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Developmental regulation of insulin-like growth factor-II/mannose 6-phosphate receptor mRNA in the rat
M Ballesteros1, C D Scott, R C Baxter
1Department of Endocrinology, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia.
Abstract:
This study examined levels of insulin-like growth factor-II/mannose 6-phosphate receptor (IGF-II/M6PR) mRNA in tissues of rats at different stages of growth. Northern blot analysis of total RNA from tissues of rats aged 2, 9, 21 and 42 days and from 21 day fetal rats was carried out using a cDNA probe to the IGF-II/M6PR. Northern blots showed this probe hybridized to a single 9kb band in all tissues tested. Highest hybridization signals were detected in fetal and neonatal tissues with levels rapidly decreasing after birth. For all age groups tested the highest signal was obtained with heart followed by muscle, lung, and kidney, with liver and brain showing lower levels of message. These results indicate that IGF-II/M6PR mRNA is developmentally regulated, and suggest a role for the IGF-II/M6PR in fetal and neonatal growth.
Insights
Insulin-like growth factor-II/mannose 6-phosphate receptor (IGF-II/M6PR) mRNA is highest in fetal and neonatal rat tissues. Its expression decreases after birth, suggesting a role in early growth and development.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- The insulin-like growth factor-II/mannose 6-phosphate receptor (IGF-II/M6PR) is crucial for cellular processes.
- Understanding its expression patterns is key to deciphering its role in growth.
Purpose of the Study:
- To investigate the developmental regulation of IGF-II/M6PR mRNA levels in rat tissues.
- To explore the potential role of IGF-II/M6PR in fetal and neonatal growth.
Main Methods:
- Northern blot analysis was used to quantify IGF-II/M6PR mRNA.
- Total RNA was extracted from fetal and postnatal rat tissues at various ages (2, 9, 21, 42 days).
- A cDNA probe specific to IGF-II/M6PR was employed for hybridization.
Main Results:
- A single 9kb band for IGF-II/M6PR mRNA was detected in all tested tissues.
- Expression levels were highest in fetal and neonatal tissues, declining sharply after birth.
- Heart tissue showed the highest signal, followed by muscle, lung, and kidney, with lower levels in liver and brain.
Conclusions:
- IGF-II/M6PR mRNA expression is developmentally regulated in rats.
- The findings suggest a significant role for IGF-II/M6PR in fetal and neonatal growth and development.