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Lendvai ÁZ, Tóth Z, Mahr K, Pénzes J, Vogel-Kindgen S, Gander BA, Vágási CI. IGF-1 induces sex-specific oxidative damage and mortality in a songbird. Oecologia 2024:10.1007/s00442-024-05587-y. [PMID: 39014256 DOI: 10.1007/s00442-024-05587-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Accepted: 06/28/2024] [Indexed: 07/18/2024]
Abstract
The insulin-like growth factor 1 (IGF-1) is a pleiotropic hormone that regulates essential life-history traits and is known for its major contribution to determining individual ageing processes. High levels of IGF-1 have been linked to increased mortality and are hypothesised to cause oxidative stress. This effect has been observed in laboratory animals, but whether it pertains to wild vertebrates has not been tested. This is surprising because studying the mechanisms that shape individual differences in lifespan is important to understanding mortality patterns in populations of free-living animals. We tested this hypothesis under semi-natural conditions by simulating elevated IGF-1 levels in captive bearded reedlings, a songbird species with an exceptionally fast pace of life. We subcutaneously injected slow-release biodegradable microspheres loaded with IGF-1 and achieved a systemic 3.7-fold increase of the hormone within the natural range for at least 24 h. Oxidative damage to lipids showed marked sexual differences: it significantly increased the day after the manipulation in treated males and returned to baseline levels four days post-treatment, while no treatment effect was apparent in females. Although there was no overall difference in survival between the treatment groups, high initial (pre-treatment) IGF-1 and low post-treatment plasma malondialdehyde levels were associated with enhanced survival prospects in males. These results suggest that males may be more susceptible to IGF-1-induced oxidative stress than females and quickly restoring oxidative balance may be related to fitness. IGF-1 levels evolve under opposing selection forces, and natural variation in this hormone's level may reflect the outcome of individual optimization.
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Affiliation(s)
- Ádám Z Lendvai
- Department of Evolutionary Zoology and Human Biology, University of Debrecen, Debrecen, Hungary.
| | - Zsófia Tóth
- Department of Evolutionary Zoology and Human Biology, University of Debrecen, Debrecen, Hungary
- Pál Juhász-Nagy Doctoral School of Biology Environmental Sciences, University of Debrecen, Debrecen, Hungary
- Department of Biology, Lund University, Lund, Sweden
| | - Katharina Mahr
- Department of Interdisciplinary Life Sciences, University of Veterinary Medicine, Konrad Lorenz Institute of Ethology, Vienna, Austria
| | - Janka Pénzes
- Evolutionary Ecology Group, Hungarian Department of Biology and Ecology, Babeş-Bolyai University, Cluj-Napoca, Romania
| | | | - Bruno A Gander
- Institute of Pharmaceutical Sciences, ETH Zurich, Zurich, Switzerland
| | - Csongor I Vágási
- Department of Evolutionary Zoology and Human Biology, University of Debrecen, Debrecen, Hungary
- Evolutionary Ecology Group, Hungarian Department of Biology and Ecology, Babeş-Bolyai University, Cluj-Napoca, Romania
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2
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Baghdassarian HM, Lewis NE. Resource allocation in mammalian systems. Biotechnol Adv 2024; 71:108305. [PMID: 38215956 PMCID: PMC11182366 DOI: 10.1016/j.biotechadv.2023.108305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 12/17/2023] [Accepted: 12/18/2023] [Indexed: 01/14/2024]
Abstract
Cells execute biological functions to support phenotypes such as growth, migration, and secretion. Complementarily, each function of a cell has resource costs that constrain phenotype. Resource allocation by a cell allows it to manage these costs and optimize their phenotypes. In fact, the management of resource constraints (e.g., nutrient availability, bioenergetic capacity, and macromolecular machinery production) shape activity and ultimately impact phenotype. In mammalian systems, quantification of resource allocation provides important insights into higher-order multicellular functions; it shapes intercellular interactions and relays environmental cues for tissues to coordinate individual cells to overcome resource constraints and achieve population-level behavior. Furthermore, these constraints, objectives, and phenotypes are context-dependent, with cells adapting their behavior according to their microenvironment, resulting in distinct steady-states. This review will highlight the biological insights gained from probing resource allocation in mammalian cells and tissues.
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Affiliation(s)
- Hratch M Baghdassarian
- Bioinformatics and Systems Biology Graduate Program, University of California, San Diego, La Jolla, CA 92093, USA; Department of Pediatrics, University of California, San Diego, La Jolla, CA 92093, USA
| | - Nathan E Lewis
- Department of Pediatrics, University of California, San Diego, La Jolla, CA 92093, USA; Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093, USA.
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3
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Vasilieva NA, Savinetskaya LE, Tchabovsky AV. Juvenile survival curves in a solitary ground squirrel with a prolonged hibernation: effects of individual characteristics, environment, and maternal investment. Curr Zool 2024; 70:13-23. [PMID: 38476132 PMCID: PMC10926259 DOI: 10.1093/cz/zoac097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 11/26/2022] [Indexed: 03/14/2024] Open
Abstract
Juvenile survival is a key life-history influence on population dynamics and adaptive evolution. We analyzed the effects of individual characteristics, early environment, and maternal investment on juvenile survival in a large solitary hibernating rodent-yellow ground squirrel Spermophilus fulvus using Cox mixed-effects models. Only 48% of weaned pups survived to dispersal and 17% survived to hibernation. Early life expectancy was primarily determined by individual characteristics and, to a lesser extent, by the early environment. The strongest and positive predictor of juvenile survival was body mass which crucially affected mortality immediately after weaning. Males suffered higher mortality than females after the onset of dispersal; however, the overall difference between sexes was partly masked by high rates of mortality in the first days after emergence in both sexes. Later emerged juveniles had lower life expectancy than the earliest pups. The overall effect of local juvenile density was positive. Prolonged lactation did not enhance juvenile survival: Pups nursed longer survived shorter than the young nursed for a shorter period. Our findings support the hypothesis that females of S. fulvus cannot effectively regulate maternal expenditures to mitigate the effects of unfavorable conditions on their offspring. The strategy to deal with seasonal time constraints on life history in female S. fulvus suggests an early termination of maternal care at the cost of juvenile quality and survival. This female reproductive strategy corresponds to a "fast-solitary" life of folivorous desert-dwelling S. fulvus and other solitary ground squirrels with prolonged hibernation.
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Affiliation(s)
- Nina A Vasilieva
- A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow 119071, Russia
| | - Liudmila E Savinetskaya
- A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow 119071, Russia
| | - Andrey V Tchabovsky
- A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow 119071, Russia
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4
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Montoya B, Torres R, Hernández A, Alejandro V. IGF-1 Levels Increase during an Immune but Not an Oxidative Challenge in an Avian Model, the Japanese Quail. Physiol Biochem Zool 2023; 96:450-457. [PMID: 38237191 DOI: 10.1086/728771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2024]
Abstract
AbstractInsulin-like growth factor 1 (IGF-1) is positively linked with growth and reproduction but negatively linked with survival, so a potential role of IGF-1 in modulating life history trade-offs has been proposed. However, the underlying mechanisms of the negative link between IGF-1 and survival are not yet clear, and oxidative stress has been proposed as a candidate. Immune activation is one important source of oxidative stress, and both immune activation and oxidative stress are known to reduce survival. We experimentally administrated an immune or oxidative insult to Japanese quails to evaluate whether oxidative stress is a proximate cost of holding elevated IGF-1 levels during a life challenge (e.g., infection, intoxication). IGF-1 levels increased in the presence of the immune insult, but they were not affected by the oxidative insult. Hence, IGF-1 may be linked to the survival costs of activating an immune response, but oxidative stress might not be directly involved as an underlying mechanism.
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5
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Lodjak J, Boonekamp J, Lendvai ÁZ, Verhulst S. Short- and long-term effects of nutritional state on IGF-1 levels in nestlings of a wild passerine. Oecologia 2023; 203:27-35. [PMID: 37676486 PMCID: PMC10615909 DOI: 10.1007/s00442-023-05445-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Accepted: 08/23/2023] [Indexed: 09/08/2023]
Abstract
Growth trajectories of young animals are intimately connected to their fitness prospects, but we have little knowledge of growth regulation mechanisms, particularly in the wild. Insulin-like growth factor 1 (IGF-1) is a central hormone in regulating resource allocation, with higher IGF-1 levels resulting in more growth. IGF-1 levels generally increase in conjunction with nutritional state, but whether IGF-1 levels are adjusted in response to current nutrient availability or to the nutrient availability integrated over a longer term is not well known. We tested for such effects by supplementary feeding the jackdaw (Corvus monedula) nestlings in experimentally reduced or enlarged broods with either water (control) or a food solution; these manipulations have long- and short-term effects on the nutritional state, respectively. Baseline plasma IGF-1 levels were higher in reduced broods. Food supplementation induced an increase in plasma IGF-1 levels measured one hour later, and this effect was significantly more substantial in nestlings in reduced broods. Changes in plasma IGF-1 levels increased with increased retention of the supplementary food, which was higher in reduced broods, explaining the stronger IGF-1 response. Thus, IGF-1 levels respond to short-term variations in the nutritional state, but this effect is amplified by longer-term variations in the nutritional state. We discuss our findings using a graphical model that integrates the results of the two treatments.
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Affiliation(s)
- Jaanis Lodjak
- Department of Zoology, Institute of Ecology and Earth Sciences, University of Tartu, 2 Juhan Liivi Street, 50409, Tartu, Estonia.
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Nijenborgh 7, 9747 AG, Groningen, Netherlands.
| | - Jelle Boonekamp
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Nijenborgh 7, 9747 AG, Groningen, Netherlands
- Institute of Biodiversity, Animal Health & Comparative Medicine, College of Medical, Veterinary & Life Sciences, University of Glasgow, Glasgow, UK
| | - Ádám Z Lendvai
- Department of Evolutionary Zoology and Human Biology, University of Debrecen, Debrecen, Hungary
| | - Simon Verhulst
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Nijenborgh 7, 9747 AG, Groningen, Netherlands.
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6
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Sorel MH, Murdoch AR, Zabel RW, Jorgensen JC, Kamphaus CM, Converse SJ. Juvenile life history diversity is associated with lifetime individual heterogeneity in a migratory fish. Ecosphere 2023. [DOI: 10.1002/ecs2.4366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Affiliation(s)
- Mark H. Sorel
- Washington Cooperative Fish and Wildlife Research Unit, School of Aquatic and Fishery Sciences University of Washington Seattle Washington USA
| | - Andrew R. Murdoch
- Washington Department of Fish and Wildlife North Olympia Washington USA
| | - Richard W. Zabel
- National Marine Fisheries Service Northwest Fisheries Science Center Seattle Washington USA
| | - Jeffrey C. Jorgensen
- National Marine Fisheries Service Northwest Fisheries Science Center Seattle Washington USA
| | - Corey M. Kamphaus
- Yakama Nation Fisheries, Mid‐Columbia Field Station Peshastin Washington USA
| | - Sarah J. Converse
- US Geological Survey, Washington Cooperative Fish and Wildlife Research Unit, School of Environmental and Forest Sciences & School of Aquatic and Fishery Sciences University of Washington Seattle Washington USA
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7
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Ridenour M, Spicer LJ, Grindstaff JL. Insulin-like growth factor 1 and the hormonal mediation of sibling rivalry. Gen Comp Endocrinol 2023; 330:114163. [PMID: 36356644 DOI: 10.1016/j.ygcen.2022.114163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 10/27/2022] [Accepted: 11/02/2022] [Indexed: 11/09/2022]
Abstract
In altricial animals, young are completely dependent on parents for provisioning. The ability to outcompete siblings to receive parental provisioning has clear fitness benefits, and may be mediated by hormones that influence growth. We analyzed the effects of insulin-like growth factor 1 (IGF-1) on body size, growth, and sibling rivalry in eastern bluebirds (Sialia sialis). To determine whether IGF-1 is upregulated in response to the competitive environment, we manipulated brood sizes and examined the effect on IGF-1 levels, nestling body size, growth rate, and behavior. In a separate experiment, we injected nestlings with exogenous IGF-1 to study its impacts on body size, growth rate, and sibling competition. Brood size manipulation did not influence endogenous IGF-1 levels, but male nestlings with higher IGF-1 levels early in the nestling period tended to have greater mass gain than males with lower IGF-1 levels. Nestlings with higher IGF-1 levels also tended to be fed more frequently by parents. In the injection experiment, IGF-1 injected individuals tended to be heavier than vehicle injected young by the end of the nestling period, which suggests that IGF-1 can influence mass gain in bluebirds. IGF-1 has been proposed to be a mediator of life-history strategies and post-hatching behavior. Our results suggest that although bluebird nestlings do not adaptively elevate IGF-1 in response to the presence or number of siblings, IGF-1 may influence growth during the nestling period. These findings shed light on sibling competition, life history strategies, and the hormones that underlie them.
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Affiliation(s)
- Matthew Ridenour
- Oklahoma State University, 501 Life Sciences West, Stillwater, OK 74078, USA
| | - Leon J Spicer
- Oklahoma State University, 101 Animal Science Building, Stillwater, OK 74078, USA
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8
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Tóth Z, Mahr K, Ölveczki G, Őri L, Lendvai ÁZ. Food Restriction Reveals Individual Differences in Insulin-Like Growth Factor-1 Reaction Norms. Front Ecol Evol 2022. [DOI: 10.3389/fevo.2022.826968] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Most organisms have to cope with unpredictable environmental challenges such as fluctuations in nutritional resources. Insulin-like growth factor-1 (IGF-1) is an evolutionarily conserved hormone that is highly sensitive to the individual nutritional status and regulates major life-history traits including lifespan and reproduction across vertebrates. We investigated the role of IGF-1 during periods of food shortages by altering between two feeding regimes (110 and 70% of daily food intake) after a period of ad libitum feeding in captive bearded reedlings (Panurus biarmicus). Each dietary treatment was repeated twice. Birds lost mass under food restriction, but the magnitude of mass change depended on the preceding dietary conditions. Moreover, bearded reedlings showed large, repeatable individual differences in their IGF-1 reaction norms with some individuals increasing IGF-1 levels in response to a restricted diet, whereas others showed no responses or decreased IGF-1 levels. This variation was explained by differences in average body mass: heavier individuals had higher IGF-1 levels during the control treatment and were more likely to decrease IGF-1 levels in response to the dietary restriction than did lighter ones. This result uncovers an individual by environment interaction (I × E) and may have important implications for the evolution of IGF-1 related hormonal phenotypes in this species.
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9
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Laubach ZM, Holekamp KE, Aris IM, Slopen N, Perng W. Applications of conceptual models from lifecourse epidemiology in ecology and evolutionary biology. Biol Lett 2022; 18:20220194. [PMID: 35855609 PMCID: PMC9297019 DOI: 10.1098/rsbl.2022.0194] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Accepted: 06/10/2022] [Indexed: 11/30/2022] Open
Abstract
In ecology and evolutionary biology (EEB), the study of developmental plasticity seeks to understand ontogenetic processes underlying the phenotypes upon which natural selection acts. A central challenge to this inquiry is ascertaining a causal effect of the exposure on the manifestation of later-life phenotype due to the time elapsed between the two events. The exposure is a potential cause of the outcome-i.e. an environmental stimulus or experience. The later phenotype might be a behaviour, physiological condition, morphology or life-history trait. The latency period between the exposure and outcome complicates causal inference due to the inevitable occurrence of additional events that may affect the relationship of interest. Here, we describe six distinct but non-mutually exclusive conceptual models from the field of lifecourse epidemiology and discuss their applications to EEB research. The models include Critical Period with No Later Modifiers, Critical Period with Later Modifiers, Accumulation of Risk with Independent Risk Exposures, Accumulation of Risk with Risk Clustering, Accumulation of Risk with Chains of Risk and Accumulation of Risk with Trigger Effect. These models, which have been widely used to test causal hypotheses regarding the early origins of adult-onset disease in humans, are directly relevant to research on developmental plasticity in EEB.
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Affiliation(s)
- Zachary M. Laubach
- Department of Ecology and Evolutionary Biology (EEB), University of Colorado Boulder, Boulder, CO, USA
- Mara Hyena Project, Karen, Nairobi, Kenya
| | - Kay E. Holekamp
- Mara Hyena Project, Karen, Nairobi, Kenya
- Department of Integrative Biology, Michigan State University, East Lansing, MI, USA
| | - Izzuddin M. Aris
- Division of Chronic Disease Research Across the Lifecourse, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA
| | - Natalie Slopen
- Department of Social and Behavioral Sciences, Harvard T.H. Chan School of Public Health, Boston, MA, USA
| | - Wei Perng
- Department of Epidemiology, Colorado School of Public Health, University of Colorado, Aurora, CO, USA
- Lifecourse Epidemiology of Adiposity and Diabetes (LEAD) Center, University of Colorado, Aurora, CO, USA
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10
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Montoya B, Tóth Z, Lendvai ÁZ, Stier A, Criscuolo F, Zahn S, Bize P. Does IGF-1 Shape Life-History Trade-Offs? Opposite Associations of IGF-1 With Telomere Length and Body Size in a Free-Living Bird. Front Ecol Evol 2022. [DOI: 10.3389/fevo.2022.853674] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Hormonal pathways have been proposed to be key at modulating how fast individuals grow and reproduce and how long they live (i.e., life history trajectory). Research in model species living under controlled environment is suggesting that insulin-like growth factor 1 (IGF-1), which is an evolutionarily conserved polypeptide hormone, has an important role in modulating animal life histories. Much remains, however, to be done to test the role played by IGF-1 in shaping the phenotype and life history of animals in the wild. Using a wild long-lived bird, the Alpine swift (Tachymarptis melba), we show that adults with higher levels of IGF-1 had longer wings and shorter telomeres. Hence, telomeres being a proxy of lifespan in this species, our results support a potential role of IGF-1 at shaping the life-history of wild birds and suggest that IGF-1 may influence the growth-lifespan trade-off.
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11
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Warne RW, Dallas J. Microbiome mediation of animal life histories
via
metabolites and insulin‐like signalling. Biol Rev Camb Philos Soc 2022; 97:1118-1130. [DOI: 10.1111/brv.12833] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 01/05/2022] [Accepted: 01/06/2022] [Indexed: 12/15/2022]
Affiliation(s)
- Robin W. Warne
- School of Biological Sciences Southern Illinois University 1125 Lincoln Dr. Carbondale IL 62901‐6501 U.S.A
| | - Jason Dallas
- School of Biological Sciences Southern Illinois University 1125 Lincoln Dr. Carbondale IL 62901‐6501 U.S.A
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12
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Bartke A, Sun LY, Li X, Miller RA. Early Life Interventions Can Shape Aging. Front Endocrinol (Lausanne) 2022; 13:797581. [PMID: 35282433 PMCID: PMC8916564 DOI: 10.3389/fendo.2022.797581] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 02/04/2022] [Indexed: 01/24/2023] Open
Abstract
It is well documented that the environment of the developing fetus, including availability of nutrients and presence of toxins, can have major impact on adult phenotype, age-related traits and risk of chronic disease. There is also accumulating evidence that postnatal environment can impact adult characteristics related to evolutionary fitness, health, and aging. To determine whether early life hormonal interventions can alter trajectory of aging, we have examined the effects of early life growth hormone (GH) replacement therapy in Prop1df (Ames dwarf) mice which are GH deficient and remarkably long lived. Twice-daily GH injections between the ages of two and eight weeks completely normalized ("rescued") a number of adult metabolic characteristics believed to contribute to extended longevity of these mutants. Importantly, longevity of Ames dwarf mice was reduced by early life GH treatment. This was associated with histone H3 modifications. We conclude that the trajectory of mammalian aging can be modified by early life interventions. Mechanistic links among interventions during postnatal development, adult metabolic characteristics, aging, and longevity, apparently involve epigenetic phenomena.
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Affiliation(s)
- Andrzej Bartke
- Department of Internal Medicine, Southern Illinois University School of Medicine, Springfield, IL, United States
- *Correspondence: Andrzej Bartke,
| | - Liou Y. Sun
- Department of Biology, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Xinna Li
- Department of Pathology and Paul Glenn Center for Biology of Aging Research, University of Michigan, Ann Arbor, MI, United States
| | - Richard A. Miller
- Department of Pathology and Paul Glenn Center for Biology of Aging Research, University of Michigan, Ann Arbor, MI, United States
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13
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Lendvai ÁZ, Tóth Z, Mahr K, Osváth G, Vogel-Kindgen S, Gander BA. Effects of experimental increase in insulin-like growth factor 1 on feather growth rate, moult intensity and feather quality in a passerine bird. J Exp Biol 2021; 224:269142. [PMID: 34124749 DOI: 10.1242/jeb.242481] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Accepted: 06/10/2021] [Indexed: 12/27/2022]
Abstract
Moulting is a crucial, yet often overlooked life-history stage in many animals, when they renew their integumental structures. This life-history stage is an energetically demanding somatic growth event that has particular importance in birds because feathers play a crucial role in flight, insulation and communication. Somatic growth processes are regulated by the evolutionarily conserved peptide hormone insulin-like growth factor 1 (IGF-1). However, the role of IGF-1 in feather growth remains unknown. In this study, we captured 41 juvenile free-living bearded reedlings (Panurus biarmicus) that had started their first complete moult and brought them into captivity. Then, we manipulated their circulating IGF-1 levels using poly-(lactic-co-glycolid acid) microparticles (microspheres) that provide a sustained release of IGF-1. The treatment increased IGF-1 levels but did not affect the feather growth rate. However, 2 weeks after the treatment, birds in the increased IGF-1 group were moulting more feathers simultaneously than the controls and were at a more advanced stage of moult. Birds with experimentally increased IGF-1 levels had better quality feathers (measured by a lower number of fault bars) than the controls. These results suggest that an increase in IGF-1 does not speed up feather growth, but may alter moult intensity by initiating the renewal of several feathers simultaneously. This may shorten the overall moulting time but may imply costs in terms of IGF-1-induced oxidative stress.
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Affiliation(s)
- Ádám Z Lendvai
- Department of Evolutionary Zoology and Human Biology, University of Debrecen, 4032 Debrecen, Hungary
| | - Zsófia Tóth
- Department of Evolutionary Zoology and Human Biology, University of Debrecen, 4032 Debrecen, Hungary.,Juhász-Nagy Pál Doctoral School of Biology and Environmental Sciences , University of Debrecen, 4032 Debrecen, Hungary
| | - Katharina Mahr
- Department of Evolutionary Zoology and Human Biology, University of Debrecen, 4032 Debrecen, Hungary.,Konrad Lorenz Institute of Ethology, Department of Interdisciplinary Life Sciences, University of Veterinary Medicine, 1160 Vienna, Austria
| | - Gergely Osváth
- Department of Evolutionary Zoology and Human Biology, University of Debrecen, 4032 Debrecen, Hungary.,Juhász-Nagy Pál Doctoral School of Biology and Environmental Sciences , University of Debrecen, 4032 Debrecen, Hungary.,Evolutionary Ecology Group, Hungarian Department of Biology and Ecology, Babeş-Bolyai University, 400006 Cluj-Napoca, Romania.,Museum of Zoology, Babeş-Bolyai University, 400006 Cluj-Napoca, Romania
| | | | - Bruno A Gander
- Institute of Pharmaceutical Sciences, ETH Zurich, 8057 Zurich, Switzerland
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14
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Lodjak J, Verhulst S. Insulin-like growth factor 1 of wild vertebrates in a life-history context. Mol Cell Endocrinol 2020; 518:110978. [PMID: 32798584 DOI: 10.1016/j.mce.2020.110978] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 08/03/2020] [Accepted: 08/03/2020] [Indexed: 12/15/2022]
Abstract
Broad variation in intra- and interspecific life-history traits is largely shaped by resource limitation and the ensuing allocation trade-offs that animals are forced to make. Insulin-like growth factor 1 (IGF-1), a growth-hormone-dependent peptide, may be a key player in the regulation of allocation processes. In laboratory animals, the effects of IGF-1 on growth- and development (positive), reproduction (positive), and longevity (negative) are well established. We here review the evidence on these effects in wild vertebrates, where animals are more likely to face resource limitation and other challenges. We point out the similarities and dissimilarities in patterns of IGF-1 functions obtained in these two different study settings and discuss the knowledge we need to develop a comprehensive picture of the role of IGF-1 in mediating life-history variation of wild vertebrates.
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Affiliation(s)
- Jaanis Lodjak
- Department of Zoology, Institute of Ecology and Earth Sciences, University of Tartu, 46 Vanemuise Street, Tartu, 51014, Estonia; Groningen Institute for Evolutionary Life Sciences, University of Groningen, Nijenborgh 7, 9747 AG, Groningen, Netherlands.
| | - Simon Verhulst
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Nijenborgh 7, 9747 AG, Groningen, Netherlands
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15
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How climate change affects parasites: the case of trematode parasite Clinostomum complanatum and its fish host Trichogaster fasiatus. J Parasit Dis 2020; 44:476-480. [PMID: 32508427 DOI: 10.1007/s12639-020-01214-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 03/10/2020] [Indexed: 10/24/2022] Open
Abstract
This study was undertaken to understand the impact of climate change on the ecology of infection of Clinostomum complanatum, a model trematode parasite. We analysed climate change data and data from infected fish over a period of seven years (2007-2013) from the Aligarh region (India) in this retrospective study. We show that infection of the trematode parasite Clinostomum complanatum (Rudolphi, 1814) in the forage fish Trichogaster facsiatus (Bloch & Schneider, 1801) is dependent on surface air temperature amongst the (ecologically) relevant climate change variables for both the parasite and its host. This study is the first to implicate surface air temperature as an environmental variable that may contribute towards parasitism, particularly for parasites with a piscine host. The biological relevance of changing climate on the ecology of this parasite is discussed.
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Insulin-like growth factor 1 is related to the expression of plumage traits in a passerine species. Behav Ecol Sociobiol 2020. [DOI: 10.1007/s00265-020-2821-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Abstract
Avian plumage colors and ornaments are excellent models to study the endocrine mechanisms linking sexually selected traits and individual parameters of quality and condition. Insulin-like growth factor 1 (IGF-1) is an evolutionarily highly conserved peptide hormone. Its regulatory role in cell proliferation and differentiation and its high sensitivity to the nutritional state of individuals suggest it as an interesting candidate, possibly providing a link between body condition and individual capacity to grow elaborated ornamental features. We investigated whether IGF-1 levels during molting correlate with the expression of multiple ornaments in a sexually dichromatic passerine species, the bearded reedling (Panurus biarmicus). We collected blood samples of males and females shortly before the molting completed and measured the size and colors of ornamental traits. Our results indicate that in males, structural plumage colors, the size of the melanin-based ornament (beard), and tail length are independent traits. IGF-1 levels are associated with the length of the tail and the expression of male structural plumage components (UV coloration), but not the melanin-based ornament. In females, plumage color and tail length were independent traits, which were not related to IGF-1 levels. To the best of our knowledge, this study provides the first evidence that IGF-1 could play a role in the development of secondary sexual characters in a bird species.
Significance statement
IGF-1 is an evolutionarily highly conserved peptide hormone, which recently entered the center stage of research enquiry in evolutionary biology. It is considered as one of the key factors shaping individual life histories, but little is known about its effects on sexually selected traits. We investigated whether IGF-1 levels during molting predict the elaboration of multiple ornamental plumage traits in male and female bearded reedlings (Panurus biarmicus). Our results indicate that higher IGF-1 levels had positive effects on male structural plumage colors and tail feather length. This is the first study, bringing indication for a potential role of IGF-1 in the expression of plumage ornaments in a bird species. Our findings suggest that IGF-1 might serve as an ideal candidate to study the mechanisms linking condition and the capacity to develop sexually selected ornaments.
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Emborski C, Mikheyev AS. Ancestral diet transgenerationally influences offspring in a parent-of-origin and sex-specific manner. Philos Trans R Soc Lond B Biol Sci 2020; 374:20180181. [PMID: 30966955 PMCID: PMC6365861 DOI: 10.1098/rstb.2018.0181] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Parent-of-origin effects, whereby specific phenotypes are differentially inherited paternally or maternally, provide useful clues to better understand transgenerational effect transmission. Ancestral diet influences offspring phenotypes, including body composition and fitness. However, the specific role that mothers and fathers play in the transmission of altered phenotypes to male and female offspring remains unclear. We investigated the influence of the parent-of-origin's diet on adult progeny phenotypes and reproductive output for three generations in fruit flies (Drosophila melanogaster). Males and females reared on a control diet were exposed to the control diet or one of two altered (no- or high-) sugar treatment diets for a single generation. Flies from one of the two altered diet treatments were then mated to control flies in a full-factorial design to produce F1 offspring and kept on control media for each following generation. We found parent-of-origin (triglyceride) and non-parent-of-origin (sugar) body composition effects, which were transgenerational and sex-specific. Additionally, we observed a negative correlation between intergenerational maternal reproductive output and triglyceride levels, suggesting that ancestral diet may affect fitness. This work demonstrates that ancestral diet can transmit altered phenotypes in a parent-of-origin and sex-specific manner and highlights that mechanisms regulating such transmission have been greatly overlooked. This article is part of the theme issue ‘The role of plasticity in phenotypic adaptation to rapid environmental change’.
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Affiliation(s)
- Carmen Emborski
- 1 The Institute of Environmental and Human Health, Texas Tech University , Lubbock, TX 79416 , USA.,2 Okinawa Institute of Science and Technology , 1919-1 Tancha, Onna, Kunigami District, Okinawa Prefecture 904-0495 , Japan
| | - Alexander S Mikheyev
- 2 Okinawa Institute of Science and Technology , 1919-1 Tancha, Onna, Kunigami District, Okinawa Prefecture 904-0495 , Japan.,3 Research School of Biology, Australia National University , 134 Linnaeus Way, Acton, Australian Capital Territory 2601 , Australia
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Johnson-Ulrich L, Benson-Amram S, Holekamp KE. Fitness Consequences of Innovation in Spotted Hyenas. Front Ecol Evol 2019. [DOI: 10.3389/fevo.2019.00443] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
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Regan JC, Froy H, Walling CA, Moatt JP, Nussey DH. Dietary restriction and insulin‐like signalling pathways as adaptive plasticity: A synthesis and re‐evaluation. Funct Ecol 2019. [DOI: 10.1111/1365-2435.13418] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Jennifer C. Regan
- Institute of Immunology and Infection Research, School of Biological Sciences University of Edinburgh Edinburgh UK
| | - Hannah Froy
- Centre for Biodiversity Dynamics Norwegian University of Science and Technology Trondheim Norway
| | - Craig A. Walling
- Institute for Evolutionary Biology, School of Biological Sciences University of Edinburgh Edinburgh UK
| | - Joshua P. Moatt
- Institute for Evolutionary Biology, School of Biological Sciences University of Edinburgh Edinburgh UK
| | - Daniel H. Nussey
- Institute of Immunology and Infection Research, School of Biological Sciences University of Edinburgh Edinburgh UK
- Institute for Evolutionary Biology, School of Biological Sciences University of Edinburgh Edinburgh UK
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Kramer P, Bressan P. Mitochondria Inspire a Lifestyle. ADVANCES IN ANATOMY, EMBRYOLOGY, AND CELL BIOLOGY 2019; 231:105-126. [PMID: 30610376 DOI: 10.1007/102_2018_5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Tucked inside our cells, we animals (and plants, and fungi) carry mitochondria, minuscule descendants of bacteria that invaded our common ancestor 2 billion years ago. This unplanned breakthrough endowed our ancestors with a convenient, portable source of energy, enabling them to progress towards more ambitious forms of life. Mitochondria still manufacture most of our energy; we have evolved to invest it to grow and produce offspring, and to last long enough to make it all happen. Yet because the continuous generation of energy is inevitably linked to that of toxic free radicals, mitochondria give us life and give us death. Stripping away clutter and minutiae, here we present a big-picture perspective of how mitochondria work, how they are passed on virtually only by mothers, and how they shape the lifestyles of species and individuals. We discuss why restricting food prolongs lifespan, why reproducing shortens it, and why moving about protects us from free radicals despite increasing their production. We show that our immune cells use special mitochondria to keep control over our gut microbes. And we lay out how the fabrication of energy and free radicals sets the internal clocks that command our everyday rhythms-waking, eating, sleeping. Mitochondria run the show.
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Affiliation(s)
- Peter Kramer
- Dipartimento di Psicologia Generale, University of Padova, Padova, Italy
| | - Paola Bressan
- Dipartimento di Psicologia Generale, University of Padova, Padova, Italy.
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Tóth Z, Ouyang JQ, Lendvai ÁZ. Exploring the mechanistic link between corticosterone and insulin-like growth factor-1 in a wild passerine bird. PeerJ 2018; 6:e5936. [PMID: 30581657 PMCID: PMC6296332 DOI: 10.7717/peerj.5936] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 10/15/2018] [Indexed: 01/10/2023] Open
Abstract
Background Physiological regulators of life history trade-offs need to be responsive to sudden changes of resource availability. When homeostasis is challenged by unpredictable stressors, vertebrates respond through a set of physiological reactions, which can promote organismal survival. Glucocorticoids have been traditionally recognized as one of the main regulators of the physiological stress response, but the role of an evolutionarily more conserved pathway, the hypothalamic-pituitary-somatotropic (HPS) axis producing insulin-like growth factor-1 (IGF-1) has received much less attention. Although IGF-1 is known to affect several life history traits, little is known about its role in the physiological stress response and it has never been studied directly in adult wild animals. Methods In this study, we combined field observations with a controlled experiment to investigate how circulating levels of IGF-1 change in response to stress and whether this change is due to concomitant change in glucocorticoids in a free-living songbird, the bearded reedling Panurus biarmicus. We used a standard capture-restraint protocol in field observation, in which we took first and second (stress induced: 15 minutes later) samples. In a follow-up experiment, we used a minimally invasive oral corticosterone manipulation. Results We showed that corticosterone levels significantly increased while IGF-1 levels significantly decreased during capture and handling stress. However, change in corticosterone levels were not related to change in IGF-1 levels. We found that experimentally elevated corticosterone levels did not affect IGF-1 levels. Discussion Our results are the first to highlight that circulating IGF-1 levels are responsive to stress independently from glucocorticoids and suggest that the HPS axis is an autonomous physiological pathway that may play an important role as regulator of life-history decisions.
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Affiliation(s)
- Zsófia Tóth
- Department of Evolutionary Zoology and Human Biology, University of Debrecen, Debrecen, Hungary
| | - Jenny Q Ouyang
- Department of Biology, University of Nevada, Reno, NV, United States of America
| | - Ádám Z Lendvai
- Department of Evolutionary Zoology and Human Biology, University of Debrecen, Debrecen, Hungary.,Department of Geology, University of Babeş-Bolyai, Cluj-Napoca, Romania
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Wiley AS. The Evolution of Lactase Persistence: Milk Consumption, Insulin-Like Growth Factor I, and Human Life-History Parameters. QUARTERLY REVIEW OF BIOLOGY 2018. [DOI: 10.1086/700768] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Addis EA, Gangloff EJ, Palacios MG, Carr KE, Bronikowski AM. Merging the “Morphology–Performance–Fitness” Paradigm and Life-History Theory in the Eagle Lake Garter Snake Research Project. Integr Comp Biol 2017; 57:423-435. [DOI: 10.1093/icb/icx079] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
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