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Developmental expression of a candidate müllerian inhibiting substance type II receptor
1Pediatric Surgical Research Laboratory, Massachusetts General Hospital, Boston 02114, USA.
Abstract:
We have isolated a candidate Müllerian inhibiting substance (MIS) type II receptor complementary DNA from an embryonic rat urogenital ridge library and have studied its binding to MIS, its developmental pattern of expression and tissue distribution. By in situ hybridization with a full-length riboprobe, the receptor is expressed in the mesenchymal cells surrounding the Müllerian duct at embryonic days 14, 15, and 16 and in tubular and follicular structures of the rat fetal gonads. Expression of the messenger RNA was also seen in the granules cells and seminiferous tubules of pubertal gonads. Northern analysis revealed that the MIS type II receptor messenger RNA is highly expressed in embryonic, pubertal, and adult testes and ovaries, as well as in the gravid uterus. The timing of expression in the gonads of both sexes was also analyzed by Northern analyses that showed high levels of expression at the time of Müllerian duct regression, much lower levels neonatally and prepubertally and then increased expression again with sexual maturation. The tissue and developmental specificity of expression of this receptor, which make it likely that this is the functional MIS type II receptor, can be used to advantage in therapeutic targeting strategies and to decipher the function of MIS in the gonads.
Insights
Researchers identified a Müllerian inhibiting substance (MIS) type II receptor in rats. Its specific expression pattern in gonads suggests a key role in sexual development and potential for therapeutic targeting.
Area of Science:
- Reproductive Biology
- Developmental Biology
- Molecular Endocrinology
Background:
- Müllerian inhibiting substance (MIS) plays a crucial role in male reproductive tract development by inhibiting the Müllerian duct.
- The MIS type II receptor is hypothesized to mediate MIS signaling, but its precise function and expression patterns require further elucidation.
Purpose of the Study:
- To isolate and characterize a candidate Müllerian inhibiting substance (MIS) type II receptor complementary DNA from embryonic rat urogenital ridge.
- To investigate the binding affinity of the identified receptor to MIS.
- To determine the developmental expression pattern and tissue distribution of the MIS type II receptor.
Main Methods:
- Isolation of complementary DNA from an embryonic rat urogenital ridge library.
- In situ hybridization using a full-length riboprobe to assess spatial expression.
- Northern blot analysis to evaluate messenger RNA expression levels across different developmental stages and tissues.
Main Results:
- A candidate MIS type II receptor complementary DNA was successfully isolated.
- The receptor exhibits specific expression in mesenchymal cells surrounding the Müllerian duct during embryonic development.
- Expression is also observed in fetal and pubertal gonads, gravid uterus, and shows dynamic changes correlating with Müllerian duct regression and sexual maturation.
Conclusions:
- The identified receptor displays tissue and developmental specificity, strongly suggesting it is the functional MIS type II receptor.
- This finding provides a valuable tool for understanding MIS function in gonadal development.
- The receptor's expression pattern offers potential for targeted therapeutic strategies in reproductive medicine.