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1.
Ear Nose Throat J ; : 1455613241251980, 2024 May 06.
Artigo em Inglês | MEDLINE | ID: mdl-38708589

RESUMO

Objectives: Substernal goiters often require surgery, yet their location presents challenges. Most can be removed via transcervical approach, but extent and relationship to mediastinal structures can merit consideration of sternotomy and assistance of colleagues. Despite widespread use in sinus surgery and previous literature reports, microdebrider use to facilitate transcervical removal of substernal goiters has not been broadly adopted. Our objective was to report our experience with use of the soft tissue shaver to facilitate substernal goiter deliver through a cervical incision in a community-based thyroidectomy practice. Methods: We reviewed thyroidectomy cases performed by a general otolaryngologist (D.M.Y.) in a community setting from January 2017 through December 2019. Four patients required microdebrider use for intracapsular debulking of substernal goiter to allow for transcervical removal. We discuss pre- and perioperative considerations, present computed tomography (CT) and operative images, review surgical technique, and report estimated blood loss (EBL), surgical time (T), complications, and length of stay. Results: Average EBL was 237.5 ml (range 100-500 ml). Average T was 137 minutes (range 121-170 minutes). No patients required sternotomy. One patient developed postoperative hematoma requiring evacuation and cautery of a bleeding site. No other complications were encountered, all patients were discharged after overnight observation. Conclusions: The microdebrider can be safely utilized by general otolaryngologists to facilitate transcervical removal of substernal goiters. Adoption of this familiar tool for a different surgical application can reduce the need for sternotomy, assistance of colleagues, or referral to a tertiary care center, with associated decrease in risk, morbidity, surgical time, length of stay, and cost, and improved patient convenience and satisfaction.

2.
Ear Nose Throat J ; : 1455613241235538, 2024 Feb 29.
Artigo em Inglês | MEDLINE | ID: mdl-38424691

RESUMO

Objectives: Obstructive sleep apnea (OSA) is a prevalent sleep disorder that can increase the risk of hypertension, diabetes, obesity, and cardiovascular diseases. Hypoglossal nerve stimulation (HGNS) is an alternative therapy for OSA in patients who cannot tolerate continuous positive airway pressure. Understanding the impact of HGNS on blood pressure, hemoglobin A1C (A1C), and body mass index (BMI) currently remains limited. Methods: A retrospective review study of HGNS outcomes at a single practice from January 2020 to November 2022 was conducted. Inclusion/exclusion criteria were based on HGNS eligibility and postoperative titration study. Statistical analysis and data management were performed using statistical software, R (v.4.2.1; R Core Team). Paired Student's T test, Fisher's exact test, and McNemar's exact test were utilized for statistical analysis. P values less than .05 were considered statistically significant. Results: Sixty-three patients were included in this study. A significant decrease in mean apnea-hypopnea index was noted following HGNS (mean change -28; P < .0001). Similar significant decreases were also seen in mean arterial pressures (mean change -8.4, P < .0001). There was a significant change in overall antihypertensive medication requirements and in requirements ≥3 medications (P < .0005, P = .03). There was a trend toward reduction in A1C; however, there was no change in BMI or number of diabetes medications taken. Conclusions: Our results reinforce previous findings that HGNS is an effective treatment option for carefully selected patients with OSA. In addition, our findings suggest that HGNS may improve patients' quality of life while minimizing OSA associated morbidity.

3.
Ear Nose Throat J ; : 1455613231207237, 2023 Oct 26.
Artigo em Inglês | MEDLINE | ID: mdl-37882069

RESUMO

Dysphonia and dysphagia are often observed among patients presenting to the otolaryngology clinic. One of the more common etiologies includes iatrogenic injury to the recurrent laryngeal nerve (RLN) as a known complication of head and neck surgeries such as thyroidectomy or anterior approaches to the cervical spine. Most often, RLN injury occurs in this context due to traction or transection of the nerve. No reports on delayed presentation of RLN injury from the extrusion of cervical spine hardware (screw) could be found in the peer-reviewed literature. We present a case of a 63-year-old woman who presented to the otolaryngology office with a 3-month history of hoarseness and difficulty swallowing. The patient's past medical history was significant for a motor vehicle accident (MVA) 6 years prior resulting in right arm radiculopathy and subsequent anterior cervical discectomy with spinal decompression and fusion (ACDF) at C5-C6 and C6-C7 approximately 3 months after the MVA. Strobovideolaryngoscopy revealed right vocal fold immobility. Computed tomography scan revealed that a screw from the right side of the ACDF hardware migrated approximately 2 cm with compression of the RLN. The patient underwent neck exploration with removal of the extruded hardware and microdirect laryngoscopy with right vocal fold injection laryngoplasty. Intraoperatively, the extruded screw was found embedded within the RLN fibers. This case represents the first report to our knowledge of extrusion of cervical spine hardware screw resulting in delayed RLN injury and vocal fold paralysis.

5.
Otol Neurotol ; 44(1): e13-e21, 2023 01 01.
Artigo em Inglês | MEDLINE | ID: mdl-36509437

RESUMO

OBJECTIVE: To identify populations of authors who post about cochlear implants (CIs) on Instagram and TikTok, to illustrate the content of these posts, and to elucidate factors that might help surgeons better educate CI patients. STUDY DESIGN: Qualitative study. SETTING: Instagram and TikTok social media platforms. PATIENTS: All public social media posts identified with the search terms below. Posts were excluded if unrelated to CIs or if written in a non-English language. INTERVENTION: Instagram and TikTok were searched for posts from March 2021 through September 2021 with the search terms #cochlearimplant, #cochlearimplants, #cochlearimplantkids, #cochlearkids, and #cochlearfamily. MAIN OUTCOME MEASURES: Posts were subclassified and analyzed for content including topics of posts, authorship, timeframe of posts, depiction of CIs, and popularity. RESULTS: Of 1,942 posts included in the final analysis, 1,400 were found on Instagram and 542 on TikTok. Authors were mostly patients (n = 771, 39.7%), companies (n = 568, 29.2%), and patients' family members (n = 482, 24.8%). Only 21 posts were made by physicians (1.1%). Out of 379 total educational posts examined, patients themselves were the most common authors (n = 219, 57.8%) followed by patients' family members (n = 139, 36.7%). Physicians authored only a small fraction of all educational posts (n = 19, 5.0%). CONCLUSIONS: This study showed minimal physician involvement in the CI social media spheres of Instagram and TikTok. In addition, there were few educational posts on either platform, revealing ample opportunity for physicians to become more involved with CI social media.


Assuntos
Mídias Sociais , Cirurgiões , Humanos
6.
Ear Nose Throat J ; : 1455613221112761, 2022 Aug 08.
Artigo em Inglês | MEDLINE | ID: mdl-35939505

RESUMO

INTRODUCTION: Despite the presence of a growing body of literature suggesting cost-ineffectiveness of routine pathologic analysis of tonsillectomy specimens, little is known about common institutional policies and practice patterns of pediatric otolaryngologists. The objectives of this study were to determine the prevalence of routine pathological evaluation of tonsillectomy specimens for uncomplicated pediatric adenotonsillectomy procedures and to evaluate opinions regarding this controversy among board-certified pediatric otolaryngologists. METHODS: This was a cross-sectional survey study sent to board-certified pediatric otolaryngologists currently practicing and registered with the American Society of Pediatric Otolaryngology (ASPO) assessing their institutions' or practices' current policies on sending routine tonsillectomy specimens for pathology, their experience with this practice, and their opinions on whether routine pathologic analysis should be employed. Basic statistical analysis was then conducted. RESULTS: Respondents mostly practiced in an academic setting (68.4%), with the next most common being academically affiliated private practice (21.8%), and private practice was the least common (9.8%). Most respondents (85.1%) did not agree with routine pathologic analysis of otherwise uncomplicated pediatric tonsillectomy specimens. CONCLUSION: Most pediatric otolaryngologists who responded to this survey do not support routine pathological analysis of otherwise uncomplicated pediatric tonsillectomy specimens. However, the results are likely biased and should be interpreted carefully, since only a small percentage of pediatric otolaryngologists responded to the survey. Potential cost savings could be seen by patients, payers, and hospital systems with judicious use of surgical pathology, specifically in cases with concurrent signs or symptoms suspicious for malignancy.

7.
OTO Open ; 6(1): 2473974X221086964, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35387357

RESUMO

Objective: To investigate the popular social media platforms Instagram and Facebook for public posts related to tympanostomy tubes in children, to discern attitudes and perceptions surrounding tympanostomy tubes, and to evaluate the content of social media posts related to tympanostomy tubes. Study Design: Qualitative study. Setting: Instagram and Facebook social media platforms. Methods: Instagram and Facebook were searched for public posts from 2018 and 2019 including the search terms "ear tubes,""ear tube surgery,""tympanostomy," and "myringotomy." Posts were excluded if they were unrelated to pediatric tympanostomy tubes or written in a non-English language. Relevant posts underwent subgroup analysis based on 6 domains: media type, perspective, topic, timeframe, popularity, and overall tone. Results: Of 1862 public social media posts, the majority (78.2%) were made by the patient's parents/caregivers and the rest by physicians (6.0%), hospitals (8.2%), and chiropractors (6.1%), with a few posts by the patients themselves (0.4%). The majority (79.3%) of posts portrayed tympanostomy tubes positively. Most negative posts were made by chiropractors (50.8%) and the patient's parents/caregivers (42.9%). The most common themes of posts were reassurance regarding surgery (74.9%), advertisements (12.5%), apprehension (12.4%), and education (10.3%). Conclusion: Most social media posts were made by parents/caregivers in the perioperative period, and there was a low percentage of educational posts. This information could be used by otolaryngologists to optimize their interactions with patients and parents and to potentially increase physician involvement and educational material related to tympanostomy tubes on social media.

8.
Am J Otolaryngol ; 43(2): 103388, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35144105

RESUMO

INTRODUCTION: Social media platforms are constantly evolving and expanding to new populations, exposing their users to various topics and serving as an informal educational resource. Medical ideas and topics are freely discussed online, making understanding of what is present on these platforms of particular importance to the practicing medical professional. In the field of otolaryngology, the public social media portrayal of sinus surgery has not been previously reported. METHODS: Social media posts using keywords related to sinus surgery on Facebook, Instagram, and TikTok were qualitatively analyzed and categorized based on media type, author, subject, timing, depiction, and popularity. RESULTS: The total number of posts included in final analysis was 1798, with a majority stemming from Instagram (68.5%), then Facebook (20.2%) and finally TikTok (11.3%). The most common type of media analyzed was images (69.0%) and patients were more often authors of posts (45.1%) as compared to physicians (34.8%). The subjects of the posts were nearly equally reassurance regarding surgery (41.3%) and educational or informational posts (38.8%) and were most commonly timed in the postoperative period (41.3%). Sinus surgery was depicted in a positive fashion most frequently (56.6%), notably compared against the negative portrayal at 3.2%. Negative posts most commonly cited postoperative pain or bleeding. CONCLUSIONS: Most social media posts analyzed in this multi-platform study depicted sinus surgery in a positive fashion. Patients tended to post in the postoperative or perioperative period, whereas physicians tender to post intraoperative educational posts. Negative posts were most commonly centered around postoperative pain. Cautious interpretation of these results could be used for improving patient care and outreach in the digital age.


Assuntos
Mídias Sociais , Humanos
9.
Ear Nose Throat J ; 101(6): 368-371, 2022 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-32986491

RESUMO

Pilomatricomas are benign skin tumors often encountered by otolaryngologists but frequently misdiagnosed. Although they can occur at any age, they commonly present in children as a discolored superficial lesion adhered to the overlying skin. Accurate preoperative diagnosis is crucial for appropriate management, which is surgical in most cases. Here, we present bilateral pilomatricomas mimicking features of several other diagnoses in a pediatric patient. The patient was successfully treated with surgical excision. This case presented a unique diagnostic challenge, as the lesions exhibited features of several common diagnoses. In general, surgical management of pilomatricoma is curative, and recurrence is rare.


Assuntos
Doenças do Cabelo , Pilomatrixoma , Neoplasias Cutâneas , Criança , Doenças do Cabelo/diagnóstico , Doenças do Cabelo/patologia , Doenças do Cabelo/cirurgia , Humanos , Otorrinolaringologistas , Pilomatrixoma/diagnóstico , Pilomatrixoma/patologia , Pilomatrixoma/cirurgia , Pele/patologia , Neoplasias Cutâneas/diagnóstico , Neoplasias Cutâneas/patologia , Neoplasias Cutâneas/cirurgia
10.
Cureus ; 14(12): e32755, 2022 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-36686132

RESUMO

BACKGROUND: The benefits and challenges of successful breastfeeding for both mother and child have been well-established in the literature. While ankyloglossia, or tongue tie, alone or in combination with upper lip tie has been the focus of several previous studies, very few have directly addressed isolated symptomatic upper lip tie and the role of surgical correction for breastfeeding difficulties. MATERIALS AND METHODS: Seven infants with isolated upper lip tie and breastfeeding difficulty were taken to the operating room for labial frenotomy. These infants were assessed at their follow-up visits for their degree of weight gain since their procedure. Their mothers were surveyed regarding their experiences with breastfeeding since the frenotomy was performed. RESULTS: In this article, we present seven infants with isolated upper lip tie and breastfeeding difficulty who were treated with labial frenotomy. Subsequently, these infants demonstrated improved weight gain, and all mothers reported increased ease of breastfeeding. CONCLUSION: These findings implicate lip tie as an underrecognized cause of breastfeeding difficulty and suggest that labial frenotomy is an effective treatment in these patients. Larger-scale randomized controlled studies are necessary to further evaluate this topic.

11.
Ear Nose Throat J ; : 1455613211059468, 2021 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-34851765

RESUMO

INTRODUCTION: Despite the presence of clinical practice guidelines for overnight admission of pediatric patients following adenotonsillectomy, variance in practice patterns exists between pediatric otolaryngologists. The purpose of this study is to examine severity of apnea-hypopnea index (AHI) as an independent predictor of postoperative respiratory complications in children undergoing adenotonsillectomy. METHODS: Retrospective chart review of all children undergoing adenotonsillectomy at a large tertiary referral center between January 2015 and December 2019 who underwent preoperative polysomnography and were admitted for overnight observation. Charts were reviewed for total adverse events and respiratory events occurring during admission. RESULTS: Overall, respiratory events were seen in 50.6% of patients with AHI ≥10 and in 39.6% of patients with AHI <10. The overall mean AHI was 19.2, with a mean of 28.1 in the AHI ≥10 subgroup vs 4.6 in the AHI <10 subgroup. There was no statistical correlation or increased risk between an AHI ≥10 and having a pure respiratory event, with a relative risk of 1.19 (.77-1.83, P = .43). There was a statistically significant difference between the mean AHI of those with any adverse event and those without (21.6 vs 13.4, P = .008). There is additionally an increased risk of any event with an AHI over 10, with a relative risk of 1.51 (1.22-1.88, P < .0001). CONCLUSION: Preoperative AHI of 10 events per hour was not a predictor of postoperative respiratory complications. However, there was a trend for those with a higher AHI requiring additional supportive measures or a prolonged stay. Practitioners should always use their best judgment in deciding whether a child warrants postoperative admission following adenotonsillectomy.

13.
Cureus ; 13(12): e20794, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-35111474

RESUMO

One year ago, shortly after the onset of the coronavirus disease 2019 (COVID-19) pandemic, we published our initial experience with telemedicine. We showed that during the early pandemic, there was a dramatic shift to telemedicine and that 70% of our patients would decline telemedicine in favor of an in-person visit. As clinical limitations and stay-at-home orders relaxed, we sought to define how we have used telemedicine since. After the initial month of the pandemic, our utilization of telemedicine fell to an average of only 5% of visits over the past year. Nearly 80% of all telemedicine visits were routine follow-up visits, with its usage being unaffected by local policy and pandemic surges. The usefulness and applications of telemedicine have been well described; however, after our initial reliance on telemedicine, its use has been minimal. Moving forward, attention will need to focus on innovation and expanding comprehensive virtual examinations for otolaryngology to fully embrace this technology.

14.
Laryngoscope ; 130(11): 2568-2573, 2020 11.
Artigo em Inglês | MEDLINE | ID: mdl-32740925

RESUMO

OBJECTIVES/HYPOTHESIS: The COVID-19 pandemic has led to unprecedented global changes in the delivery of healthcare over a short period of time. With the implementation of shelter-in-place orders, otolaryngology clinic visits at our institution were transitioned to telemedicine. This change enabled the rapid characterization of the patients who accepted and declined telemedicine. STUDY DESIGN: Cross-sectional analysis. METHODS: A review was conducted of 525 otolaryngology patients at a tertiary-care referral center with scheduled visits requiring rescheduling to a future date or a telemedicine visit. Visit, demographic information, and reason for deferring telemedicine were collected for analysis. RESULTS: Seventy-two percent of patients declined a telemedicine visit, with the most common reason being the lack of a physical exam (97%). There was an even distribution of demographics between those who accepted and declined visits. There was an association between declining telemedicine with older age (P = .0004) and otology visits (P = .0003), whereas facial plastics patients were more likely to accept (P < .0001). Patients scheduled earlier during the pandemic were more likely to accept a visit with a median of 28 days from onset of shelter-in-place orders versus 35 for those who declined (P < .0001). CONCLUSIONS: We describe our initial experience with a transition to telemedicine, where the majority of patients would decline a virtual visit due to the lack of a physical exam. Although the future remains uncertain, telemedicine will continue to play a vital role in healthcare delivery. We believe that understanding our patient base gives critical insights that will help guide and improve virtual care to meet patients' needs. LEVEL OF EVIDENCE: 4 Laryngoscope, 130:2568-2573, 2020.


Assuntos
COVID-19 , Otolaringologia/métodos , Aceitação pelo Paciente de Cuidados de Saúde/estatística & dados numéricos , Padrões de Prática Médica/estatística & dados numéricos , Telemedicina/métodos , Estudos Transversais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Aceitação pelo Paciente de Cuidados de Saúde/psicologia , SARS-CoV-2
16.
Cureus ; 12(12): e12244, 2020 Dec 23.
Artigo em Inglês | MEDLINE | ID: mdl-33500863

RESUMO

BACKGROUND: Obstructive sleep apnea (OSA) is a source of significant morbidity in children. Polysomnography (PSG), the gold standard diagnostic tool for OSA, is often unavailable due to patient financial and geographic constraints. Our objective is to analyze the relationship between a patient's subjective complaints and the results from their PSG to determine the diagnostic value of the Pediatric Sleep Questionnaire (PSQ) for detecting OSA in children. METHODS: A retrospective chart review was conducted for pediatric patients with suspected OSA from March 2012 to January 2014. Preoperative PSQ scores were compared with the results from PSG in the form of Apnea-Hypopnea Index (AHI) and Respiratory Disturbance Index (RDI) values. AHI and RDI values ranging from 1 to 5 were classified as mild OSA while values ranging from 5 to 10 were classified as moderate OSA. RESULTS: A total of 161 patients were recruited for this study with 63 patients (39%) both completing the PSQ and undergoing PSG. Sensitivity of the positive questionnaire was higher in patients with AHI and RDI values indicative of moderate OSA (95% and 100% respectively) versus values indicative of mild OSA (83% and 86% respectively). Conversely, the positive predictive value of the positive questionnaire (n=49) was lower in patients with AHI and RDI values indicative of moderate OSA (39% and 46% respectively) versus values indicative of mild OSA (70% and 80% respectively). CONCLUSION: The PSQ has high diagnostic value for screening patients with suspected OSA. We recommend the use of the PSQ in the primary care setting for children with suspected OSA.

17.
Int J Pediatr Otorhinolaryngol ; 123: 75-78, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-31077906

RESUMO

Munchausen syndrome by proxy (MSBP) is a condition diagnosed when a caregiver knowingly fabricates or inflicts illness on another for his/her own gain. Typical cases of MSBP detected by otolaryngologists involve facial trauma or otologic injury, while descriptions involving the nose are rare. Destructive nasal lesions have a broad differential diagnosis and may require visits to numerous specialists, placing strain on both the patient and the healthcare system. Early recognition of MSBP in patients with chronic nasal destruction may prevent such unnecessary strain. We present a case of MSBP involving two half-brothers with unexplainable nasal destruction and discuss the literature and current recommendations for managing the diagnosis.


Assuntos
Epistaxe/etiologia , Síndrome de Munchausen Causada por Terceiro/complicações , Síndrome de Munchausen Causada por Terceiro/diagnóstico , Deformidades Adquiridas Nasais/etiologia , Nariz/lesões , Doença Crônica , Diagnóstico Diferencial , Humanos , Lactente , Masculino , Irmãos
18.
Int J Pediatr Otorhinolaryngol ; 122: 40-43, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-30951971

RESUMO

OBJECTIVE: In 2013 the American Academy of Otolaryngology published tympanostomy tube guidelines for children; Action Statement 6 recommends against tube placement without middle ear effusion (MEE) at time of assessment. To date, little research has directly evaluated this recommendation in reducing the need for ear tubes. We evaluated the effectiveness of this recommendation and potential risk factors that influence the success of watchful waiting. METHODS: Retrospective chart review collecting demographics, daycare status, smoking exposure, and time of year of visit. Children aged 6 months to 12 years without MEE on presentation, but with 3 or more episodes of acute otitis media (AOM) in 6 months or 4 or more episodes in 12 months, were assigned to watchful waiting (WW) treatment. These patients were followed every 4 months or returned sooner with additional infections. Any continued AOM, or MEE on follow up leading to tube placement, defined WW failure. RESULTS: 123 patients met criteria, with 81 still in WW to date (66% success rate). 42 children failed WW and received tympanostomy tubes (34% failure rate). There were no statistically significant associations between age, race, gender, smoking exposure, daycare, or month of presentation between children who failed WW compared to children receiving tubes. CONCLUSIONS: Tympanostomy tube guidelines mitigate unnecessary tube placement in a majority of children with recurrent AOM without MEE. To our knowledge, this is the first study supporting the 2013 recommendations, with a 66% success rate. Additionally, no significant associations between modifying risk factors in those who failed watchful waiting were identified.


Assuntos
Ventilação da Orelha Média/estatística & dados numéricos , Otite Média/terapia , Procedimentos Desnecessários , Conduta Expectante/estatística & dados numéricos , Criança , Pré-Escolar , Feminino , Humanos , Lactente , Masculino , Otite Média com Derrame/cirurgia , Guias de Prática Clínica como Assunto , Recidiva , Estudos Retrospectivos , Fatores de Risco , Falha de Tratamento
19.
Int J Pediatr Otorhinolaryngol ; 117: 167-170, 2019 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-30579074

RESUMO

We report the case of a 37-week old newborn presenting on day 1 of life with an apparent congenital fusion of the tongue to the hard palate, consistent with Ankyloglossum Superius syndrome. Physical exam along with endoscopy showed apparent fusion of the floor of the mouth to the anterior hard palate displacing the tongue into the nasal cavity and obstructing the oral airway. The child was nasotracheally intubated and brought to the operating room for lysis of the fusion under binocular microscopy. We review the literature on this rare condition and provide an algorithm for evaluating the neonatal airway in the setting of congenital oral abnormalities.


Assuntos
Obstrução das Vias Respiratórias/congênito , Obstrução das Vias Respiratórias/cirurgia , Palato Duro/anormalidades , Língua/anormalidades , Anormalidades Congênitas/diagnóstico por imagem , Anormalidades Congênitas/cirurgia , Endoscopia , Humanos , Recém-Nascido , Masculino , Palato Duro/diagnóstico por imagem , Síndrome , Língua/diagnóstico por imagem
20.
Breast Cancer Res ; 17: 112, 2015 Aug 19.
Artigo em Inglês | MEDLINE | ID: mdl-26286584

RESUMO

INTRODUCTION: The steady increase in the incidence of obesity among adults has been paralleled with higher levels of obesity-associated breast cancer. While recent studies have suggested that adipose stromal/stem cells (ASCs) isolated from obese women enhance tumorigenicity, the mechanism(s) by which this occurs remains undefined. Evidence suggests that increased adiposity results in increased leptin secretion from adipose tissue, which has been shown to increased cancer cell proliferation. Previously, our group demonstrated that ASCs isolated from obese women (obASCs) also express higher levels of leptin relative to ASCs isolated from lean women (lnASCs) and that this obASC-derived leptin may account for enhanced breast cancer cell growth. The current study investigates the impact of inhibiting leptin expression in lnASCs and obASCs on breast cancer cell (BCC) growth and progression. METHODS: Estrogen receptor positive (ER+) BCCs were co-cultured with leptin shRNA lnASCs or leptin shRNA obASCs and changes in the proliferation, migration, invasion, and gene expression of BCCs were investigated. To assess the direct impact of leptin inhibition in obASCs on BCC proliferation, MCF7 cells were injected alone or mixed with control shRNA obASCs or leptin shRNA obASCs into SCID/beige mice. RESULTS: ER+ BCCs were responsive to obASCs during direct co-culture, whereas lnASCs were unable to increase ER(+) BCC growth. shRNA silencing of leptin in obASCs negated the enhanced proliferative effects of obASC on BCCs following direct co-culture. BCCs co-cultured with obASCs demonstrated enhanced expression of epithelial-to-mesenchymal transition (EMT) and metastasis genes (SERPINE1, MMP-2, and IL-6), while BCCs co-cultured with leptin shRNA obASCs did not display similar levels of gene induction. Knockdown of leptin significantly reduced tumor volume and decreased the number of metastatic lesions to the lung and liver. These results correlated with reduced expression of both SERPINE1 and MMP-2 in tumors formed with MCF7 cells mixed with leptin shRNA obASCs, when compared to tumors formed with MCF7 cells mixed with control shRNA obASCs. CONCLUSION: This study provides mechanistic insight as to how obesity enhances the proliferation and metastasis of breast cancer cells; specifically, obASC-derived leptin contributes to the aggressiveness of breast cancer in obese women.


Assuntos
Tecido Adiposo/metabolismo , Neoplasias da Mama/metabolismo , Proliferação de Células/genética , Leptina/metabolismo , Metástase Neoplásica/genética , Células-Tronco/metabolismo , Células Estromais/metabolismo , Adipócitos/metabolismo , Adipócitos/patologia , Tecido Adiposo/patologia , Adiposidade/genética , Animais , Mama/metabolismo , Mama/patologia , Neoplasias da Mama/genética , Neoplasias da Mama/patologia , Carcinogênese/genética , Carcinogênese/patologia , Linhagem Celular Tumoral , Movimento Celular/genética , Técnicas de Cocultura/métodos , Transição Epitelial-Mesenquimal/genética , Feminino , Regulação Neoplásica da Expressão Gênica/genética , Regulação Neoplásica da Expressão Gênica/fisiologia , Humanos , Interleucina-6/genética , Interleucina-6/metabolismo , Células MCF-7 , Metaloproteinase 2 da Matriz/genética , Metaloproteinase 2 da Matriz/metabolismo , Camundongos , Camundongos SCID , Metástase Neoplásica/patologia , Obesidade/genética , Obesidade/metabolismo , Obesidade/patologia , Inibidor 1 de Ativador de Plasminogênio/genética , Inibidor 1 de Ativador de Plasminogênio/metabolismo , RNA Interferente Pequeno/genética , Receptores de Estrogênio/genética , Células-Tronco/patologia , Células Estromais/patologia
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