Browsing by Author "Kannangai, Rajesh"

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    Chemokine profile among human immunodeficiency virus-1 (HIV-1) infected individuals from southern India.
    (2008-02-12) Ramalingam, Sandeep; Kannangai, Rajesh; Abraham, O C; Subramanian, Swaminathan; Rupali, Priscilla; Pulimood, S A; Jesudason, Mary V; Sridharan, Gopalan
    BACKGROUND & OBJECTIVE: Individuals infected with HIV-1 have higher levels of chemokine producing cells compared to uninfected individuals. It is important to know the changes in chemokine levels associated with rate of progression of disease. There is a paucity of information on the plasma chemokines in HIV-1 infected individuals from India. We therefore carried out this study to estimate the levels of three chemokines namely macrophage inflammatory protein alpha (MIP1alpha), MIP1beta and RANTES, in relation to disease status in HIV-1 infected individuals and compared with uninfected individuals. METHODS: RANTES and MIP1alpha were estimated using ELISA in 114 HIV-1 infected and 30 controls, whereas MIP1beta was estimated in 101 HIV infected individuals only and 30 controls. The values were compared to the T cell subsets, HIV-1 viral loads and plasma cytokines (interferon gamma and interleukin-10). RESULTS: Compared to controls the mean MIP1alpha and RANTES level among the HIV-1 infected individuals was higher while MIP1beta level was lower in HIV infected individuals except CDC C groups. There was a significant positive correlation for MIP1á with HIV-1 viral load and IFNgamma, for MIP1alpha with viral load and IL10. There was a significant negative correlation between MIP1alpha with CD4 count and CD4: CD8 ratio and MIP1beta with CD4 count and CD8 count. There was a negativecorrelation between RANTES values and CD8 per cent. INTERPRETATION & CONCLUSION: In conclusion, our study showed a significantly higher level of beta chemokines in south Indian HIV-1 infected individuals compared to controls. These beta chemokines may have the inhibitory effect on HIV-1 only during the initial period and with the progression of disease this inhibitory effect wanes as shown by the positive correlation of beta chemokines with HIV-1 viral load.
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    Increased number of CCR5+ CD4 T cells among south Indian adults probably associated with the low frequency of X4 phenotype of HIV-1 in India.
    (2002-09-07) Ramalingam, Sandeep; Kannangai, Rajesh; Vijayakumar, Theophilus S; Subramanian, Swaminathan; Abraham, Oriapadickal C; Rupali, Priscilla; Jesudason, Mary V; Sridharan, Gopalan
    BACKGROUND & OBJECTIVE: The shift of the human immunodeficiency virus (HIV) from nonsyncytium inducing strains (NSI/R5) to syncytium inducing strains (SI/X4) seen in subtype B infections during progression to acquired immunodeficiency syndrome (AIDS) is less frequently reported in subtype C. NSI and SI strains differ in the co-receptor they utilize to infect a T-cell. We postulated that a larger pool of CD4 T cells expressing CCR5 would be present among individuals in the Indian population. To validate this hypothesis, we estimated the percentage of CD4 cells expressing CCR5 or CXCR4 molecules among healthy south Indian adults and HIV infected individuals. METHODS: HIV-1 infected and uninfected adult volunteers, belonging to the four southern states of India with Tamil/Malayalam/Kannada or Telugu as their spoken language were prospectively recruited. A two colour flowcytometry examination of the blood sample was done using the following monoclonals; anti-CD45 (FITC)/CD14 (PE), anti IgG1 (FITC)/IgG2a (PE), anti-CD3 (FITC)/CD4 (PE), anti-CD3 (FITC)/CD8 (PE), anti-CD4 (FITC) and anti CCR5 (PE) or anti CXCR4 (PE). RESULTS: In the healthy population (n = 30) studied, 24.6 per cent of CD4 T cells expressed CCR5 and the percentage of CD4 T cells expressing CXCR4 was 80.4. Among the HIV infected individuals (n = 51) the percentage of CD4 T cells expressing CCR5 and CXCR4 was 26.8 and 78.7 per cent respectively. INTERPRETATION & CONCLUSION: The percentage of CD4 cells expressing CCR5 and CXCR4 in both the HIV uninfected and infected adults was significantly higher in the south Indian population than in the West. The larger pool of CCR5 positive CD4 cells probably allows for the R5 HIV strain to have a replication advantage over X4 HIV strains. This may explain the lack of shift in the viral phenotype during disease progression and also the perceived rapid progression of the disease in India compared to the West.
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    Investigation of apoptotic markers among human immunodeficiency virus (HIV-1) infected individuals.
    (2008-12-28) Ramalingam, Sandeep; Kannangai, Rajesh; Abraham, O C; Subramanian, Swaminathan; Rupali, Priscilla; Pulimood, S A; Jesudason, M V; Sridharan, Gopalan
    BACKGROUND & OBJECTIVES: Apoptosis causes a decline in the counts of uninfected bystander CD4+ T cells in HIV infection. The rate of disease progression of HIV infection is considered to be faster in the developing countries. The present study was carried out to investigate certain markers for apoptosis in immunopathogensis of disease in HIV infected south Indian population. METHODS: Soluble Fas (sFas) antigen and Fas ligand levels in plasma samples from 39 antiretroviral treatment naïve patients was estimated and compared with T cell subsets and HIV-1 viral load. RESULTS: The mean sFas antigen levels among controls and the CDC A, B and C clinical stages were 2.77, 3.08, 3.26 and 3.28 ng /ml respectively, higher though not significantly among HIV-1 infected individuals compared to controls. The mean sFas ligand levels in CDC A, B and C stages were 0.138, 0.125 and 0.117 ng/ml respectively were higher (P<0.001) than controls (0.073 ng/ml) and positively correlated with total lymphocyte % (r=0.43, P =0.007). sFas antigen levels were negatively correlated with total WBC count (r=-0.34, P=0.04), CD4% (r=-0.4, P=0.01) and CD4:CD8 ratio (r=-0.37, P=0.02). There was an increase in plasma levels of sFas antigen and Fas ligand over time in asymptomatics. INTERPRETATION & CONCLUSION: The high levels of sFas antigen and Fas ligand seen in HIV infected individuals suggest increased activation and apoptosis of T cells, due to constant stimulation of the immune system by inter-current infections of HIV infected individuals in south India.
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    A pilot study on the seroprevalence of parvovirus B19 infection.
    (2002-04-21) Abraham, Mary; Rudraraju, Rajeev; Kannangai, Rajesh; George, Koshy; Cherian, Thomas; Daniel, Dolly; Ramalingam, Sandeep; Sridharan, Gopalan
    BACKGROUND & OBJECTIVES: Human parvovirus B 19 (PVB 19) causes aplastic crisis in children with congenital haemolytic anaemia, erythema infectiosum, abortion and stillbirth. Since data on PVB 19 prevalence is lacking in India, a pilot study was undertaken to estimate the prevalence of IgG antibody in children and adults. METHODS: The samples were obtained from children attending our hospital and from volunteer blood donors, majority of whom were from south India. They included 45 children aged 1-5 yr, 39 aged 6-10 yr, 42 aged 11-15 yr and 100 healthy blood donors > 15 yr of age. Sera were tested for the presence of antibody to PVB 19 using a commercial enzyme immuno assay (EIA). RESULTS: Of 226 samples tested, 113 (50%) were positive for PVB 19 IgG. The prevalence of antibody increased from 8.9 per cent at 1-5 yr to 70 per cent in those > 15 yr: the median age of infection was between 6 and 15 yr. Sex and domiciliary status did not have significant effect on the prevalence of antibody. The IgG antibody index increased significantly with age, suggesting repeated exposure to the virus. INTERPRETATION & CONCLUSION: This seroprevalence study indicates that large numbers of individuals show exposure to PVB 19 virus. The exposure as indicated by IgG positivity is seen to increase with age. The IgG negative individuals may be considered to be at risk of developing infections due to PVB 19.
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    Role of polymerase chain reaction in the diagnosis of Trichomonas vaginalis infection in human immunodeficiency virus-infected individuals from India (South).
    (2012-05) Paul, Hema; Peter, Dincy; Pulimood, Susanne A; Abraham, Oriapadickal Cherian; Mathai, Elezabeth; Prasad, Jasmine H; Kannangai, Rajesh
    Background: Trichomonas vaginalis is a protozoan parasite and an etiological agent for trichomoniasis, a sexually transmitted infection (STI). Fifty to eighty percentage of women with trichomoniasis are asymptomatic and in the absence of treatment the infection persists longer. Aim: To evaluate the role of polymerase chain reaction (PCR) in the diagnosis of trichomoniasis and also to look at the frequency of infection among human immunodeficiency virus (HIV) infected women. Methods: A non-nested PCR was standardized to detect 102 bp size amplified product of the adhesin gene of T. vaginalis. The real time performance of this assay was performed with vaginal swab samples from 198 HIV-seropositive women who attended the infectious disease clinic and compared with wet mount and culture in Diamond's modified media. Results: Among the prospectively studied 198 HIV-infected women, 1 (0.51%) was positive by wet mount, 6 (3.03%) were positive by culture and 10 (5.02%) were positive by the PCR. There was a significant observed agreement between the PCR and culture (k=0.74, Z=10.7, P<0.0000). Conclusion: Our study showed that the PCR assay for the amplification of adhesion gene is a highly sensitive method to screen the high risk group individuals like HIV-positive women for Trichomonas vaginalis compared to the culture. Testing algorithm should be, wet mount and if negative, test by PCR as it is rapid compared to culture which takes 7 days.