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  1. Article ; Online: Examining the Potential of Vitamin C Supplementation in Tissue-Engineered Equine Superficial Digital Flexor Tendon Constructs.

    Mienaltowski, Michael J / Callahan, Mitchell / Gonzales, Nicole L / Wong, Angelique

    International journal of molecular sciences

    2023  Volume 24, Issue 23

    Abstract: Because equine tendinopathies are slow to heal and often recur, therapeutic strategies are being considered that aid tendon repair. Given the success of utilizing vitamin C to promote tenogenesis in other species, we hypothesized that vitamin C ... ...

    Abstract Because equine tendinopathies are slow to heal and often recur, therapeutic strategies are being considered that aid tendon repair. Given the success of utilizing vitamin C to promote tenogenesis in other species, we hypothesized that vitamin C supplementation would produce dose-dependent improvements in the tenogenic properties of tendon proper (TP) and peritenon (PERI) cells of the equine superficial digital flexor tendon (SDFT). Equine TP- and PERI-progenitor-cell-seeded fibrin three-dimensional constructs were supplemented with four concentrations of vitamin C. The gene expression profiles of the constructs were assessed with 3'-Tag-Seq and real-time quantitative polymerase chain reaction (RT-qPCR); collagen content and fibril ultrastructure were also analyzed. Moreover, cells were challenged with dexamethasone to determine the levels of cytoprotection afforded by vitamin C. Expression profiling demonstrated that vitamin C had an anti-inflammatory effect on TP and PERI cell constructs. Moreover, vitamin C supplementation mitigated the degenerative pathways seen in tendinopathy and increased collagen content in tendon constructs. When challenged with dexamethasone in two-dimensional culture, vitamin C had a cytoprotective effect for TP cells but not necessarily for PERI cells. Future studies will explore the effects of vitamin C on these cells during inflammation and within the tendon niche in vivo.
    MeSH term(s) Animals ; Horses ; Tendons/metabolism ; Collagen/metabolism ; Tissue Engineering/methods ; Tendinopathy/drug therapy ; Tendinopathy/metabolism ; Ascorbic Acid/pharmacology ; Ascorbic Acid/metabolism ; Dexamethasone/pharmacology ; Dexamethasone/metabolism
    Chemical Substances Collagen (9007-34-5) ; Ascorbic Acid (PQ6CK8PD0R) ; Dexamethasone (7S5I7G3JQL)
    Language English
    Publishing date 2023-12-04
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms242317098
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Health Status and Health Care Access Among Lesbian, Gay, and Bisexual Adults in the US, 2013 to 2018.

    Liu, Michael / Sandhu, Sahil / Reisner, Sari L / Gonzales, Gilbert / Keuroghlian, Alex S

    JAMA internal medicine

    2023  Volume 183, Issue 4, Page(s) 380–383

    MeSH term(s) Female ; Adult ; Humans ; Sexual and Gender Minorities ; Homosexuality, Female ; Bisexuality ; Health Status ; Health Services Accessibility
    Language English
    Publishing date 2023-02-20
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2699338-7
    ISSN 2168-6114 ; 2168-6106
    ISSN (online) 2168-6114
    ISSN 2168-6106
    DOI 10.1001/jamainternmed.2022.6523
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Feasibility and Preliminary Efficacy of American Elderberry Juice for Improving Cognition and Inflammation in Patients with Mild Cognitive Impairment.

    Curtis, Ashley F / Musich, Madison / Costa, Amy N / Gonzales, Joshua / Gonzales, Hyeri / Ferguson, Bradley J / Kille, Briana / Thomas, Andrew L / Wei, Xing / Liu, Pei / Greenlief, C Michael / Shenker, Joel I / Beversdorf, David Q

    International journal of molecular sciences

    2024  Volume 25, Issue 8

    Abstract: Despite data showing that nutritional interventions high in antioxidant/anti-inflammatory properties (anthocyanin-rich foods, such as blueberries/elderberries) may decrease risk of memory loss and cognitive decline, evidence for such effects in mild ... ...

    Abstract Despite data showing that nutritional interventions high in antioxidant/anti-inflammatory properties (anthocyanin-rich foods, such as blueberries/elderberries) may decrease risk of memory loss and cognitive decline, evidence for such effects in mild cognitive impairment (MCI) is limited. This study examined preliminary effects of American elderberry (Sambucus nigra subsp. canadensis) juice on cognition and inflammatory markers in patients with MCI. In a randomized, double-blind, placebo-controlled trial, patients with MCI (
    MeSH term(s) Humans ; Cognitive Dysfunction ; Male ; Aged ; Female ; Fruit and Vegetable Juices ; Cognition/drug effects ; Inflammation/blood ; Double-Blind Method ; Sambucus/chemistry ; Aged, 80 and over ; Biomarkers/blood ; Feasibility Studies ; Sambucus nigra/chemistry
    Chemical Substances Biomarkers
    Language English
    Publishing date 2024-04-15
    Publishing country Switzerland
    Document type Journal Article ; Randomized Controlled Trial
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms25084352
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Fusion of myofibre branches is a physiological feature of healthy human skeletal muscle regeneration.

    Højfeldt, Grith / Sorenson, Trent / Gonzales, Alana / Kjaer, Michael / Andersen, Jesper L / Mackey, Abigail L

    Skeletal muscle

    2023  Volume 13, Issue 1, Page(s) 13

    Abstract: Background: The occurrence of hyperplasia, through myofibre splitting, remains a widely debated phenomenon. Structural alterations and fibre typing of skeletal muscle fibres, as seen during regeneration and in certain muscle diseases, can be challenging ...

    Abstract Background: The occurrence of hyperplasia, through myofibre splitting, remains a widely debated phenomenon. Structural alterations and fibre typing of skeletal muscle fibres, as seen during regeneration and in certain muscle diseases, can be challenging to interpret. Neuromuscular electrical stimulation can induce myofibre necrosis followed by changes in spatial and temporal cellular processes. Thirty days following electrical stimulation, remnants of regeneration can be seen in the myofibre and its basement membrane as the presence of small myofibres and encroachment of sarcolemma and basement membrane (suggestive of myofibre branching/splitting). The purpose of this study was to investigate myofibre branching and fibre type in a systematic manner in human skeletal muscle undergoing adult regenerative myogenesis.
    Methods: Electrical stimulation was used to induce myofibre necrosis to the vastus lateralis muscle of one leg in 5 young healthy males. Muscle tissue samples were collected from the stimulated leg 30 days later and from the control leg for comparison. Biopsies were sectioned and stained for dystrophin and laminin to label the sarcolemma and basement membrane, respectively, as well as ATPase, and antibodies against types I and II myosin, and embryonic and neonatal myosin. Myofibre branches were followed through 22 serial Sects. (264 μm). Single fibres and tissue blocks were examined by confocal and electron microscopy, respectively.
    Results: Regular branching of small myofibre segments was observed (median length 144 μm), most of which were observed to fuse further along the parent fibre. Central nuclei were frequently observed at the point of branching/fusion. The branch commonly presented with a more immature profile (nestin + , neonatal myosin + , disorganised myofilaments) than the parent myofibre, together suggesting fusion of the branch, rather than splitting. Of the 210 regenerating muscle fibres evaluated, 99.5% were type II fibres, indicating preferential damage to type II fibres with our protocol. Furthermore, these fibres demonstrated 7 different stages of "fibre-type" profiles.
    Conclusions: By studying the regenerating tissue 30 days later with a range of microscopy techniques, we find that so-called myofibre branching or splitting is more likely to be fusion of myotubes and is therefore explained by incomplete regeneration after a necrosis-inducing event.
    MeSH term(s) Male ; Adult ; Infant, Newborn ; Humans ; Muscle Fibers, Skeletal/pathology ; Muscle, Skeletal/pathology ; Regeneration/physiology ; Myosins ; Necrosis/pathology
    Chemical Substances Myosins (EC 3.6.4.1)
    Language English
    Publishing date 2023-08-12
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2595637-1
    ISSN 2044-5040 ; 2044-5040
    ISSN (online) 2044-5040
    ISSN 2044-5040
    DOI 10.1186/s13395-023-00322-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Examining the Potential of Vitamin C Supplementation in Tissue-Engineered Equine Superficial Digital Flexor Tendon Constructs

    Michael J. Mienaltowski / Mitchell Callahan / Nicole L. Gonzales / Angelique Wong

    International Journal of Molecular Sciences, Vol 24, Iss 23, p

    2023  Volume 17098

    Abstract: Because equine tendinopathies are slow to heal and often recur, therapeutic strategies are being considered that aid tendon repair. Given the success of utilizing vitamin C to promote tenogenesis in other species, we hypothesized that vitamin C ... ...

    Abstract Because equine tendinopathies are slow to heal and often recur, therapeutic strategies are being considered that aid tendon repair. Given the success of utilizing vitamin C to promote tenogenesis in other species, we hypothesized that vitamin C supplementation would produce dose-dependent improvements in the tenogenic properties of tendon proper (TP) and peritenon (PERI) cells of the equine superficial digital flexor tendon (SDFT). Equine TP- and PERI-progenitor-cell-seeded fibrin three-dimensional constructs were supplemented with four concentrations of vitamin C. The gene expression profiles of the constructs were assessed with 3′-Tag-Seq and real-time quantitative polymerase chain reaction (RT-qPCR); collagen content and fibril ultrastructure were also analyzed. Moreover, cells were challenged with dexamethasone to determine the levels of cytoprotection afforded by vitamin C. Expression profiling demonstrated that vitamin C had an anti-inflammatory effect on TP and PERI cell constructs. Moreover, vitamin C supplementation mitigated the degenerative pathways seen in tendinopathy and increased collagen content in tendon constructs. When challenged with dexamethasone in two-dimensional culture, vitamin C had a cytoprotective effect for TP cells but not necessarily for PERI cells. Future studies will explore the effects of vitamin C on these cells during inflammation and within the tendon niche in vivo.
    Keywords equine ; tendon ; peritenon ; vitamin C ; three-dimensional construct ; Biology (General) ; QH301-705.5 ; Chemistry ; QD1-999
    Subject code 610
    Language English
    Publishing date 2023-12-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Flourishing and the Prioritization of Workplace Elements in General Surgery Residents.

    Nguyen, Elaine T / Berler, Michael H / Gonzales, Paul A / Greenberg, Anya L / Lebares, Carter C

    The Journal of surgical research

    2023  Volume 291, Page(s) 488–495

    Abstract: Introduction: To explore and begin to operationalize workplace elements that influence general surgery (GS) resident wellbeing. Tailoring workplace wellbeing interventions is critical to their success. Occupational science has revealed that a person- ... ...

    Abstract Introduction: To explore and begin to operationalize workplace elements that influence general surgery (GS) resident wellbeing. Tailoring workplace wellbeing interventions is critical to their success. Occupational science has revealed that a person-centered approach to identifying positive and negative workplace influences can inform tailoring while accounting for individual differences. To our knowledge, this approach has not been applied to the surgical training environment.
    Methods: A national sample of GS residents from 16 Accreditation Council for Graduate Medical Education training programs ranked the importance of workplace elements via an anonymous survey. Latent profile analysis was performed to identify shared patterns of workplace element prioritization and their relation to levels of flourishing, a measure of global wellbeing.
    Results: GS trainee respondents (n = 300, 34% response rate - average for studies with this sample population) expressed a hierarchy of workplace element importance which differed by gender and race. "Skills to manage stress" and "a team you feel a part of" were prioritized higher by non-males than males. Residents of color and residents underrepresented in medicine, respectively, prioritized "recognition of work/effort" and "skills to manage stress" more than White and overrepresented in medicine residents. Flourishing prevalence varied by 40% with small differences in the specific profile of workplace element prioritization.
    Conclusions: Differences in prioritization of workplace elements reveal subtle but important differences that may guide the design of wellbeing interventions for different populations within surgery.
    MeSH term(s) Humans ; Internship and Residency ; Workplace ; Education, Medical, Graduate ; Surveys and Questionnaires ; Emotions ; General Surgery/education
    Language English
    Publishing date 2023-08-02
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 80170-7
    ISSN 1095-8673 ; 0022-4804
    ISSN (online) 1095-8673
    ISSN 0022-4804
    DOI 10.1016/j.jss.2023.06.039
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Operationalizing the Culture of Burnout and Well-Being: Multicenter Study of Value Congruence and Flourishing in General Surgery Residency.

    Cevallos, Jenny R / Gonzales, Paul Adam / Berler, Michael H / Greenberg, Anya L / Lebares, Carter C

    Journal of the American College of Surgeons

    2023  Volume 237, Issue 3, Page(s) 397–407

    Abstract: Background: Value congruence (VC) is the degree of alignment between worker and workplace values and is strongly associated with reduced job strain and retention. Within general surgery residency, the impact of VC and how to operationalize it to improve ...

    Abstract Background: Value congruence (VC) is the degree of alignment between worker and workplace values and is strongly associated with reduced job strain and retention. Within general surgery residency, the impact of VC and how to operationalize it to improve workplace well-being remain unclear.
    Study design: This 2-part mixed-methods study comprised 2 surveys of US general surgery residents and qualitative interviews with program directors. In Part 1, January 2021, mixed-level surgical residents from 16 ACGME-accredited general surgery residency programs participated in survey #1. This survey was used to identify shared or conflicting perspectives on VC concerning well-being initiatives and resources. In April 2021, interviews from 8 institutions were conducted with 9 program directors or their proxies. In Part 2, May to June 2022, a similar cohort of surgical residents participated in survey #2. Unadjusted logistic and linear regression models were used in this survey to assess the association between VC and individual-level global well-being (ie flourishing), respectively.
    Results: In survey #1 (N = 300, 34% response rate), lack of VC was an emergent theme with subthemes of inaccessibility, inconsiderateness, inauthenticity, and insufficiency regarding well-being resources. Program directors expressed variable awareness of and alignment with these perceptions. In survey #2 (N = 251, 31% response rate), higher VC was significantly associated with flourishing (odds ratio 1.91, 95% CI 1.44 to 2.52, p < 0.001).
    Conclusions: Exploring the perceived lack of VC within general surgery residency reveals an important cultural variable for optimizing well-being and suggests open dialogue as a first step toward positive change. Future work to identify where and how institutional actions diminish perceived VC is warranted.
    MeSH term(s) Humans ; United States ; Internship and Residency ; Surveys and Questionnaires ; Burnout, Professional/prevention & control ; General Surgery/education
    Language English
    Publishing date 2023-05-31
    Publishing country United States
    Document type Multicenter Study ; Journal Article
    ZDB-ID 1181115-8
    ISSN 1879-1190 ; 1072-7515
    ISSN (online) 1879-1190
    ISSN 1072-7515
    DOI 10.1097/XCS.0000000000000775
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Basic Structure, Physiology, and Biochemistry of Connective Tissues and Extracellular Matrix Collagens.

    Mienaltowski, Michael J / Gonzales, Nicole L / Beall, Jessica M / Pechanec, Monica Y

    Advances in experimental medicine and biology

    2021  Volume 1348, Page(s) 5–43

    Abstract: The physiology of connective tissues like tendons and ligaments is highly dependent upon the collagens and other such extracellular matrix molecules hierarchically organized within the tissues. By dry weight, connective tissues are mostly composed of ... ...

    Abstract The physiology of connective tissues like tendons and ligaments is highly dependent upon the collagens and other such extracellular matrix molecules hierarchically organized within the tissues. By dry weight, connective tissues are mostly composed of fibrillar collagens. However, several other forms of collagens play essential roles in the regulation of fibrillar collagen organization and assembly, in the establishment of basement membrane networks that provide support for vasculature for connective tissues, and in the formation of extensive filamentous networks that allow for cell-extracellular matrix interactions as well as maintain connective tissue integrity. The structures and functions of these collagens are discussed in this chapter. Furthermore, collagen synthesis is a multi-step process that includes gene transcription, translation, post-translational modifications within the cell, triple helix formation, extracellular secretion, extracellular modifications, and then fibril assembly, fibril modifications, and fiber formation. Each step of collagen synthesis and fibril assembly is highly dependent upon the biochemical structure of the collagen molecules created and how they are modified in the cases of development and maturation. Likewise, when the biochemical structures of collagens or are compromised or these molecules are deficient in the tissues - in developmental diseases, degenerative conditions, or injuries - then the ultimate form and function of the connective tissues are impaired. In this chapter, we also review how biochemistry plays a role in each of the processes involved in collagen synthesis and assembly, and we describe differences seen by anatomical location and region within tendons. Moreover, we discuss how the structures of the molecules, fibrils, and fibers contribute to connective tissue physiology in health, and in pathology with injury and repair.
    MeSH term(s) Collagen ; Connective Tissue ; Extracellular Matrix ; Fibrillar Collagens ; Tendons
    Chemical Substances Fibrillar Collagens ; Collagen (9007-34-5)
    Language English
    Publishing date 2021-11-22
    Publishing country United States
    Document type Journal Article
    ISSN 2214-8019 ; 0065-2598
    ISSN (online) 2214-8019
    ISSN 0065-2598
    DOI 10.1007/978-3-030-80614-9_2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Short-Term total and wildfire fine particulate matter exposure and work loss in California.

    Meng, Ying-Ying / Yu, Yu / Al-Hamdan, Mohammad Z / Marlier, Miriam E / Wilkins, Joseph L / Garcia-Gonzales, Diane / Chen, Xiao / Jerrett, Michael

    Environment international

    2023  Volume 178, Page(s) 108045

    Abstract: Background: Few studies investigated the impact of particulate matter (PM: Methods: We included 44,544 adult respondents in the workforce from 2015 to 2018 California Health Interview Survey data. Daily total PM: Results: About 1.69% (weighted ... ...

    Abstract Background: Few studies investigated the impact of particulate matter (PM
    Methods: We included 44,544 adult respondents in the workforce from 2015 to 2018 California Health Interview Survey data. Daily total PM
    Results: About 1.69% (weighted percentage) of adult respondents reported work loss in the week before the survey interview. The odds ratio of work loss was 1.45 (odds ratio [OR] = 1.45, 95% confidence interval [CI]: 1.03, 2.03) when a 2-week average of daily total PM
    Conclusions: Our findings suggest that short-term ambient PM
    MeSH term(s) Humans ; Air Pollutants/adverse effects ; Air Pollution ; California ; Environmental Exposure/adverse effects ; Logistic Models ; Particulate Matter/adverse effects ; Particulate Matter/analysis ; Smoke/adverse effects ; Wildfires ; Adult
    Chemical Substances Air Pollutants ; Particulate Matter ; Smoke
    Language English
    Publishing date 2023-06-17
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 554791-x
    ISSN 1873-6750 ; 0160-4120
    ISSN (online) 1873-6750
    ISSN 0160-4120
    DOI 10.1016/j.envint.2023.108045
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Rethinking the techno vagina: a case series of patient complications following vaginal laser treatment for atrophy.

    Gordon, Catherine / Gonzales, Savanah / Krychman, Michael L

    Menopause (New York, N.Y.)

    2019  Volume 26, Issue 4, Page(s) 423–427

    Abstract: Objective: The treatment of genitourinary syndrome of menopause (GSM) includes prescription hormone therapy, nonhormonal over-the-counter products, and most recently, laser treatment. Although the Food and Drug Administration has cleared fractional ... ...

    Abstract Objective: The treatment of genitourinary syndrome of menopause (GSM) includes prescription hormone therapy, nonhormonal over-the-counter products, and most recently, laser treatment. Although the Food and Drug Administration has cleared fractional carbon dioxide (CO2) laser for a variety of dermatologic and gynecologic indications, lasers have not to date, been approved for use for vulvar/vaginal atrophy, or sexual dysfunction.
    Methods: Four case studies that were referred to a tertiary sexual medicine center regarding laser treatment complications for GSM are reported. Patient data were Health Insurance Portability and Accountability Act of 1996 protected and informed consent was obtained by all patients.
    Results: Four cases are presented, which demonstrate complications after completion of three consecutive laser treatments for GSM. Case 1 is a 65-year-old woman with GSM and moderate vaginal stenosis who had two vaginal wall lacerations after resumption of intercourse. Case 2 is a 61-year-old woman who had persistent dyspareunia following vaginal laser treatments. Case 3 is a 68-year-old woman who reported worsening dyspareunia and had a fibrous band mid vagina that impinged on the canal. Case 4 is a 55-year-old woman who complained of dyspareunia and insertional pain, after her laser. Assessment and follow-up treatment are presented.
    Conclusions: Laser therapy for the vagina shows excellent promise for the treatment of GSM in some women; however, complications such as fibrosis, scarring, agglutination, and penetration injury have been documented. Food and Drug Administration-approved products for GSM should be considered frontline treatments until long-term, prospective, randomized, sham-controlled trials are conducted that confirm efficacy and safety for device treatments.
    MeSH term(s) Aged ; Atrophy/surgery ; Cicatrix/etiology ; Dyspareunia/etiology ; Dyspareunia/surgery ; Female ; Fibrosis/etiology ; Humans ; Lasers, Gas/adverse effects ; Middle Aged ; Vagina/pathology ; Vagina/surgery
    Language English
    Publishing date 2019-01-14
    Publishing country United States
    Document type Case Reports ; Journal Article
    ZDB-ID 1205262-0
    ISSN 1530-0374 ; 1072-3714
    ISSN (online) 1530-0374
    ISSN 1072-3714
    DOI 10.1097/GME.0000000000001293
    Database MEDical Literature Analysis and Retrieval System OnLINE

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