Sharon Lewin

Last updated

Sharon Ruth Lewin
Professor Sharon Lewin.jpg
Lewin in November 2017
Born
Melbourne, Australia
Alma mater Monash University
Known forHIV persistence and latency, HIV/HBV co-infection, COVID-19
SpouseRobert Milstein [1]
Awards
  • Peter Wills Medal (2015)
  • Officer of the Order of Australia (2019)
  • Robert C. Gallo Award for Scientific Excellence and Leadership in Medical Virology (2020)
  • Medal for Outstanding Female Researcher (2022)
Scientific career
FieldsMedicine, immunology, V\virology
InstitutionsThe Peter Doherty Institute for Infection and Immunity, University of Melbourne and Royal Melbourne Hospital
Monash University, Department of Infectious Diseases
Alfred Hospital
Burnet Institute

Sharon Ruth Lewin AO , FAA , FRACP, FAHMS is an Australian physician who is the inaugural Director of The Peter Doherty Institute for Infection and Immunity (Doherty Institute). She is also a Professor of Medicine at The University of Melbourne, a National Health and Medical Research Council (NHMRC) Practitioner Fellow, Director of the Cumming Global Centre for Pandemic Therapeutics, and President of the International AIDS Society (IAS).

Contents

Research and accomplishments

Lewin began her research career just as an antiretroviral treatment emerged for people living with HIV.[ citation needed ] Drawn to study HIV because of its global challenge, along with the complex social issues, Lewin's research interests have developed from questions arising during the clinical care of people living with HIV. Detecting, quantifying and potentially reactivating latent HIV is a central theme of Lewin's research, which spans basic virology, cellular immunology and clinical research. Her research laboratory is run together with immunologist and clinician Paul Cameron.[ citation needed ]

While completing her postdoctoral training with David Ho at the Aaron Diamond AIDS Research Centre, Lewin developed a highly sensitive PCR method to detect unspliced HIV RNA, an early product of viral transcription, in people receiving antiretroviral drugs. [2] Lewin's laboratory has developed models of HIV latency which are used to further tease out the mechanisms involved, and to assess the impact of latency reversal agents.[ citation needed ] Lewin's lab has shown that triggering the CCR7 receptor on resting CD4 T cells can induce latency, [3] acting through the activation of the cellular cytoskeleton, particularly actin remodelling. [4] This chemokine-induced latency model has been used in a comprehensive comparison of in vitro models for evaluating latency reversal agents. [5] Lewin's laboratory has also described the role of myeloid dendritic cells [6] and other antigen-presenting cells [7] in establishing HIV latency.

Lewin's team have made contributions to the knowledge of the HIV reservoir during antiretroviral treatment. This includes studies of naive CD4 T cells, where longitudinal and cross-sectional studies have shown that both CD31+ and CD31- naive CD4 T cells contribute to the ongoing HIV reservoir [8] and that HIV DNA is preferentially found in CD4 T cells expressing the chemokine receptors CXCR3 and CCR6. [9] Lewin's group has also studied immune reconstitution after antiretroviral treatment begins, exposing some of the factors associated with faster reconstitution [10] and has demonstrated a link between immune reconstitution and variants in the IL-7R gene. [11] [12]

Lewin's research has elucidated some of the basic immunology of Hepatitis B infection alone [13] and in co-infection with HIV. [14] Ongoing research is providing a deeper understanding of the clinical consequences of co-infection with Hepatitis B and HIV, both in Australian participants [15] [16] and through a long-standing collaboration with Thai researchers. [17] [18] [19] [20]

Lewin's clinical research efforts have focussed on potential HIV cure strategies, particularly those using the epigenetic modifiers including histone deacetylase inhibitors (HDACis). [21] [22] In vitro experiments showed that HDACis such as entinostat, [23] metacept-1 and -3 [24] could activate latent HIV in primary T cells. Following a sabbatical working with Christine Katlama and Brigitte Autran at the Hopital Pitié-Salpêtrière and Université Pierre et Marie Curie (UPMC), Paris, Lewin began to focus more on moving potential cure strategies into clinical trials. [25] Lewin's lab conducted the first multi-dose proof-of-concept HDACi trial in HIV positive participants, administering vorinostat daily over a 14-day period and assessing safety and impact on HIV transcription and reservoirs. [26] The trial and follow-on study [27] showed that while vorinostat was safe and able to increase HIV transcription in most participants, it did not reduce the HIV reservoir. [26] A dose-escalation study conducted in Melbourne, Australia and San Francisco, California, USA of the anti-alcohol compound Disulfiram also showed the ability to increase levels of cell-associated unspliced HIV RNA. [28] Both vorinostat and Disulfiram are now being investigated as part of a combination approach to latency activation ('kick' or 'tickle') followed by a second intervention to remove cells harbouring reactivated virus ('kill' or 'tease').

Lewin gave the opening plenary at the International AIDS Conference in Vienna in 2010.[ citation needed ] Lewin was local co-chair for the International AIDS Conference (AIDS 2014) in Melbourne, a member of WHO and UNAIDS strategic advisory groups and lead co-author of the 2016 International AIDS Society global scientific strategy to achieve an HIV cure. [29] Lewin is a founding council member of the Academy of Health and Medical Sciences, elected member of the Governing Council of the International AIDS Society representing the Asia Pacific region, she became President of the International AIDS Society in 2022 for a two-year tenure, [30] member of the council of the National Health and Medical Research Council (NHMRC) of Australia and chairs the Health Translation Advisory Committee. She chairs the Ministerial Advisory Committee on Blood Borne Viruses and Sexually Transmitted Infections, the peak advisory group to the Minister of Health of Australia.[ citation needed ]

Awards and honours

Related Research Articles

<span class="mw-page-title-main">HIV</span> Human retrovirus, cause of AIDS

The human immunodeficiency viruses (HIV) are two species of Lentivirus that infect humans. Over time, they cause acquired immunodeficiency syndrome (AIDS), a condition in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive. Without treatment, the average survival time after infection with HIV is estimated to be 9 to 11 years, depending on the HIV subtype.

The management of HIV/AIDS normally includes the use of multiple antiretroviral drugs as a strategy to control HIV infection. There are several classes of antiretroviral agents that act on different stages of the HIV life-cycle. The use of multiple drugs that act on different viral targets is known as highly active antiretroviral therapy (HAART). HAART decreases the patient's total burden of HIV, maintains function of the immune system, and prevents opportunistic infections that often lead to death. HAART also prevents the transmission of HIV between serodiscordant same-sex and opposite-sex partners so long as the HIV-positive partner maintains an undetectable viral load.

The spread of HIV/AIDS has affected millions of people worldwide; AIDS is considered a pandemic. The World Health Organization (WHO) estimated that in 2016 there were 36.7 million people worldwide living with HIV/AIDS, with 1.8 million new HIV infections per year and 1 million deaths due to AIDS. Misconceptions about HIV and AIDS arise from several different sources, from simple ignorance and misunderstandings about scientific knowledge regarding HIV infections and the cause of AIDS to misinformation propagated by individuals and groups with ideological stances that deny a causative relationship between HIV infection and the development of AIDS. Below is a list and explanations of some common misconceptions and their rebuttals.

<span class="mw-page-title-main">Lamivudine</span> Chemical compound

Lamivudine, commonly called 3TC, is an antiretroviral medication used to prevent and treat HIV/AIDS. It is also used to treat chronic hepatitis B when other options are not possible. It is effective against both HIV-1 and HIV-2. It is typically used in combination with other antiretrovirals such as zidovudine, dolutegravir, and abacavir. Lamivudine may be included as part of post-exposure prevention in those who have been potentially exposed to HIV. Lamivudine is taken by mouth as a liquid or tablet.

HIV-associated neurocognitive disorders (HAND) are neurological disorders associated with HIV infection and AIDS. It is a syndrome of progressive deterioration of memory, cognition, behavior, and motor function in HIV-infected individuals during the late stages of the disease, when immunodeficiency is severe. HAND may include neurological disorders of various severity. HIV-associated neurocognitive disorders are associated with a metabolic encephalopathy induced by HIV infection and fueled by immune activation of macrophages and microglia. These cells are actively infected with HIV and secrete neurotoxins of both host and viral origin. The essential features of HIV-associated dementia (HAD) are disabling cognitive impairment accompanied by motor dysfunction, speech problems and behavioral change. Cognitive impairment is characterised by mental slowness, trouble with memory and poor concentration. Motor symptoms include a loss of fine motor control leading to clumsiness, poor balance and tremors. Behavioral changes may include apathy, lethargy and diminished emotional responses and spontaneity. Histopathologically, it is identified by the infiltration of monocytes and macrophages into the central nervous system (CNS), gliosis, pallor of myelin sheaths, abnormalities of dendritic processes and neuronal loss.

Virus latency is the ability of a pathogenic virus to lie dormant within a cell, denoted as the lysogenic part of the viral life cycle. A latent viral infection is a type of persistent viral infection which is distinguished from a chronic viral infection. Latency is the phase in certain viruses' life cycles in which, after initial infection, proliferation of virus particles ceases. However, the viral genome is not eradicated. The virus can reactivate and begin producing large amounts of viral progeny without the host becoming reinfected by new outside virus, and stays within the host indefinitely.

<span class="mw-page-title-main">HIV/AIDS</span> Spectrum of conditions caused by HIV infection

HIV is a retrovirus that attacks the immune system. It can be managed with treatment. Without treatment it can lead to a spectrum of conditions including AIDS.

Human Immunodeficiency Virus (HIV) and Hepatitis C Virus (HCV) co-infection is a multi-faceted, chronic condition that significantly impacts public health. According to the World Health Organization (WHO), 2 to 15% of those infected with HIV are also affected by HCV, increasing their risk of morbidity and mortality due to accelerated liver disease. The burden of co-infection is especially high in certain high-risk groups, such as intravenous drug users and men who have sex with men. These individuals who are HIV-positive are commonly co-infected with HCV due to shared routes of transmission including, but not limited to, exposure to HIV-positive blood, sexual intercourse, and passage of the Hepatitis C virus from mother to infant during childbirth.

Vorinostat (rINN), also known as suberoylanilide hydroxamic acid, is a member of a larger class of compounds that inhibit histone deacetylases (HDAC). Histone deacetylase inhibitors (HDI) have a broad spectrum of epigenetic activities.

CD4 immunoadhesin is a recombinant fusion protein consisting of a combination of CD4 and the fragment crystallizable region, similarly known as immunoglobulin. It belongs to the antibody (Ig) gene family. CD4 is a surface receptor for human immunodeficiency virus (HIV). The CD4 immunoadhesin molecular fusion allow the protein to possess key functions from each independent subunit. The CD4 specific properties include the gp120-binding and HIV-blocking capabilities. Properties specific to immunoglobulin are the long plasma half-life and Fc receptor binding. The properties of the protein means that it has potential to be used in AIDS therapy as of 2017. Specifically, CD4 immunoadhesin plays a role in antibody-dependent cell-mediated cytotoxicity (ADCC) towards HIV-infected cells. While natural anti-gp120 antibodies exhibit a response towards uninfected CD4-expressing cells that have a soluble gp120 bound to the CD4 on the cell surface, CD4 immunoadhesin, however, will not exhibit a response. One of the most relevant of these possibilities is its ability to cross the placenta.

Long-term nonprogressors (LTNPs), are individuals infected with HIV, who maintain a CD4 count greater than 500 without antiretroviral therapy with a detectable viral load. Many of these patients have been HIV positive for 30 years without progressing to the point of needing to take medication in order not to develop AIDS. They have been the subject of a great deal of research, since an understanding of their ability to control HIV infection may lead to the development of immune therapies or a therapeutic vaccine. The classification "Long-term non-progressor" is not permanent, because some patients in this category have gone on to develop AIDS.

Diffuse infiltrative lymphocytosis syndrome (DILS) is a rare multi-system complication of HIV believed to occur secondary to an abnormal persistence of the initial CD8+ T cell expansion that regularly occurs in an HIV infection. This persistent CD8+ T cell expansion occurs in the setting of a low CD4+/CD8+ T cell ratio and ultimately invades and destroys tissues and organs resulting in the various complications of DILS. DILS classically presents with bilateral salivary gland enlargement (parotitis), cervical lymphadenopathy, and sicca symptoms such as xerophthalmia and xerostomia, but it may also involve the lungs, nervous system, kidneys, liver, digestive tract, and muscles. Once suspected, current diagnostic workups include (1) confirming HIV infection, (2) confirming six or greater months of characteristic signs and symptoms, (3) confirming organ infiltration by CD8+ T cells, and (4) exclusion of other autoimmune conditions. Once the diagnosis of DILS is confirmed, management includes highly active antiretroviral therapy (HAART) and as-needed steroids. With proper treatment, the overall prognosis of DILS is favorable.

AntiViral-HyperActivation Limiting Therapeutics (AV-HALTs) are an investigational class of antiretroviral drugs used to treat Human Immunodeficiency Virus (HIV) infection. Unlike other antiretroviral agents given to reduce viral replication, AV-HALTs are single or combination drugs designed to reduce the rate of viral replication while, at the same time, also directly reducing the state of immune system hyperactivation now believed to drive the loss of CD4+ T helper cells leading to disease progression and Acquired Immunodeficiency Syndrome (AIDS).

<span class="mw-page-title-main">Pathophysiology of HIV/AIDS</span>

HIV is commonly transmitted via unprotected sexual activity, blood transfusions, hypodermic needles, and from mother to child. Upon acquisition of the virus, the virus replicates inside and kills T helper cells, which are required for almost all adaptive immune responses. There is an initial period of influenza-like illness, and then a latent, asymptomatic phase. When the CD4 lymphocyte count falls below 200 cells/ml of blood, the HIV host has progressed to AIDS, a condition characterized by deficiency in cell-mediated immunity and the resulting increased susceptibility to opportunistic infections and certain forms of cancer.

<span class="mw-page-title-main">Signs and symptoms of HIV/AIDS</span>

The stages of HIV infection are acute infection, latency, and AIDS. Acute infection lasts for several weeks and may include symptoms such as fever, swollen lymph nodes, inflammation of the throat, rash, muscle pain, malaise, and mouth and esophageal sores. The latency stage involves few or no symptoms and can last anywhere from two weeks to twenty years or more, depending on the individual. AIDS, the final stage of HIV infection, is defined by low CD4+ T cell counts, various opportunistic infections, cancers, and other conditions.

The Berlin patient is an anonymous person from Berlin, Germany, who was described in 1998 as exhibiting prolonged "post-treatment control" of HIV viral load after HIV treatments were interrupted.

<span class="mw-page-title-main">HIV/AIDS research</span> Field of immunology research

HIV/AIDS research includes all medical research that attempts to prevent, treat, or cure HIV/AIDS, as well as fundamental research about the nature of HIV as an infectious agent and AIDS as the disease caused by HIV.

The co-epidemic of tuberculosis (TB) and human immunodeficiency virus (HIV) is one of the major global health challenges in the present time. The World Health Organization (WHO) reports 9.2 million new cases of TB in 2006 of whom 7.7% were HIV-infected. Tuberculosis is the most common contagious infection in HIV-Immunocompromised patients leading to death. These diseases act in combination as HIV drives a decline in immunity while tuberculosis progresses due to defective immune status. This condition becomes more severe in case of multi-drug (MDRTB) and extensively drug resistant TB (XDRTB), which are difficult to treat and contribute to increased mortality. Tuberculosis can occur at any stage of HIV infection. The risk and severity of tuberculosis increases soon after infection with HIV. A study on gold miners of South Africa revealed that the risk of TB was doubled during the first year after HIV seroconversion. Although tuberculosis can be a relatively early manifestation of HIV infection, it is important to note that the risk of tuberculosis progresses as the CD4 cell count decreases along with the progression of HIV infection. The risk of TB generally remains high in HIV-infected patients, remaining above the background risk of the general population even with effective immune reconstitution and high CD4 cell counts with antiretroviral therapy.

Harriet Mayanja-Kizza, MBChB, MMed, MSc, FACP, is a Ugandan physician, researcher, and academic administrator. She is the former Dean of Makerere University School of Medicine, the oldest medical school in East Africa, established in 1924.

Human Immunodeficiency Virus (HIV) has the capability to enter a latent stage of infection where it exists as a dormant provirus in CD4+ T-cells. Most latently infected cells are resting memory T cells, however a small fraction of latently infected cells isolated from HIV patients are naive CD4 T cells.

References

  1. Monash University Distinguished Alumni Sharon Lewin
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  3. Saleh, Suha; Solomon, Ajantha; Wightman, Fiona; Xhilaga, Miranda; Cameron, Paul U.; Lewin, Sharon R. (15 December 2007). "CCR7 ligands CCL19 and CCL21 increase permissiveness of resting memory CD4+ T cells to HIV-1 infection: a novel model of HIV-1 latency". Blood. 110 (13): 4161–4164. doi: 10.1182/blood-2007-06-097907 . ISSN   0006-4971. PMID   17881634.
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  5. Spina, Celsa A.; Anderson, Jenny; Archin, Nancie M.; Bosque, Alberto; Chan, Jonathan; Famiglietti, Marylinda; Greene, Warner C.; Kashuba, Angela; Lewin, Sharon R. (26 December 2013). "An In-Depth Comparison of Latent HIV-1 Reactivation in Multiple Cell Model Systems and Resting CD4+ T Cells from Aviremic Patients". PLOS Pathogens. 9 (12): e1003834. doi: 10.1371/journal.ppat.1003834 . ISSN   1553-7374. PMC   3873446 . PMID   24385908.
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  16. Audsley, Jennifer; Robson, Christopher; Aitchison, Stacey; Matthews, Gail V.; Iser, David; Sasadeusz, Joe; Lewin, Sharon R. (1 January 2016). "Liver Fibrosis Regression Measured by Transient Elastography in Human Immunodeficiency Virus (HIV)-Hepatitis B Virus (HBV)-Coinfected Individuals on Long-Term HBV-Active Combination Antiretroviral Therapy". Open Forum Infectious Diseases. 3 (1): ofw035. doi:10.1093/ofid/ofw035. PMC   4800457 . PMID   27006960.
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  29. Deeks, Steven G; Lewin, Sharon R; Ross, Anna Laura; Ananworanich, Jintanat; Benkirane, Monsef; Cannon, Paula; Chomont, Nicolas; Douek, Daniel; Lifson, Jeffrey D (2016). "International AIDS Society global scientific strategy: towards an HIV cure 2016" (PDF). Nature Medicine. 22 (8): 839–850. doi:10.1038/nm.4108. hdl:10044/1/45370. PMC   5322797 . PMID   27400264.
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