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1

Rola osi ludzkiego insulinopodobnego czynnika wzrostu (IGF) w karcinogenezie

100%
Kwasniewski W., Kotarski J., Polak G., Gozdzicka-Jozefiak A., Kotarski J.
Postępy Biologii Komórki
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2013
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tom 40
|
nr 1
2

Stezenie insulinopodobnych czynnikow wzrostu IGF-I i IGF-II w surowicy zrebnych klaczy w okresie okoloimplantacyjnym

84%
Krakowski L., Wrona Z., Kostro K., Zdzisinska B.
Medycyna Weterynaryjna
|
2008
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tom 64
|
nr 02
237-239
In the reproduction of animals and humans, insulin-like factors (IGF-I , IGF-II) play a significant role. Among others, they stimulate growth of the ovarian follicle, embryo development, egg implantation and they inhibit cell apoptosis. In horses the implantation process and placenta development is partly regulated by IGF-I and IGF-II. Research was conducted on 18 mares during early pregnancy. The study has revealed the existence of some differences in the level of IGF-I and IGF-II. A significant increase of IGF-I in comparison to the preovulation period (311 ng/ml) was noted 12 h after ovulation (356 ng/ml), 72 h (328 ng/ml), 7 days (340 ng/ml) and at 35 (344 ng/ml) and at 55 (360 ng/ml) days of gestation. The concentration of IGF-II also increased but only at the 6th day after ovulation. The concentration of IGF-II before ovulation was 4.8 ng/ml and up until the 6 days after ovulation it ranged from 8.2 to 9.6 ng/ml. The differences in the levels of IGF-I and IGF-II before and after ovulation and during the pregnancy could result from the activation of an embryo genome and from the preparation of endometrium for implantation.
3

Wpływ przebiegu porodu na stężenie IGF-I w surowicy zimnokrwiostych klaczy i ich nowo narodzonych źrebiąt

84%
Kowalik S., Kedzierski W., Kusy R.
Medycyna Weterynaryjna
|
2015
|
tom 71
|
nr 07
Insulin-like growth factor I (IGF-I) is a polipeptyde hormone produced mainly by the liver in response to the endocrine growth hormone stimulus, but it is also secreted by multiple tissues for autocrine or paracrine purposes. IGF-I represents one of the most important growth regulators, playing a central role in fetal and neonatal growth. However, the role of IGF-I in the reproductive physiology of horses is still little known. Therefore, the aims of this work were 1) to evaluate the IGF-I serum concentration in mares during the first 4 days after parturition and in their newborn foals during the first 4 days of life, and 2) to determine whether the IGF-I concentration may be influenced by the type of parturition. Two groups of subjects were examined: 7 healthy mares and their foals born by spontaneous parturition (group F), and 10 healthy mares and their foals born by non-spontaneous parturition, requiring medical assistance (group P). From each animal, the first blood samples were collected within 30 min of birth, and then, daily, during 4 days after parturition. The samples were collected once a day at 8.00 a.m. IGF-I was analyzed by the radioimmunoassay method with the IGF-RIA-CT kit (BioSource, Belgium). The results revealed that the mares from the group P had a statistically significantly higher concentration of IGF-I compared with the mares from the group F (90.9 ± 7.02 vs. 40.9 ± 5.94 ng/ml, respectively, p ≤ 0.01). Similarly, the statistically higher values of this factor were found in the foals from the group P than in those from the group F (130 ± 8.59 vs. 83.1 ± 6.56 ng/ml, respectively, p ≤ 0.01). Furthermore, a positive correlation was found between the concentration of IGF-I in the blood serum of mares and their foals on the first day of the study (r = 0.50, p ≤ 0.05). In summary, disturbances in the course of parturition did not have a negative impact on the IGF-I level in either mares or their newborn foals.
4

IGF-I i inne czynniki wzrostu w nowotworach gruczołu sutkowego u psów i ludzi - ich rola w nowotworzeniu oraz znaczenie rokownicze

84%
Dolka I., Malicka E., Motyl T., Sapierzynski R.
Medycyna Weterynaryjna
|
2010
|
tom 66
|
nr 11
s.745-750,fot.,rys.,bibliogr.
The aim of this article is to summarize current data on the role of growth factors in the development of mammary tumors and their receptor expression as tumor markers. Particular attention is paid to IGF-I and IGF-IR in canine mammary tumors. The growth of a canine and human mammary cancer is regulated not only by sex steroid hormones but also by growth factors (GFs). Growth factors control such critical processes as the growth of the cell, differentiation, angiogenesis and apoptosis in a normal mammary gland. In malignancies these signaling pathways are often exploited to stimulate tumor growth and metastasis. In recent years there has been an increased understanding of aberrations in the insulin-like growth factor-I and its receptor (IGF-I, IGF-IR) responsible for or accompanying human and canine mammary carcinogenesis. IGF-IR demonstrates a tyrosine kinase activity and closely resembles the insulin receptor (IR) in structural as well as in signaling cascades. The binding of the ligands IGF-I or IGF-II to IGF-IR causes the phosphorylation of the IGF-IR tyrosine kinase rest located in the cytoplasmic portion of the β-subunit, then the Ras/ MAPK and PI-3K/Akt pathways associated with cell differentiation are activated and apoptosis is inhibited. IGF-IR is overexpressed in mammary tumor cells and has been implicated in tumor aggressiveness. IGF-IR expression contributes to cancer cell migration as well as cell-cell adhesion. The assessment of IGF-IR expression seems to be a significant indicator of prognosis. There are only a few studies on the role of IGF-I/IGF-IR in canine mammary neoplasms. Interestingly, the cross-talk between estrogens/ERα and IGF-I/IGF-IR has been demonstrated in breast cancer. Most in vitro studies demonstrate that estrogens and IGF-I have a synergistic effect on the proliferation of breast cancer cells. In the case of canine mammary tumors this potential relationship has not been thoroughly investigated, but it has been hypothesized that such a mechanism of cross-talk between sex hormones and the IGF-I pathway might promote carcinogenesis in an autocrine/paracrine manner. A further understanding of this mechanism could lead to the development of new therapeutic strategies in canine and human mammary neoplasms.
5

Rola osi hormon wzrostu - insulinopodobny czynnik wzrostowy typu-1 w starzeniu się organizmu

67%
Piotrowska K., Sluczanowska-Glabowska S., Staniszewska M., Banach B., Glabowski W., Laszczynska M., Ratajczak M. Z.
Postępy Biologii Komórki
|
2014
|
tom 41
|
nr 4
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