Publications by authors named "Tara Steffen"

Nesfatin-1, derived from the nucleobindin 2 (NUCB2) precursor, is a potent anorexigenic peptide that was discovered in 2006. Since its identification in the hypothalamus, it has been shown to have wide ranging actions within and outside of the central nervous system. One of these actions is the regulation of inflammation, which could potentially be exploited therapeutically in the context of obesity-associated inflammation in adipose tissue.

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Introduction: Vaccination is the most effective mechanism to prevent severe COVID-19. However, breakthrough infections and subsequent transmission of SARS-CoV-2 remain a significant problem. Intranasal vaccination has the potential to be more effective in preventing disease and limiting transmission between individuals as it induces potent responses at mucosal sites.

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  • The National Cancer Institute established the Serological Sciences Network (SeroNet) in October 2020 to study immune responses to COVID-19 and enhance serological testing technologies.
  • SeroNet involves 25 research institutions collaborating on COVID-19 serological assays, including developing and sharing assay procedures and harmonization plans.
  • A structured approach was taken to calibrate various serological assays to reference standards, resulting in a wide range of developed assays that will allow for consistent reporting and future data comparisons across studies.
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  • - In October 2020, the National Cancer Institute launched the Serological Sciences Network (SeroNet) to research the immune response to COVID-19 and improve serological testing through collaboration among 25 research institutions.
  • - A detailed survey was conducted to gather information on various COVID-19 serological assays, while a protocol was established to calibrate these assays to reference standards for better data comparison.
  • - SeroNet institutions developed multiple COVID-19 serological assay methods and standardized calibration protocols, which will enhance the accuracy and comparability of future studies on SARS-CoV-2 and vaccine responses.
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  • - Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) causes COVID-19, a respiratory disease with varying severity, and several risk factors for severe illness include age, male sex, and conditions like diabetes and obesity.
  • - Recent advancements in treatments such as corticosteroids have now become standard care for severe COVID-19 patients, but the molecular effects of these treatments on the immune response to the virus are still not fully understood.
  • - A study analyzed immune responses in hospitalized diabetic males with obesity, revealing that severe COVID-19 is linked to strong antibody responses and inflammation, whereas patients treated with steroids had reduced inflammation and indicators of cell death.
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The closely related flaviviruses, dengue and Zika, cause significant human disease throughout the world. While cross-reactive antibodies have been demonstrated to have the capacity to potentiate disease or mediate protection during flavivirus infection, the mechanisms responsible for this dichotomy are still poorly understood. To understand how the human polyclonal antibody response can protect against, and potentiate the disease in the context of dengue and Zika virus infection we used intravenous hyperimmunoglobulin (IVIG) preparations in a mouse model of the disease.

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A rise in adiposity in the United States has resulted in more than 70% of adults being overweight or obese, and global obesity rates have tripled since 1975. Following the 2009 H1N1 pandemic, obesity was characterized as a risk factor that could predict severe infection outcomes to viral infection. Amidst the SARS-CoV-2 pandemic, obesity has remained a significant risk factor for severe viral disease as obese patients have a higher likelihood for developing severe symptoms and requiring hospitalization.

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The 2015/2016 Zika virus epidemic in South and Central America left the scientific community urgently trying to understand the factors that contribute to Zika virus pathogenesis. Because multiple other flaviviruses are endemic in areas where Zika virus emerged, it is hypothesized that a key to understanding Zika virus disease severity is to study Zika virus infection in the context of prior flavivirus exposure. Human and animal studies have highlighted the idea that having been previously exposed to a different flavivirus may modulate the immune response to Zika virus.

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The novel human coronavirus, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has caused a pandemic. Critical to the rapid evaluation of vaccines and antivirals against SARS-CoV-2 is the development of tractable animal models to understand the adaptive immune response to the virus. To this end, the use of common laboratory strains of mice is hindered by significant divergence of the angiotensin-converting enzyme 2 (ACE2), which is the receptor required for entry of SARS-CoV-2.

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The Flaviviridae family of RNA viruses includes numerous human disease-causing pathogens that largely are increasing in prevalence due to continual climate change, rising population sizes and improved ease of global travel [...

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The novel human coronavirus, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has caused a pandemic resulting in nearly 20 million infections across the globe, as of August 2020. Critical to the rapid evaluation of vaccines and antivirals is the development of tractable animal models of infection. The use of common laboratory strains of mice to this end is hindered by significant divergence of the angiotensin-converting enzyme 2 (ACE2), which is the receptor required for entry of SARS-CoV-2.

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Zika virus (ZIKV) is a significant public health concern due to the pathogen's ability to be transmitted by either mosquito bite or sexual transmission, allowing spread to occur throughout the world. The potential consequences of ZIKV infection to human health, specifically neonates, necessitates the development of a safe and effective Zika virus vaccine. Here, we developed an intranasal Zika vaccine based upon the replication-deficient human adenovirus serotype 5 (hAd5) expressing ZIKV pre-membrane and envelope protein (hAd5-ZKV).

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