Early-age feed restriction affects viability and gene expression of satellite cells isolated from the gastrocnemius muscle of broiler chicks
© Li et al.; licensee BioMed Central Ltd. 2012
Received: 15 May 2012
Accepted: 1 November 2012
Published: 6 November 2012
Muscle growth depends on the fusion of proliferate satellite cells to existing myofibers. We reported previously that 0–14 day intermittent feeding led to persistent retardation in myofiber hypertrophy. However, how satellite cells respond to such nutritional insult has not been adequately elucidated.
One-day-old broiler chicks were allocated to control (Con, ad libitum feeding), intermittent feeding (IF, feed provided on alternate days) and re-feeding (RF, 2 days ad libitum feeding after 12 days of intermittent feeding) groups. Chickens were killed on Day 15 and satellite cells were isolated. When cultured, satellite cells from the IF group demonstrated significant retardation in proliferation and differentiation potential, while RF partly restored the proliferation rate and differentiation potential of the satellite cells. Significant up-regulation of insulin like growth factor I receptor (IGF-IR) (P< 0.05) and thyroid hormone receptor α (TRα) (P< 0.05), and down-regulation of growth hormone receptor (GHR) (P< 0.01) and IGF-I (P< 0.01) mRNA expression was observed in freshly isolated IF satellite cells when compared with Con cells. In RF cells, the mRNA expression of IGF-I was higher (P< 0.05) and of TRα was lower (P< 0.01) than in IF cells, suggesting that RF restored the mRNA expression of TRα and IGF-I, but not of GHR and IGF-IR. The Bax/Bcl-2 ratio tended to increase in the IF group, which was reversed in the RF group (P< 0.05), indicating that RF reduced the pro-apoptotic influence of IF. Moreover, no significant effect of T3 was detected on cell survival in IF cells compared with Con (P<0.001) or RF (P< 0.05) cells.
These data suggest that early-age feed restriction inhibits the proliferation and differentiation of satellite cells, induces changes in mRNA expression of the GH/IGF-I and thyroid hormone receptors in satellite cells, as well as blunted sensitivity of satellite cells to T3, and that RF partially reverses these effects. Thus, a moderate nutritional strategy for feed restriction should be chosen in early chick rearing systems.
KeywordsFeed restriction Satellite cells Proliferation Gene expression Chicken
Skeletal muscle accounts for 40–50% of body weight, and is the most important product for the poultry industry. Nutritional and metabolic exposure during critical periods of early development can have a long-term programming effect on health in adulthood. This “nutritional or metabolic programming” has been described not only in mammals[2–4], but also in avian species. A large number of studies have been done in chickens to investigate the long-term effect of early nutritional manipulation on body and muscle growth[3, 5]. Intermittent feeding, chickens fed ad libitum on one day and fasted on the other day, is one of the common strategies of feed restriction for higher feeding efficiency in the poultry industry in China. However, we found this kind of “feed restriction” could have a long-term negative influence in skeletal muscle growth if endured during the early growth period (0–14d).
As a source of nuclei for muscle growth, satellite cells must also be affected. Skeletal muscle growth in post-hatch birds is dictated by the accumulation of nuclei in muscle fibers and hypertrophy, the terminally differentiated myofibers are incapable of mitosis for myofiber accretion. Satellite cells are capable of entering the cell cycle to proliferate, differentiate and contribute nuclei to existing myofibers[6, 7]. In broilers, satellite cells demonstrate high activity in proliferation and differentiation 1 week post-hatch. After this, the satellite cell population declines dramatically[8, 9], although satellite cells retain mitotic activity as nuclei donors for myofiber hypertrophy. Therefore, the proliferative potential of satellite cells during the early post-hatch period would affect muscle hypertrophy in later life. The proliferative potential of satellite cells is highly sensitive to nutritional state. It has been shown that early post-hatch starvation decreases satellite cell proliferation and skeletal muscle growth in chicks and turkeys[10–12], which can be restored by re-feeding. Most previous studies focus on the first 2 or 3 days post-hatching, and only on the immediate effect after feed restriction. However, what happens during prolonged feed restriction such as 1 or 2 weeks after hatching and what are the differences between the immediate effects after fasting and after re-feeding, and how does satellite cell proliferation and differentiation respond to these situations. Moreover, proliferation and apoptosis (programmed cell death) together comprise normal cell growth regulation. Only the viability of the number of living cells (MTT assay) could reflect the ultimate balance between cell proliferation and apoptosis. The MTT assay measures cell survival and proliferation, although the classic methods for cell proliferation studies are more sensitive and accurate compared with the MTT assay.
Endocrine factors have been shown to be involved in the regulation of satellite cell proliferation[13–15]. Satellite cell proliferation was decreased in early post-hatch starved chicks paralleling lower growth hormone receptor gene expression. The activity of satellite cells was decreased during the first week of underfeeding in young sheep, which coincided with reduced muscle insulin like growth factor I (IGF-I) mRNA levels. In contrast, IGF-I gene expression was increased during long-term underfeeding causing muscle necrosis, suggesting activation of satellite cells for muscle repair. IGF-I also induced DNA synthesis in avian skeletal muscle satellite cells in vitro. This information suggests a role of growth hormone (GH)/IGF-I in mediating the effects of under-nutrition on satellite cell proliferation. How satellite cell GH receptor and IGF-I receptor expression responds to long-term early-age feed restriction has not been adequately elucidated.
Thyroid hormone (T3,T4) levels also reflect nutritional state and regulate cell proliferation in a dose-dependent manner. Satellite cells isolated from muscles of hypothyroid rats are less active in proliferation and differentiation at the start of culture. We reported previously that intermittent (skip a day) feeding the first 2 weeks after hatching caused a persistent decrease in serum levels of T3. However, little is known whether long-term early post-hatch underfeeding affects TRα mRNA expression in satellite cells or whether satellite cell responsiveness to T3in vitro is influenced.
Therefore, we have used satellite cells isolated from muscle of chickens subjected to nutritional intervention to investigate the impact of early-age feed restriction and re-feeding on proliferation/differentiation potentials, mRNA expression of relevant genes, as well as the responsiveness of satellite cells to T3.
Materials and methods
Animals and experimental design
One-day-old San Huang chicks (a crossbred local broiler breed) were allocated randomly to the control (Con, fed ad libitum), intermittent feeding (IF, fed ad libitum on alternate days for 14 days) and re-feeding (RF, 2 days ad libitum feeding after 12 days of intermittent feeding) groups (N = 10/group). The diets were formulated according to the nutritional requirements of the breed and all the chicks were raised under standard conditions recommended by the breeding company. Chickens were killed on Day 15 (feeding day for all 3 groups) and satellite cells were isolated from the lateral gastrocnemius muscle for RNA extraction and cell culture immediately. The experiment was repeated 3 times following the guidelines of the regional animal ethics committee.
Satellite cells were isolated from the lateral gastrocnemius muscles according to a protocol described by Doumit and Merkel with some modifications. Briefly, cells were dissociated by digestion with Pronase (1 g/L, Roche, Switzerland) and purified (to remove fibroblasts or other types of cells) by using Percoll (Sigma-Aldrich, Germany) gradient centrifugation[19, 20]. The isolated satellite cells were verified by Desmin antibody immunostaining (up to 98% desmin positive). The satellite cells from 10 chickens pooled as one sample for cell culture. A total of 30 chickens for each group were used, and the samples for cell culture were 3 per group.
For proliferation/differentiation analysis, satellite cells from 3 different groups were plated immediately after Percoll purification at 5×104 cells/cm2 in DMEM supplemented with 10% horse serum and 10% fetal bovine serum (FBS) (standard serum-rich medium), and maintained at 37°C in a humidified incubator containing 95% air and 5% CO2. Cell viability was assessed by the MTT (Sigma-Aldrich, Germany) assay. Briefly, cells were seeded at 104 cells per well in a 96-well plate and incubated in 200 μL medium for 1, 2, or 3 days, 6 wells for each group and each day. This was followed by adding 25 μL of the MTT solution (5 mg/mL; Sigma-Aldrich, Germany), while cells were protected from light. After 4 h incubation, under standard conditions of 5% CO2 and 37°C, the purple formazan product became visible. The precipitated formazan was dissolved by adding 100 μL dimethyl sulfoxide (DMSO) and placing it on a shaker for 5 minutes. An increase in cell number results in an increase in the amount of MTT formazan formed and an increase in absorbance. The absorbance was read on ELISA plate reader at 570 nm. The blank values (medium) were subtracted from each well of the untreated and treated cells. Morphological changes of cultured cells were also observed and photographed for 3 days to reflect cell proliferation and differentiation capacity.
For the T3 treatment, cells from the different groups were dispersed immediately after Percoll purification with DMEM supplemented with 10% horse serum, 10% FBS, plated in 96-well plates at an initial density of 104 cells per well, and allowed to attach overnight. Then cells were rendered quiescent in DMEM supplemented with 1% FBS (low serum medium) for 24 h[23, 24]. Satellite cells from the different groups were treated and grown with or without 2×10-8 M 3′,3′,5′-triiodo-L-thyronine (T3, Sigma-Aldrich, Germany) in basal medium (low serum medium) (according to the literature and our preliminary experiment). Cell viability was measured by the MTT assay at 24 h after T3 treatment.
RNA extraction, reverse transcription (RT) and real-time PCR
Nucleotide sequences of specific primers and real-time PCR conditions for satellite cells
GenBank accession no.
F: 5′- tgcgtgacatcaaggagaag −3′
R: 5′- tgccagggtacattgtggta −3′
F: 5′- aacgaggacacttacttcaccaca −3′
R: 5′- gcatttccatacttggggtttct −3′
F: 5′- gcagaggagagtgaggtggaa −3′
R: 5′- gtaaaaggctggagatgggaga −3′
F: 5′- tgtgctccaataaagccacct −3′
R:5′- tttctgtttcctgtgttccctctac −3′
R: 5′- gttgtgtttgcggtagttgatgtag −3′
F: 5′- gccccccgcctcaccatg −3′
R: 5′- cccggggtgagccatggtttc −3′
F: 5′- acagggtttcatccaggatcgagca-3′
R: 5′- tcagcttcttggtggacgcatc −3′
The results were expressed as the Mean ± SEM. All data were subjected to one-way ANOVA analysis testing the main effect of the treatment. When the main effect of treatment was significant, statistical differences of the means were assessed by least-significant difference. P<0.05 was considered significant. All statistical analyses were performed with SPSS11.0 for Windows (StatSoft Inc., USA).
Proliferation and differentiation of satellite cells
Abundance of relevant gene transcripts in satellite cells
Responsiveness of satellite cells to T3
Previous studies regarding the nutritional influences on satellite cells have been focused on the changes of cell mitotic activity by determining DNA synthesis with incorporation of either 3H]thymidine[8, 10] or BrdU[8, 11, 12, 27]. Pax7 is also used as a specific marker for satellite cells in immunohistochemistry. These are classic methods for cell proliferation studies, which are more sensitive and accurate compared with the MTT assay. However, normal cell growth regulation not only includes proliferation but also apoptosis (programmed cell death). The MTT assay is a convenient and efficient method for establishing the number of living cells (viability), reflecting the ultimate balance between cell proliferation and apoptosis. Here, the morphological differences of the satellite cells revealed the significant impact of early-age intermittent feeding on cell proliferation and differentiation, while the changes in the ratio of Bax to Bcl-2 mRNA expression implicated changes of apoptotic potential of the satellite cells responding to nutrition restriction and restoration. This implies some strategies of feed restriction for higher feeding efficiency should be appropriately (for example, fasted one day per three days) and duly (for example, fasted at an older age). If not, the total number of satellite cells will be less for full muscle growth.
We found that 2 days re-feeding after 12 days of intermittent feeding was unable to restore completely the proliferation and differentiation capabilities of the satellite cells, as indicated by the cell morphology and viability detected with the MTT assay. This result adds to the previous findings that several days of re-feeding was able to completely reverse the depressed mitotic activity of the satellite cell caused by short-term (2–3 days) feed deprivation or fasting in chicks or turkeys[10, 12, 27, 28]. A delayed peak of satellite cell DNA synthesis and mitotic activity was observed after 2–3 days of re-feeding in chicks and 3 days re-feeding in young turkeys, which allows a complete restoration of satellite cell numbers. Difference in fasting strategies should take into account this divergence. For those starter diet withdrawal treatments, the fasting only lasted 2 or 3 days after hatching, when yolk residue still serves as an energy resource. It is possible that intermittent (skip a day) feeding for 2 weeks after hatching is more stringent compared with the short-term fasting in other studies, 2 days of re-feeding was not sufficient for restoring satellite cell numbers. Another possibility is the critical window during early post-hatch development for satellite cell proliferation. The first week after hatching is considered as the most active period for satellite cell proliferation and differentiation. Re-feeding occurring within this period may be more effective for a complete compensation, compared with the delayed re-feeding in this study. The most dramatic change in satellite cell activity may occur within the first week, yet the decreased satellite cell activity observed on Day 15 in this study reflects the cumulative effects of intermittent feeding in the first 2 weeks of post-hatch life. This also implicates a suited period for feed restriction and re-feeding that should be considered.
Previous findings have shown a role for apoptosis in muscle induced by under-nutrition[28–30], so here we also tested the expressions of apoptotic regulatory factors, Bax, a death-promoting molecule, and Bcl-2, a survival protein, in extracted satellite cells to explore the survival of them in different feed treatments[31, 32]. We noticed in our previous research that early feed restriction decreased the mRNA expression of Bcl-2 and increased the ratio of Bax mRNA/Bcl-2 mRNA in gastrocnemius muscle tissue at the end of 14 days of early-age feed restriction, but there was no difference in the evaluation of DNA ladder electrophoresis (data not published). However, no changes were found here in the mRNA levels of Bcl-2 and Bax in satellite cells of the three feed treatment groups, and there was no difference in Bax/Bcl-2 ratio between the RF and Con groups. It may be that the 14 days of alternate fasting did not induce apoptosis obviously or exhibited in these factors. We found a down-regulation of Bax/Bcl-2 ratio in the RF group compared with the IF group, suggesting satellite cell apoptosis was repressed by restoration of nutrition during re-feeding.
It is suggested that the GH/IGF-I system mediates the effect of nutritional state on satellite cells. Feed restriction induces a significant fall in circulating IGF-I[34, 35] and a rise in plasma GH, which could be restored to the normal levels by re-feeding. We reported previously that IF chickens expressed lower IGF-I and higher IGF-IR mRNA in the gastrocnemius muscle on Day 14. Satellite cells isolated from the muscle showed similar responses with lower GHR, IGF-1 and higher IGF-IR mRNA expression in the IF group. It was suggested that in chickens after hatching, hepatic gene expression of IGF-I is GH-dependent while muscular gene expression of IGF-I is independent of GH and GHR. However, it is unknown whether IGF-I expression in satellite cells is dependent on GHR. Here, expression of GHR and IGF-I in satellite cells exhibited a similar pattern in response to feed restriction and re-feeding, suggesting a possible regulatory link between these two genes.
The role of the GH/IGF-I axis in the regulation of avian muscle growth remains obscure. Growth hormone can promote skeletal muscle satellite cell proliferation in vitro[13, 14] and in vivo[40, 41], and modify GHR expression[13, 14]. Satellite cell proliferation was decreased in starved chicks along with a lower GHR gene expression, which were reversed with re-feeding. IGF-I stimulates the proliferation, and fusion of satellite cells in vitro[42–46]. However, IGF-I together with GH in culture showed no enhancement effect on DNA synthesis in chicken satellite cells. Since both myofibers and satellite cells are able to produce IGF-I, the effects of paracrine and autocrine IGF-I on satellite cell activity have to be considered, in addition to the role of endocrine IGF-I. Recently, mechano growth factor E (MGF-E), derived from an isoform of IGF-I, was reported to activate human muscle progenitor cells.
In addition to the GH/IGF system, thyroid hormones were suggested to be involved in mediating the effect of nutrition on satellite cell function[15, 49]. Subcutaneous injections of T4 in rats would stimulate the number of total satellite cells and satellite cells per muscle fiber, while satellite cell numbers extracted from the hypothyroid rats were fewer and less active in proliferation and differentiation at the start of culture. However, it is unclear how expression of the thyroid hormone receptor in satellite cells responds to nutritional status and thyroid hormone levels. We reported previously that serum concentrations of both T3 and T4 decreased with IF for 14 days in chicks. We observed a significant up-regulation of TRα mRNA expression in the IF group, which was completely restored with re-feeding. This up-regulation of TRα mRNA expression in satellite cells may represent a feedback regulation through decreased serum thyroid hormone levels. However, the TRα mRNA expression in satellite cells was not coinciding with the viability of satellite cells (Figures 2 and3). It is speculated that the thyroid hormone receptor activity, which determines the sensitivity of the satellite cells to T3, may be blunted. This speculation was supported in the T3 challenge test for satellite cells from the three different groups (Figure 5). Satellite cells from the IF group were insensitive to T3 while re-feeding partly restored the responsiveness of satellite cells to T3, although the viabilities were still significantly lower compared with the Con group at both basal and T3-stimulated conditions. It is likely that the up-regulation of TRα mRNA expression in the IF group represents a feedback mechanism of disrupted signaling of thyroid hormones on satellite cells.
In conclusion, long-term feed restriction (12–14 days of intermittent feeding) immediately after hatching impairs proliferation and differentiation capabilities of satellite cells, which could not be completely restored by 2 days of re-feeding. The disrupted satellite cell viability was associated with alterations in mRNA expression of the GH, IGF-I and thyroid hormone receptors, as well as the blunted sensitivity of satellite cells to T3. Therefore, the persistent retardation in myofiber hypertrophy caused by 14 days of intermittent feeding post-hatching reported previously can be explained by the decreased satellite cell proliferation and differentiation activity, lower serum T3 levels and the blunted sensitivity of satellite cells to T3. This suggests that long-term IF carried too early after hatching is not an ideal strategy for poultry meat production. RF partially reverses these effects, which indicates a moderate nutritional strategy for feed restriction if implemented early post-hatching.
This work was supported by the National Nature Science Foundation of China (Project No. U0931004) and the Sino-German Cooperation in Agriculture (Project No. 28/04-05CHN7 2010–2011).
- Demmelmair H, von Rosen J, Koletzko B: Long-term consequences of early nutrition. Early Hum Dev. 2006, 82: 567-574. 10.1016/j.earlhumdev.2006.07.004.View ArticlePubMedGoogle Scholar
- Langley-Evans SC, Bellinger L, McMullen S: Animal models of programming: early life influences on appetite and feeding behaviour. Matern Child Nutr. 2005, 1: 142-148. 10.1111/j.1740-8709.2005.00015.x.View ArticlePubMedGoogle Scholar
- de Moura EG, Passos MC: Neonatal programming of body weight regulation and energetic metabolism. Biosci Rep. 2005, 25: 251-269. 10.1007/s10540-005-2888-3.View ArticlePubMedGoogle Scholar
- Wu G, Bazer FW, Wallace JM, Spencer TE: Board-invited review: intrauterine growth retardation: implications for the animal sciences. J Anim Sci. 2006, 84: 2316-2337. 10.2527/jas.2006-156.View ArticlePubMedGoogle Scholar
- Li Y, Yuan L, Yang X, Ni Y, Xia D, Barth S, Grossmann R, Zhao RQ: Effect of early feed restriction on myofibre types and expression of growth-related genes in the gastrocnemius muscle of crossbred broiler chickens. Br J Nutr. 2007, 98: 310-319. 10.1017/S0007114507699383.View ArticlePubMedGoogle Scholar
- Campion DR: The muscle satellite cell: a review. Int Rev Cytol. 1984, 87: 225-251.View ArticlePubMedGoogle Scholar
- Vierck J, O’Reilly B, Hossner K: Satellite cell regulation following myotrauma caused by resistance exercise. Cell Biol Int. 2000, 24: 263-272. 10.1006/cbir.2000.0499.View ArticlePubMedGoogle Scholar
- Halevy O, Geyra A, Barak M, Uni Z, Sklan D: Early posthatch starvation decreases satellite cell proliferation and skeletal muscle growth in chicks. J Nutr. 2000, 130: 858-864.PubMedGoogle Scholar
- Halevy O, Krispin A, Leshem Y, McMurtry JP, Yahav S: Early-age heat exposure affects skeletal muscle satellite cell proliferation and differentiation in chicks. Am J Physiol Regul Integr Comp Physiol. 2001, 281: R302-R309.PubMedGoogle Scholar
- Halevy O, Nadel Y, Barak M, Rozenboim I, Sklan D: Early posthatch feeding stimulates satellite cell proliferation and skeletal muscle growth in turkey poults. J Nutr. 2003, 133: 1376-1382.PubMedGoogle Scholar
- Mozdziak PE, Walsh TJ, McCoy DW: The effect of early posthatch nutrition on satellite cell mitotic activity. Poult Sci. 2002, 81: 1703-1708.View ArticlePubMedGoogle Scholar
- Moore DT, Ferket PR, Mozdziak PE: The effect of early nutrition on satellite cell dynamics in the young turkey. Poult Sci. 2005, 84: 748-756.View ArticlePubMedGoogle Scholar
- Halevy O, Hodik V, Mett A: The effects of growth hormone on avian skeletal muscle satellite cell proliferation and differentiation. Gen Comp Endocrinol. 1996, 101: 43-52. 10.1006/gcen.1996.0006.View ArticlePubMedGoogle Scholar
- Hodik V, Mett A, Halevy O: Mutual effects of growth hormone and growth factors on avian skeletal muscle satellite cells. Gen Comp Endocrinol. 1997, 108: 161-170. 10.1006/gcen.1997.6964.View ArticlePubMedGoogle Scholar
- Cassar-Malek I, Langlois N, Picard B, Geay Y: Regulation of bovine satellite cell proliferation and differentiation by insulin and triiodothyronine. Domest Anim Endocrinol. 1999, 17: 373-388. 10.1016/S0739-7240(99)00055-7.View ArticlePubMedGoogle Scholar
- Jeanplong F, Bass JJ, Smith HK, Kirk SP, Kambadur R, Sharma M, Oldham JM: Prolonged underfeeding of sheep increases myostatin and myogenic regulatory factor Myf-5 in skeletal muscle while IGF-I and myogenin are repressed. J Endocrinol. 2003, 176: 425-437. 10.1677/joe.0.1760425.View ArticlePubMedGoogle Scholar
- Jacobs SC, Bar PR, Bootsma AL: Effect of hypothyroidism on satellite cells and postnatal fiber development in the soleus muscle of rat. Cell Tissue Res. 1996, 286: 137-144. 10.1007/s004410050682.View ArticlePubMedGoogle Scholar
- Doumit ME, Merkel RA: Conditions for isolation and culture of porcine myogenic satellite cells. Tissue Cell. 1992, 24: 253-262. 10.1016/0040-8166(92)90098-R.View ArticlePubMedGoogle Scholar
- Mau M, Oksbjerg N, Rehfeldt C: Establishment and conditions for growth and differentiation of a myoblast cell line derived from the semimembranosus muscle of newborn piglets. In Vitro Cell Dev Biol Anim. 2008, 44: 1-5.View ArticlePubMedGoogle Scholar
- Grant AL, Helferich WG, Merkel RA, Bergen WG: Effects of phenethanolamines and propranolol on the proliferation of cultured chick breast muscle satellite cells. J Anim Sci. 1990, 68: 652-658.PubMedGoogle Scholar
- Chen Y, Wang K, Zhu DH: Isolation, culture, identification and biological characteristics of chicken skeletal muscle satellite cells. Yi Chuan. 2006, 28: 257-260.View ArticlePubMedGoogle Scholar
- Xu P, Gu X: The effects of EGF, TGF-beta and insulin on the growth of rabbit’s skeletal muscle satellite cell. Zhonghua Kou Qiang Yi Xue Za Zhi. 2000, 35: 289-291.PubMedGoogle Scholar
- Barandier C, Montani JP, Yang Z: Mature adipocytes and perivascular adipose tissue stimulate vascular smooth muscle cell proliferation: effects of aging and obesity. Am J Physiol Heart Circ Physiol. 2005, 289: H1807-H1813. 10.1152/ajpheart.01259.2004.View ArticlePubMedGoogle Scholar
- Wang BH, Ouyang JP, Liu YM, Zheng HQ, Wei L, Yang JW, Li K, YANG HL: Effects of thyroid hormone on the myosin heavy chain mRNA expression in cardiac myocytes induced by angiotensin II. Chin J Pathophysiol. 2003, 19: 1463-1467.Google Scholar
- Nakashima K, Ohtsuka A, Hayashi K: Effects of thyroid hormones on myofibrillar proteolysis and activities of calpain, proteasome, and cathepsin in primary cultured chick muscle cells. J Nutr Sci Vitaminol (Tokyo). 1998, 44: 799-807. 10.3177/jnsv.44.799.View ArticleGoogle Scholar
- Livak KJ, Schmittgen TD: Analysis of relative gene expression data using real-time quantitative PCR and the 2(−Delta Delta C(T)) Method. Methods. 2001, 25: 402-408. 10.1006/meth.2001.1262.View ArticlePubMedGoogle Scholar
- Moore DT, Ferket PR, Mozdziak PE: Early post-hatch fasting induces satellite cell self-renewal. Comp Biochem Physiol A Mol Integr Physiol. 2005, 142: 331-339. 10.1016/j.cbpa.2005.08.007.View ArticlePubMedGoogle Scholar
- Mozdziak PE, Evans JJ, McCoy DW: Early posthatch starvation induces myonuclear apoptosis in chickens. J Nutr. 2002, 132: 901-903.PubMedGoogle Scholar
- Nunes VA, Gozzo AJ, Juliano MA, Cesar MC, Sampaio MU, Sampaio CA: Antioxidant dietary deficiency induces caspase activation in chick skeletal muscle cells. Braz J Med Biol Res. 2003, 36: 1047-1053.View ArticlePubMedGoogle Scholar
- Pophal S, Evans JJ, Mozdziak PE: Myonuclear apoptosis occurs during early posthatch starvation. Comp Biochem Physiol B Biochem Mol Biol. 2003, 135: 677-681. 10.1016/S1096-4959(03)00148-9.View ArticlePubMedGoogle Scholar
- Salakou S, Kardamakis D, Tsamandas AC, Zolota V, Apostolakis E, Tzelepi V, Papathanasopoulos P, Bonikos DS, Papapetropoulos T, Petsas T, Dougenis D: Increased Bax/Bcl-2 ratio up-regulates caspase-3 and increasesapoptosis in the thymus of patients with myasthenia gravis. In Vivo. 2007, 21: 123-132.PubMedGoogle Scholar
- Chang HK, Shin MS, Yang HY, Lee JW, Kim YS, Lee MH, Kim J, Kim KH, Kim CJ: Amygdalin induces apoptosis through regulation of Bax and Bcl-2expressions in human DU145 and LNCaP prostate cancer cells. Biol Pharm Bull. 2006, 29: 1597-1602. 10.1248/bpb.29.1597.View ArticlePubMedGoogle Scholar
- Oksbjerg N, Gondret F, Vestergaard M: Basic principles of muscle development and growth in meat-producing mammals as affected by the insulin-like growth factor (IGF) system. Domest Anim Endocrinol. 2004, 27: 219-240. 10.1016/j.domaniend.2004.06.007.View ArticlePubMedGoogle Scholar
- Leili S, Buonomo FC, Scanes CG: The effects of dietary restriction on insulin-like growth factor (IGF)-I and II, and IGF-binding proteins in chickens. Proc Soc Exp Biol Med. 1997, 216: 104-111.View ArticlePubMedGoogle Scholar
- Morishita D, Sasaki K, Wakita M, Hoshino S: Effect of fasting on serum insulin-like growth factor-I (IGF-I) levels and IGF-I-binding activity in cockerels. J Endocrinol. 1993, 139: 363-370. 10.1677/joe.0.1390363.View ArticlePubMedGoogle Scholar
- Kuhn ER, Herremans M, Dewil E, Vanderpooten A, Rudas P, Bartha T, Verheyen G, Berghman L, Decuypere E: Thyrotropin-releasing hormone (TRH) is not thyrotropic but somatotropic in fed and starved adult chickens. Reprod Nutr Dev. 1991, 31: 431-439. 10.1051/rnd:19910409.View ArticlePubMedGoogle Scholar
- Kita K, Tomas FM, Owens PC, Knowles SE, Forbes BE, Upton Z, Hughes R, Ballard FJ: Influence of nutrition on hepatic IGF-I mRNA levels and plasma concentrations of IGF-I and IGF-II in meat-type chickens. J Endocrinol. 1996, 149: 181-190. 10.1677/joe.0.1490181.View ArticlePubMedGoogle Scholar
- Tanaka M, Hayashida Y, Sakaguchi K, Ohkubo T, Wakita M, Hoshino S, Nakashima K: Growth hormone-independent expression of insulin-like growth factor I messenger ribonucleic acid in extrahepatic tissues of the chicken. Endocrinology. 1996, 137: 30-34. 10.1210/en.137.1.30.PubMedGoogle Scholar
- Buyse J, Decuypere E: The role of the somatotrophic axis in the metabolism of the chicken. Domest Anim Endocrinol. 1999, 17: 245-255. 10.1016/S0739-7240(99)00041-7.View ArticlePubMedGoogle Scholar
- Levesque HM, Shears MA, Fletcher GL, Moon TW: Myogenesis and muscle metabolism in juvenile Atlantic salmon (Salmo salar) made transgenic for growth hormone. J Exp Biol. 2008, 211: 128-137. 10.1242/jeb.006890.View ArticlePubMedGoogle Scholar
- Ullman M, Oldfors A: Skeletal muscle regeneration in young rats is dependent on growth hormone. J Neurol Sci. 1991, 106: 67-74. 10.1016/0022-510X(91)90196-E.View ArticlePubMedGoogle Scholar
- Dodson MV, McFarland DC, Grant AL, Doumit ME, Velleman SG: Extrinsic regulation of domestic animal-derived satellite cells. Domest Anim Endocrinol. 1996, 13: 107-126. 10.1016/0739-7240(95)00062-3.View ArticlePubMedGoogle Scholar
- Florini JR, Ewton DZ, Coolican SA: Growth hormone and the insulin-like growth factor system in myogenesis. Endocr Rev. 1996, 17: 481-517.PubMedGoogle Scholar
- Palmer RM, Thompson MG, Knott RM, Campbell GP, Thom A, Morrison KS: Insulin and insulin-like growth factor-I responsiveness and signalling mechanisms in C2C12 satellite cells: effect of differentiation and fusion. Biochim Biophys Acta. 1997, 1355: 167-176. 10.1016/S0167-4889(96)00127-9.View ArticlePubMedGoogle Scholar
- Rousse S, Montarras D, Pinset C, Dubois C: Up-regulation of insulin-like growth factor binding protein-5 is independent of muscle cell differentiation, sensitive to rapamycin, but insensitive to wortmannin and LY294002. Endocrinology. 1998, 139: 1487-1493. 10.1210/en.139.4.1487.PubMedGoogle Scholar
- McFarland DC, Pesall JE, Gilkerson KK: The influence of growth factors on turkey embryonic myoblasts and satellite cells in vitro. Gen Comp Endocrinol. 1993, 89: 415-424. 10.1006/gcen.1993.1049.View ArticlePubMedGoogle Scholar
- Vasilatos-Younken R: Absence of growth hormone-induced avian muscle growth in vivo. Poult Sci. 1999, 78: 759-768.View ArticlePubMedGoogle Scholar
- Kandalla PK, Goldspink G, Butler-Browne G, Mouly V: Mechano Growth Factor E peptide (MGF-E), derived from an isoform of IGF-1, activates human muscle progenitor cells and induces an increase in their fusion potential at different ages. Mech Ageing Dev. 2011, 132: 154-162. 10.1016/j.mad.2011.02.007.View ArticlePubMedGoogle Scholar
- Marchal S, Cassar-Malek I, Pons F, Wrutniak C, Cabello G: Triiodothyronine influences quail myoblast proliferation and differentiation. Biol Cell. 1993, 78: 191-197. 10.1016/0248-4900(93)90129-3.View ArticlePubMedGoogle Scholar
- Beermann DH, Liboff M, Wilson DB, Hood LF: Effects of exogenous thyroxine and growth hormone on satellite cell and myonuclei populations in rapidly growing rat skeletal muscle. Growth. 1983, 47: 426-436.PubMedGoogle Scholar
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.