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Determining the role of cytokines in UV-induced immunomodulation
Jeffrey P Walterscheid1, Dat X Nghiem, Stephen E Ullrich
1Department of Immunology, University of Texas, M.D. Anderson Cancer Center, Houston, TX 77030-4009, USA.
Abstract:
Ultraviolet radiation exposure damages DNA and promotes the development of skin cancer. In addition, UV exposure suppresses the immune response. Although the mechanism by which epidermal exposure to UV induces systemic immune suppression is not fully understood, it is clear that cytokines are involved. Therefore, quantitative measurement of cytokines is a critical aspect of modern research techniques. Determining the level of synthesis and secretion of cytokines in vivo or in vitro can be achieved through several possible techniques, depending on the sampling size, its physical state, and the type of answers required to test the hypothesis. When studying transcriptional activation, the level of cytokine mRNA is often determined using reverse transcription polymerase chain reaction (RT-PCR), ribonuclease protection assay (RPA), or Northern blot. Quantitative determinations of specific protein levels require a capture ELISA. As with any analytical technique, there are compromises among expense of sensitivity, labor, and time. These methods are discussed as they pertain to surveying cytokine induction and their relative usefulness to the laboratory scientist.
Insights
Ultraviolet radiation damages skin DNA and suppresses immunity. Measuring cytokine levels, crucial for understanding this immune suppression, can be done using techniques like RT-PCR and ELISA.
Area of Science:
- Immunology
- Molecular Biology
- Dermatology
Background:
- Ultraviolet (UV) radiation exposure is a known carcinogen, damaging DNA and promoting skin cancer development.
- UV exposure also induces systemic immune suppression, a mechanism not fully elucidated but involving cytokines.
- Cytokines play a critical role in mediating UV-induced immune responses and suppression.
Purpose of the Study:
- To review and discuss quantitative measurement techniques for cytokines in the context of UV radiation research.
- To highlight the importance of cytokine analysis in understanding UV-induced immune suppression.
- To compare the relative advantages and disadvantages of different cytokine detection methods for laboratory scientists.
Main Methods:
- Discusses methods for measuring cytokine mRNA levels, including reverse transcription polymerase chain reaction (RT-PCR), ribonuclease protection assay (RPA), and Northern blot.
- Explains the use of capture enzyme-linked immunosorbent assay (ELISA) for quantitative determination of specific cytokine protein levels.
- Considers factors influencing technique selection, such as sample size, physical state, and research questions.
Main Results:
- Various techniques exist for quantifying cytokine synthesis and secretion in vitro and in vivo.
- Each method presents trade-offs concerning sensitivity, cost, labor, and time.
- RT-PCR, RPA, and Northern blot are suitable for transcriptional analysis, while ELISA is used for protein quantification.
Conclusions:
- Quantitative measurement of cytokines is essential for researching UV-induced immune suppression and skin cancer.
- The choice of cytokine detection method depends on specific experimental needs and resource availability.
- Understanding these techniques aids laboratory scientists in effectively surveying cytokine induction.