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Weinrauch AM, Fehrmann F, Anderson WG. Sustained endocrine and exocrine function in the pancreas of the Pacific spiny dogfish post-feeding. FISH PHYSIOLOGY AND BIOCHEMISTRY 2022; 48:645-657. [PMID: 35411445 DOI: 10.1007/s10695-022-01070-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 03/25/2022] [Indexed: 06/14/2023]
Abstract
Secretions of the exocrine pancreas contain digestive enzymes integral to the digestive process. The Pacific spiny dogfish (Squalus suckleyi) has a discrete pancreas, divided into two lobes termed the dorsal and ventral lobes. These lobes drain into the anterior intestine via a common duct to enable digestion. Previous studies have identified that the exocrine pancreas produces (co)lipases, chymotrypsin, carboxypeptidase, and low levels of chitinases; however, investigations into other digestive enzymes are limited. We detect the presence of lipase, trypsin, and carbohydrase and show that activities are equivalent between both lobes of the pancreas. Additionally, we sought to investigate the influence of a single feeding event (2% body weight ration of herring by gavage) on enzyme activities over an extended time course (0, 20, 48, 72, 168 h) post-feeding. The results indicate that there are no differences in pancreatic tissue digestive enzyme activities between fed or fasted states. Analysis of acinar cell circumference post-feeding demonstrates a significant increase at 20 and 48 h, that returns to fasting levels by 72 h. No significant changes were observed regarding whole-tissue insulin or glucagon mRNA abundance or with glucose transporter (glut) 1 or 3. Yet, a significant and transient decrease in glut4 and sodium glucose-linked transporter mRNA abundance was found at 48 h post-feeding. We propose that the constant enzyme activity across this relatively large organ, in combination with a relatively slow rate of digestion leads to an evenly distributed, sustained release of digestive enzymes regardless of digestive state.
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Affiliation(s)
- Alyssa M Weinrauch
- Department of Biological Sciences, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada.
- Bamfield Marine Sciences Centre, Bamfield, BC, V0R 1B0, Canada.
| | - Frauke Fehrmann
- Department of Biological Sciences, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
| | - W Gary Anderson
- Department of Biological Sciences, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
- Bamfield Marine Sciences Centre, Bamfield, BC, V0R 1B0, Canada
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Zhang G, Li J, Zhang J, Liang X, Zhang X, Wang T, Yin S. Integrated Analysis of Transcriptomic, miRNA and Proteomic Changes of a Novel Hybrid Yellow Catfish Uncovers Key Roles for miRNAs in Heterosis. Mol Cell Proteomics 2019; 18:1437-1453. [PMID: 31092672 PMCID: PMC6601203 DOI: 10.1074/mcp.ra118.001297] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2018] [Revised: 04/09/2019] [Indexed: 01/14/2023] Open
Abstract
Heterosis is a complex biological phenomenon in which hybridization produces offspring that exhibit superior phenotypic characteristics compared with the parents. Heterosis is widely utilized in agriculture, for example in fish farming; however, its underlying molecular basis remains elusive. To gain a comprehensive and unbiased molecular understanding of fish heterosis, we analyzed the mRNA, miRNA, and proteomes of the livers of three catfish species, Pelteobagrus fulvidraco, P. vachelli, and their hybrid, the hybrid yellow catfish "Huangyou-1" (P. fulvidraco ♀ × P. vachelli ♂). Using next-generation sequencing and mass spectrometry, we show that the nonadditive, homoeolog expression bias and expression level dominance pattern were readily identified at the transcriptional, post-transcriptional, or protein levels, providing the evidence for the widespread presence of dominant models during hybridization. A number of predicted miRNA-mRNA-protein pairs were found and validated by qRT-PCR and PRM assays. Furthermore, several diverse key pathways were identified, including immune defense, metabolism, digestion and absorption, and cell proliferation and development, suggesting the vital mechanisms involved in the generation of the heterosis phenotype in progenies. We propose that the high parental expression of genes/proteins (growth, nutrition, feeding, and disease resistance) coupled with low parental miRNAs of the offspring, are inherited from the mother or father, thus indicating that the offspring were enriched with the advantages of the father or mother. We provide new and important information about the molecular mechanisms of heterosis, which represents a significant step toward a more complete elucidation of this phenomenon.
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Affiliation(s)
- Guosong Zhang
- From the ‡College of Marine Science and Engineering, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China;; §Key Laboratory for Physiology Biochemistry and Application, School of Agriculture and Bioengineering, Heze University, Heze, Shandong 274015, China
| | - Jie Li
- From the ‡College of Marine Science and Engineering, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China;; ¶Co-Innovation Center for Marine Bio-Industry Technology, Lian Yungang, 222005, China
| | - Jiajia Zhang
- From the ‡College of Marine Science and Engineering, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China;; ¶Co-Innovation Center for Marine Bio-Industry Technology, Lian Yungang, 222005, China
| | - Xia Liang
- §Key Laboratory for Physiology Biochemistry and Application, School of Agriculture and Bioengineering, Heze University, Heze, Shandong 274015, China
| | - Xinyu Zhang
- From the ‡College of Marine Science and Engineering, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China;; ¶Co-Innovation Center for Marine Bio-Industry Technology, Lian Yungang, 222005, China
| | - Tao Wang
- From the ‡College of Marine Science and Engineering, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China;; ¶Co-Innovation Center for Marine Bio-Industry Technology, Lian Yungang, 222005, China
| | - Shaowu Yin
- From the ‡College of Marine Science and Engineering, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China;; ¶Co-Innovation Center for Marine Bio-Industry Technology, Lian Yungang, 222005, China.
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Kotrschal A, Corral-Lopez A, Szidat S, Kolm N. The effect of brain size evolution on feeding propensity, digestive efficiency, and juvenile growth. Evolution 2015; 69:3013-20. [PMID: 26420573 PMCID: PMC5057322 DOI: 10.1111/evo.12784] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 08/20/2015] [Accepted: 09/17/2015] [Indexed: 11/29/2022]
Abstract
One key hypothesis in the study of brain size evolution is the expensive tissue hypothesis; the idea that increased investment into the brain should be compensated by decreased investment into other costly organs, for instance the gut. Although the hypothesis is supported by both comparative and experimental evidence, little is known about the potential changes in energetic requirements or digestive traits following such evolutionary shifts in brain and gut size. Organisms may meet the greater metabolic requirements of larger brains despite smaller guts via increased food intake or better digestion. But increased investment in the brain may also hamper somatic growth. To test these hypotheses we here used guppy (Poecilia reticulata) brain size selection lines with a pronounced negative association between brain and gut size and investigated feeding propensity, digestive efficiency (DE), and juvenile growth rate. We did not find any difference in feeding propensity or DE between large- and small-brained individuals. Instead, we found that large-brained females had slower growth during the first 10 weeks after birth. Our study provides experimental support that investment into larger brains at the expense of gut tissue carries costs that are not necessarily compensated by a more efficient digestive system.
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Affiliation(s)
| | | | - Sönke Szidat
- Department of Chemistry and Biochemistry, University of Bern, Switzerland
| | - Niclas Kolm
- Department of Ethology/Zoology, Stockholm University, Sweden
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