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Role of CD4 Receptor in Diagnosis of AIDS

This study was aimed to determine the Role of CD4 receptor in diagnosis of AIDS. Twenty apparently normal human subjects and 100 cases of different kinds of HIV /AIDS were included in this study. Their age ranged between below 29 to above 59 years. All these subjects were selected from Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, India. Blood samples were collected from these volunteers in the sterilized vials and processed for CD4 Count using flow cytometry. Data were analyzed with statistical package (SPSS 16.0) software. Results were presented in simple tables with frequencies. Mean age in both case and control groups are having slightly difference. Most of the CD4 +ve patients in the age less than 29 years while CD4-ve in age between 29-39 years. Females are more common among case group while males among control group. Most of the positive cases have CD4 cell count between 200-500. CD4 cell count ranged from 467.23 ± 291.34 (Group I(cases)), 716.15 ± 288.22 (Group II(control)). Statistically, this difference among groups was significant (p<0.05). The Age group distribution mean comparison of two groups was significant (p<0.05) in age group (Less than 29). There is a strong relationship between CD4 cell count values and Viral load (R=0.837). The Gender wise mean comparison of viral load in CD4 positive patients was found significant (p<0.05). The study helps in early detection and monitoring of HIV. A viral load test measures how much human immunodeficiency virus is in the blood. Measuring the CD4 count by flow cytometry method to disease progression for HIV


Introduction
CD4 is a co-receptor that assists the T cell receptor (TCR) in communicating with an antigen-presenting cell. CD4 also interacts directly with MHC class II molecules on the surface of the antigenpresenting cell using its extracellular domain [1].
HIV-1 uses CD4 to gain entry into host T-cells and achieves this through its viral envelope protein known as gp120 [2]. The binding to CD4 creates a shift in the conformation of gp120 allowing HIV-1 to bind to a co-receptor expressed on the host cell. These co-receptors are chemokine receptors CCR5 or CXCR4. Following a structural change in another viral protein (gp41), HIV inserts a fusion peptide into the host cell that allows the outer membrane of the virus to fuse with the cell membrane.
HIV infection leads to a progressive reduction in the number of T cells expressing CD4 [3]. Medical professionals refer to the CD4 count to decide when to begin treatment during HIV infection. Normal blood values are usually expressed as the number of cells per microliter (or cubic millimeter, mm 3 ) of blood, with normal values for CD4 cells being 500-1200 cells/mm 3 . A CD4 count measures the number of T cells expressing CD4. While CD4 counts are not a direct HIV test-e.g. they do not check the presence of viral DNA, or specific antibodies against HIV-they are used to assess the immune system of a patient. Patients often undergo treatments when the CD4 counts reach a level of 350 cells per microliter in Europe but usually around

Materials and Methods
Twenty apparently normal human subjects and 100 cases of different kinds of HIV /AIDS were included in this study. Their age ranged between below 29 to above 59 years. All these subjects were selected from Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, India. Blood samples were collected from these volunteers in the sterilized vials and processed for CD4 Count using flow cytometry as given in Figure 1. Data were analyzed with statistical package (SPSS16.0) software. Results were presented in simple tables with frequencies and percentages while statistical significance was taken to be p value ≤0.05.

Results
In the present study all the parameter was investigated in the subjects of normal control and HIV patients. Mean age in both groups are having slightly difference in both groups and the median value is same in both groups (Table 1).
Frequency distribution of Age intervals according to CD4 positivity in case groups are summarized in Figure 2. Statistically, this percentage difference among groups was not significant (p>0.05).
Frequency distribution of Age intervals according to CD4 positive patients in different CD4 cell count categories in cases groups are summarized in Table 2.
Frequency distributions of Gender in both groups are summarized in Table 3. Statistically, this percentage difference among groups was significant (p<0.05).
Frequency distribution of Gender according to CD4 positivity in cases group is summarized in Table 4. Statistically, this percentage difference among groups was significant (p<0.05).
Frequency distribution of Gender according to CD4 positive patients according to CD4 cell count categories in cases group are summarized in Figure 3.
Frequency distribution of Gender with age category according to CD4 positive patients in cases group are summarized in Table  5. Statistically, this percentage difference among groups was not significant (p>0.05).
The Gender wise mean comparison of two groups is summarized in Table 7. Statistically, this difference among groups was significant (p<0.05) in male and female.
The Age group distribution mean comparison of two groups is summarized in Table 8. Statistically, this difference among groups was significant (p<0.05) in age group (Less than 29).
The Table 9 reports the strength of the relationship between the CD4 cell count and the dependent variable viral load. R, the multiple correlation coefficients, is the linear correlation between the observed and predicted values of the dependent variable viral load. Its large value indicates a strong relationship between CD4 cell count values and Viral load (R=0.837). If R value is small then it takes large errors. For R square 0.701, nearly one third the variation in viral load is explained by the independent variable cd4 cell count.
The ANOVA table reports a significant F statistic (F value=166.71; P value = <0.001) consider extremely significant.
The Gender wise mean comparison of viral load in CD4 positive patients of treatment group are summarized in Table 10. Statistically, this difference between males and females was found significant (p<0.05).       Applied unpaired t test for significance, *Significant.

Discussion
Most of the CD4 +ve patients in the age less than 29 years while CD4-ve in age between 29-39 years. Most of the positive cases have CD4 cell count between 200-500. These findings are consistent with other study carried out by Balogun et al. [5].
Females are more common among case group while males among control group. CD4 cell count ranged from 467.23 ± 291.34 (Group I(cases)), 716.15 ± 288.22 (Group II(control)) similar to the study carried by Bussmann et al. [6].
There is a strong link between increases in viral load and CD4 cell count loss in HIV-infected patients similar to other study carried out by Carter et al. [7].
The Gender wise mean comparison of viral load in CD4 positive patients was found significant.

Conclusion
The study helps in early detection and monitoring of HIV. A viral load test measures how much human immunodeficiency virus is in the blood. Measuring the CD4 count by flow cytometry method to disease progression for HIV.