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CD28-CD80/CD86 interactions in testicular immunoregulation

S Sainio-Pöllänen¹, T Saari, O Simell

¹Department of Pediatrics, University of Turku, Finland. papepo@utu.fi

Journal of Reproductive Immunology

|October 1, 1996

Summary

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In normal mice testes, CD80 and CD86 are absent, preventing T cell activation. In diabetic NOD mice, these molecules appear, potentially allowing lymphocyte activation and influencing testicular immunoregulation.

Area of Science:

Immunology
Reproductive Biology

Background:

Antigen-presenting cells (APCs) express CD80/B7-1 and CD86/B7-2, crucial for T cell activation.
Testicular immune privilege involves mechanisms that suppress local immune responses.

Purpose of the Study:

To investigate the expression of CD80 and CD86 in the testes of normal and non-obese diabetic (NOD) mice.
To determine the effect of CD28 stimulation on the suppression of lymphocytes by testicular products.

Main Methods:

Immunohistochemical analysis of testicular tissue from BALB/c and NOD mice.
In vitro assays assessing lymphocyte proliferation in response to testicular extracts and CD28 stimulation.

Main Results:

CD80 and CD86 expressing cells were absent in young NOD and adult BALB/c mouse testes.

Related Experiment Videos

CD80+ and CD86+ cells were detected in older NOD mice testes, with varying CD11b/CD18 expression.

CD28 stimulation partially antagonized the inhibitory effect of testicular extracts on lymphocyte growth.

Conclusions:

T lymphocyte activation is inhibited in normal mouse testes due to the lack of CD80/CD86 ligands on APCs and immunosuppressive testicular factors.
The presence of CD80 and CD86 in older NOD mice testes may permit CD28 co-stimulation, potentially overcoming suppression and allowing lymphocyte activation.
These findings shed light on the complex testicular immunoregulation and the potential for altered immune responses in autoimmune diabetes.