Inverse correlation between insulin-like growth factor (IGF)-binding protein-5 and IGF-I and II during postnatal development of the anterior pituitary gland.
نویسندگان
چکیده
BACKGROUND The insulin-like growth factor (IGF) system is important for pituitary development and control, with each member of this axis having a specific temporal and spatial expression. Because IGF-binding protein-5 (IGFBP-5) is one of the most highly expressed binding proteins in the anterior pituitary (AP), it might be of special importance in this gland. OBJECTIVE The purpose of this study was to examine the temporal relationship between the expression of the IGFs and IGFBP-5 in the AP during postnatal development. DESIGN AND METHODS Quantitative reverse transcription polymerase chain reaction was used to study the mRNA levels of these proteins in the AP of male and female rats at 10, 20, 30, 40 and 60 days of age. RESULTS The highest mRNA levels of IGF-I and II occurred at 10 and 20 days of age with a dramatic decrease at 30 days (p < 0.0001). IGF-I, but not IGF-II, mRNA levels increased again during adulthood (60 days). The pattern of IGFBP-5 mRNA was inversely expressed, with maximum values occurring at 40 days. IGF-I mRNA levels were higher in males at 10 days, but higher in females at 20 days. The expression of IGF-II was higher in males both at 10 and 20 days. IGFBP-5 gene expression was higher in females at 40 days. CONCLUSION The dramatic changes in the expression of IGF-I, IGF-II and IGFBP-5 throughout postnatal development suggest that these factors play important roles in the development of this gland and that their actions are highly interrelated.
منابع مشابه
Investigation on the Levels of IGF-I Receptor and IGF-I Binding Protein I in the Brain of Insulin Resistant Rats
Abstract Introduction: There is limited knowledge available on the metabolism of glucose in the brain, an insulin insensitive organ. Insulin receptors hybridize with insulin like growth factor receptor (IGF-I) to transduce the signals in different areas of the brain. In this article we aimed at investigating whether the expression of IGF-I receptor and IGF-I binding proteins (IGFBP1) is change...
متن کاملBrain-derived neurotrophic factor, insulin-like growth factor-I and its binding protein responses to a session of endurance exercise in healthy elderly men
Purpose: This study investigated the effect of endurance activity on brain-derived neurotrophic factor(BDNF), insulin-like growth factor 1(IGF-1) and its binding protein 3(IGFBP-3) in elderly healthy individuals. Materials and Methods: Eleven healthy old males (mean age of 68 ± 2.31 years old, height of 177 ± 3.1 cm and weight of 79 ± 1.5 kg) were studied. Seventy two hours after maxi...
متن کاملP-64: The Relationship between Polymorphism in Gene of Insulin-Like Growth Factor-I and The Serum Periparturient Concentration in Holstein Dairy Cows
Background: One of the most important metabolic factors affecting the reproductive activity is insulin-like growth factor-I (IGFI) concentration changes after calving. Recently, Maj et al. (2008) discovered a significant association between the IGF-I genotypes based on the 5'-untranslatedregion (5'-UTR) of IGF-I gene and the IGF-I blood level. The objective of this study is to investi...
متن کاملThe insulin-like growth factors (IGF) and IGF type I receptor during postnatal growth of the murine mammary gland: sites of messenger ribonucleic acid expression and potential functions.
The goals of this study were to determine the cellular sites of insulin-like growth factor (IGF) and IGF type-I receptor (IGF-IR) expression and to begin to elucidate functional roles for the IGFs during postnatal development of the murine mammary gland. Using in situ hybridization analyses, we determined that IGF-I, IGF-II, and IGF-IR messenger RNAs were expressed in the highly proliferative t...
متن کاملEffects of prenatal ethanol exposure on postnatal growth and the insulin-like growth factor axis.
AIMS To study the effect of in-utero alcohol exposure on the insulin-like growth factor axis (IGF) and leptin during infancy and childhood, considering that exposed children may exhibit pre- and postnatal growth retardation. METHODS We prospectively identified heavily drinking pregnant women who consumed on average 4 or more drinks of ethanol per day (≥ 48 g/day) and assessed growth in 69 of ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Hormone research
دوره 57 1-2 شماره
صفحات -
تاریخ انتشار 2002