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[Relationship between human herpesvirus 6 infection and idiopathic thrombocytopenic purpura]
Objective:
To investigate the pathogenic role of human herpesvirus 6 (HHV-6) in idiopathic thrombocytopenic purpura (ITP).
Methods:
HHV-6 DNA was examined by polymerase chain reaction (PCR) in bone marrow mononuclear cells (BMMNC) of 105 ITP patients. Human cytomegalovirus (HCMV) and parvovirus B(19) DNA were also examined in some cases. Platelet-associated antibodies (PAIg) were measured by competitive ELISA in 66 ITP patients. Serum IgG titer to HHV-6 was observed by indirect immunofluorescence assay in 19 ITP patients.
Results:
(1) HHV-6 DNA positivity was 41.0% for ITP patients, significantly higher than that for control group (P < 0.05). HHV-6 DNA positivity for adult ITP patients, especially adult chronic cases was significantly higher than that for childhood patients (P < 0.025). Positivities for parvovirus B(19) and HCMV DNA were 24.1% and 9.7%, respectively. (2) HHV-6 DNA positivity for patients with abnormal level of PAIgG was significantly higher than that for patients with normal level of PAIgG (P < 0.05). (3) Patients coinfected with HHV-6 and B(19) or HCMV had more severe symptoms or poorer prognosis.
Conclusion:
HHV-6 infection might be associated with excessive PAIgG. Coinfection with HHV-6, B(19) or HCMV may cause more severe symptoms in ITP patients.
Insights
Human herpesvirus 6 (HHV-6) DNA was detected in 41% of idiopathic thrombocytopenic purpura (ITP) patients, suggesting a potential role in the condition and its severity, especially with co-infections.
Area of Science:
- Virology
- Immunology
- Hematology
Context:
- Idiopathic thrombocytopenic purpura (ITP) is an autoimmune bleeding disorder.
- The role of viral infections in ITP pathogenesis remains an area of active investigation.
- Human herpesvirus 6 (HHV-6) is a common virus with potential immunomodulatory effects.
Purpose:
- To investigate the pathogenic role of human herpesvirus 6 (HHV-6) in idiopathic thrombocytopenic purpura (ITP).
- To assess the correlation between HHV-6 infection and platelet-associated antibodies (PAIgG) in ITP patients.
- To examine the impact of co-infections with other viruses on ITP severity.
Summary:
- HHV-6 DNA was detected in 41.0% of ITP patients, significantly higher than controls.
- HHV-6 DNA positivity was notably higher in adult chronic ITP cases compared to childhood ITP.
- A significant association was found between HHV-6 DNA positivity and abnormal levels of platelet-associated IgG (PAIgG).
- Co-infection with HHV-6 and parvovirus B(19) or human cytomegalovirus (HCMV) was linked to more severe symptoms and poorer prognosis.
Impact:
- Findings suggest HHV-6 infection may contribute to ITP pathogenesis, potentially through increased PAIgG production.
- Co-infections with HHV-6, B(19), or HCMV may exacerbate ITP symptoms and negatively influence patient outcomes.
- This research highlights the importance of considering viral etiologies in ITP management.