alone in a private practice and tertiary level clinic. The NAM treatment group consisted of 172 patients with UCLP and 71 patients with BCLP, whereas the non-NAM-prepared group consisted of 28 patients with UCLP and 5 with BCLP. The risk of secondary nasal revision for patients with UCLP was 3% in the NAM group and 21% in the non-NAM group. The risk of secondary nasal revision for patients with BCLP was 7% in the NAM group compared with 40% in the non-NAM group. Using multicenter averages, the non-NAM revision rates were calculated at 37.8% and 48.5% for U/BCLP, respectively. Applying these risks of revision, NAM treatment led to an estimated savings of between $491 and $4893 depending on the type of cleft. In conclusion, NAM can reduce the number of early secondary nasal revision surgeries and, therefore, reduce the overall cost of care.

Unilateral Craniofacial Microsomia: Unrecognized Cause of Pediatric Obstructive Sleep Apnea.

Bilateral craniofacial microsomia causes obstructive sleep apnea (OSA). We hypothesize that unilateral craniofacial microsomia (UCFM) is an underappreciated cause of OSA. The records of all pediatric UCFM patients from 1990 to 2010 were reviewed; only complete records were included in the study. UCFM patients with OSA (apnea hypopnea index >1/hr) were compared to UCFM patients without OSA. Univariate and multivariate Fisher and χ(2) tests were performed. Of the 62 UCFM patients, 7 (11.3%) had OSA. All OSA patients had Pruzansky IIB or III mandibles. OSA patients presented with snoring (71.4%), failure to thrive (FTT) (57.1%), and chronic respiratory infections (42.8%). Snoring (P < 0.001), Goldenhar syndrome (P = 0.001), and FTT (P = 0.004) were significantly associated with OSA, but race, obesity, clefts, respiratory anomalies, adenotonsillar hypertrophy, and laterality were not. The prevalence of OSA in UCFM patients is up to 10 times greater than in the general population. Snoring, Goldenhar syndrome, and FTT are significantly associated with the presence of OSA.

Acellular dermal matrix-based gene therapy augments graft incorporation.

BACKGROUND: Acellular dermal matrix (ADM) is widely used for structural or dermal replacement purposes. Given its innate biocompatibility and its potential to vascularize, we explored the possibility of ADM to function as a small interfering RNA (siRNA) delivery system. Specifically, we sought to improve ADM vascularization by siRNA-mediated inhibition of prolyl hydroxylase domain-2 (PHD2), a cytoplasmic protein that regulates hypoxia inducible factor-1α, and improve neovascularization. MATERIALS AND METHODS: Fluorescently labeled siRNA was used to rehydrate thin implantable ADM. Pharmacokinetic release of siRNA was determined. Twelve millimeter sections of ADM reconstituted with PHD2 siRNA (nonsense siRNA as control) and applied to dorsal wounds of 40 FVB mice. Grafts were sewn in, bolstered, and covered with occlusive dressings. Photographs were taken at 0, 7, and 14 d. Wounds were harvested at 7 and 14 d and analyzed (messenger RNA, protein, histology, and immunohistochemistry). RESULTS: Release kinetics was first-order with 80% release by 12 h. By day 14, PHD2-containing ADM appeared viable and adherent, whereas controls appeared nonviable and nonadherent. Real-time reverse transcription-polymerase chain reaction demonstrated near-complete knockdown of PHD2, whereas vascular endothelial growth factor and FGF-2 were increased 2.3- and 4.7-fold. On enzyme-linked immunosorbent assay, vascular endothelial growth factor was increased more than fourfold and stromal cell-derived factor doubled. Histology demonstrated improved graft incorporation in treated groups. Immunohistochemical demonstrated increased vascularity measured by CD31 staining and increased new cell proliferation by denser proliferating cell nuclear antigen staining in treated versus controls. CONCLUSIONS: We concluded that ADM is an effective matrix for local delivery of siRNA. Strategies to improve the matrix and/or genetically alter the local tissue environment can be envisioned.

A unified framework for automatic wound segmentation and analysis with deep convolutional neural networks.

Wound surface area changes over multiple weeks are highly predictive of the wound healing process. Furthermore, the quality and quantity of the tissue in the wound bed also offer important prognostic information. Unfortunately, accurate measurements of wound surface area changes are out of reach in the busy wound practice setting. Currently, clinicians estimate wound size by estimating wound width and length using a scalpel after wound treatment, which is highly inaccurate. To address this problem, we propose an integrated system to automatically segment wound regions and analyze wound conditions in wound images. Different from previous segmentation techniques which rely on handcrafted features or unsupervised approaches, our proposed deep learning method jointly learns task-relevant visual features and performs wound segmentation. Moreover, learned features are applied to further analysis of wounds in two ways: infection detection and healing progress prediction. To the best of our knowledge, this is the first attempt to automate long-term predictions of general wound healing progress. Our method is computationally efficient and takes less than 5 seconds per wound image (480 by 640 pixels) on a typical laptop computer. Our evaluations on a large-scale wound database demonstrate the effectiveness and reliability of the proposed system.

Assessment of presurgical clefts and predicted surgical outcome in patients treated with and without nasoalveolar molding.

Obtaining an esthetic and functional primary surgical repair in patients with complete cleft lip and palate (CLP) can be challenging because of tissue deficiencies and alveolar ridge displacement. This study aimed to describe surgeons' assessments of presurgical deformity and predicted surgical outcomes in patients with complete unilateral and bilateral CLP (UCLP and BCLP, respectively) treated with and without nasoalveolar molding (NAM). Cleft surgeon members of the American Cleft Palate-Craniofacial Association completed online surveys to evaluate 20 presurgical photograph sets (frontal and basal views) of patients with UCLP (n = 10) and BCLP (n = 10) for severity of cleft deformity, quality of predicted surgical outcome, and likelihood of early surgical revision. Five patients in each group (UCLP and BCLP) received NAM, and 5 patients did not receive NAM. Surgeons were masked to patient group. Twenty-four percent (176/731) of surgeons with valid e-mail addresses responded to the survey. For patients with UCLP, surgeons reported that, for NAM-prepared patients, 53.3% had minimum severity clefts, 58.9% were anticipated to be among their best surgical outcomes, and 82.9% were unlikely to need revision surgery. For patients with BCLP, these percentages were 29.8%, 38.6%, and 59.9%, respectively. Comparing NAM-prepared with non-NAM-prepared patients showed statistically significant differences (P < 0.001), favoring NAM-prepared patients. This study suggests that cleft surgeons assess NAM-prepared patients as more likely to have less severe clefts, to be among the best of their surgical outcomes, and to be less likely to need revision surgery when compared with patients not prepared with NAM.

Endogenous cell therapy improves bone healing.

BACKGROUND: Although bone repair is often a relatively rapid and efficient process, many bone defects do not heal. Because an adequate blood supply is essential for new bone formation, we hypothesized that augmenting new blood vessel formation by increasing the number of circulating vasculogenic progenitor cells (PCs) with AMD3100 and enhancing their trafficking to the site of injury with recombinant human parathyroid hormone (rhPTH) will improve healing. METHODS: Critical-sized 3-mm cranial defects were trephined into the right parietal bone of C57BLKS/J 6 mice (N = 120). The mice were divided into 4 equal groups (n = 30 for each). The first group received daily subcutaneous injections of AMD3100 (5 mg/kg). The second group received daily subcutaneous injections of rhPTH (5 mg/kg). The third group received both AMD3100 and rhPTH. The fourth group received subcutaneous injections of saline. Circulating vasculogenic PC numbers, new blood vessel formation, and bony regeneration were assessed. Progenitor cell adhesion, migration, and tubule formation were assessed in the presence of rhPTH and AMD3100. RESULTS: Flow cytometry demonstrated that combination therapy significantly increased the number of circulating PCs compared with all other groups. In vitro, AMD3100-treated PCs had significantly increased adhesion migration, and tubule formation was assessed in the presence of rhPTH. Combination therapy significantly improved new blood vessel formation in those with cranial defect compared with all other groups. Finally, bony regeneration was significantly increased in the combination therapy group compared with all other groups. CONCLUSIONS: The combination of a PC-mobilizing and traffic-enhancing agent improved bony regeneration of calvarial defects in mice.

Combination therapy accelerates diabetic wound closure.

BACKGROUND: Non-healing foot ulcers are the most common cause of non-traumatic amputation and hospitalization amongst diabetics in the developed world. Impaired wound neovascularization perpetuates a cycle of dysfunctional tissue repair and regeneration. Evidence implicates defective mobilization of marrow-derived progenitor cells (PCs) as a fundamental cause of impaired diabetic neovascularization. Currently, there are no FDA-approved therapies to address this defect. Here we report an endogenous PC strategy to improve diabetic wound neovascularization and closure through a combination therapy of AMD3100, which mobilizes marrow-derived PCs by competitively binding to the cell surface CXCR4 receptor, and PDGF-BB, which is a protein known to enhance cell growth, progenitor cell migration and angiogenesis. METHODS AND RESULTS: Wounded mice were assigned to 1 of 5 experimental arms (n = 8/arm): saline treated wild-type, saline treated diabetic, AMD3100 treated diabetic, PDGF-BB treated diabetic, and AMD3100/PDGF-BB treated diabetic. Circulating PC number and wound vascularity were analyzed for each group (n = 8/group). Cellular function was assessed in the presence of AMD3100. Using a validated preclinical model of type II diabetic wound healing, we show that AMD3100 therapy (10 mg/kg; i.p. daily) alone can rescue diabetes-specific defects in PC mobilization, but cannot restore normal wound neovascularization. Through further investigation, we demonstrate an acquired trafficking-defect within AMD3100-treated diabetic PCs that can be rescued by PDGF-BB (2 µg; topical) supplementation within the wound environment. Finally, we determine that combination therapy restores diabetic wound neovascularization and accelerates time to wound closure by 40%. CONCLUSIONS: Combination AMD3100 and PDGF-BB therapy synergistically improves BM PC mobilization and trafficking, resulting in significantly improved diabetic wound closure and neovascularization. The success of this endogenous, cell-based strategy to improve diabetic wound healing using FDA-approved therapies is inherently translatable.

Unilateral cleft lip repair.

Modern cleft surgery requires four-dimensional and functional anatomic understanding of the cleft (and noncleft) lip, nose, and alveolus. Some techniques for nasolabial repair rely more on precise anatomic geometry, whereas others afford the surgeon a more flexible design. Consistent anthropometry enables accurate assessment and reporting of long-term outcomes; such reports are needed to guide perioperative care, delineate optimal repair principles, and resolve ongoing controversies.

Disparities in initial presentation and treatment outcomes of diabetic foot ulcers in a public, private, and Veterans Administration hospital.

BACKGROUND: Disparities in diabetic foot ulcer (DFU) treatment outcomes are well described, although few studies identify risk factors contributing to disparate healing and amputation rates. In a unique academic center serving urban public, private, and veteran patients, we investigated amputation and healing rates and specific risk factors for disparate treatment outcomes. METHODS: A retrospective chart review of diabetic patients with a new diagnosis of a foot ulcer at geographically adjacent, but independent public, private, and Veterans Administration (VA) hospitals was conducted. Healing and lower extremity amputation outcomes were assessed. RESULTS: Across the three hospitals, 234 patients met the inclusion criteria. Patients at the VA hospital were older (mean 72.5 years; P < 0.001) and had gangrenous ulcers (mean 14.1%; P < 0.001) compared with patients in the private and public hospitals. Public hospital patients were mostly Hispanic (mean 54%; P < 0.001) with a shorter duration of diabetes (mean 12.8 years; P = 0.02), but were more poorly controlled than VA and private hospital patients (P ≤ 0.001). Prior amputation (odds ratio [OR] 1.97; P = 0.016) and non-Caucasian race (OR 2.42; P = 0.004) increased the risk of amputation on multivariate analysis. Osteomyelitis (P = 0.0371) and gangrene (P < 0.001) are independent risk factors for amputation. Across all three hospitals, 42.3% of patients were treated by amputation (6.8% private, 12% public and 23.5% VA; P < 0.001). CONCLUSION: In a single triumvirate health care system where the patient population is stratified primarily by insurance, VA patients have significantly higher amputation rates compared with patients at adjacent private and public hospitals. The VA patients are largely racial minorities with advanced DFU progression to gangrenous ulcers.

Maxillary mucocele with proptosis and visual impairment: a late complication of Le Fort III distraction.

Maxillary mucoceles are a relatively rare entity especially following surgical procedures involving osteotomies of the maxilla. The etiology of maxillary mucoceles has been ascribed to facial trauma (fractures), sinus surgery, and chronic inflammatory diseases or infections. Mucoceles can follow injury to the sinus mucosa and/or sinus outflow tract with a resulting expansile cystic mass. The clinical presentation ranges from swelling, pain, a palpable mass, proptosis, enophthalmos, and diplopia. The treatment involves either open or endoscopic incision and drainage of the cyst, mucosal resection, and an antrostomy for drainage.We report the case of a patient with Pfeiffer syndrome who underwent Le Fort III distraction osteogenesis and developed a symptomatic mucocele 15 years postoperatively.

Lacunocanalicular fluid flow transduces mechanical tension stress during distraction osteogenesis.

The mechanotransduction mechanisms linking distraction device activation to new bone formation remain unknown. We hypothesize that the tension stress of activation during distraction osteogenesis is transmitted through lacunocanalicular fluid flow to initiate the osteogenic signaling cascade. Adult Sprague-Dawley rats (N = 24) were subjected to mandibular osteotomy and application of an external distraction device. After a 3-day latency period, half the animals (n = 12) underwent device activation at 0.25 mm twice daily for 6 days (total activation, 3 mm), and the other half (n = 12) had no activation. On day 10, the animals were injected with fluorescent reactive red lacunocanalicular tracer before killing. Mandibles were harvested, embedded, and sectioned, and reactive red epifluorescence lacunocanalicular flow was measured. Protein was harvested for focal adhesion kinase 1 (FAK1), NESPRIN1, SUN1, LAMIN A/C, and SMAD1 Western blotting as well as for bone morphogenetic protein (BMP)-2 enzyme-linked immunosorbent assay and alkaline phosphatase assay. Lacunocanalicular fluid flow was significantly greater in the distracted samples (60.5 ± 14 vs 10.3 ± 4 molecules of equivalent soluble fluorochrome per megapixel, P = 0.01). Flow distribution demonstrated the highest lacunocanalicular flow near the center of the distraction gap. Increased lacunocanalicular flow resulted in increased FAK1 (P = 0.009), NESPRIN1 (P = 0.01), SUN1 (P = 0.01), and LAMIN A/C (P = 0.008) expression. Focal adhesion kinase 1 activation in the presence of BMP-2 protein expression (P = 0.001) resulted in increased intranuclear SMAD1 phosphorylation (P = 0.04) and alkaline phosphatase activity (P < 0.0001). These findings suggest that activation of the distraction osteogenesis device affects cellular response through changes in lacunocanalicular fluid flow.

Quality-control culture system restores diabetic endothelial progenitor cell vasculogenesis and accelerates wound closure.

Delayed diabetic wound healing is, in part, the result of inadequate endothelial progenitor cell (EPC) proliferation, mobilization, and trafficking. Recently, we developed a serum-free functional culture system called the quality and quantity culture (QQc) system that enhances the number and vasculogenic potential of EPCs. We hypothesize that QQc restoration of diabetic EPC function will improve wound closure. To test this hypothesis, we measured diabetic c-kit(+)Sca-1(+)lin(-) (KSL) cell activity in vitro as well as the effect of KSL cell-adoptive transfer on the rate of euglycemic wound closure before and after QQc. KSL cells were magnetically sorted from control and streptozotocin-induced type I diabetic C57BL6J bone marrow. Freshly isolated control and diabetic KSL cells were cultured in QQc for 7 days and pre-QQc and post-QQc KSL function testing. The number of KSL cells significantly increased after QQc for both diabetic subjects and controls, and diabetic KSL increased vasculogenic potential above the fresh control KSL level. Similarly, fresh diabetic cells form fewer tubules, but QQc increases diabetic tubule formation to levels greater than that of fresh control cells (P < 0.05). Adoptive transfer of post-QQc diabetic KSL cells significantly enhances wound closure compared with fresh diabetic KSL cells and equaled wound closure of post-QQc control KSL cells. Post-QQc diabetic KSL enhancement of wound closure is mediated, in part, via a vasculogenic mechanism. This study demonstrates that QQc can reverse diabetic EPC dysfunction and achieve control levels of EPC function. Finally, post-QQc diabetic EPC therapy effectively improved euglycemic wound closure and may improve diabetic wound healing.

Characterization of adipose-derived mesenchymal stem cell combinations for vascularized bone engineering.

Since bone repair and regeneration depend on vasculogenesis and osteogenesis, both of these processes are essential for successful vascularized bone engineering. Using adipose-derived stem cells (ASCs), we investigated temporal gene expression profiles, as well as bone nodule and endothelial tubule formation capacities, during osteogenic and vasculogenic ASC lineage commitment. Osteoprogenitor-enriched cell populations were found to express RUNX2, MSX2, SP7 (osterix), BGLAP (osteocalcin), SPARC (osteonectin), and SPP1 (osteopontin) in a temporally specific sequence. Irreversible commitment of ASCs to the osteogenic lineage occurred between days 6 and 9 of differentiation. Endothelioprogenitor-enriched cell populations expressed CD34, PECAM1 (CD31), ENG (CD105), FLT1 (Vascular endothelial growth factor [VEGFR1]), and KDR (VEGFR2). Capacity for microtubule formation was evident in as early as 3 days. Functional capacity was assessed in eight coculture combinations for both bone nodule and endothelial tubule formation, and the greatest expression of these end-differentiation phenotypes was observed in the combination of well-differentiated endothelial cells with less-differentiated osteoblastic cells. Taken together, our results demonstrate vascularized bone engineering utilizing ASCs is a promising enterprise, and that coculture strategies should focus on developing a more mature vascular network in combination with a less mature osteoblastic stromal cell.

Incidence of oronasal fistula formation after nasoalveolar molding and primary cleft repair.

The incidence of postoperative complications in cleft care is low. In this 19-year retrospective analysis of cleft lip and palate patients treated with preoperative nasoalveolar molding, we examine the incidence of postoperative oronasal fistulae. The charts of 178 patients who underwent preoperative nasoalveolar molding by the same orthodontist/prosthodontist team and primary cleft lip/palate repair by the same surgeon over a 19-year period were reviewed. Millard, Mohler, Cutting, or Mulliken-type techniques were used for cleft lip repairs. Oxford-, Bardach-, or von Langenbeck-type techniques were used for cleft palate repairs. One nasolabial fistula occurred after primary cleft lip repair (0.56% incidence) and was repaired surgically. Four palatal fistulae (3 at the junction between soft and hard palate and 1 at the right anterior palate near the incisive foramen) occurred, but 3 healed spontaneously. Only 1 palatal fistula (0.71%) required surgical repair. All 5 fistulae occurred within the first 8 years of the study period, with 4 (80%) of 5 occurring within the first 3 years. Although fistula rate may be related to surgeon experience and the evolution of presurgical techniques, nasoalveolar molding in conjunction with nasal floor closure contributes to a low incidence of oronasal fistulae.