Publications by authors named "David Shifrin"

Background: Gluteal implants are gaining popularity as an alternative to fat grafting for gluteal augmentation. This study aims to compare complication rates between single- and double-incision techniques for implant placement in gluteal augmentation from a single surgeon's experience.

Methods: Retrospective analysis of a single surgeon's implant-based gluteal augmentations was conducted between October 2018 and August 2022.

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Annexin proteins function as Ca-dependent regulators of membrane trafficking and repair that may also modulate membrane curvature. Here, using high-resolution confocal imaging, we report that the intestine-specific annexin A13 (ANX A13) localizes to the tips of intestinal microvilli and determined the crystal structure of the ANX A13a isoform to 2.6 Å resolution.

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Gender reassignment surgery has gained in popularity with increased media exposure and society's recognition of gender dysphoria. Female-to-male gender reassignment often begins with the "top" or chest surgery. Mastectomy with free nipple grafting is the most frequently described technique in the literature.

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Introduction: Facial fractures, from straightforward closed nasal reductions to complex pan facial fractures, are commonly encountered in the Plastic Surgical community. However, very little has been discussed in the literature regarding the outcomes of facial fractures relating to contributing factors. Our aim was to evaluate a battery of independent variables in order to identify, which, if any, factors correlate with suboptimal outcomes in patients who have undergone facial fracture surgery.

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Transporting and sensory epithelial cells shape apical specializations using protocadherin-based adhesion. In the enterocyte brush border, protocadherin function requires a complex of cytoplasmic binding partners, although the composition of this complex and logic governing its assembly remain poorly understood. We found that ankyrin repeat and sterile α motif domain containing 4B (ANKS4B) localizes to the tips of adherent brush border microvilli and is essential for intermicrovillar adhesion.

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Enteropathogenic Escherichia coli (EPEC) induces dramatic remodeling of enterocyte brush borders, a process that includes microvillar effacement and actin pedestal formation. Although the Arp2/3 complex is involved in formation of a branched actin network within pedestals, the fate of parallel actin bundles in microvilli during infection remains unclear. Here, we find that in polarized intestinal epithelial cells, EPEC stimulates long-range microvillar dynamics, pulling protrusions toward sites of bacterial attachment in a process mediated by the adhesion molecule protocadherin-24.

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Transporting epithelial cells build apical microvilli to increase membrane surface area and enhance absorptive capacity. The intestinal brush border provides an elaborate example with tightly packed microvilli that function in nutrient absorption and host defense. Although the brush border is essential for physiological homeostasis, its assembly is poorly understood.

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Purpose: Breast implant-associated anaplastic large-cell lymphoma (ALCL) is a recently described clinicopathologic entity that usually presents as an effusion-associated fibrous capsule surrounding an implant. Less frequently, it presents as a mass. The natural history of this disease and long-term outcomes are unknown.

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Cells communicate with neighboring cells and condition their local environment by secreting soluble factors into the extracellular space. These well-studied facets of cell biology are essential for the establishment and maintenance of physiological homeostasis. However, accumulating evidence has revealed that specific ligands, enzymes, and macromolecules are distributed into the extracellular space by virtue of their association with small vesicles, which are released by a variety of cell types.

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Recent studies from our laboratory revealed that enterocyte brush border microvilli release small vesicles laden with host defense machinery into the intestinal lumen. In this addendum, we introduce a multi-faceted model for the function of these lumenal vesicles in the gut; we also consider some of the important unanswered questions that must be addressed in order to develop our understanding of this novel aspect of innate intestinal immunity.

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The continuous monolayer of intestinal epithelial cells (IECs) lining the gut lumen functions as the site of nutrient absorption and as a physical barrier to prevent the translocation of microbes and associated toxic compounds into the peripheral vasculature. IECs also express host defense proteins such as intestinal alkaline phosphatase (IAP), which detoxify bacterial products and prevent intestinal inflammation. Our laboratory recently showed that IAP is enriched on vesicles that are released from the tips of IEC microvilli and accumulate in the intestinal lumen.

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Parry first described the syndrome of progressive facial atrophy in 1825, followed by Romberg in 1846. The clinical hallmark of the syndrome is atrophy of the facial soft tissues, including fat and muscle as well as underlying bone. Clinicians have classically reserved treatment until the end of the disease process, after the "burn out" stage.

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Perforator flaps are routinely used in upper- and lower-extremity reconstruction. Increased usage of these flaps as well as their intraoperative thinning has been described; however, there are limited reports of thinning in the postoperative period. From 2005 to 2010, thinning procedures were performed on 11 patients with 11 flaps.

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For decades, enterocyte brush border microvilli have been viewed as passive cytoskeletal scaffolds that serve to increase apical membrane surface area. However, recent studies revealed that in the in vitro context of isolated brush borders, myosin-1a (myo1a) powers the sliding of microvillar membrane along core actin bundles. This activity also leads to the shedding of small vesicles from microvillar tips, suggesting that microvilli may function as vesicle-generating organelles in vivo.

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Reconstruction of sternal nonunion following surgical resection can be difficult. Presented here is a case of sternal salvage with rigid fixation in the face of a massive aortic pseudoaneurysm. Plating is a safe and efficient technique that provides bone approximation and results in long term rigid sternal fixation.

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Squamous cell carcinoma (SCC) of the scrotum is an uncommon neoplasm. It has been described in many different occupations and is associated with a myriad of carcinogens, yet the etiology still remains a mystery. This is the first report of its occurrence in a radiation technologist.

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