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1.
Am Surg ; : 31348241244636, 2024 Jun 02.
Article in English | MEDLINE | ID: mdl-38825791

ABSTRACT

BACKGROUND: Provider burnout is a work-related syndrome that is under-recognized, under-reported, and has negative repercussions on the individual, system, and patients. This study investigated burnout incidence and its association with wellness characteristics such as resilience, psychological safety, and perceptions of the workplace to inform future work in improving well-being. METHODS: Electronic surveys were sent to 153 physicians and advanced practice providers (APPs) in the department of surgery at a single institution. Survey topics included demographics, intention to stay, engagement, and items from validated measures for workplace perceptions including work pace/stress (Mini Z), burnout, psychological safety, and resilience. Descriptive statistics, bivariate associations, and logistic regression were used to evaluate responses. RESULTS: Overall response rate was 47%. The majority of providers reported feeling burned out (56%), and 48% indicated they would probably leave the organization within three years. Additionally, 61% reported being satisfied with their job and 55% felt that they contributed professionally in the ways they value most (meaningful work/engagement). Significant predictors for burnout included negative work environment perceptions (work pace/stress), low resilience, low meaningful work, and professional role (physician vs APP). DISCUSSION: Maintaining a healthy workforce requires investigation into the factors that support workplace well-being. The strongest predictors of burnout were work pace/stress. Protective factors against burnout were psychological safety and resilience. An organizational culture that promotes psychological safety, as well as workplace improvements to enhance providers' sense of meaning in work, and decreasing work pace and stress may contribute to the prevention of burnout and the retention.

2.
Am Surg ; : 31348241244643, 2024 Apr 22.
Article in English | MEDLINE | ID: mdl-38648008

ABSTRACT

OBJECTIVES: Successful leaders influence the group they represent. Effective surgical care is tied to its leadership climate. However, most surgical providers are not attuned to their individual strengths which if known they could leverage them within their teams. This study identifies leadership types within a department of surgery which may be used to better understand and cultivate their strengths. METHODS: In 2022, 172 providers in an academic surgery department were offered the GallupTM CliftonStrengths assessment, a proprietary instrument that maps 34 strengths across 4 domains of leadership. The assessment provides a respondent with their top 5 strengths and the domain in which they naturally "lead". RESULTS: Of 172 providers, 127 (74%) completed the assessment. While providers have strengths in multiple domains, they "lead with" a specific domain. Mapped from the providers' top 10 strengths, the most common "lead with" domain for surgical providers was Executing: the ability to implement ideas and produce results. Strategic Thinking: those who are analytical and push teams forward and Relationship Building: the ability to create strong and effective teams were followed by the least common domain. Influencing: the ability to communicate ideas and lead others. Formal leaders were significantly more likely to lead with Strategic Thinking. There were no significant differences between APPs and physicians. CONCLUSION: A majority of surgical providers "lead with" the GallupTM Executing domain. Those who lead with executing skills work tirelessly to produce outcomes. Learning to leverage the strengths of our teams to create cohesion and efficiency may improve engagement and retention.

3.
J Womens Health (Larchmt) ; 31(8): 1071-1078, 2022 08.
Article in English | MEDLINE | ID: mdl-35980244

ABSTRACT

This proceeding summarizes a symposium on multidisciplinary management of menopause held on July 30, 2021 as part of the Health of Women 2021 conference. The workshop featured presentations by national experts who provided insights into multidisciplinary approaches to the management of menopause, vasomotor symptoms and genitourinary syndrome of menopause, bone health (including osteoporosis, muscular strength, and mobility), as well as sexual and psychological health during menopause. In this study, we highlight the major points of each presentation and the resultant discussion.


Subject(s)
Osteoporosis , Societies, Medical , Female , Humans , Menopause , Sexual Behavior , Syndrome , Women's Health
4.
Child Abuse Negl ; 130(Pt 2): 105598, 2022 08.
Article in English | MEDLINE | ID: mdl-35370012

ABSTRACT

The prevalence of substance use among transracial and international adoptees is higher than that of non-adopted persons, and yet no specialized treatment modalities exist for this underserved population. Our purpose is to propose a substance use disorder (SUD) prevention program for transracial adoptive families that addresses the specific issues that face this community. There are several pre- and post-adoption factors which position transracial and international adoptees (TRIAs) to be at higher risk to develop SUDs. Some of these factors include adoption identity, trauma, loss, genetics, and racial discrimination. The biopsychosocial (BPS) model (Engel, 1977) is used to conceptualize SUDs in adoptees, and theories that focus on adoption-related development issues such as the Adoptee Stress and Coping Model (Brodzinsky, 1990) are also presented. Our proposed program, Strengthening Transracial Adoptive Families (STAF), utilizes the Guiding Good Choices (GGC) prevention program as its foundation to integrate a culturally responsive adoption-focused curriculum to best serve transracial adoptive families.


Subject(s)
Child, Adopted , Racism , Substance-Related Disorders , Adolescent , Adoption/psychology , Child , Humans , Prevalence , Substance-Related Disorders/prevention & control
5.
Plast Reconstr Surg Glob Open ; 10(1): e4037, 2022 Jan.
Article in English | MEDLINE | ID: mdl-35186617

ABSTRACT

The deep inferior epigastric artery perforator (DIEP) flap for breast reconstruction has been popularized over the transverse rectus abdominis myocutaneous (TRAM) flap, as it spares rectus abdominis muscle and has low donor site morbidity. This progression to muscle preservation, however, has been associated with an increased difficulty in vascular dissection, perfusion-related complications, and lengthier surgical times. We pilot a technique that may achieve the benefits of the TRAM flap in terms of ease of dissection and vascularity, with the benefits of the DIEP flap in terms of maintaining rectus abdominis continuity. METHODS: A cohort of six consecutive patients underwent a free TRAM flap for reconstructive surgery. All patients underwent a segmental, periumbilical harvest of rectus abdominis muscle as part of flap design, and the segmental defect was reconstructed with an innervated rectus abdominis perforator turndown (RAPT) flap harvested supraumbilically. Postoperative assessment of rectus continuity was performed clinically, with muscle electromyography and ultrasound. RESULTS: In all six cases, there was successful TRAM flap transfer, with no flap-related complications. Rectus abdominis muscle reconstruction with the RAPT flap was achieved, with continuity and function of the rectus muscle confirmed. CONCLUSIONS: We describe the innervated RAPT flap for reconstitution of rectus continuity after TRAM flap harvest. This technique may achieve the benefits of the TRAM flap in terms of ease of dissection and flap vascularity, and the benefits of the DIEP flap in terms of maintaining rectus abdominis continuity.

7.
ANZ J Surg ; 91(3): 415-419, 2021 03.
Article in English | MEDLINE | ID: mdl-33538101

ABSTRACT

BACKGROUND: In Australia, the COVID-19 pandemic has caused severe social disruptions, including restrictions to the movement of people. Healthcare centres around the world have seen changes in the nature of injuries acquired during the COVID-19 pandemic; we therefore hypothesize that social isolation measures have changed the pattern of plastic and reconstructive surgery presentations. METHODS: A prospective cohort study was designed comparing patient presentations during the enforced COVID-19 lockdown to two previous periods. All emergency referrals requiring operative intervention by the plastic and reconstructive surgery unit of our institution were included. Patient demographics, place and mechanism of injury, drug and alcohol involvement, delays to presentation, length of admission and complication rates were collected. RESULTS: Demographics and complication rates were similar across all groups. A 31.8% reduction in total number of emergency cases was seen during the lockdown period. Increase in do-it-yourself injuries (P = 0.001), bicycle injuries (P = 0.001) and injuries acquired via substance abuse (P = 0.041) was observed. Head and neck injuries, mostly due to animal bites and falls, were also more prevalent compared to the same period the previous year (P = 0.007). As expected, over 80% of plastic surgery operations during the COVID-19 period were due to injuries acquired at home, a significant increase compared to previous periods. CONCLUSION: Despite changes in the pattern of presentations requiring plastic and reconstructive emergency surgery, traumatic injuries continued to occur during the pandemic. Thus, planning will be essential to ensure resource allocation for emergency procedures is sustained as second and third waves of COVID-19 cases emerge worldwide.


Subject(s)
COVID-19/epidemiology , Emergencies , Pandemics , Quarantine , Adult , Comorbidity , Female , Humans , Male , Prospective Studies , Plastic Surgery Procedures , SARS-CoV-2 , Victoria/epidemiology
8.
Genes (Basel) ; 11(2)2020 02 19.
Article in English | MEDLINE | ID: mdl-32093067

ABSTRACT

Genome size varies widely across organisms yet has not been found to be related to organismal complexity in eukaryotes. While there is no evidence for a relationship with complexity, there is evidence to suggest that other phenotypic characteristics, such as nucleus size and cell-cycle time, are associated with genome size, body size, and development rate. However, what is unknown is how the selection for divergent phenotypic traits may indirectly affect genome size. Drosophila melanogaster were selected for small and large body size for up to 220 generations, while Cochliomyia macellaria were selected for 32 generations for fast and slow development. Size in D. melanogaster significantly changed in terms of both cell-count and genome size in isolines, but only the cell-count changed in lines which were maintained at larger effective population sizes. Larger genome sizes only occurred in a subset of D. melanogaster isolines originated from flies selected for their large body size. Selection for development time did not change average genome size yet decreased the within-population variation in genome size with increasing generations of selection. This decrease in variation and convergence on a similar mean genome size was not in correspondence with phenotypic variation and suggests stabilizing selection on genome size in laboratory conditions.


Subject(s)
Biological Variation, Population/genetics , Diptera/genetics , Genome Size/genetics , Animals , Body Size/genetics , Drosophila melanogaster/genetics , Drosophila melanogaster/growth & development , Genetic Variation/genetics , Genome/genetics , Phenotype , Population Density , Selection, Genetic/genetics
9.
Phys Ther ; 100(7): 1153-1162, 2020 07 19.
Article in English | MEDLINE | ID: mdl-31998949

ABSTRACT

BACKGROUND: Falls are the leading cause of injuries among older adults, and trips and slips are major contributors to falls. OBJECTIVE: The authors sought to compare the effectiveness of adding a component of surface perturbation training to usual gait/balance training for reducing falls and fall-related injury in high-risk older adults referred to physical therapy. DESIGN: This was a multi-center, pragmatic, randomized, comparative effectiveness trial. SETTING: Treatment took place within 8 outpatient physical therapy clinics. PATIENTS: This study included 506 patients 65+ years of age at high fall risk referred for gait/balance training. INTERVENTION: This trial evaluated surface perturbation treadmill training integrated into usual multimodal exercise-based balance training at the therapist's discretion versus usual multimodal exercise-based balance training alone. MEASUREMENTS: Falls and injurious falls were assessed with a prospective daily fall diary, which was reviewed via telephone interview every 3 months for 1 year.A total of 211/253 (83%) patients randomized to perturbation training and 210/253 (83%) randomized to usual treatment provided data at 3-month follow-up. At 3 months, the perturbation training group had a significantly reduced chance of fall-related injury (5.7% versus 13.3%; relative risk 0.43) but no significant reduction in the risk of any fall (28% versus 37%, relative risk 0.78) compared with usual treatment. Time to first injurious fall showed reduced hazard in the first 3 months but no significant reduction when viewed over the entire first year. LIMITATIONS: The limitations of this trial included lack of blinding and variable application of interventions across patients based on pragmatic study design. CONCLUSION: The addition of some surface perturbation training to usual physical therapy significantly reduced injurious falls up to 3 months posttreatment. Further study is warranted to determine the optimal frequency, dose, progression, and duration of surface perturbation aimed at training postural responses for this population.


Subject(s)
Accidental Falls , Exercise Therapy/statistics & numerical data , Gait/physiology , Physical Therapy Modalities , Postural Balance/physiology , Accidental Falls/prevention & control , Accidental Falls/statistics & numerical data , Aged , Female , Humans , Male
10.
Breast J ; 26(4): 711-715, 2020 04.
Article in English | MEDLINE | ID: mdl-31602711

ABSTRACT

Fat necrosis is a common complication of autologous breast reconstruction; however, diagnostic criteria are yet to be standardized, making comparison of autologous breast reconstructive techniques challenging. A systematic review found six of 556 articles met inclusion criteria. These results were used to generate an algorithm for managing fat necrosis after autologous breast reconstruction.


Subject(s)
Breast Neoplasms , Fat Necrosis , Mammaplasty , Breast/diagnostic imaging , Breast/surgery , Breast Neoplasms/surgery , Fat Necrosis/etiology , Female , Humans , Mammaplasty/adverse effects , Systematic Reviews as Topic
11.
PLoS One ; 13(4): e0195489, 2018.
Article in English | MEDLINE | ID: mdl-29659609

ABSTRACT

BACKGROUND: Optimal management of osteoarthritis requires active patient participation. Understanding patients' perceived health information needs is important in order to optimize health service delivery and health outcomes in osteoarthritis. We aimed to review the existing literature regarding patients' perceived health information needs for OA. METHODS: A systematic scoping review was performed of publications in MEDLINE, EMBASE, CINAHL and PsycINFO (1990-2016). Descriptive data regarding study design and methodology were extracted and risk of bias assessed. Aggregates of patients' perceived needs of osteoarthritis health information were categorized. RESULTS: 30 studies from 2876 were included: 16 qualitative, 11 quantitative and 3 mixed-methods studies. Three areas of perceived need emerged: (1) Need for clear communication: terms used were misunderstood or had unintended connotations. Patients wanted clear explanations. (2) Need for information from various sources: patients wanted accessible health professionals with specialist knowledge of arthritis. The Internet, whilst a source of information, was acknowledged to have dubious reliability. Print media, television, support groups, family and friends were utilised to fulfil diverse information needs. (3) Needs of information content: patients desired more information about diagnosis, prognosis, management and prevention. CONCLUSIONS: Patients desire more information regarding the diagnosis of osteoarthritis, its impact on daily life and its long-term prognosis. They want more information not only about pharmacological management options, but also non-pharmacological options to help them manage their symptoms. Also, patients wanted this information to be delivered in a clear manner from multiple sources of health information. To address these gaps, more effective communication strategies are required. The use of a variety of sources and modes of delivery may enable the provision of complementary material to provide information more successfully, resulting in better patient adherence to guidelines and improved health outcomes.


Subject(s)
Health Information Systems , Health Knowledge, Attitudes, Practice , Osteoarthritis , Humans
12.
PLoS Genet ; 10(7): e1004522, 2014 Jul.
Article in English | MEDLINE | ID: mdl-25057905

ABSTRACT

We determined female genome sizes using flow cytometry for 211 Drosophila melanogaster sequenced inbred strains from the Drosophila Genetic Reference Panel, and found significant conspecific and intrapopulation variation in genome size. We also compared several life history traits for 25 lines with large and 25 lines with small genomes in three thermal environments, and found that genome size as well as genome size by temperature interactions significantly correlated with survival to pupation and adulthood, time to pupation, female pupal mass, and female eclosion rates. Genome size accounted for up to 23% of the variation in developmental phenotypes, but the contribution of genome size to variation in life history traits was plastic and varied according to the thermal environment. Expression data implicate differences in metabolism that correspond to genome size variation. These results indicate that significant genome size variation exists within D. melanogaster and this variation may impact the evolutionary ecology of the species. Genome size variation accounts for a significant portion of life history variation in an environmentally dependent manner, suggesting that potential fitness effects associated with genome size variation also depend on environmental conditions.


Subject(s)
Adaptation, Physiological/genetics , Biological Evolution , Drosophila melanogaster/genetics , Genome Size , Animals , Environment , Female , Genetic Variation , Genome, Insect , Insect Hormones/genetics
13.
Genome Res ; 24(7): 1193-208, 2014 Jul.
Article in English | MEDLINE | ID: mdl-24714809

ABSTRACT

The Drosophila melanogaster Genetic Reference Panel (DGRP) is a community resource of 205 sequenced inbred lines, derived to improve our understanding of the effects of naturally occurring genetic variation on molecular and organismal phenotypes. We used an integrated genotyping strategy to identify 4,853,802 single nucleotide polymorphisms (SNPs) and 1,296,080 non-SNP variants. Our molecular population genomic analyses show higher deletion than insertion mutation rates and stronger purifying selection on deletions. Weaker selection on insertions than deletions is consistent with our observed distribution of genome size determined by flow cytometry, which is skewed toward larger genomes. Insertion/deletion and single nucleotide polymorphisms are positively correlated with each other and with local recombination, suggesting that their nonrandom distributions are due to hitchhiking and background selection. Our cytogenetic analysis identified 16 polymorphic inversions in the DGRP. Common inverted and standard karyotypes are genetically divergent and account for most of the variation in relatedness among the DGRP lines. Intriguingly, variation in genome size and many quantitative traits are significantly associated with inversions. Approximately 50% of the DGRP lines are infected with Wolbachia, and four lines have germline insertions of Wolbachia sequences, but effects of Wolbachia infection on quantitative traits are rarely significant. The DGRP complements ongoing efforts to functionally annotate the Drosophila genome. Indeed, 15% of all D. melanogaster genes segregate for potentially damaged proteins in the DGRP, and genome-wide analyses of quantitative traits identify novel candidate genes. The DGRP lines, sequence data, genotypes, quality scores, phenotypes, and analysis and visualization tools are publicly available.


Subject(s)
Drosophila melanogaster/genetics , Genetic Variation , Genome, Insect , Phenotype , Animals , Chromatin/genetics , Chromatin/metabolism , Drosophila melanogaster/microbiology , Female , Genetic Linkage , Genome Size , Genome-Wide Association Study , Genotype , Genotyping Techniques , High-Throughput Nucleotide Sequencing , INDEL Mutation , Linkage Disequilibrium , Male , Molecular Sequence Annotation , Polymorphism, Single Nucleotide , Quantitative Trait, Heritable , Reproducibility of Results
14.
Mech Dev ; 129(5-8): 177-91, 2012 Jul.
Article in English | MEDLINE | ID: mdl-22554671

ABSTRACT

p24 proteins comprise a family of type-I transmembrane proteins of ~24kD that are present in yeast and plants as well as metazoans ranging from Drosophila to humans. These proteins are most commonly localized to the endoplasmic reticulum (ER)-Golgi interface and are incorporated in anterograde and retrograde transport vesicles. Little is known about how disruption of p24 signaling affects individual tissue function or whole animals. Drosophila melanogaster express nine p24 genes, grouped into four subfamilies. Based upon our mRNA and protein expression data, Drosophila p24 family members are expressed in a variety of tissues. To identify functions for particular Drosophila p24 proteins, we used RNA interference (RNAi) to reduce p24 expression. Ubiquitous reduction of most p24 genes resulted in complete or partial lethality during development. We found that reducing p24 levels in adults caused defects in female fecundity (egg laying) and also reduced male fertility. We attributed reduced female fecundity to decreased neural p24 expression. These results provide the first genetic analysis of all p24 family members in a multicellular animal and indicate vital roles for Drosophila p24s in development and reproduction, implicating neural expression of p24s in the regulation of female behavior.


Subject(s)
Drosophila Proteins/metabolism , Drosophila melanogaster/growth & development , Drosophila melanogaster/metabolism , Membrane Proteins/metabolism , Aging/metabolism , Animals , Female , Fertility , Immune Sera , Male , Mutation/genetics , Neurons/metabolism , Octopamine/metabolism , Oviposition , Peptides/metabolism , Protein Transport , RNA Interference , Reproduction , Survival Analysis
15.
Genetics ; 187(1): 157-69, 2011 Jan.
Article in English | MEDLINE | ID: mdl-20980240

ABSTRACT

Behavior is influenced by an organism's genes and environment, including its interactions with same or opposite sex individuals. Drosophila melanogaster perform innate, yet socially modifiable, courtship behaviors that are sex specific and require rapid integration and response to multiple sensory cues. Furthermore, males must recognize and distinguish other males from female courtship objects. It is likely that perception, integration, and response to sex-specific cues is partially mediated by changes in gene expression. Reasoning that social interactions with members of either sex would impact gene expression, we compared expression profiles in heads of males that courted females, males that interacted with other males, or males that did not interact with another fly. Expression of 281 loci changes when males interact with females, whereas 505 changes occur in response to male-male interactions. Of these genes, 265 are responsive to encounters with either sex and 240 respond specifically to male-male interactions. Interestingly, 16 genes change expression only when a male courts a female, suggesting that these changes are a specific response to male-female courtship interactions. We supported our hypothesis that socially-responsive genes can function in behavior by showing that egghead (egh) expression, which increases during social interactions, is required for robust male-to-female courtship. We predict that analyzing additional socially-responsive genes will give us insight into genes and neural signaling pathways that influence reproductive and other behavioral interactions.


Subject(s)
Behavior, Animal , Drosophila melanogaster/genetics , Gene Expression Regulation , Sex Characteristics , Adipose Tissue/cytology , Adipose Tissue/metabolism , Animals , Brain/metabolism , Courtship , Drosophila Proteins/genetics , Drosophila melanogaster/physiology , Female , Genetic Loci/genetics , Male , Membrane Proteins/genetics , Neurons/cytology , Neurons/metabolism , Oligonucleotide Array Sequence Analysis , Polymerase Chain Reaction , Reproducibility of Results
16.
BMC Genomics ; 11: 558, 2010 Oct 11.
Article in English | MEDLINE | ID: mdl-20937114

ABSTRACT

BACKGROUND: Behavior is a complex process resulting from the integration of genetic and environmental information. Drosophila melanogaster rely on multiple sensory modalities for reproductive success, and mating causes physiological changes in both sexes that affect reproductive output or behavior. Some of these effects are likely mediated by changes in gene expression. Courtship and mating alter female transcript profiles, but it is not known how mating affects male gene expression. RESULTS: We used Drosophila genome arrays to identify changes in gene expression profiles that occur in mated male heads. Forty-seven genes differed between mated and control heads 2 hrs post mating. Many mating-responsive genes are highly expressed in non-neural head tissues, including an adipose tissue called the fat body. One fat body-enriched gene, female-specific independent of transformer (fit), is a downstream target of the somatic sex-determination hierarchy, a genetic pathway that regulates Drosophila reproductive behaviors as well as expression of some fat-expressed genes; three other mating-responsive loci are also downstream components of this pathway. Another mating-responsive gene expressed in fat, Juvenile hormone esterase (Jhe), is necessary for robust male courtship behavior and mating success. CONCLUSIONS: Our study demonstrates that mating causes changes in male head gene expression profiles and supports an increasing body of work implicating adipose signaling in behavior modulation. Since several mating-induced genes are sex-determination hierarchy target genes, additional mating-responsive loci may be downstream components of this pathway as well.


Subject(s)
Drosophila melanogaster/genetics , Gene Expression Regulation , Sexual Behavior, Animal , Adipose Tissue/cytology , Adipose Tissue/metabolism , Aging/metabolism , Animals , Brain/metabolism , Carboxylic Ester Hydrolases/metabolism , Courtship , Down-Regulation/genetics , Drosophila Proteins/genetics , Drosophila Proteins/metabolism , Drosophila melanogaster/enzymology , Fat Body/cytology , Fat Body/metabolism , Female , Genes, Insect/genetics , Head , Male , Oligonucleotide Array Sequence Analysis , Reproducibility of Results , Reproduction/genetics , Reverse Transcriptase Polymerase Chain Reaction , Up-Regulation/genetics
17.
Dev Dyn ; 236(2): 544-55, 2007 Feb.
Article in English | MEDLINE | ID: mdl-17131401

ABSTRACT

Genes encoding members of the p24 family of intracellular trafficking proteins are present throughout animal and plant lineages. However, very little is known about p24 developmental, spatial, or sex-specific expression patterns or how localized expression affects function. We investigated these problems in Drosophila melanogaster, which contains nine genes encoding p24 proteins. One of these genes, logjam (loj), is expressed in the adult female nervous system and ovaries and is essential for oviposition. Nervous system-specific expression of loj, but not ovary-specific expression, rescues the behavioral defect of mutants. The Loj protein localizes to punctate structures in the cellular cytoplasm. These structures colocalize with a marker specific to the intermediate compartment and cis-Golgi, consistent with experimental evidence from other systems suggesting that p24 proteins function in intracellular transport between the endoplasmic reticulum and Golgi. Our findings reveal that Drosophila p24 transcripts are developmentally and tissue-specifically expressed. CG31787 is male-specifically expressed gene that is present during the larval, pupal, and adult stages. Female CG9053 mRNA is limited to the head, whereas males express this gene widely. Together, our studies provide experimental evidence indicating that some p24 genes have sex-specific expression patterns and tissue- and sex-limited functions.


Subject(s)
Carrier Proteins/genetics , Drosophila melanogaster/embryology , Drosophila melanogaster/genetics , Gene Expression Profiling , Multigene Family/genetics , Animals , Central Nervous System/metabolism , DNA Primers , Drosophila Proteins/genetics , Drosophila Proteins/metabolism , Endoplasmic Reticulum/metabolism , Female , Golgi Apparatus/metabolism , Immunoblotting , In Situ Hybridization , Male , Microscopy, Fluorescence , Ovary/metabolism , Oviposition/genetics , Reverse Transcriptase Polymerase Chain Reaction , Sex Factors
18.
Cell Tissue Res ; 312(3): 265-74, 2003 Jun.
Article in English | MEDLINE | ID: mdl-12768408

ABSTRACT

Cocaine- and amphetamine-regulated transcript-immunoreactive (CART-IR) neurons and nerve fibers were abundant in the submucosal and myenteric plexuses of the guinea pig duodenum, ileum, cecum, proximal and distal colon. CART immunoreactivity was also observed in cell bodies and nerve fibers in the extrahepatic biliary tract. In the myenteric plexus, similar proportions (~20-25%) of neurons were CART-IR in all regions, with the exception of the cecum, where only 13% were CART-IR. In the submucosal plexus, CART-IR was detected in 35-50% of the neurons along the bowel with the exception of the proximal colon (~10%). Multiple label immunohistochemistry in the myenteric plexus of the ileum demonstrated that CART-IR neurons were also immunoreactive for choline acetyltransferase (83%), tachykinins (77%), calbindin (50%), nitric oxide synthase (20%), and/or vasoactive intestinal peptide (23%). In triple label studies, we found that ~8% of the CART-IR neurons were also immunoreactive for both choline acetyltransferase and nitric oxide synthase. CART immunoreactivity was not colocalized with calretinin, somatostatin, or serotonin. These results, combined with previous studies of chemical coding and projection patterns in the guinea pig ileum, indicate that at least four different classes of gut neurons in the myenteric plexus express CART peptide, including excitatory and inhibitory motor neurons projecting to the circular muscle, intrinsic primary afferent neurons, and a subset of descending interneurons. Because all CART-IR neurons in the submucosal plexus were also vasoactive intestinal peptide-IR, they are likely to include secretomotor/vasodilator neurons.


Subject(s)
Intestinal Mucosa/metabolism , Intestines/cytology , Nerve Tissue Proteins/metabolism , Neurons/metabolism , Animals , Colchicine/metabolism , Gallbladder/cytology , Gallbladder/innervation , Gallbladder/metabolism , Ganglia/cytology , Ganglia/metabolism , Guinea Pigs , Myenteric Plexus/cytology , Myenteric Plexus/metabolism , Neurons/cytology , Neurotransmitter Agents/metabolism , Sphincter of Oddi/cytology , Sphincter of Oddi/metabolism , Submucous Plexus/cytology , Submucous Plexus/metabolism
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