The NASA Task Book

Ott, Mark Ph.D.	NASA Johnson Space Center
Oubre, Cherie Ph.D.	NASA Johnson Space Center
Nelman-Gonzalez, Marya B.A.	KBR/NASA Johnson Space Center
Mehta, Satish Ph.D.	KBR/NASA Johnson Space Center
Colorado, Audrie Ph.D.	KBR/NASA Johnson Space Center
Diak, Douglass M.	Aegis Aerospace/NASA Johnson Space Center
Gutierrez, Cody	JES Tech/NASA Johnson Space Center
Bustos-Lopez, Sara	University of Houston/NASA Johnson Space Center


Key Personnel Changes / Previous PI:	Douglass Diak, PhD has been added as Co-Investigator because of his expertise in flow cytometry. He replaced Stephanie Krieger on the investigation, who has moved on to a new department at NASA. Sara Bustos-Lopez and Cody Gutierrez have also joined the lab as laboratory technicians and have worked on the processing of blood samples for this project.

Project Information: Grant/Contract No. Directed Research

Responsible Center: NASA JSC Grant Monitor: Brocato, Becky Center Contact: becky.brocato@nasa.gov Unique ID: 14374	Solicitation / Funding Source: Directed Research Grant/Contract No.: Directed Research Project Type: Flight,Ground Flight Program: TechPort: No	No. of Post Docs: 0 No. of PhD Candidates: 0 No. of Master's Candidates: 0 No. of Bachelor's Candidates: 0	No. of PhD Degrees: 0 No. of Master's Degrees: 0 No. of Bachelor's Degrees: 0

Human Research Program Elements:	(1) HHC:Human Health Countermeasures

Human Research Program Risks:	(1) Immune:Risk of In Mission Impacts, Adverse Health Events or Long-Term Health Impacts due to Altered Immune Response (2) Microhost:Risk of Adverse Health Effects Due to Host-Microorganism Interactions

Human Research Program Gaps:	(1) IM-101:Evaluate the effects of deep-space radiation on immune dysfunction, as an additional hazard to the effects of psychophysiological stress and weightlessness. (2) IM-105:Identify immune biomarkers that correlate with known spaceflight-related immune dysfunction and immune outcomes, as a first step in designing in-flight monitoring paradigms. (3) Micro-101:Evaluate the effects of isolation, confinement and weightlessness on changes in the vehicle microbiome, the human microbiome, and microbial virulence. (4) Micro-201:Micro-201: Evaluate the contribution of changes in microbial numbers, types, and virulence on the likelihood and consequence of adverse health events (infection), during the mission.

Flight Assignment/Project Notes:	NOTE: End date changed to 12/30/2025 per T. Sirmons/HHC (Ed., 6/19/25). NOTE: End date changed to 04/30/2026 per T. Sirmons/HHC (Ed., 2/20/25).

Task Description:	Over the past 50 years, microorganisms have displayed unexpected responses relevant to infectious disease when grown in microgravity (and microgravity analogues), including changes in final cell concentration, biofilm production, stress resistance, antibiotic sensitivity, gene expression, and virulence. In parallel, astronaut studies have characterized a persistent spaceflight-induced dysregulation of the human immune system, consisting of altered leukocyte distribution, reductions in T and Natural Killer (NK) cell function, altered cytokine profiles, and reactivation of latent herpesviruses. Further, astronauts have some degree of clinical incidence, primarily infectious disease episodes, and atopic dermatitis. The impact of microgravity on host-pathogen interactions and potential for clinical disease remains understudied and poorly characterized. The goal of this study is to use spaceflight analogue conditions to define the relationship between altered virulence of medically-significant microorganisms aboard the International Space Station (ISS) and the immune response of the host, including astronaut immune cells. This information will provide critical understanding into the impact of microgravity on potential alterations of microbial virulence and associated infectious disease risk to crew health during spaceflight missions. Specific Aims: Specific Aim 1: Profile the synergistic relationship between spaceflight analogue-altered bacterial virulence characteristics and spaceflight analogue-altered immune cell function. Alterations in immune cell responses will be evaluated when human primary immune cells are challenged with pathogens in normal and spaceflight analogue growth conditions. Specific Aim 2: Profile antimicrobial efficacy for astronauts participating in spaceflight via challenge with spaceflight analogue cultured bacterial pathogens. Primary immune cells from astronauts will be profiled before, during, and post-flight to identify alterations in host response to pathogens in normal and spaceflight analogue conditions. This will be the first study to apply an integrated systematic approach to understand the relationship between spaceflight, immune cell function, and infectious disease risk for the crew. The results from this study will enhance the current infectious disease risk assessment for the crew, elucidate the relationship to clinical disease, and support future development and application of effective countermeasures for treatment and prevention.

Rationale for HRP Directed Research:	The immune research task aims to determine which microorganisms develop altered virulence when exposed to spaceflight conditions and understanding the synergistic effect of altered microbial virulence and dysregulated immunity on crew health risks for deep space missions. Insufficient time for solicitation: Continued delays in initiating the proposed study will continue to impact the schedule and decrease our likelihood of gaining the knowledge needed to close the risk. Note that the delay in this work may impact the Path to Risk Reduction (PRR) color change from yellow to green and put the studies outside of the window for use of the International Space Station (ISS). Two prior solicitations have been released (in 2009 and 2014) for ground-based proposals to understand microbial responses to simulated microgravity. Even though the prior solicitations were written clearly, the selected studies did not focus on identifying the microbial alterations that would gain the understanding needed to inform the risk, and they did not produce the needed ground-based investigations on mechanisms. The 2009 selection addresses collective changes of organisms within the human microbiome, and the 2014 selection addresses viral reactivation. The selected studies will provide information applicable to the gaps Micro-102 for Microbiome and Micro-201 for the viral reactivation study, but not Micro-202 as requested in the solicitation. Completion of the proposed work will provide clear evidence as to the operational applicability of these original microbial virulence data to a variety of microorganisms and will include measurements of host immune responses to microbial challenge. Access to Previous Crew Data: This proposed study will leverage previous microbiology operational and research data as well as immunology research data to provide a better understanding of impacts of microbial changes to the host and to determine the need for countermeasure evaluation as outlined in our joint PRR. Via the recent ‘Epstein Barr,’ ‘Integrated Immune,’ ‘Salivary Markers,’ and ‘Functional Immune’ investigations of astronaut immunocompetence during flight, and via collaborations with the Japan Aerospace Exploration Agency (JAXA) ‘Multi Omics’ and European Space Agency (ESA) ‘Immuno,’ ‘Immuno2,’ and ‘MoCISS’ ISS investigations, the Johnson Space Center (JSC) team has access to unique astronaut data. These data will be necessary to select assays that define crew alterations during flight, relevant for the current Host-Pathogen proposal. Also, for Aim 1, comparisons to previous crew findings, especially for repeat flyers, will be relevant to interpret the data in the context of crew health risks.

Research Impact/Earth Benefits:	Nothing to report.

Task Progress & Bibliography Information FY2024

Task Progress:

Over the past year, the Immunology and Microbiology laboratories at NASA Johnson Space Center have collaborated to process the astronaut subject samples to complete the last year of the flight portion of this study. This included the completion of four astronaut subjects' full mission sampling sets. Sample processing included innate and adaptive cell flow cytometry, as well as analysis of cytokine concentrations in the supernatant. Sample sets included twelve astronauts. The ground control segment of the study will take place during FY25, which involves parallel infections run under static and clinostat conditions. The acquired data sets over this 3-year study are now being analyzed to provide a comprehensive set of results and conclusions that will contribute to a more effective risk assessment for astronauts during spaceflight regarding this host-pathogen context.

Bibliography:

Description: (Last Updated: 05/15/2025)

Show Cumulative Bibliography


Abstracts for Journals and Proceedings	Diak DM, Gutierrez CL, Thornhill SG, Krieger S, Colorado A, Mehta SK, Nelman-Gonzalez M, Castro CL, Ott CM, Barrila J, Nickerson CA, and Crucian BE. "Microgravity influence on bacterial pathogen virulence and immune cell function – relevance for spaceflight infectious disease risk." 2023 Human Research Program Investigators' Workshop, Galveston, Texas, February 7-9, 2023. Poster. Abstracts. 2023 Human Research Program Investigators' Workshop, Galveston, Texas, February 7-9, 2023. , Feb-2023

Abstracts for Journals and Proceedings	Bustos-Lopez S, Diak DM, Gutierrez CL, Thornhill SG, Nelman-Gonzalez M, Mehta SK, Koroli S, Davis RR, Kang BY, Almengor A, Krieger S, Castro CL, Colorado A, Ott CM, Barrila J, Nickerson CA, and Crucian BE. "Influence of microgravity on bacterial pathogen virulence and immune cell function – relevance for infectious disease during spaceflight." 2024 Human Research Program Investigators' Workshop, Galveston, Texas, February 13-16, 2024. Poster. Abstracts. 2024 Human Research Program Investigators' Workshop, Galveston, Texas, February 13-16, 2024. , Feb-2024

Articles in Peer-reviewed Journals	Mehta SK, Suresh R, Brandt K, Diak DM, Smith SM, Zwart SR, Douglas G, Nelman-Gonzalez M, Clemett S, Brunstetter T, Crucian BE. "Immune system dysregulation preceding a case of laboratory-confirmed zoster/dermatitis on board the International Space Station." J Allergy Clin Immunol Glob. 2024 May;3(2):100244. http://dx.doi.org/10.1016/j.jacig.2024.100244 ; PMID: 38577482; PMCID: PMC10992860 , May-2024

Articles in Peer-reviewed Journals	Buchheim J-I, Feuerecker M, Balsamo M, Vukich M, Van Walleghem M, Tabury K, Quintens R, Vermeesen R, Baselet B, Baatout S, Rattenbacher B, Antunes I, Ngo-Anh TJ, Crucian B, Choukér A. "Monitoring functional immune responses with a cytokine release assay: ISS flight hardware design and experimental protocol for whole blood cultures executed under microgravity conditions." Front Physiol. 2024 Jan 15;14:1322852. https://doi.org/10.3389/fphys.2023.1322852 ; PMID: 38288353; PMCID: PMC10823428 , Jan-2024

Articles in Peer-reviewed Journals	Krittanawong C, Singh NK, Scheuring RA, Urquieta E, Bershad EM, Macaulay TR, Kaplin S, Dunn C, Kry SF, Russomano T, Shepanek M, Stowe RP, Kirkpatrick AW, Broderick TJ, Sibonga JD, Lee AG, Crucian BE. "Human health during space travel: State-of-the-art review." Cells. 2022 Dec 23;12(1):40. Review. https://www.mdpi.com/2073-4409/12/1/40 ; PMID: 36611835; PMCID: PMC9818606 , Dec-2022

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Project Title: Spaceflight-Induced Immune System Dysregulation and Microgravity-Associated Alterations in Microbial Virulence – Infectious Disease Risk for Astronauts

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Fiscal Year: FY 2022
Division: Human Research
Research Discipline/Element:
HRP HHC:Human Health Countermeasures

Start Date: 10/01/2020
End Date: 09/30/2024
Task Last Updated: 10/01/2021

Download Task Book report in PDF pdf

Principal Investigator/Affiliation: Crucian, Brian Ph.D. / NASA Johnson Space Center

Address:

Immunology, SK4
2101 NASA Pkwy
Houston , TX 77058-3607

Email: brian.crucian-1@nasa.gov
Phone: 281-483-7061
Congressional District: 36
Web:

Organization Type: NASA CENTER
Organization Name: NASA Johnson Space Center
Joint Agency:
Comments:

Co-Investigator(s)
Affiliation:

Ott, Mark Ph.D.	NASA Johnson Space Center
Oubre, Cherie Ph.D.	NASA Johnson Space Center
Krieger, Stephanie M.S.	KBR/NASA Johnson Space Center
Nelman-Gonzalez, Marya B.A.	KBR/NASA Johnson Space Center
Mehta, Satish Ph.D.	KBR/NASA Johnson Space Center
Colorado, Audrie Ph.D.	KBR/NASA Johnson Space Center


Key Personnel Changes / Previous PI:	October 2021 report: Audrie Colorado, Ph.D. was added as Co-Investigator because of her expertise in preparation and growth of bacterial microbes. She replaced George Makedonas, Ph.D. on the investigation, who departed NASA service.

Project Information: Grant/Contract No. Directed Research

Responsible Center: NASA JSC Grant Monitor: Brocato, Becky Center Contact: becky.brocato@nasa.gov Unique ID: 14374	Solicitation / Funding Source: Directed Research Grant/Contract No.: Directed Research Project Type: Ground Flight Program: TechPort: No	No. of Post Docs: 0 No. of PhD Candidates: 0 No. of Master's Candidates: 0 No. of Bachelor's Candidates: 0	No. of PhD Degrees: 0 No. of Master's Degrees: 0 No. of Bachelor's Degrees: 0

Human Research Program Elements:	(1) HHC:Human Health Countermeasures

Human Research Program Risks:	(1) Immune:Risk of In Mission Impacts, Adverse Health Events or Long-Term Health Impacts due to Altered Immune Response (2) Microhost:Risk of Adverse Health Effects Due to Host-Microorganism Interactions

Human Research Program Gaps:	(1) IM-101:Evaluate the effects of deep-space radiation on immune dysfunction, as an additional hazard to the effects of psychophysiological stress and weightlessness. (2) IM-105:Identify immune biomarkers that correlate with known spaceflight-related immune dysfunction and immune outcomes, as a first step in designing in-flight monitoring paradigms. (3) Micro-101:Evaluate the effects of isolation, confinement and weightlessness on changes in the vehicle microbiome, the human microbiome, and microbial virulence. (4) Micro-201:Micro-201: Evaluate the contribution of changes in microbial numbers, types, and virulence on the likelihood and consequence of adverse health events (infection), during the mission.

Task Description:	Over the past 50 years, microorganisms have displayed unexpected responses relevant to infectious disease when grown in microgravity (and microgravity analogues), including changes in final cell concentration, biofilm production, stress resistance, antibiotic sensitivity, gene expression, and virulence. In parallel, astronaut studies have characterized a persistent spaceflight-induced dysregulation of the human immune system, consisting of altered leukocyte distribution, reductions in T and Natural Killer (NK) cell function, altered cytokine profiles, and reactivation of latent herpesviruses. Further, astronauts have some degree of clinical incidence, primarily infectious disease episodes, and atopic dermatitis. The impact of microgravity on host-pathogen interactions and potential for clinical disease remains understudied and poorly characterized. The goal of this study is to use spaceflight analogue conditions to define the relationship between altered virulence of medically-significant microorganisms aboard the International Space Station (ISS) and the immune response of the host, including astronaut immune cells. This information will provide critical understanding into the impact of microgravity on potential alterations of microbial virulence and associated infectious disease risk to crew health during spaceflight missions. Specific Aims: Specific Aim 1: Profile the synergistic relationship between spaceflight analogue-altered bacterial virulence characteristics and spaceflight analogue-altered immune cell function. Alterations in immune cell responses will be evaluated when human primary immune cells are challenged with pathogens in normal and spaceflight analogue growth conditions. Specific Aim 2: Profile antimicrobial efficacy for astronauts participating in spaceflight via challenge with spaceflight analogue cultured bacterial pathogens. Primary immune cells from astronauts will be profiled before, during, and post-flight to identify alterations in host response to pathogens in normal and spaceflight analogue conditions. This will be the first study to apply an integrated systematic approach to understand the relationship between spaceflight, immune cell function, and infectious disease risk for the crew. The results from this study will enhance the current infectious disease risk assessment for the crew, elucidate the relationship to clinical disease, and support future development and application of effective countermeasures for treatment and prevention.

Rationale for HRP Directed Research:	The immune research task aims to determine which microorganisms develop altered virulence when exposed to spaceflight conditions and understanding the synergistic effect of altered microbial virulence and dysregulated immunity on crew health risks for deep space missions. Insufficient time for solicitation: Continued delays in initiating the proposed study will continue to impact the schedule and decrease our likelihood of gaining the knowledge needed to close the risk. Note that the delay in this work may impact the Path to Risk Reduction (PRR) color change from yellow to green and put the studies outside of the window for use of the International Space Station (ISS). Two prior solicitations have been released (in 2009 and 2014) for ground-based proposals to understand microbial responses to simulated microgravity. Even though the prior solicitations were written clearly, the selected studies did not focus on identifying the microbial alterations that would gain the understanding needed to inform the risk, and they did not produce the needed ground-based investigations on mechanisms. The 2009 selection addresses collective changes of organisms within the human microbiome, and the 2014 selection addresses viral reactivation. The selected studies will provide information applicable to the gaps Micro-102 for Microbiome and Micro-201 for the viral reactivation study, but not Micro-202 as requested in the solicitation. Completion of the proposed work will provide clear evidence as to the operational applicability of these original microbial virulence data to a variety of microorganisms and will include measurements of host immune responses to microbial challenge. Access to Previous Crew Data: This proposed study will leverage previous microbiology operational and research data as well as immunology research data to provide a better understanding of impacts of microbial changes to the host and to determine the need for countermeasure evaluation as outlined in our joint PRR. Via the recent ‘Epstein Barr,’ ‘Integrated Immune,’ ‘Salivary Markers,’ and ‘Functional Immune’ investigations of astronaut immunocompetence during flight, and via collaborations with the Japan Aerospace Exploration Agency (JAXA) ‘Multi Omics’ and European Space Agency (ESA) ‘Immuno,’ ‘Immuno2,’ and ‘MoCISS’ ISS investigations, the Johnson Space Center (JSC) team has access to unique astronaut data. These data will be necessary to select assays that define crew alterations during flight, relevant for the current Host-Pathogen proposal. Also, for Aim 1, comparisons to previous crew findings, especially for repeat flyers, will be relevant to interpret the data in the context of crew health risks.

Research Impact/Earth Benefits:

Task Progress & Bibliography Information FY2022

Task Progress:

Over the past 50 years, microorganisms have displayed unexpected responses relevant to infectious disease when grown in microgravity (and microgravity analogues), including changes in final cell concentration, biofilm production, stress resistance, antibiotic sensitivity, gene expression, and virulence. In parallel, astronaut studies have characterized a persistent spaceflight-induced dysregulation of the human immune system, consisting of altered leukocyte distribution, reductions in T and Natural Killer (NK) cell function, altered cytokine profiles, and reactivation of latent herpesviruses. Further, astronauts have some degree of clinical incidence, primarily infectious disease episodes and atopic dermatitis. The impact of microgravity on host-pathogen interactions and potential for clinical disease remains understudied and poorly characterized.

The goal of this study is to use spaceflight analogue conditions to define the relationship between altered virulence of medically-significant microorganisms aboard the International Space Station (ISS) and the immune response of the host, including astronaut immune cells. This information will provide critical understanding into the impact of microgravity on potential alterations of microbial virulence and associated infectious disease risk to crew health during spaceflight missions.

Specific Aims: Aim 1: Profile the synergistic relationship between spaceflight analogue-altered bacterial virulence characteristics and spaceflight analogue-altered immune cell function. Alterations in immune cell responses will be evaluated when human primary immune cells are challenged with pathogens in normal and spaceflight analogue growth conditions. Aim 2: Profile antimicrobial efficacy for astronauts participating in spaceflight via challenge with spaceflight analogue cultured bacterial pathogens. Primary immune cells from astronauts will be profiled before, during, and post-flight to identify alterations in host response to pathogens in normal and spaceflight analogue conditions.

This will be the first study to apply an integrated systematic approach to understand the relationship between spaceflight, immune cell function, and infectious disease risk for the crew. The results from this study will enhance the current infectious disease risk assessment for the crew, elucidate the relationship to clinical disease, and support future development and application of effective countermeasures for treatment and prevention.

In 2021, Immunology and Microbiology laboratory personnel worked diligently to optimize the culture conditions and flow cytometry panels prior to beginning work on crew samples. This included several trial runs testing different microbial growth conditions, cellular surface markers, and preparations for analysis by confocal and fluorescent microscopy. The trial runs included testing of 4 bacteria: Burkholderia cepacia, Salmonella enteritidis, Pseudomonas aeruginosa, and Enterohemorrhagic E. coli. The bacteria were cultured with both whole blood and peripheral blood mononuclear cells.

The IRB (Institutional Review Board) protocol for this study was submitted and approved in March 2020. Informed consent briefings for crew members began in December 2020. To date, five crew members have enrolled in this study and the first two sample collections (L-180 and L-90) have occurred for two of those individuals. Additionally, two crew members are scheduled for their first sample collection (L-180) in early October 2021.

Bibliography:

Description: (Last Updated: 05/15/2025)

Show Cumulative Bibliography

None in FY 2022

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Project Title: Spaceflight-Induced Immune System Dysregulation and Microgravity-Associated Alterations in Microbial Virulence – Infectious Disease Risk for Astronauts

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Images:

Fiscal Year: FY 2021
Division: Human Research
Research Discipline/Element:
HRP HHC:Human Health Countermeasures

Start Date: 10/01/2020
End Date: 09/30/2024
Task Last Updated: 04/30/2021

Download Task Book report in PDF pdf

Principal Investigator/Affiliation: Crucian, Brian Ph.D. / NASA Johnson Space Center

Address:

Immunology, SK4
2101 NASA Pkwy
Houston , TX 77058-3607

Email: brian.crucian-1@nasa.gov
Phone: 281-483-7061
Congressional District: 36
Web:

Organization Type: NASA CENTER
Organization Name: NASA Johnson Space Center
Joint Agency:
Comments:

Co-Investigator(s)
Affiliation:

Ott, Mark Ph.D.	NASA Johnson Space Center
Oubre, Cherie Ph.D.	NASA Johnson Space Center
Krieger, Stephanie M.S.	KBR/NASA Johnson Space Center
Nelman-Gonzalez, Marya B.A.	KBR/NASA Johnson Space Center
Makedonas, George Ph.D.	JES Tech/NASA Johnson Space Center
Mehta, Satish Ph.D.	KBR/NASA Johnson Space Center

Project Information: Grant/Contract No. Directed Research

Responsible Center: NASA JSC Grant Monitor: Brocato, Becky Center Contact: becky.brocato@nasa.gov Unique ID: 14374	Solicitation / Funding Source: Directed Research Grant/Contract No.: Directed Research Project Type: Ground Flight Program: TechPort: No	No. of Post Docs: No. of PhD Candidates: No. of Master's Candidates: No. of Bachelor's Candidates:	No. of PhD Degrees: No. of Master's Degrees: No. of Bachelor's Degrees:

Human Research Program Elements:	(1) HHC:Human Health Countermeasures

Human Research Program Risks:	(1) Immune:Risk of In Mission Impacts, Adverse Health Events or Long-Term Health Impacts due to Altered Immune Response (2) Microhost:Risk of Adverse Health Effects Due to Host-Microorganism Interactions

Human Research Program Gaps:	(1) IM-101:Evaluate the effects of deep-space radiation on immune dysfunction, as an additional hazard to the effects of psychophysiological stress and weightlessness. (2) IM-105:Identify immune biomarkers that correlate with known spaceflight-related immune dysfunction and immune outcomes, as a first step in designing in-flight monitoring paradigms. (3) Micro-101:Evaluate the effects of isolation, confinement and weightlessness on changes in the vehicle microbiome, the human microbiome, and microbial virulence. (4) Micro-201:Micro-201: Evaluate the contribution of changes in microbial numbers, types, and virulence on the likelihood and consequence of adverse health events (infection), during the mission.

Task Description:	Over the past 50 years, microorganisms have displayed unexpected responses relevant to infectious disease when grown in microgravity (and microgravity analogues), including changes in final cell concentration, biofilm production, stress resistance, antibiotic sensitivity, gene expression, and virulence. In parallel, astronaut studies have characterized a persistent spaceflight-induced dysregulation of the human immune system; consisting of altered leukocyte distribution, reductions in T and Natural Killer (NK) cell function, altered cytokine profiles, and reactivation of latent herpesviruses. Further, astronauts have some degree of clinical incidence, primarily infectious disease episodes, and atopic dermatitis. The impact of microgravity on host-pathogen interactions and potential for clinical disease remains understudied and poorly characterized. The goal of this study is to use spaceflight analogue conditions to define the relationship between altered virulence of medically-significant microorganisms aboard the International Space Station (ISS) and the immune response of the host, including astronaut immune cells. This information will provide critical understanding into the impact of microgravity on potential alterations of microbial virulence and associated infectious disease risk to crew health during spaceflight missions. Specific Aims: Specific Aim 1: Profile the synergistic relationship between spaceflight analogue-altered bacterial virulence characteristics and spaceflight analogue-altered immune cell function. Alterations in immune cell responses will be evaluated when human primary immune cells are challenged with pathogens in normal and spaceflight analogue growth conditions. Specific Aim 2: Profile antimicrobial efficacy for astronauts participating in spaceflight via challenge with spaceflight analogue cultured bacterial pathogens. Primary immune cells from astronauts will be profiled before, during, and post-flight to identify alterations in host response to pathogens in normal and spaceflight analogue conditions. This will be the first study to apply an integrated systematic approach to understand the relationship between spaceflight, immune cell function, and infectious disease risk for the crew. The results from this study will enhance the current infectious disease risk assessment for the crew, elucidate the relationship to clinical disease, and support future development and application of effective countermeasures for treatment and prevention.

Rationale for HRP Directed Research:	The immune research task aims to determine which microorganisms develop altered virulence when exposed to spaceflight conditions and understanding the synergistic effect of altered microbial virulence and dysregulated immunity on crew health risks for deep space missions. Insufficient time for solicitation: Continued delays in initiating the proposed study will continue to impact the schedule and decrease our likelihood of gaining the knowledge needed to close the risk. Note that the delay in this work may impact the Path to Risk Reduction (PRR) color change from yellow to green and put the studies outside of the window for use of the International Space Station (ISS). Two prior solicitations have been released (in 2009 and 2014) for ground-based proposals to understand microbial responses to simulated microgravity. Even though the prior solicitations were written clearly, the selected studies did not focus on identifying the microbial alterations that would gain the understanding needed to inform the risk, and they did not produce the needed ground-based investigations on mechanisms. The 2009 selection addresses collective changes of organisms within the human microbiome, and the 2014 selection addresses viral reactivation. The selected studies will provide information applicable to the gaps Micro-102 for Microbiome and Micro-201 for the viral reactivation study, but not Micro-202 as requested in the solicitation. Completion of the proposed work will provide clear evidence as to the operational applicability of these original microbial virulence data to a variety of microorganisms and will include measurements of host immune responses to microbial challenge. Access to Previous Crew Data: This proposed study will leverage previous microbiology operational and research data as well as immunology research data to provide a better understanding of impacts of microbial changes to the host and to determine the need for countermeasure evaluation as outlined in our joint PRR. Via the recent ‘Epstein Barr,’ ‘Integrated Immune,’ ‘Salivary Markers,’ and ‘Functional Immune’ investigations of astronaut immunocompetence during flight, and via collaborations with the Japan Aerospace Exploration Agency (JAXA) ‘Multi Omics’ and European Space Agency (ESA) ‘Immuno,’ ‘Immuno2,’ and ‘MoCISS’ ISS investigations, the Johnson Space Center (JSC) team has access to unique astronaut data. These data will be necessary to select assays that define crew alterations during flight, relevant for the current Host-Pathogen proposal. Also, for Aim 1, comparisons to previous crew findings, especially for repeat flyers, will be relevant to interpret the data in the context of crew health risks.

Research Impact/Earth Benefits:

Task Progress & Bibliography Information FY2021

Task Progress:

New project for FY2021.

Bibliography:

Description: (Last Updated: 05/15/2025)

Show Cumulative Bibliography

None in FY 2021

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