HIV disease progression rates

Following infection with HIV-1, the rate of clinical disease progression varies between individuals. Factors such as host susceptibility, genetics and immune function,[1] health care and co-infections[2] as well as viral genetic variability[3] may affect the rate of progression to the point of needing to take medication in order not to develop AIDS.

## Contents

* 1 Rapid progressors
* 2 Long term non-progressors
* 3 Highly exposed persistently seronegative
* 4 Prediction of progression rates
* 5 HIV subtype variation and effect on progression rates
* 6 Host genetic susceptibility
* 7 Effect of co-infections on progression rates
* 8 See also
* 9 References
* 10 External links

## Rapid progressors[edit | edit source]

A small percentage of HIV-infected individuals rapidly progress to AIDS if they fail to take the medication within four years after primary HIV-infection and are termed Rapid Progressors (RP).[4] Indeed, some individuals have been known to progress to AIDS and death within a year after primo-infection. Rapid progression was originally thought to be continent specific, as some studies reported that disease progression is more rapid in Africa,[4][5][6] but others have contested this view.[1][2][7][8]

## Long term non-progressors[edit | edit source]

Main articles: Long-term nonprogressor and elite controllers

Another subset of individuals who are persistently infected with HIV-1, but show no signs of disease progression for over 12 years and remain asymptomatic are classified as Long Term Non-Progressors (LTNP). In these individuals, it seems that HIV-infection has been halted with regard to disease progression over an extended period of time.[9][10][11][12] However, the term LTNP is a misnomer as that progression towards AIDS can occur even after 15 years of stable infection.[13] LTNP are not a homogeneous group regarding both viral load and specific immune responses against HIV-1. Some LTNPs are infected with HIV that inefficiently replicates[14][15] whilst others are infected with HIV that is virally fit and replicates normally, but the infected individual has had a strong and broad set of HIV-specific humoral and cell-mediated responses that seems to delay the progression to AIDS. In some cohorts, individuals who experience signs of progression, but whose clinical and laboratory parameters remain stable over long periods of time, are classified as Long Term Survivors (LTS).[3]

## Highly exposed persistently seronegative[edit | edit source]

There is another, smaller percentage of individuals who have been recently identified. These are called Highly Exposed Persistently Seronegative (HEPS). This is a small group of individuals and has been observed only in a group of uninfected HIV-negative sex workers in Kenya and in The Gambia. When these individuals' PBMCs are stimulated with HIV-1 peptides, they have lymphoproliferative activity and have HIV-1 specific CD8+ CTL activity suggesting that transient infection may have occurred.[16][17][18][19] This does not occur in unexposed individuals. What is interesting, is that the CTL epitope specificity differs between HEPS and HIV positive individuals, and in HEPS, the maintenance of responses appears to be dependent upon persistent exposure to HIV.[20]

## Prediction of progression rates[edit | edit source]

During the initial weeks after HIV infection, qualitative differences in the cell-mediated immune response are observed that correlate with different disease progression rates (i.e., rapid progression to WHO stage 4 and the rapid loss of CD4\+ T cell levels versus normal to slow progression to WHO stage 4 and the maintenance of CD4+ T cell counts above 500/µl). The appearance of HIV-1-specific CD8+ cytotoxic T cells (CTLs) early after primo-infection has been correlated with the control of HIV-1 viremia.[21][22] The virus which escapes this CTL response have been found to have mutations in specific CTL epitopes.[23][24][25][26] Individuals with a broad expansion of the V-beta chain of the T cell receptor of CD8+ T cells during primo-infection appear to have low levels of virus six to twelve months later, which is predictive of relatively slow disease progression. In contrast, individuals with an expansion of only a single subset of the V-beta chain of the CD8+ T cells are not able to control HIV levels over time, and thus have high viral loads six to twelve months later.[27] LTNP’s have also been shown to have a vigorous proliferation of circulating activated HIV-1-specific CD4+ T cell[28] and CTL response[29][30] against multiple epitopes with no detectable broadly cross-reactive neutralizing antibodies in the setting of an extremely low viral load.[13] However, a few reports have correlated the presence of antibodies against Tat in LTNP status.[citation needed]

## HIV subtype variation and effect on progression rates[edit | edit source]

The HIV-1 subtype that an individual becomes infected with can be a major factor in the rate of progression from sero-conversion to AIDS. Individuals infected with subtypes C, D and G are 8 times more likely to develop AIDS than individuals infected with subtype A.[31] In Uganda, where subtypes A and D are most prevalent,[32] subtype D is associated with faster disease progression compared with subtype A.[33] Age has also been shown to be a major factor in determining survival and the rate of disease progression, with individuals over 40 years of age at sero-conversion being associated with rapid progression.[34][35][36][37]

## Host genetic susceptibility[edit | edit source]

The Centers for Disease Control and Prevention (CDC) has released findings that genes influence susceptibility to HIV infection and progression to AIDS. HIV enters cells through an interaction with both CD4 and a chemokine receptor of the 7 transmembrane family. They first reviewed the role of genes in encoding chemokine receptors (CCR5 and CCR2) and chemokines (SDF-1). While CCR5 has multiple variants in its coding region, the deletion of a 32-bp segment results in a nonfunctional receptor, thus preventing HIV entry; two copies of this gene provide strong protection against HIV infection, although the protection is not absolute. This allele is found in around 10% of Europeans but is rare in Africans and Asians. Multiple studies of HIV-infected persons have shown that presence of one copy of this mutation, named CCR5-Δ32 (CCR5 delta 32) delays progression to the condition of AIDS by about 2 years.[citation needed]

The National Institute of Health (NIH) has funded research studies to learn more about this genetic mutation. In such research, NIH has found that there exist genetic tests that can determine if a person has this mutation. Implications of a genetic test may in the future allow clinicians to change treatment for the HIV infection according to the genetic makeup of an individual,[38] Currently there exist several at-home tests for the CCR5 mutation in individuals; however, they are not diagnostic tests.[citation needed]

A relatively new class of drugs for HIV treatment relies on the genetic makeup of the individual. Entry inhibitors bind to the CCR5 protein to block HIV from binding to the CD4 cell.[citation needed]

## Effect of co-infections on progression rates[edit | edit source]

Coinfections or immunizations may enhance viral replication by inducing a response and activation of the immune system. This activation facilitates the three key stages of the viral life cycle: entry to the cell; reverse transcription and proviral transcription.[39] Chemokine receptors are vital for the entry of HIV into cells. The expression of these receptors is inducible by immune activation caused through infection or immunization, thus augmenting the number of cells that are able to be infected by HIV-1.[40][41] Both reverse transcription of the HIV-1 genome and the rate of transcription of proviral DNA rely upon the activation state of the cell and are less likely to be successful in quiescent cells. In activated cells there is an increase in the cytoplasmic concentrations of mediators required for reverse transcription of the HIV genome.[42][43] Activated cells also release IFN-alpha which acts on an autocrine and paracrine loop that up-regulates the levels of physiologically active NF-kappa B which activates host cell genes as well as the HIV-1 LTR.[44][45] The impact of co-infections by micro-organisms such as Mycobacterium tuberculosis can be important in disease progression, particularly for those who have a high prevalence of chronic and recurrent acute infections and poor access to medical care.[46] Often, survival depends upon the initial AIDS-defining illness.[37] Co-infection with DNA viruses such as HTLV-1, herpes simplex virus-2, varicella zoster virus and cytomegalovirus may enhance proviral DNA transcription and thus viral load as they may encode proteins that are able to trans-activate the expression of the HIV-1 pro-viral DNA.[47] Frequent exposure to helminth infections, which are endemic in Africa, activates individual immune systems, thereby shifting the cytokine balance away from an initial Th1 cell response against viruses and bacteria which would occur in the uninfected person to a less protective T helper 0/2-type response.[48] HIV-1 also promotes a Th1 to Th0 shift and replicates preferentially in Th2 and Th0 cells.[49] This makes the host more susceptible to and less able to cope with infection with HIV-1, viruses and some types of bacteria. Ironically, exposure to dengue virus seems to slow HIV progression rates temporarily.[citation needed]

## See also[edit | edit source]

* CCR5

## References[edit | edit source]

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2. ↑ 2.0 2.1 Morgan, D.; C. Mahe; B. Mayanja; J.A. Whitworth (2002). "Progression to symptomatic disease in people infected with HIV-1 in rural Uganda: prospective cohort study". BMJ. 324 (7331): 193–196. doi:10.1136/bmj.324.7331.193. ISSN 1180-9639. PMC 64788. PMID 11809639.
3. ↑ 3.0 3.1 Campbell, G.R.; et al. (2004). "The glutamine-rich region of HIV-1 Tat protein involved in T cell apoptosis". Journal of Biological Chemistry. 279 (46): 48197–48204. doi:10.1074/jbc.M406195200. PMID 15331610.
4. ↑ 4.0 4.1 Anzala, O.A.; N.J. Nagelkerke; J.J. Bwayo; D. Holton; S. Moses; E.N. Ngugi; J.O. Ndinya-Achola; F.A. Plummer (1995). "Rapid progression to disease in African sex workers with human immunodeficiency virus type 1 infection". Journal of Infectious Diseases. 171 (3): 686–689. doi:10.1093/infdis/171.3.686. PMID 7876618.
5. ↑ N'Galy B, Ryder RW, Bila K, Mwandagalirwa K, Colebunders RL, Francis H, Mann JM, Quinn TC (1988). "Human immunodeficiency virus infection among employees in an African hospital". N. Engl. J. Med. 319 (17): 1123–7. doi:10.1056/NEJM198810273191704. PMID 3262826.
6. ↑ Whittle, H.; A. Egboga; J. Todd; T. Corrah; A. Wilkins; E. Demba; G. Morgan; M. Rolfe; N. Berry; R. Tedder (1992). "Clinical and laboratory predictors of survival in Gambian patients with symptomatic HIV-1 or HIV-1 infection". AIDS. 6 (7): 685–689. doi:10.1097/00002030-199207000-00011. PMID 1354448. S2CID 21272316.
7. ↑ Marlink, R.; et al. (1994). "Reduced rate of disease development after HIV-2 infection as compared to HIV-1". Science. 265 (5178): 1587–1590. Bibcode:1994Sci...265.1587M. doi:10.1126/science.7915856. PMID 7915856.
8. ↑ French, N.; A. Mujugira; J. Nakiyingi; D. Mulder; E.N. Janoff; C.R. Gilks (1999). "Immunologic and clinical stages in HIV-1-infected Ugandan adults are comparable and provide no evidence of rapid progression but poor survival with advanced disease". Journal of Acquired Immune Deficiency Syndromes. 22 (5): 509–516. doi:10.1097/00126334-199912150-00013. PMID 10961614.
9. ↑ Buchbinder, S.P.; M.H. Katz; N.A. Hessol; P.M. O'Malley; S.D. Holmberg (1994). "Long-term HIV-1 infection without immunologic progression". AIDS. 8 (8): 1123–1128. doi:10.1097/00002030-199408000-00014. PMID 7986410. S2CID 22313180. Archived from the original on 2020-08-18. Retrieved 2023-01-28.
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11. ↑ Easterbrook, P.J. (1994). "Non-progression in HIV infection". AIDS. 8 (8): 1179–1182. doi:10.1097/00002030-199408000-00023. PMID 7832923.
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13. ↑ 13.0 13.1 Harrer, T.; et al. (1996). "Strong cytotoxic T cell and weak neutralizing antibody responses in a subset of persons with stable nonprogressing HIV type 1 infection". AIDS Research and Human Retroviruses. 12 (7): 585–592. doi:10.1089/aid.1996.12.585. PMID 8743084.
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29. ↑ Rowland-Jones, S.L.; et al. (1999). "Broadly cross-reactive HIV-specific cytotoxic T-lymphocytes in highly exposed persistently seronegative donors". Immunology Letters. 66 (1–3): 9–14. doi:10.1016/S0165-2478(98)00179-5. PMID 10203028.
30. ↑ Dyer, W.B.; et al. (199). "Strong Human Immunodeficiency Virus (HIV)-Specific Cytotoxic T-Lymphocyte Activity in Sydney Blood Bank Cohort Patients Infected with nef-Defective HIV Type 1". Journal of Virology. 73 (1): 436–443. doi:10.1128/JVI.73.1.436-443.1999. PMC 103850. PMID 9847349.
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33. ↑ Kaleebu, P.; et al. (2002). "Effect of human immunodeficiency virus (HIV) type 1 envelope subtypes A and D on disease progression in a large cohort of HIV-1-positive persons in Uganda". Journal of Infectious Diseases. 185 (9): 1244–1250. doi:10.1086/340130. PMID 12001041.
34. ↑ Koblin, B.A.; et al. (1999). "Long-term survival after infection with human immunodeficiency virus type 1 (HIV-1) among homosexual men in hepatitis B vaccine trial cohorts in Amsterdam, New York City, and San Francisco, 1978-1995". American Journal of Epidemiology. 150 (10): 1026–1030. doi:10.1093/oxfordjournals.aje.a009926. PMID 10568617.
35. ↑ Pezzotti, P.; N. Galai; D. Vlahov; G. Rezza; C.M. Lyles; J. Astemborski (1999). "Direct comparison of time to AIDS and infectious disease death between HIV seroconverter injection drug users in Italy and the United States: results from the ALIVE and ISS studies. AIDS Link to Intravenous Experiences. Italian Seroconversion Study". Journal of Acquired Immune Deficiency Syndromes and Human Retrovirology. 20 (3): 275–282. doi:10.1097/00042560-199903010-00010. PMID 10077177.
36. ↑ Collaborative Group on AIDS Incubation and HIV Survival including the CASCADE EU Concerted Action. Concerted Action on SeroConversion to AIDS and Death in Europe (2000). "Time from HIV-1 seroconversion to AIDS and death before widespread use of highly active antiretroviral therapy: a collaborative re-analysis". Lancet. 355 (9210): 1131–1137. doi:10.1016/S0140-6736(00)02061-4. PMID 10791375. S2CID 30898766.
37. ↑ 37.0 37.1 Morgan, D.; G.H. Maude; S.S. Malamba; M.J. Okongo; H.U. Wagner; D.W. Mulder; J.A. Whitworth (1997). "HIV-1 disease progression and AIDS-defining disorders in rural Uganda". Lancet. 350 (9073): 245–250. doi:10.1016/S0140-6736(97)01474-8. PMID 9242801. S2CID 22453416.
38. ↑ Gonzalez, E.; et al. (2005). "The influence of CCL3L1 gene-containing segmental duplications on HIV-1/AIDS susceptibility". Science. 307 (5714): 1422–1424. Bibcode:2005Sci...307.1434G. doi:10.1126/science.1101160. PMID 15637236. S2CID 8815153.
39. ↑ Lawn, S.D.; S.T. Butera; T.M. Folks (2001). "Contribution of Immune Activation to the Pathogenesis and Transmission of Human Immunodeficiency Virus Type 1 Infection". Clinical Microbiology Reviews. 14 (4): 753–777. doi:10.1128/CMR.14.4.753-777.2001. PMC 89002. PMID 11585784.
40. ↑ Wahl, S.M.; T. Greenwell-Wild; G. Peng; H. Hale-Donze; T.M. Doherty; D. Mizel; J.M. Orenstein (1998). "Mycobacterium avium complex augments macrophage HIV-1 production and increases CCR5 expression". PNAS. 95 (21): 12574–12579. Bibcode:1998PNAS...9512574W. doi:10.1073/pnas.95.21.12574. PMC 22872. PMID 9770527.
41. ↑ Juffermans NP, Speelman P, Verbon A, Veenstra J, Jie C, van Deventer SJ, van Der Poll T (2001). "Patients with active tuberculosis have increased expression of HIV coreceptors CXCR4 and CCR5 on CD4(+) T cells" (PDF). Clinical Infectious Diseases. 32 (4): 650–652. doi:10.1086/318701. PMID 11181132. Archived (PDF) from the original on 2023-05-14. Retrieved 2023-01-28.
42. ↑ Zack, J.A.; S.J. Arrigo; S.R. Weitsman; A.S. Go; A. Haislip; I.S. Chen (1990). "HIV-1 entry into quiescent primary lymphocytes: molecular analysis reveals a labile, latent viral structure". Cell. 61 (2): 213–222. doi:10.1016/0092-8674(90)90802-L. PMID 2331748. S2CID 324887.
43. ↑ Kinoshita, S.; B.K. Chen; H. Kaneshima; G.P. Nolan (1998). "Host control of HIV-1 parasitism in T cells by the nuclear factor of activated T cells". Cell. 95 (5): 595–604. doi:10.1016/S0092-8674(00)81630-X. PMID 9845362. S2CID 17954556.
44. ↑ Gaynor, R. (1992). "Cellular transcription factors involved in the regulation of HIV-1 gene expression". AIDS. 6 (4): 347–363. doi:10.1097/00002030-199204000-00001. PMID 1616633.
45. ↑ Baeuerle, P.A. (1991). "The inducible transcription activator NF-kappa B: regulation by distinct protein subunits". Biochimica et Biophysica Acta (BBA) - Reviews on Cancer. 1072 (1): 63–80. doi:10.1016/0304-419x(91)90007-8. PMID 2018779.
46. ↑ Blanchard, A.; L. Montagnier; M.L. Gougeon (1997). "Influence of microbial infections on the progression of HIV disease". Trends in Microbiology. 5 (8): 326–331. doi:10.1016/S0966-842X(97)01089-5. PMID 9263412.
47. ↑ Gendelman, H.E.; et al. (1986). "Trans-activation of the human immunodeficiency virus long terminal repeat sequence by DNA viruses". PNAS. 83 (24): 9759–9763. Bibcode:1986PNAS...83.9759G. doi:10.1073/pnas.83.24.9759. PMC 387220. PMID 2432602.
48. ↑ Bentwich, Z.; A. Kalinkovich; Z. Weisman (1995). "Immune activation is a dominant factor in the pathogenesis of African AIDS". Immunology Today. 16 (4): 187–191. doi:10.1016/0167-5699(95)80119-7. PMID 7734046.
49. ↑ Maggi, E.; et al. (1994). "Ability of HIV to promote a TH1 to TH0 shift and to replicate preferentially in TH2 and TH0 cells". Science. 265 (5169): 244–248. doi:10.1126/science.8023142. PMID 8023142.

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* "Gene Variation May Raise Risk of H.I.V., Study Finds" Archived 2022-11-26 at the Wayback Machine from The New York Times, 2008

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