Kaposi's sarcoma pathophysiology
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Kaposi's sarcoma pathophysiology On the Web
American Roentgen Ray Society Images of Kaposi's sarcoma pathophysiology
Kaposi's sarcoma arises from endothelial cells, which are epithelial cells that normally lines the luminal surface of blood vessels and lymphatic vessels. Kaposi's sarcoma is mainly caused by an infection with Human herpes virus 8 (HHV-8), which is also known as Kaposi's sarcoma-associated herpes virus (KSHV). The main gene involved in the pathogenesis of Kaposi's sarcoma is ORF73 gene, which encodes the viral latency-associated nuclear antigen (LANA-1). Kaposi's sarcoma is commonly associated with acquired immune deficiency syndrome (AIDS). On gross pathology, reddish, violaceous, or bluish-black macules and patches are characteristic findings of Kaposi's sarcoma. On microscopic histopathological analysis, the presence of spindle cells with minimal nuclear atypia are characteristic findings of Kaposi's sarcoma.
- Kaposi's sarcoma arises from endothelial cells, which are epithelial cells that normally lines the luminal surface of blood vessels and lymphatic vessels.
- Kaposi's sarcoma is mainly caused by an infection with Human herpes virus 8 (HHV-8), which is also known as Kaposi's sarcoma-associated herpes virus (KSHV).
- HHV-8 is usually transmitted through both saliva and semen via close sexual contact.
- Another minor routes of transmission for HHV-8 are through organ transplantation and blood transfusion.
- A state of immunosuppression facilitates the development of Kaposi's sarcoma among patients infected with the virus.
- Kaposi's sarcoma is a widely disseminated malignancy that may involve the skin, oral cavity, gastrointestinal tract, and respiratory airways.
- Kaposi's sarcoma is characterised by abnormal proliferation of endothelial cells, neoangiogenesis, and inflammation.
- Cutaneous manifestations of Kaposi's sarcoma are due to:
- The oncogenesis of HHV-8 infection is due to a number of human cellular genes that have been incorporated through molecular piracy into the viral DNA sequence.
- The genes acquired by HHV-8 will augment the cellular proliferation pathways of infected cells through various mediators and DNA synthesis proteins such as:
- The augmentation of such cellular proliferation pathways will protect the virus from the immune system and allow a continuous viral replication during the latency period.
- During the latent period, HHV-8 will express a viral latency-associated nuclear antigen (LANA-1) that acts as transcriptional modulator.
- The functions of HHV-8 viral latency-associated nuclear antigen (LANA-1) include:
- The main gene involved in the pathogenesis of Kaposi's sarcoma is ORF73 gene, which encodes the viral latency-associated nuclear antigen (LANA-1).
- Other viral latent genes involved in the induction of malignant cellular proliferation include:
- Kaposi's sarcoma is associated with a number of conditions that include:
- On gross pathology, reddish, violaceous, or bluish-black macules and patches are characteristic findings of Kaposi's sarcoma.
- The cutaneous lesions start to develop distally then progressively spread and coalesce to form nodules or plaques.
- On microscopic histopathological analysis the presence of spindle cells with minimal nuclear atypia are characteristic findings of Kaposi's sarcoma.
- Other findings of Kaposi's sarcoma on light microscopy may include:
- Excessive vascular proliferation
- Abundant red blood cells
- Red blood cell and hemosiderin extravasation
- Abundant lymphocytes and monocytes
- Premonitory sign (a neovascular lesion wrapped around a pre-existing space)
- Intracytoplasmic PAS +ve hyaline globules (pale pink globs that are paler than red blood cells)
- The table below differentiates between the four main lesion stages of development for Kaposi's sarcoma:
|Lesion Stage||Histologic Features|
- On immunohistochemistry Kaposi's sarcoma is characterized by:
- Detection of the LANA protein antigen in tumor cells confirms the diagnosis.
- The following images show the different gross pathological findings and different sites:
Intraoral lesion depicting Kaposi Sarcoma. Source: Wikimedia Commons 
Violaceous lesions on the nose of Kaposi sarcoma. Source: Wikimedia Commons
Pulmonary lesion of Kaposi sarcoma. Source: Wikimedia Commons 
Lesion in a foot. Source: Wikimedia Commons.
Kaposi sarcoma lesion Source: Wikimedia Commons.
Kaposi sarcoma lesion Source: Wikimedia Commons.
- Illustrated below is a series of microscopic images demonstrating Kaposi's sarcoma:
Kaposi sarcoma observed under low magnification
Kaposi sarcoma observed under high magnification
- Ruocco E, Ruocco V, Tornesello ML, Gambardella A, Wolf R, Buonaguro FM (2013). "Kaposi's sarcoma: etiology and pathogenesis, inducing factors, causal associations, and treatments: facts and controversies". Clin Dermatol. 31 (4): 413–22. doi:10.1016/j.clindermatol.2013.01.008. PMID 23806158.
- Kaposi's Sarcoma. PathologyOutlines (2015) http://www.pathologyoutlines.com/topic/skintumornonmelanocytickaposisarcoma.html Accessed on January, 19 2015
- Cancian L, Hansen A, Boshoff C (2013). "Cellular origin of Kaposi's sarcoma and Kaposi's sarcoma-associated herpesvirus-induced cell reprogramming". Trends Cell Biol. 23 (9): 421–32. doi:10.1016/j.tcb.2013.04.001. PMID 23685018.
- Zattra E Coati I, Alaibac M, Piaserico S (2014). "Kaposi's sarcoma and other rare skin cancers in organ transplant patients". G Ital Dermatol Venereol. 149 (4): 395–400. PMID 25068226.
- Burbelo PD, Leahy HP, Groot S, Bishop LR, Miley W, Iadarola MJ, Whitby D, Kovacs JA (May 2009). "Four-antigen mixture containing v-cyclin for serological screening of human herpesvirus 8 infection". Clin. Vaccine Immunol. 16 (5): 621–7. doi:10.1128/CVI.00474-08. PMC 2681582. PMID 19261774.
- De Leo A, Deng Z, Vladimirova O, Chen HS, Dheekollu J, Calderon A, Myers KA, Hayden J, Keeney F, Kaufer BB, Yuan Y, Robertson E, Lieberman PM (January 2019). "LANA oligomeric architecture is essential for KSHV nuclear body formation and viral genome maintenance during latency". PLoS Pathog. 15 (1): e1007489. doi:10.1371/journal.ppat.1007489. PMID 30682185.
- Zhu L, Wang R, Sweat A, Goldstein E, Horvat R, Chandran B (April 1999). "Comparison of human sera reactivities in immunoblots with recombinant human herpesvirus (HHV)-8 proteins associated with the latent (ORF73) and lytic (ORFs 65, K8.1A, and K8.1B) replicative cycles and in immunofluorescence assays with HHV-8-infected BCBL-1 cells". Virology. 256 (2): 381–92. doi:10.1006/viro.1999.9674. PMID 10191203.
- Grossmann C, Podgrabinska S, Skobe M, Ganem D (2006). "Activation of NF-kappaB by the latent vFLIP gene of Kaposi's sarcoma-associated herpesvirus is required for the spindle shape of virus-infected endothelial cells and contributes to their proinflammatory phenotype". J Virol. 80 (14): 7179–85. doi:10.1128/JVI.01603-05. PMC 1489050. PMID 16809323.
- Muralidhar S, Veytsmann G, Chandran B, Ablashi D, Doniger J, Rosenthal LJ (2000). "Characterization of the human herpesvirus 8 (Kaposi's sarcoma-associated herpesvirus) oncogene, kaposin (ORF K12)". J Clin Virol. 16 (3): 203–13. PMID 10738139.
- Plaisance-Bonstaff K, Choi HS, Beals T, Krueger BJ, Boss IW, Gay LA; et al. (2014). "KSHV miRNAs decrease expression of lytic genes in latently infected PEL and endothelial cells by targeting host transcription factors". Viruses. 6 (10): 4005–23. doi:10.3390/v6104005. PMC 4213575. PMID 25341664.
- Libre Pathology. Kaposi's sarcoma (2015) http://librepathology.org/wiki/index.php/File:Kaposi_sarcoma_low_intermed_mag.jpg Accessed on January, 19 2016
- Photo Credit: Sol Silverman, Jr., D.D.S.Content Providers: CDC/ Sol Silverman, Jr., D.D.S., University of California, San Francisco [Public domain], https://upload.wikimedia.org/wikipedia/commons/d/d5/Kaposi%E2%80%99s_sarcoma_intraoral_AIDS_072_lores.jpg
- Photo courtesy: Michael Sand, Daniel Sand, Christina Thrandorf, Volker Paech, Peter Altmeyer, Falk G Bechara [CC BY 2.5https://creativecommons.org/licenses/by/2.5)],https://commons.wikimedia.org/wiki/File:Kaposi%27sSarcoma.jpg
- Photo courtesy: Yale Rosen from USA [CC BY-SA 2.0 https://creativecommons.org/licenses/by-sa/2.0)],https://commons.wikimedia.org/wiki/File:Kaposi_sarcoma_(3944996124).jpg
- Photo courtesy:Mohammad2018 [CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0)]https://commons.wikimedia.org/wiki/File:Kaposi_sarcoma_new_photo_to_help_in_diagnosis.jpg
- Photo Credit:Content Providers: CDC/ Dr. Steve Kraus [Public domain]https://commons.wikimedia.org/wiki/File:Kaposi%27s_sarcoma_lesion.jpg
- Photo Credit:OpenStax College [CC BY 3.0(https://creativecommons.org/licenses/by/3.0)]https://commons.wikimedia.org/wiki/File:Kaposis_Sarcoma_Lesions.jpg