Public Defence: Malin Holm Meyer-Myklestad
Cand.med. Malin Holm Meyer-Myklestad at Institute of Clinical Medicine will be defending the thesis “HIV-infected immunological nonresponders: A characterization of gut immunity and the effects of a probiotic supplement” for the degree of PhD (Philosophiae Doctor).
Photo: Ine Eriksen, UiO
Due to copyright reasons, an electronic copy of the thesis must be ordered from the faculty. In order for the faculty to have time to process the order, it must be received by the faculty no later than 2 days prior to the public defence. Orders received later than 2 days before the defence will not be processed. Inquiries regarding the thesis after the public defence must be addressed to the candidate.
Trial Lecture – time and place
See Trial Lecture.
- First opponent: Professor Nichole Klatt, University of Minnesota, USA
- Second opponent: Senior Consultant Piotr Nowak, Karolinska Institutet, Sweden
- Third member and chair of the evaluation committee: Associate Professor Jørgen Gravning, University of Oslo
Chair of the Defence
Professor Olav Dalgard, University of Oslo
Associate Professor Dag Henrik Reikvam, University of Oslo
Worldwide today, 38 million people live with HIV and in 2020 700.000 died of HIV related disease. HIV infects CD4 T cells and causes a gradual decline in these cells. Antiretroviral treatment (ART) will in most people reconstitute the CD4 T cells, and people living with HIV on ART have life expectancy comparable to uninfected people.
HIV-infected immunological nonresponders (INR) are people living with HIV who do not reconstitute their CD4 T cells on effective ART, and this group have increased risk of non-AIDS morbidity.
The aims of this thesis were to describe the role of the gastrointestinal mucosal barrier and microbiome in the insufficient gain of CD4 in INR and to assess if probiotic supplement could enhance gut immunity in INR.
INR had a lower number of CD4 T cells in colon, altered composition of mucosal CD4 T cells, more exhausted CD4 T cells in both the blood and gut as well as elevated markers of damage to the gastrointestinal barrier. There were no differences in the microbiome between INR and people with a sufficient response to ART.
Probiotics induced changes to the microbiome in ileum, but did not affect systemic CD4 T cell count. The use of probiotics was safe in INR.
Taken together; this work supports the importance of the gastrointestinal barrier and gut immunity in INR, which could be targeted with adjuvant treatment to ART.
Contact the research support staff.