MiR-370 enhances cell cycle and represses lipid accumulation in porcine adipocytes

et al. 2020

Preprint

Background: Local Chinese local pig breeds have thinner muscle fiber and higher intramuscular-fat (IMF) content. But its regulation mechanism has not been discussed in-depth. Studies indicated that long non coding RNAs (lncRNAs) play important role in muscle and fat development.Results: The lncRNAs expressional differences in the longissimus dorsi (LD) muscle were identified between Huainan pigs (local Chinese pigs, fat-type, HN) and Large White pigs (lean-type, LW) at 38, 58, and 78 days post conception (dpc). In total, 2131 novel lncRNAs were identified in 18 samples, and 291, 305, and 683 differentially expressed lncRNAs (DELs) were found between these two breeds at three stages, respectively. GO and KEGG analysis of the DEL co expressed mRNAs showed that muscle development and energy metabolism were more active at 58 dpc in HN, but at 78 dpc in LW pigs. Muscle cell differentiation and myofibril assembly might associated with earlier myogenesis and primary-muscle-fiber assembly in HN, and cell proliferation, insulin, and the MAPK pathway might contribute to longer proliferation in LW pigs. The PI3K/Akt and cAMP pathways were associated with higher IMF deposition in HN. IMFlnc1 was selected for functional verification, and results indicated that it regulated the expressional level of caveolin-1 (CAV-1) by acting as competing endogenous RNA (ceRNA) to sponge miR-199a-5p.Conclusions: Our data contributed to understanding lncRNAs in porcine-muscle development and IMF deposition, and provided valuable information for improving pig-meat quality.

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

LncRNA IMFlnc1 Promotes Porcine Intramuscular Adipocyte Adipogenesis by Sponging Mir-199a-5p to Up-regulate CAV-1

et al. 2020

Preprint

“…was not only associated with the proliferation and differentiation of muscle cells, but also with the proliferation and adipogenesis of pre-adipocytes. Similarly, miR-370 was not only related to lipid metabolic homeostasis and lipid deposition, [44] but it also regulates muscle cell apoptosis [60]. MiR-149 promoted porcine satellite cell proliferation through the Notch signaling pathway [61], while miR-149-3p induced a subcutaneous-to-visceral fat switch by suppressing PR domain-containing 16 (PRDM16) [62].…”

Section: Discussionmentioning

confidence: 99%

LncRNA IMFlnc1 promotes porcine intramuscular adipocyte differentiation by sponging miR-199a-5p to up-regulate CAV-1

et al. 2020

Preprint

Background Local Chinese local pig breeds have better meat quality, such as thinner muscle fiber and higher intramuscular-fat (IMF) content. However, its molecular regulation mechanism has not been discussed in-depth. Studies indicated that long non coding RNAs (lncRNAs) participate in the regulation of muscle and fat development. The expressional differences of lncRNAs in the longissimus dorsi (LD) muscle were identified between Huainan pigs (local Chinese pigs, fat-type, HN) and Large White pigs (lean-type, LW) at 38, 58, and 78 days post conception (dpc).Results In total, 2131 novel lncRNAs were identified in 18 samples, and 291, 305, and 683 differentially expressed lncRNAs (DELs) were found between these two breeds at three stages, respectively. GO and KEGG analysis of the DEL co expressed mRNAs showed that muscle development and energy metabolism were more active at 58 dpc in HN, but at 78 dpc in LW pigs. Muscle cell differentiation and myofibril assembly might contribute to earlier myogenesis and primary-muscle-fiber assembly in HN, and cell proliferation, insulin, and the mitogen-activated protein kinase (MAPK) pathway might contribute to longer proliferation in LW pigs. The PI3K/Akt and cAMP pathways were associated with higher IMF deposition in HN. IMFlnc1 was selected for functional verification, and results indicated that it regulated the expressional level of caveolin-1 (CAV-1) as a competing endogenous RNA (ceRNA) for miR-199a-5p.Conclusion Our data contributed to understanding lncRNAs in porcine-muscle development and IMF deposition, and provided valuable information for improving pig-meat quality.

“…It also participates in the regulation of the metabolic difference between glycolytic and oxidative myo ber [36]. There are also several miRNAs associated with lipid metabolism in the ceRNA network, for example, miR-370 [37], miR-326 [38], miR-574-5p [39], and miR-296 [40].…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

LncRNA IMFlnc1 Promotes Porcine Intramuscular Adipocyte Adipogenesis by Sponging miR-199a-5p to Up-regulate CAV-1

et al. 2020

Preprint

Background: Local Chinese local pig breeds have thinner muscle fiber and higher intramuscular-fat (IMF) content. But its regulation mechanism has not been discussed in-depth. Studies indicated that long non coding RNAs (lncRNAs) play important role in muscle and fat development.Results: The lncRNAs expressional differences in the longissimus dorsi (LD) muscle were identified between Huainan pigs (local Chinese pigs, fat-type, HN) and Large White pigs (lean-type, LW) at 38, 58, and 78 days post conception (dpc). In total, 2131 novel lncRNAs were identified in 18 samples, and 291, 305, and 683 differentially expressed lncRNAs (DELs) were found between these two breeds at three stages, respectively. The mRNAs that co-expressed with these DELs were used for GO and KEGG analysis, and the results showed that muscle development and energy metabolism were more active at 58 dpc in HN, but at 78 dpc in LW pigs. Muscle cell differentiation and myofibril assembly might associated with earlier myogenesis and primary-muscle-fiber assembly in HN, and cell proliferation, insulin, and the MAPK pathway might be contribute to longer proliferation and elevated energy metabolism in LW pigs at 78 dpc. The PI3K/Akt and cAMP pathways were associated with higher IMF deposition in HN. Intramuscular fat deposition-associated long noncoding RNA 1 (IMFlnc1) was selected for functional verification, and results indicated that it regulated the expressional level of caveolin-1 (CAV-1) by acting as competing endogenous RNA (ceRNA) to sponge miR-199a-5p.Conclusions: Our data contributed to understanding the role of lncRNAs in porcine-muscle development and IMF deposition, and provided valuable information for improving pig-meat quality.