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HIV latency and its translational implications
Introduction
Acquired immunodeficiency syndrome (AIDS) is a medical condition caused by human
immunodeficiency virus (HIV), and is characterized by significantly reduced plasma CD4 T cell
count (below 150/ml) and acquisition of rare cancers or/ and infections (e.g. Non-Hodgkin
lymphoma, tuberculosis, and candidiasis)[1]. 35 million people worldwide are infected by HIV,
vast majority of them are living in developing nations, especially in Sub-Saharan Africa. Of 35
million infected individuals, 3.2 are children[2].The introduction of antiretroviral therapy in
1986 was considered as a breakthrough in HIV infection/ AIDS as it reduced plasma viral load
significantly, prolonged the life expectation, and improved the quality of life of infected
people[3]. Unfortunately, incomplete virus eradication, drug resistance, side effects and high
cost put doubts on the future prospects of antiretroviral therapy in clinics[4]. Previous studies
revealed that reactivation of latent HIV in resting T cell is responsible for constant recurrence of
infection in patients who discontinued the therapy[5], putting urgent needs for new therapies.
Intriguingly, researchers proposed one so called “ shock and kill” strategy, which describes the
eradication of latent viral pool by inducing virus reactivation (hence “shock”) in complement
with antiretroviral therapy ( hence “kill”), giving hope for the development of new therapies.
However, one of the key questions needs to be elucidated is what causes HIV enters latency.
Tat, which has long been evident to be an viral transactivator that regulates initiation,
elongation processes, is crucial HIV latency biology [6,7]. Changes in cellular microenvironment,
viral gene transcription level and chromatin configuration are known factors that force HIV
Pre-sessional Summer School Summative Report, 2015
Qilong Wu
QMUL&NCU
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enters latent life cycle. What is noteworthy is that Tat does not work alone, requiring
cofactors(i.e. RTEFb, P-TEFB and NF-kB), which are potential drug targets.
This report is aimed at revising the recent advance in HIV infection/AIDS treatment. Firstly, HIV
latency biology and development of antiretroviral therapy will be introduced as foundations of
what led to the breakthrough and why we need the breakthrough in HIV/AIDS treatment.
Secondly, translational implications from research and other treatment alternatives will be
discussed. Finally, limitations of the breakthrough as well as other theories will be covered in
the discussion session.
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Early treatment-Antiretroviral therapies andtheir limitations
A. Development history
Antiretroviral therapies are combination of chemical drugs that suppress the entry,
replication and spread of HIV in cells. Combined antiretroviral therapies consist of several
inhibitors and are referred to as highly active anti-retroviral therapy (HAART)[8, WHO]. The
history of antiretroviral therapy originated from a clinical trial about zidovudine carried out
by Fischl and colleagues in 1986[9], since then Hammer et al proposed “triple-drug anti-HIV
therapy concept” based on the significant reduction of mortality rate in HIV infected who
were given indinavir-based HAARTs[10]. Antiretroviral therapies reduce plasma viral load,
improves CD4+T cell count (above 500 cells/ ul according to a report[11]) and the quality of
life. Nonetheless, treatment by antiretroviral therapy during the first decade is regretfully
unsuccessful[12]. The reasons for that will be discussed in the next session.
B. Limitations of antiretroviral therapies
A variety of antiretroviral drugs have been developed since its primary introduction. There
are five categories of antiretroviral drugs that are currently available: non-nucleoside
reverse transcriptase inhibitors (NNRTIs), nucleoside reverse transcriptase inhibitors
(NRTIs), protease inhibitors, entry and fusion inhibitors and integrase inhibitor[13]. Drugs of
each categories and their action mechanisms are listed below. Examples are given in
table1[14,15]. As effective and successful as antiretroviral drugs are meant to be,
observations of infection relapses, increased plasma viral load as well as reduced CD4+ T cell
count have been made in patients who discontinued their therapy. Moreover, considerable
Pre-sessional Summer School Summative Report, 2015
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QMUL&NCU
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antiretroviral drugs that are currently being used in clinical practice have potential to cause
unwanted effects including nephrotoxicity, neurotoxicity, diarrhea, rash[16].
Table1. Examples of drugs of each categories
Table1: Names listed are the generic name of drugs. In clinical practice, different categories of
drugs are prescribed in combination to maximize the effectiveness of drugs.
Drug resistance, like in the drug treatment of any other infections caused by microorganisms,
especially in the treatment of bacterial infections, is inevitably identified in HIV infection/AIDS
treatment. The situation might be even worse regarding the fact that retrovirus, viral group to
which HIV belongs, has a very high mutation rate because of its single-stranded RNA genome,
which is not as stable as double-stranded DNA. Hence, it is strongly suggested that doctors
perform HIV genotypic resistance tests before prescribing the most appropriate and efficacious
antiretroviral drugs. Interestingly, there are debates about the availability of HIV genotypic
NNRTIs NRTIs Protease
inhibitor
Entry and fusion
inhibitor Integrase
inhibitor
Examples Festinavir,
Tenofovir
Nevirapine,
Efavirenz
Simeprevir,
Boceprevir
Albuvirtide Elitegravir
Pre-sessional Summer School Summative Report, 2015
Qilong Wu
QMUL&NCU
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resistance tests in areas where medical settings , putting constraints on wide-spread utilization
of genotypic testing[17]. Laethem et al suggest in their research that the next generation
sequencing technique has larger throughput and is more affordable[17]. Nevertheless, HIV
genotypic testing will not relive the drug resistance that the HIV infection/AIDS treatment
community currently suffer from. New hope relies in new therapeutic strategies.
Hints for new therapies-Understandings from HIV latency biology
A. Tat mediated transcriptional feedback loop
Tat was primary described by Sodroski and colleagues in 1985 as a viral transactivator that
regulates initiation, elongation processes of transcription[17]. Tat binds to viral DNA and recruits
transcription factors such as RTEFB and P-TEFB, for instance[18]. Hence, together they initiate
transcription of viral gene. Epigenetic modification of viral gene and viral gene transcription
interruption play crucial roles in HIV latency, although it is still controversial which one of them
is the primary cause[19,20]. Recent research shown Tat as potential causative agent of B cell
lymphoma in HIV infected individuals or AIDS patient[21], which might explain the prevalence of
B cell lymphoma in AIDS patients. That is important because studies of Tat in B cell lymphoma
will probably extend our knowledge about Tat biology in HIV latency.
B. Inducible reactivation from latency
HIV reservoir, resting CD4+ T cell, is the main obstacle for eradicating the virus by antiretroviral
therapies. Previous research carried out suggests induced virus reactivation in complement with
antiretroviral drug interventions as well as the immune systemof the host could facilitate virus
eradication [22]. Indeed, methyl transferase inhibitor and acetyl transferase inhibitors which
prevent epigenetic modification of viral genes, have been proven to be effective at inducing viral
reactivation[6].Furthermore, activation of T cell receptor (TCR) stimulated by alpha-CD3/CD28
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QMUL&NCU
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monoclonal antibodies causes reactivationof latent HIV by activating p-TEFb, which is anessential
transcription factor for HIV, and is usually suppressed by infected host cell as a defense
system.[11]. There are debates concerning inducible HIV reactivation could potentially cause
“HIV-associated complications”[23], but this worry is less significant when considering most of
the HIV infected individuals who received antiretroviral therapies are immune-competent.
Newlight-Translational implicationsfromHIVlatency biology research
Researche into HIV latency biology have led to one important outcome that is of greatest
translational implications. It is Tat-pTEFb interaction [29].
Transcription factor pTEFb comprises a cyclin-dependent kinase 9, CDK9[25] ,and a partner
cyclin T1, T2, or K[26]. Burlein and colleagues conducted an elegant study whereby they
designed a homogenous assay in Alpha LISA format using His-tagged pTEFb and biotinylated
Tat, which enabled the authors to observe the interaction between Tat and its cofactor
pTEFb[24]. Tat forms a quaternary complex with pTEFb and other molecules. Together, they
initiate the phosphorylation of viral RNA polymerase II and elongation of viral RNA[24]. Upon
infection, CD4+T cell initiates the conversion of pTEFb into RNP complex that comprises 7SK
RNA and 7SK RNP in resting T cells, resulting in dramatic decrease in intracellular pTEFb
level[25,26]. Therefore, HIV will not be able to replicate itself because of pTEFb deprivation.
Having said that, development of drugs that reverse the transformation of pTEFb into RNP
complexes or simply pTEFb transcription factor supply could induce reactivation of latent HIV.
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In addition, other therapeutic strategy such as HIV immunization is increasingly being revised as
potential new treatment. Immunization strategy includes therapeutic and preventive vaccine.
The former targets key molecules in HIV life cycle, preventing it from reactivation, replication,
and transmission to uninfected individuals[27]. Preventive vaccine, however, is dedicated to
preventing the virus from entering susceptible people[27]. Immunization strategies are more
cost-effective. This is of particular significance in under-developed area where antiretroviral
drugs are less available and affordable[38]. Examples of therapeutic and preventive vaccine
candidates (have not been proven to market) as well as their limitations and advantages are
listed in table2.
Table 2. The compare and contrast between therapeutic and preventive vaccines
Therapeutic vaccine Preventive vaccine
Examples Vacc-4x, Pep Tcell,
Thera Vax, Tat vaccine[34].
MRK rAd5, HVTN 502,
HVNT503, HVNT505[34].
Component Peptides, plasmid, viral
porteins, modified Tat.
HIV-1 Gag, Pol, Nef, and Env.
Advantages
Simple efficacy assessment,
facilitates the identification
of potential biomarkers that
can be drug targets, enhance
the effects of antiretroviral
drug[27].
Tat vaccine, which utilizes
biologically active viral Tat
protein to stimulate the body
to produce anti-Tat
antibodies, is considered as
the key to achieve anti-HIV
immunity[28,29]
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Limitations
Therapeutic vaccines are
effective only at the early
sate of HIV infection, which
contraindicates with the
current difficulties in making
early diagnosis[27].
Unlike therapeutic vaccines,
research into preventive
vaccine has been not fruitful
due to three reasons: 1) lack
of efficacy trial; 2) safety
concerns; 3) vaccines failed
to offer protection[30-34]
Table2. Vaccines listed are available at:
http://www.pipelinereport.org/sites/g/files/g575521/f/201407/Cure%20Immune%20Based
%20and%20Gene%20Therapies.pdf
Discussion
“Shock and kill” strategy is a new HIV/AIDS treatment characterized by induced reactivation of
latent HIV in combination with antiretroviral therapy. However, this proposal is in its infancy.
Considerable pharmaceutical and clinical trials are required to develop drugs that are capable
of inducing viral reactivation effectively and safely in patients.
Notably, there has been research suggesting virus eradication by preventing HIV reactivates
from latency. Szeto and colleagues demonstrated in their research that minocycline, an
immunomodulatory antibiotic, suppresses replication and reactivation of HIV. Hence has anti-
HIV effect[35]. Unlike conventional anti-HIV drugs which work by directly targeting HIV,
minocycline achieves its anti-HIV effect by altering cellular environment. More specifically,
minocycline causes dose-dependent decrease in viral RNA by downregulating the expression of
activation and proliferation biomarkers (e.g. CD25 and CCR5) in CD4+cell, and by decreasing cell
Pre-sessional Summer School Summative Report, 2015
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cytokine (e.g. IFN-gamma and TNF-alpha) secretion level[36]. Mousseau et al also showed in
their publication that Didehydro-Cortistatin A (cDA) prevents HIV-1 from reactivating from
latency[37]. The authors proposed that dCA probably cause epigenetic changes in HIV viral
genome (no direct evidence showed there were epigenetic modification changes), concluding
from their observation of no viral reactivation even after withdrawal of dCA[37]. Those two
teams offered an opinion that is totally opposite to the rationale this report has been
discussing. This is interesting, especially when considering the advantages and disadvantages of
those two contrast strategies. Inducing viral reactivation is more robust, but has the potential
to cause HIV-associated complications in immuno-compromised patients. Preventing virus from
reactivating is soft, but it will inevitably cause “non-AIDS-associated disease” caused by
consistent release of provirus from infected CD4+T cell. In this regard, it is seems sensible to
seek more integrated treatment.
Amongst our limited choices, traditional Chinese medicine (TCM) is worth considering. As one
of the oldest medical systems ever been practiced by human-beings, TCM has invaluable clinical
utilization in terms of disease treatment in modern medicine system. As a matter of fact, TCM
has been proved to be effective at monitoring HIV/AIDS, cancer, and infertility[38-42]. Of
particular interest of this report, understanding of TCM in HIV/AIDS treatment will be discussed.
According to traditional Chinese medicine pattern identification, AIDS is defined as “yi bing”,
disease characterized by long latency, sudden onset, and serve symptoms[43], which is
interestingly consistent with the Western Medicine’s description of HIV/AIDS. Nevertheless,
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Western Medicine and TCMdo function in different systems and adapt inconsistent therapeutic
strategies and beliefs. For example, in the treatment of AIDS, TCM focuses on the treatment of
the patient with the disease rather than the disease to which western medicine pays
attention[43]. In addition, TCM is based on the utilization of herbs and other natural exist
material, which is completely different to the artificially synthesized chemicals used by Western
Medicine. Regretfully, despite of all those advantageous facts about TCM, it has yet not been
accepted and recommended by scientists and heath-care professionals word-wide[43]. This is
because there is a considerable lack of intensive clinical trails trying to elucidate the action
mechanisms of Chinese herbs[43]. In this regard, researchers proposed Complementary and
Integrate Medicine(CIM) based on the combination between TCMand Western Medicine,
which is a fast-developing area, and has been widely utilized in China for HIV/AIDS treatment.
Conclusion
Infection relapses, increase in plasma viral load , and decrease in CD4+ T cell count are observed
in HIV infected /AIDS patients when therapies are discontinued. This is probably because of the
conventional antiretroviral therapy’s failure to eradicate the virus from the patient’s body.
Unfortunately, the further employment of conventional antiretroviral drugs in clinical practice
is constrained by its limitations that are difficult to overcome. Encouragingly, a large number of
research has been conducted and proven to be fruitful, shedding light into the understandings
of HIV latency biology. Identification of Tat-mediated transcriptional feedback system,
particularly its cofactors, P-TEFB and NF-kB, is of great significance, giving translational
implications. Methyl transferase, acetyl transferase inhibitors, and anti-TCR monoclonal
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antibodies are receiving attention as viral reactivation inducers. New therapeutic strategies
such as preventive and therapeutic vaccines and CIM are the future HIV infection/AIDS
treatment development direction.
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1a661b19-cff6-4a67-a7c0-18348672a12c-151230114454

  • 1. HIV latency and its translational implications Introduction Acquired immunodeficiency syndrome (AIDS) is a medical condition caused by human immunodeficiency virus (HIV), and is characterized by significantly reduced plasma CD4 T cell count (below 150/ml) and acquisition of rare cancers or/ and infections (e.g. Non-Hodgkin lymphoma, tuberculosis, and candidiasis)[1]. 35 million people worldwide are infected by HIV, vast majority of them are living in developing nations, especially in Sub-Saharan Africa. Of 35 million infected individuals, 3.2 are children[2].The introduction of antiretroviral therapy in 1986 was considered as a breakthrough in HIV infection/ AIDS as it reduced plasma viral load significantly, prolonged the life expectation, and improved the quality of life of infected people[3]. Unfortunately, incomplete virus eradication, drug resistance, side effects and high cost put doubts on the future prospects of antiretroviral therapy in clinics[4]. Previous studies revealed that reactivation of latent HIV in resting T cell is responsible for constant recurrence of infection in patients who discontinued the therapy[5], putting urgent needs for new therapies. Intriguingly, researchers proposed one so called “ shock and kill” strategy, which describes the eradication of latent viral pool by inducing virus reactivation (hence “shock”) in complement with antiretroviral therapy ( hence “kill”), giving hope for the development of new therapies. However, one of the key questions needs to be elucidated is what causes HIV enters latency. Tat, which has long been evident to be an viral transactivator that regulates initiation, elongation processes, is crucial HIV latency biology [6,7]. Changes in cellular microenvironment, viral gene transcription level and chromatin configuration are known factors that force HIV
  • 2. Pre-sessional Summer School Summative Report, 2015 Qilong Wu QMUL&NCU 2 enters latent life cycle. What is noteworthy is that Tat does not work alone, requiring cofactors(i.e. RTEFb, P-TEFB and NF-kB), which are potential drug targets. This report is aimed at revising the recent advance in HIV infection/AIDS treatment. Firstly, HIV latency biology and development of antiretroviral therapy will be introduced as foundations of what led to the breakthrough and why we need the breakthrough in HIV/AIDS treatment. Secondly, translational implications from research and other treatment alternatives will be discussed. Finally, limitations of the breakthrough as well as other theories will be covered in the discussion session.
  • 3. Pre-sessional Summer School Summative Report, 2015 Qilong Wu QMUL&NCU 3 Early treatment-Antiretroviral therapies andtheir limitations A. Development history Antiretroviral therapies are combination of chemical drugs that suppress the entry, replication and spread of HIV in cells. Combined antiretroviral therapies consist of several inhibitors and are referred to as highly active anti-retroviral therapy (HAART)[8, WHO]. The history of antiretroviral therapy originated from a clinical trial about zidovudine carried out by Fischl and colleagues in 1986[9], since then Hammer et al proposed “triple-drug anti-HIV therapy concept” based on the significant reduction of mortality rate in HIV infected who were given indinavir-based HAARTs[10]. Antiretroviral therapies reduce plasma viral load, improves CD4+T cell count (above 500 cells/ ul according to a report[11]) and the quality of life. Nonetheless, treatment by antiretroviral therapy during the first decade is regretfully unsuccessful[12]. The reasons for that will be discussed in the next session. B. Limitations of antiretroviral therapies A variety of antiretroviral drugs have been developed since its primary introduction. There are five categories of antiretroviral drugs that are currently available: non-nucleoside reverse transcriptase inhibitors (NNRTIs), nucleoside reverse transcriptase inhibitors (NRTIs), protease inhibitors, entry and fusion inhibitors and integrase inhibitor[13]. Drugs of each categories and their action mechanisms are listed below. Examples are given in table1[14,15]. As effective and successful as antiretroviral drugs are meant to be, observations of infection relapses, increased plasma viral load as well as reduced CD4+ T cell count have been made in patients who discontinued their therapy. Moreover, considerable
  • 4. Pre-sessional Summer School Summative Report, 2015 Qilong Wu QMUL&NCU 4 antiretroviral drugs that are currently being used in clinical practice have potential to cause unwanted effects including nephrotoxicity, neurotoxicity, diarrhea, rash[16]. Table1. Examples of drugs of each categories Table1: Names listed are the generic name of drugs. In clinical practice, different categories of drugs are prescribed in combination to maximize the effectiveness of drugs. Drug resistance, like in the drug treatment of any other infections caused by microorganisms, especially in the treatment of bacterial infections, is inevitably identified in HIV infection/AIDS treatment. The situation might be even worse regarding the fact that retrovirus, viral group to which HIV belongs, has a very high mutation rate because of its single-stranded RNA genome, which is not as stable as double-stranded DNA. Hence, it is strongly suggested that doctors perform HIV genotypic resistance tests before prescribing the most appropriate and efficacious antiretroviral drugs. Interestingly, there are debates about the availability of HIV genotypic NNRTIs NRTIs Protease inhibitor Entry and fusion inhibitor Integrase inhibitor Examples Festinavir, Tenofovir Nevirapine, Efavirenz Simeprevir, Boceprevir Albuvirtide Elitegravir
  • 5. Pre-sessional Summer School Summative Report, 2015 Qilong Wu QMUL&NCU 5 resistance tests in areas where medical settings , putting constraints on wide-spread utilization of genotypic testing[17]. Laethem et al suggest in their research that the next generation sequencing technique has larger throughput and is more affordable[17]. Nevertheless, HIV genotypic testing will not relive the drug resistance that the HIV infection/AIDS treatment community currently suffer from. New hope relies in new therapeutic strategies. Hints for new therapies-Understandings from HIV latency biology A. Tat mediated transcriptional feedback loop Tat was primary described by Sodroski and colleagues in 1985 as a viral transactivator that regulates initiation, elongation processes of transcription[17]. Tat binds to viral DNA and recruits transcription factors such as RTEFB and P-TEFB, for instance[18]. Hence, together they initiate transcription of viral gene. Epigenetic modification of viral gene and viral gene transcription interruption play crucial roles in HIV latency, although it is still controversial which one of them is the primary cause[19,20]. Recent research shown Tat as potential causative agent of B cell lymphoma in HIV infected individuals or AIDS patient[21], which might explain the prevalence of B cell lymphoma in AIDS patients. That is important because studies of Tat in B cell lymphoma will probably extend our knowledge about Tat biology in HIV latency. B. Inducible reactivation from latency HIV reservoir, resting CD4+ T cell, is the main obstacle for eradicating the virus by antiretroviral therapies. Previous research carried out suggests induced virus reactivation in complement with antiretroviral drug interventions as well as the immune systemof the host could facilitate virus eradication [22]. Indeed, methyl transferase inhibitor and acetyl transferase inhibitors which prevent epigenetic modification of viral genes, have been proven to be effective at inducing viral reactivation[6].Furthermore, activation of T cell receptor (TCR) stimulated by alpha-CD3/CD28
  • 6. Pre-sessional Summer School Summative Report, 2015 Qilong Wu QMUL&NCU 6 monoclonal antibodies causes reactivationof latent HIV by activating p-TEFb, which is anessential transcription factor for HIV, and is usually suppressed by infected host cell as a defense system.[11]. There are debates concerning inducible HIV reactivation could potentially cause “HIV-associated complications”[23], but this worry is less significant when considering most of the HIV infected individuals who received antiretroviral therapies are immune-competent. Newlight-Translational implicationsfromHIVlatency biology research Researche into HIV latency biology have led to one important outcome that is of greatest translational implications. It is Tat-pTEFb interaction [29]. Transcription factor pTEFb comprises a cyclin-dependent kinase 9, CDK9[25] ,and a partner cyclin T1, T2, or K[26]. Burlein and colleagues conducted an elegant study whereby they designed a homogenous assay in Alpha LISA format using His-tagged pTEFb and biotinylated Tat, which enabled the authors to observe the interaction between Tat and its cofactor pTEFb[24]. Tat forms a quaternary complex with pTEFb and other molecules. Together, they initiate the phosphorylation of viral RNA polymerase II and elongation of viral RNA[24]. Upon infection, CD4+T cell initiates the conversion of pTEFb into RNP complex that comprises 7SK RNA and 7SK RNP in resting T cells, resulting in dramatic decrease in intracellular pTEFb level[25,26]. Therefore, HIV will not be able to replicate itself because of pTEFb deprivation. Having said that, development of drugs that reverse the transformation of pTEFb into RNP complexes or simply pTEFb transcription factor supply could induce reactivation of latent HIV.
  • 7. Pre-sessional Summer School Summative Report, 2015 Qilong Wu QMUL&NCU 7 In addition, other therapeutic strategy such as HIV immunization is increasingly being revised as potential new treatment. Immunization strategy includes therapeutic and preventive vaccine. The former targets key molecules in HIV life cycle, preventing it from reactivation, replication, and transmission to uninfected individuals[27]. Preventive vaccine, however, is dedicated to preventing the virus from entering susceptible people[27]. Immunization strategies are more cost-effective. This is of particular significance in under-developed area where antiretroviral drugs are less available and affordable[38]. Examples of therapeutic and preventive vaccine candidates (have not been proven to market) as well as their limitations and advantages are listed in table2. Table 2. The compare and contrast between therapeutic and preventive vaccines Therapeutic vaccine Preventive vaccine Examples Vacc-4x, Pep Tcell, Thera Vax, Tat vaccine[34]. MRK rAd5, HVTN 502, HVNT503, HVNT505[34]. Component Peptides, plasmid, viral porteins, modified Tat. HIV-1 Gag, Pol, Nef, and Env. Advantages Simple efficacy assessment, facilitates the identification of potential biomarkers that can be drug targets, enhance the effects of antiretroviral drug[27]. Tat vaccine, which utilizes biologically active viral Tat protein to stimulate the body to produce anti-Tat antibodies, is considered as the key to achieve anti-HIV immunity[28,29]
  • 8. Pre-sessional Summer School Summative Report, 2015 Qilong Wu QMUL&NCU 8 Limitations Therapeutic vaccines are effective only at the early sate of HIV infection, which contraindicates with the current difficulties in making early diagnosis[27]. Unlike therapeutic vaccines, research into preventive vaccine has been not fruitful due to three reasons: 1) lack of efficacy trial; 2) safety concerns; 3) vaccines failed to offer protection[30-34] Table2. Vaccines listed are available at: http://www.pipelinereport.org/sites/g/files/g575521/f/201407/Cure%20Immune%20Based %20and%20Gene%20Therapies.pdf Discussion “Shock and kill” strategy is a new HIV/AIDS treatment characterized by induced reactivation of latent HIV in combination with antiretroviral therapy. However, this proposal is in its infancy. Considerable pharmaceutical and clinical trials are required to develop drugs that are capable of inducing viral reactivation effectively and safely in patients. Notably, there has been research suggesting virus eradication by preventing HIV reactivates from latency. Szeto and colleagues demonstrated in their research that minocycline, an immunomodulatory antibiotic, suppresses replication and reactivation of HIV. Hence has anti- HIV effect[35]. Unlike conventional anti-HIV drugs which work by directly targeting HIV, minocycline achieves its anti-HIV effect by altering cellular environment. More specifically, minocycline causes dose-dependent decrease in viral RNA by downregulating the expression of activation and proliferation biomarkers (e.g. CD25 and CCR5) in CD4+cell, and by decreasing cell
  • 9. Pre-sessional Summer School Summative Report, 2015 Qilong Wu QMUL&NCU 9 cytokine (e.g. IFN-gamma and TNF-alpha) secretion level[36]. Mousseau et al also showed in their publication that Didehydro-Cortistatin A (cDA) prevents HIV-1 from reactivating from latency[37]. The authors proposed that dCA probably cause epigenetic changes in HIV viral genome (no direct evidence showed there were epigenetic modification changes), concluding from their observation of no viral reactivation even after withdrawal of dCA[37]. Those two teams offered an opinion that is totally opposite to the rationale this report has been discussing. This is interesting, especially when considering the advantages and disadvantages of those two contrast strategies. Inducing viral reactivation is more robust, but has the potential to cause HIV-associated complications in immuno-compromised patients. Preventing virus from reactivating is soft, but it will inevitably cause “non-AIDS-associated disease” caused by consistent release of provirus from infected CD4+T cell. In this regard, it is seems sensible to seek more integrated treatment. Amongst our limited choices, traditional Chinese medicine (TCM) is worth considering. As one of the oldest medical systems ever been practiced by human-beings, TCM has invaluable clinical utilization in terms of disease treatment in modern medicine system. As a matter of fact, TCM has been proved to be effective at monitoring HIV/AIDS, cancer, and infertility[38-42]. Of particular interest of this report, understanding of TCM in HIV/AIDS treatment will be discussed. According to traditional Chinese medicine pattern identification, AIDS is defined as “yi bing”, disease characterized by long latency, sudden onset, and serve symptoms[43], which is interestingly consistent with the Western Medicine’s description of HIV/AIDS. Nevertheless,
  • 10. Pre-sessional Summer School Summative Report, 2015 Qilong Wu QMUL&NCU 10 Western Medicine and TCMdo function in different systems and adapt inconsistent therapeutic strategies and beliefs. For example, in the treatment of AIDS, TCM focuses on the treatment of the patient with the disease rather than the disease to which western medicine pays attention[43]. In addition, TCM is based on the utilization of herbs and other natural exist material, which is completely different to the artificially synthesized chemicals used by Western Medicine. Regretfully, despite of all those advantageous facts about TCM, it has yet not been accepted and recommended by scientists and heath-care professionals word-wide[43]. This is because there is a considerable lack of intensive clinical trails trying to elucidate the action mechanisms of Chinese herbs[43]. In this regard, researchers proposed Complementary and Integrate Medicine(CIM) based on the combination between TCMand Western Medicine, which is a fast-developing area, and has been widely utilized in China for HIV/AIDS treatment. Conclusion Infection relapses, increase in plasma viral load , and decrease in CD4+ T cell count are observed in HIV infected /AIDS patients when therapies are discontinued. This is probably because of the conventional antiretroviral therapy’s failure to eradicate the virus from the patient’s body. Unfortunately, the further employment of conventional antiretroviral drugs in clinical practice is constrained by its limitations that are difficult to overcome. Encouragingly, a large number of research has been conducted and proven to be fruitful, shedding light into the understandings of HIV latency biology. Identification of Tat-mediated transcriptional feedback system, particularly its cofactors, P-TEFB and NF-kB, is of great significance, giving translational implications. Methyl transferase, acetyl transferase inhibitors, and anti-TCR monoclonal
  • 11. Pre-sessional Summer School Summative Report, 2015 Qilong Wu QMUL&NCU 11 antibodies are receiving attention as viral reactivation inducers. New therapeutic strategies such as preventive and therapeutic vaccines and CIM are the future HIV infection/AIDS treatment development direction.
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