In vitro reactivation of latent equid herpesvirus-1 from CD5+/CD8+ leukocytes indirectly by IL-2 or chorionic gonadotrophin.
Abstract
IL-2 and equine chorionic gonadotrophin (eCG) initiated reactivation of equid herpesvirus-1 (EHV-1) from venous lymphocytes at a frequency of 1/10(-5). Indirect immunofluorescence showed that > 80% of virus-positive leukocytes were CD5+/CD8+ with the remaining 20% being CD5+/CD8-/CD4-. Cocultivation demonstrated that the reactivated virus was infectious. In addition, virus was reactivated in vitro from leukocytes of > 70% of horses by the mitogens phytohaemagglutinin (PHA) and pokeweed mitogen (PWM). Transfer of supernatants showed that IL-2 and eCG acted indirectly by causing the release of other mediators from adherent cells; these mediators then reactivated EHV-1 from T cells. Blocking experiments with anti-IL-2 showed that PWM and PHA acted via IL-2 but that eCG did not. This is the first clear definition of the lymphoid cells that harbour latent EHV-1 in vivo and correlates with current RT-PCR and in situ hybridization of latency-associated transcripts in lymphocytes. This method of reactivation in vitro can be used to detect horses carrying latent EHV-1 in vivo and also has the potential to dissect the sequence of events involved in reactivation in vitro.
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EHV-1 reactivates from CD8+ T lymphocytes upon mitogen stimulation in vitro.
“An in vitro study showed that EHV-1 reactivates from CD8+ T lymphocytes upon mitogen stimulation (e.g., phytohaemagglutin ad pokeweed mitogen) (Smith et al., 1998).”
From The Pathogenesis and Immune Evasive Mechanisms of Equine Herpesvirus Type 1 (2021) · cites this paper as Smith et al., 1998
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- Authors
- Smith, D. J., Iqbal, J., Edington, N., Purewal, A., & Hamblin, A. S.
- Affiliations
- Royal Veterinary College (GB)
- Venue
- Journal of General Virology
- Publisher
- Microbiology Society
- Published
- 1998-12-01
- Volume
- 79
- Issue
- 12
- Pages
- 2997-3004
- ISSN
- 0022-1317 (ISSN-L)
- 1465-2099
- OpenAlex
- W2105093420
- Cited by
- 51
- References
- 39
- Citations by year
- 2023: 1 · 2022: 1 · 2021: 3 · 2020: 3 · 2019: 1 · 2018: 4 · 2016: 3 · 2015: 1 · 2014: 1 · 2013: 7 · 2012: 1
- FWCI
- 1.74
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of General Virology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Epidemiology › Herpesvirus Infections and Treatments
- Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Virus Infections Studies
- Health Sciences › Medicine › Oncology › Viral-associated cancers and disorders
- Keywords
- equine herpesvirus 1, viral latency, interleukin-2, equine chorionic gonadotropin, phytohemagglutinin, pokeweed mitogen, horses, latency-associated transcript
- MeSH terms
- Animals, Cells, Cultured, Herpesvirus 1, Equid, Chorionic Gonadotropin, Horses, Humans, Interleukin-2, Rabbits, Virus Activation, Polymerase Chain Reaction, Virus Latency, CD8-Positive T-Lymphocytes, CD5 Antigens
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