Jon Lendrum

Jon Lendrum

Greater Minneapolis-St. Paul Area
2K followers 500+ connections

About

Experienced regulatory professional dedicated to the medical device industry. Holds a…

Activity

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Experience

  • Medtronic Graphic
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    Plymouth, Minnesota, United States

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    Eden Prairie, Minnesota

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    Minneapolis, Minnesota

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    Greater Minneapolis-St. Paul Area

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    Greater Minneapolis-St. Paul Area

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    Greater Minneapolis-St. Paul Area

Education

Licenses & Certifications

Volunteer Experience

Publications

  • Sleep and the gut microbiome: antibiotic-induced depletion of the gut microbiota reduces nocturnal sleep in mice

    bioRxiv

    Several bacterial cell wall components such as peptidoglycan and muramyl peptide are potent inducers of mammalian slow-wave sleep when exogenously administered to freely behaving animals. It has been proposed that the native gut microflora may serve as a quasi-endogenous pool of somnogenic bacterial cell wall products given their quantity and close proximity to the intestinal portal. This proposal suggests that deliberate manipulation of the host's intestinal flora may elicit changes in host…

    Several bacterial cell wall components such as peptidoglycan and muramyl peptide are potent inducers of mammalian slow-wave sleep when exogenously administered to freely behaving animals. It has been proposed that the native gut microflora may serve as a quasi-endogenous pool of somnogenic bacterial cell wall products given their quantity and close proximity to the intestinal portal. This proposal suggests that deliberate manipulation of the host's intestinal flora may elicit changes in host sleep behavior. To test this possibility, we evaluated 24 h of sleep-wake behavior after depleting the gut microbiota with a 14 d broad-spectrum antibiotic regimen containing high doses of ampicillin, metronidazole, neomycin, and vancomycin. High-throughput sequencing of the bacterial 16S rDNA gene was used to confirm depletion of fecal bacteria and sleep-wake vigilance states were determined using videosomnography techniques based on previously established behavioral criteria shown to highly correlate with standard polysomnography-based methods. We found that antibiotic-induced depletion of the gut microbiota reduced nocturnal sleep, but not diurnal sleep. Likewise, antibiotic-treated mice showed increased nocturnal locomotor activity, but not diurnal locomotor activity. Taken together, these results support a link between the gut microbiome and nocturnal sleep and locomotor physiology in adult mice. Additionally, our findings indicate that antibiotics may be insomnogenic via their ability to diminish gut-derived bacterial somnogens. Given that antibiotics are among the most commonly prescribed drugs in human medicine, these findings have important implications for clinical practice with respect to prolonged antibiotic therapy, insomnia, and other idiopathic sleep-wake and circadian-rhythm disorders affecting an estimated 50-70 million people in the United States alone.

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  • Depletion of murine microbiota with broad‐spectrum antibiotics alters intestinal motility, secretion, and mucosal barrier function

    The Federation of American Society for Experimental Biology Journal

    The commensal microbiota in the gut coevolved with the mammalian host and is essential for many host physiological processes. Alterations in the composition of gut microbiota seem to be a pathogenic component of functional gastrointestinal disorders. The aim of this study is to investigate if a state of antibiotics‐induced intestinal dysbiosis is able to modify intestinal motility, secretion, and mucosal barrier function. C57BL/6 mice received a broad‐spectrum antibiotic cocktail (ampicillin…

    The commensal microbiota in the gut coevolved with the mammalian host and is essential for many host physiological processes. Alterations in the composition of gut microbiota seem to be a pathogenic component of functional gastrointestinal disorders. The aim of this study is to investigate if a state of antibiotics‐induced intestinal dysbiosis is able to modify intestinal motility, secretion, and mucosal barrier function. C57BL/6 mice received a broad‐spectrum antibiotic cocktail (ampicillin 25mg/kg, vancomycin 10mg/kg, neomycin 25 mg/kg, and metronidazole 25 mg/kg) by oral gavage once a day for two weeks. Gastrointestinal transit was measured using a charcoal meal method. Ussing chamber techniques were used to assess colonic mucosal ion secretion and transepithelial electrical resistance (TER). Intestinal permeability to macromolecules was assessed by the flux of horseradish peroxidase (HRP, 44kD) from mucosa to serosa side of the colonic mucosa/submucosa preparations. Two weeks of antibiotics treatment delayed gastrointestinal transit. Colonic baseline ion secretion was increased in antibiotics‐treated mice. Antibiotics treatment also caused a dramatic increase in intestinal permeability, which was indicated by a significant reduction of TER and an increase in HRP flux from mucosa to serosa side of the colon. The results of this study suggest that depletion of intestinal microbiota with broad‐spectrum antiobiotics reduces gastrointestinal motility, enhances colonic ion secretion, and impairs mucosal barrier function and may contribute to functional gastrointestinal disorders.

    Support or Funding Information: National Institutes of Health (NIH) R15 DK097460‐01A1 (SL) and UW‐L Undergraduate Research Grant (JL)

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Courses

  • Due Diligence for Regulatory Professionals

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  • Global Regulatory Strategy

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  • Human Anatomy and Physiology

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  • Immunology and Virology

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  • Medical Device Regulations: China, Japan, Taiwan, South Korea, Singapore

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  • Medical Device Risk Management - ISO 14971

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  • Medical Device Total Product Lifecycle

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  • Organic Chemistry

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  • Pathogenic Bacteriology

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  • Project Management for Regulatory Professionals

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  • Regulatory Due Diligence for Product Development

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Honors & Awards

  • Biomedical Science 2016 Senior of the Year

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  • Dean's Distinguished Research Fellowship

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  • Undergraduate Research and Creativity Grant

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  • Sears Best of Blue Sales Representative

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    Awarded for achieving over 150% in projected sales, above parity in Protection Agreements, and above 40% in Accessories Sales

  • Washburn Senior High School Class of 1959 Scholarship

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Languages

  • English

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Organizations

  • Medical Alley Association

    Member

    - Present
  • AdvaMed

    Member

    - Present
  • American Society for Quality

    Member

    - Present
  • MedTech Europe

    Member

    - Present
  • Regulatory Affairs Professionals Society (RAPS)

    Member

    - Present
  • American Academy of Sleep Medicine

    Member

    - Present
  • American Physiological Society

    Member

    - Present

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