phodopus

Summary

Summary: A genus of hamsters characterized by small size, very short tail, and short, broad feet with hairy soles.

Top Publications

  1. Kauffman A, Freeman D, Zucker I. Termination of neuroendocrine refractoriness to melatonin in Siberian hamsters (Phodopus sungorus). J Neuroendocrinol. 2003;15:191-6 pubmed
    ..The breaking of refractoriness, once triggered by long-day melatonin signals, proceeds to completion only in the absence of short-day melatonin signals. ..
  2. Freeman D, Zucker I. Refractoriness to melatonin occurs independently at multiple brain sites in Siberian hamsters. Proc Natl Acad Sci U S A. 2001;98:6447-52 pubmed
    ..Restricted, target-specific actions of Mel are consistent with the independent regulation by day length of the several behavioral and physiological traits that vary seasonally in mammals. ..
  3. Tups A, Helwig M, Khorooshi R, Archer Z, Klingenspor M, Mercer J. Circulating ghrelin levels and central ghrelin receptor expression are elevated in response to food deprivation in a seasonal mammal (Phodopus sungorus). J Neuroendocrinol. 2004;16:922-8 pubmed
    ..deprivation (48 h) in the hypothalamic arcuate nucleus and ventromedial nucleus of the seasonal Siberian hamster, Phodopus sungorus. This increase is accompanied by a two-fold elevation of circulating ghrelin concentration...
  4. Barrett P, Ivanova E, Graham E, Ross A, Wilson D, Plé H, et al. Photoperiodic regulation of cellular retinol binding protein, CRBP1 [corrected] and nestin in tanycytes of the third ventricle ependymal layer of the Siberian hamster. J Endocrinol. 2006;191:687-98 pubmed
    ..This provides evidence that tanycytes are seasonally responsive cells and are likely to be an important part of the mechanism to facilitate seasonal physiology and behaviour in the Siberian hamster. ..
  5. Prendergast B, Pyter L. Photoperiod history differentially impacts reproduction and immune function in adult Siberian hamsters. J Biol Rhythms. 2009;24:509-22 pubmed publisher
    ..reactions [DTH]), reproductive, and adrenocortical responses were assessed in adult Siberian hamsters (Phodopus sungorus) that had been raised initially in categorically long (15-h light/day; 15L) or short (9L) photoperiods ..
  6. Jethwa P, Warner A, Nilaweera K, Brameld J, Keyte J, Carter W, et al. VGF-derived peptide, TLQP-21, regulates food intake and body weight in Siberian hamsters. Endocrinology. 2007;148:4044-55 pubmed
    ..The effects of TLQP-21 administration are similar to those in hamsters in short days, suggesting that increased VGF activity may contribute to the hypophagia that underlies the seasonal catabolic state. ..
  7. Kauffman A, Cabrera A, Zucker I. Energy intake and fur in summer- and winter-acclimated Siberian hamsters (Phodopus sungorus). Am J Physiol Regul Integr Comp Physiol. 2001;281:R519-27 pubmed
    ..The daily food intake of Siberian hamsters (Phodopus sungorus) was measured under simulated summer and winter conditions in intact animals and those with varying ..
  8. Prendergast B, Gorman M, Zucker I. Establishment and persistence of photoperiodic memory in hamsters. Proc Natl Acad Sci U S A. 2000;97:5586-91 pubmed
    ..These findings indicate that hamsters are influenced only by relatively recent day lengths and melatonin signals and ignore earlier ones that might cause them to misinterpret the salience of current day lengths. ..
  9. Hazlerigg D, Ebling F, Johnston J. Photoperiod differentially regulates gene expression rhythms in the rostral and caudal SCN. Curr Biol. 2005;15:R449-50 pubmed

More Information

Publications73

  1. Nilaweera K, Archer Z, Campbell G, Mayer C, Balik A, Ross A, et al. Photoperiod regulates genes encoding melanocortin 3 and serotonin receptors and secretogranins in the dorsomedial posterior arcuate of the Siberian hamster. J Neuroendocrinol. 2009;21:123-31 pubmed publisher
    ..These gene expression changes in dmpARC neurones may reflect the functional requirement of these neurones for seasonal physiological responses of the hamster. ..
  2. Horton T, Yellon S. Aging, reproduction, and the melatonin rhythm in the Siberian hamster. J Biol Rhythms. 2001;16:243-53 pubmed
    ..In the wild, failure to undergo testicular regression in the presence of shortening day lengths may extend the breeding season of aged males. ..
  3. McGranaghan P, Piggins H. Orexin A-like immunoreactivity in the hypothalamus and thalamus of the Syrian hamster (Mesocricetus auratus) and Siberian hamster (Phodopus sungorus), with special reference to circadian structures. Brain Res. 2001;904:234-44 pubmed
    ..The presence of orexin A-immunoreactive fibres in the neural architecture of the mammalian circadian system suggests an important role for orexin A in circadian timekeeping processes...
  4. Herwig A, Wilson D, Logie T, Boelen A, Morgan P, Mercer J, et al. Photoperiod and acute energy deficits interact on components of the thyroid hormone system in hypothalamic tanycytes of the Siberian hamster. Am J Physiol Regul Integr Comp Physiol. 2009;296:R1307-15 pubmed publisher
    ..These data point to a mechanism whereby energy deprivation can interact with an SD photoperiod on hypothalamic tanycytes to regulate components of the thyroid hormone system involved in photoperiodic regulation of seasonal physiology...
  5. Greives T, Humber S, Goldstein A, Scotti M, Demas G, Kriegsfeld L. Photoperiod and testosterone interact to drive seasonal changes in kisspeptin expression in Siberian hamsters (Phodopus sungorus). J Neuroendocrinol. 2008;20:1339-47 pubmed publisher
    ..Collectively, these data suggest a role for both gonadal-dependent and independent (i.e. photoperiodic) mechanisms regulating seasonal changes in kisspeptin expression in Siberian hamsters...
  6. Watanabe T, Yamamura T, Watanabe M, Yasuo S, Nakao N, Dawson A, et al. Hypothalamic expression of thyroid hormone-activating and -inactivating enzyme genes in relation to photorefractoriness in birds and mammals. Am J Physiol Regul Integr Comp Physiol. 2007;292:R568-72 pubmed
    ..These gene changes may be involved in the regulation of photorefractoriness, as well as photoinduction...
  7. Prendergast B, Pyter L, Kampf Lassin A, Patel P, Stevenson T. Rapid induction of hypothalamic iodothyronine deiodinase expression by photoperiod and melatonin in juvenile Siberian hamsters (Phodopus sungorus). Endocrinology. 2013;154:831-41 pubmed publisher
    ..SD photoperiods and MEL exert rapid, sustained, and additive effects on hypothalamic dio3 mRNA, which may play a central role in inhibiting maturation of the peripubertal hypothalamo-pituitary-gonadal axis...
  8. Helwig M, Khorooshi R, Tups A, Barrett P, Archer Z, Exner C, et al. PC1/3 and PC2 gene expression and post-translational endoproteolytic pro-opiomelanocortin processing is regulated by photoperiod in the seasonal Siberian hamster (Phodopus sungorus). J Neuroendocrinol. 2006;18:413-25 pubmed
    A remarkable feature of the seasonal adaptation displayed by the Siberian hamster (Phodopus sungorus) is the ability to decrease food intake and body weight (by up to 40%) in response to shortening photoperiod...
  9. Pyter L, Nelson R. Enduring effects of photoperiod on affective behaviors in Siberian hamsters (Phodopus sungorus). Behav Neurosci. 2006;120:125-34 pubmed
    ..and postweaning photoperiods on subsequent affective behaviors were examined in adult Siberian hamsters (Phodopus sungorus)...
  10. Atgie C, Sauvant P, Ambid L, Carpene C. Possible mechanisms of weight loss of Siberian hamsters (Phodopus sungorus sungorus) exposed to short photoperiod. J Physiol Biochem. 2009;65:377-86 pubmed publisher
    ..day photoperiod (SD) exposure promote a dramatic decrease of white adipose tissue (WAT) mass in Siberian hamsters(Phodopus sungorus sungorus)...
  11. Klose M, Grote K, Lerchl A. Temporal control of spermatogenesis is independent of the central circadian pacemaker in Djungarian hamsters (Phodopus sungorus). Biol Reprod. 2011;84:124-9 pubmed publisher
    ..of the clock genes Arntl (previously called Bmal1) and Per1 in testes and kidneys of Djungarian hamsters (Phodopus sungorus)...
  12. Gorman M, Freeman D, Zucker I. Photoperiodism in hamsters: abrupt versus gradual changes in day length differentially entrain morning and evening circadian oscillators. J Biol Rhythms. 1997;12:122-35 pubmed
    ..Gradual and abrupt decreases in DL differentially affect entrainment of evening and morning circadian oscillators. The authors argue for the incorporation of simulated natural photoperiods in studies of photoperiodism...
  13. Deboer T, Tobler I. Shortening of the photoperiod affects sleep distribution, EEG and cortical temperature in the Djungarian hamster. J Comp Physiol A. 1996;179:483-92 pubmed
    ..were continuously recorded for two baseline days and after 4 h sleep deprivation in Djungarian hamsters (Phodopus sungorus) adapted to a short photoperiod (light dark 8:16)...
  14. Prendergast B, Wynne Edwards K, Yellon S, Nelson R. Photorefractoriness of immune function in male Siberian hamsters (Phodopus sungorus). J Neuroendocrinol. 2002;14:318-29 pubmed
    ..Together, these data indicate that, similar to the reproductive system, the immune system of male Siberian hamsters exhibits refractoriness to short days...
  15. Paçó A, Chaves R, Vieira da Silva A, Adega F. The involvement of repetitive sequences in the remodelling of karyotypes: the Phodopus genomes (Rodentia, Cricetidae). Micron. 2013;46:27-34 pubmed publisher
    In this work we characterize the Phodopus roborovskii and Phodopus sungorus karyotypes, describing the constitutive heterochromatin and the telomeric repeats distribution in these chromosomes...
  16. Scotti M, Place N, Demas G. Short-day increases in aggression are independent of circulating gonadal steroids in female Siberian hamsters (Phodopus sungorus). Horm Behav. 2007;52:183-90 pubmed
    ..Virtually nothing is known, however, regarding seasonal aggression in female Siberian hamsters (Phodopus sungorus)...
  17. Bailey M, Walton J, Dowd S, Weil Z, Nelson R. Photoperiod modulates gut bacteria composition in male Siberian hamsters (Phodopus sungorus). Brain Behav Immun. 2010;24:577-84 pubmed publisher
    ..Male Siberian hamsters (Phodopus sungorus) housed in long summer-like day lengths have significantly elevated body and fat masses compared to ..
  18. Pak T, Lynch G, Tsai P. Testosterone and estrogen act via different pathways to inhibit puberty in the male Siberian hamster (Phodopus sungorus). Endocrinology. 2001;142:3309-16 pubmed
    ..5 +/- 0.98 ng/ml) yet significantly lower pituitary FSH concentration (0.09 +/- 0.04 ng/microg protein). These results showed that the pathways of T and E2 action on the hypothalamo-pituitary-gonadal axis are distinct...
  19. Prendergast B, Hotchkiss A, Bilbo S, Nelson R. Peripubertal immune challenges attenuate reproductive development in male Siberian hamsters (Phodopus sungorus). Biol Reprod. 2004;70:813-20 pubmed
    ..The data also underscore the importance of seasonally dependent life history factors in assessing physiological tradeoffs...
  20. Johnston J, Ebling F, Hazlerigg D. Photoperiod regulates multiple gene expression in the suprachiasmatic nuclei and pars tuberalis of the Siberian hamster (Phodopus sungorus). Eur J Neurosci. 2005;21:2967-74 pubmed
  21. Butler M, Zucker I. Seasonal pelage changes are synchronized by simulated natural photoperiods in Siberian hamsters (Phodopus sungorus). J Exp Zool A Ecol Genet Physiol. 2009;311:475-82 pubmed publisher
    ..lengths (DLs) synchronize the seasonal molt was assessed in nine cohorts of male and female Siberian hamsters (Phodopus sungorus) born into a simulated natural photoperiod (SNP) beginning 4 weeks before and ending 12 weeks after the ..
  22. Gorman M, Elliott J. Dim nocturnal illumination alters coupling of circadian pacemakers in Siberian hamsters, Phodopus sungorus. J Comp Physiol A Neuroethol Sens Neural Behav Physiol. 2004;190:631-9 pubmed
    ..The two experiments demonstrate substantial efficacy of light intensities generally viewed as below the threshold of circadian systems. Light may act on oscillator coupling through rod-dependent mechanisms...
  23. Madarame H, Itoh A, Hirose M, Ogihara K. Spontaneous extraskeletal osteosarcomas of the subcutis in Djungarian hamsters (Phodopus sungorus): report of two cases. J Vet Med A Physiol Pathol Clin Med. 2004;51:232-6 pubmed
    ..No abnormality was observed in any skeletal bones and no change suggesting tumorous growth was observed in any other sites. This is the first report of extraskeletal osteosarcomas in Djungarian hamsters...
  24. Meachem S, Stanton P, Schlatt S. Follicle-stimulating hormone regulates both Sertoli cell and spermatogonial populations in the adult photoinhibited Djungarian hamster testis. Biol Reprod. 2005;72:1187-93 pubmed
    ..This naturally occurring model provides a unique opportunity to understand the mechanisms (apoptotic and/or proliferative) by which FSH regulates Sertoli and germ cell development in the adult animal...
  25. Liebig M, von Praun C, Heldmaier G, Klingenspor M. Absence of UCP3 in brown adipose tissue does not impair nonshivering thermogenesis. Physiol Biochem Zool. 2004;77:116-26 pubmed
  26. Klingenspor M, Niggemann H, Heldmaier G. Modulation of leptin sensitivity by short photoperiod acclimation in the Djungarian hamster, Phodopus sungorus. J Comp Physiol B. 2000;170:37-43 pubmed
  27. Prendergast B. MT1 melatonin receptors mediate somatic, behavioral, and reproductive neuroendocrine responses to photoperiod and melatonin in Siberian hamsters (Phodopus sungorus). Endocrinology. 2010;151:714-21 pubmed publisher
    ..receptors are necessary and sufficient to engage photoperiodic responses by challenging male Siberian hamsters (Phodopus sungorus), a species that does not express functional MT2 receptors, with ramelteon (RAM), a specific MT1/MT2 ..
  28. Moffatt Blue C, Sury J, Young K. Short photoperiod-induced ovarian regression is mediated by apoptosis in Siberian hamsters (Phodopus sungorus). Reproduction. 2006;131:771-82 pubmed
    ..These data indicate that SD exposure rapidly induces follicular apoptosis in Siberian hamsters, which ultimately disrupts both estradiol secretion and folliculogenesis, resulting in the seasonal loss of ovarian function...
  29. Wistuba J, Mundry M, Luetjens C, Schlatt S. Cografting of hamster (Phodopus sungorus) and marmoset (Callithrix jacchus) testicular tissues into nude mice does not overcome blockade of early spermatogenic differentiation in primate grafts. Biol Reprod. 2004;71:2087-91 pubmed
    ..Our results indicate that the conditions needed for initiation of spermatogenesis in the marmoset are remarkably different from those present in most other mammals...
  30. Reuss S, Schaeffer D, Laages M, Riemann R. Evidence for increased nitric oxide production in the auditory brain stem of the aged dwarf hamster (Phodopus sungorus): an NADPH-diaphorase histochemical study. Mech Ageing Dev. 2000;112:125-34 pubmed
    ..to investigate the numbers of NO-producing cells in the SOC of adult and senile Djungarian dwarf hamsters (Phodopus sungorus)...
  31. Palchykova S, Deboer T, Tobler I. Selective sleep deprivation after daily torpor in the Djungarian hamster. J Sleep Res. 2002;11:313-9 pubmed
    ..The frontal predominance of slow waves encountered both after torpor and SD indicates that waking and torpor induce similar regional changes in EEG SWA...
  32. Herwig A, Petri I, Barrett P. Hypothalamic gene expression rapidly changes in response to photoperiod in juvenile Siberian hamsters (Phodopus sungorus). J Neuroendocrinol. 2012;24:991-8 pubmed publisher
  33. Barrett P, van den Top M, Wilson D, Mercer J, Song C, Bartness T, et al. Short photoperiod-induced decrease of histamine H3 receptors facilitates activation of hypothalamic neurons in the Siberian hamster. Endocrinology. 2009;150:3655-63 pubmed publisher
    ..These data strongly suggest that increased activity of dmpARC neurons, as a consequence of down-regulation of the histamine H3 receptor, contributes to the physiological adaptation of body weight regulation in seasonal photoperiod...
  34. Nuesslein Hildesheim B, O Brien J, Ebling F, Maywood E, Hastings M. The circadian cycle of mPER clock gene products in the suprachiasmatic nucleus of the siberian hamster encodes both daily and seasonal time. Eur J Neurosci. 2000;12:2856-64 pubmed
    ..identified clock gene products (mPER and mTIM) in the SCN of a highly seasonal mammal, the Siberian hamster (Phodopus sungorus)...
  35. Demas G, Bowers R, Bartness T, Gettys T. Photoperiodic regulation of gene expression in brown and white adipose tissue of Siberian hamsters (Phodopus sungorus). Am J Physiol Regul Integr Comp Physiol. 2002;282:R114-21 pubmed
    ..Thus the SD-induced decreased adiposity of Siberian hamsters may be due to a coordinated suite of WAT and BAT gene transcription changes ultimately increasing lipid mobilization and utilization...
  36. Salverson T, McMichael G, Sury J, Shahed A, Young K. Differential expression of matrix metalloproteinases during stimulated ovarian recrudescence in Siberian hamsters (Phodopus sungorus). Gen Comp Endocrinol. 2008;155:749-61 pubmed
    ..Because of the variation observed in expression patterns, MMPs and TIMPs may be differentially involved with photostimulated return to ovarian function...
  37. Gunduz B, Stetson M. A test of the coincidence and duration models of melatonin action in Siberian hamsters: the effects of 1-hr melatonin infusions on testicular development in intact and pinealectomized prepubertal Phodopus sungorus. J Pineal Res. 2001;30:97-107 pubmed
    ..daily infusions of 10, 25, and 50 ng of melatonin in pinealectomized intact and prepubertal Siberian hamsters (Phodopus sungorus)...
  38. Ruby N, Saran A, Kang T, Franken P, Heller H. Siberian hamsters free run or become arrhythmic after a phase delay of the photocycle. Am J Physiol. 1996;271:R881-90 pubmed
    Body temperature (Tb) and locomotor activity were recorded telemetrically from male Siberian hamsters (Phodopus sungorus sungorus) that were 3 or 12 mo of age and maintained in a light-dark (LD) cycle of 16 h light/day for 2-4 mo...
  39. Brooks P, Vella E, Wynne Edwards K. Dopamine agonist treatment before and after the birth reduces prolactin concentration but does not impair paternal responsiveness in Djungarian hamsters, Phodopus campbelli. Horm Behav. 2005;47:358-66 pubmed
    Male Djungarian hamsters, Phodopus campbelli, are highly parental and experience a late-afternoon prolactin surge before the birth that is not seen in a closely related species, P. sungorus, which lacks paternal care...
  40. Drazen D, Demas G, Nelson R. Leptin effects on immune function and energy balance are photoperiod dependent in Siberian hamsters (Phodopus sungorus). Endocrinology. 2001;142:2768-75 pubmed
    ..interaction further, exogenous leptin was administered for 2 weeks via osmotic minipumps to Siberian hamsters (Phodopus sungorus) housed in long or short days for a total of 12 weeks...
  41. Gorman M, Elliott J. Entrainment of 2 subjective nights by daily light:dark:light:dark cycles in 3 rodent species. J Biol Rhythms. 2003;18:502-12 pubmed
  42. Demas G. Splenic denervation blocks leptin-induced enhancement of humoral immunity in Siberian hamsters (Phodopus sungorus). Neuroendocrinology. 2002;76:178-84 pubmed
  43. Grone B, Chang D, Bourgin P, Cao V, Fernald R, Heller H, et al. Acute light exposure suppresses circadian rhythms in clock gene expression. J Biol Rhythms. 2011;26:78-81 pubmed publisher
    ..photic stimuli given on 2 successive nights was used to induce circadian arrhythmia in the Siberian hamster ( Phodopus sungorus)...
  44. Demas G, Drazen D, Jasnow A, Bartness T, Nelson R. Sympathoadrenal system differentially affects photoperiodic changes in humoral immunity of Siberian hamsters (Phodopus sungorus). J Neuroendocrinol. 2002;14:29-35 pubmed
    Siberian hamsters (Phodopus sungorus) rely on photoperiod as a primary cue to coordinate seasonally appropriate changes in physiology and behaviour...
  45. Duffield G, McNulty S, Ebling F. Anatomical and functional characterisation of a dopaminergic system in the suprachiasmatic nucleus of the neonatal Siberian hamster. J Comp Neurol. 1999;408:73-96 pubmed
  46. Greives T, Kriegsfeld L, Demas G. Exogenous kisspeptin does not alter photoperiod-induced gonadal regression in Siberian hamsters (Phodopus sungorus). Gen Comp Endocrinol. 2008;156:552-8 pubmed publisher
    ..results from reduced kisspeptin stimulation of the reproductive axis in seasonally breeding Siberian hamsters (Phodopus sungorus)...
  47. Herwig A, Ivanova E, Lydon H, Barrett P, Steinlechner S, Loudon A. Histamine H3 receptor and orexin A expression during daily torpor in the Djungarian hamster (Phodopus sungorus). J Neuroendocrinol. 2007;19:1001-7 pubmed
    ..reduced metabolism, hypothermia and suppressed central nervous system activity, whereas the Djungarian hamster (Phodopus sungorus) employs daily bouts of torpor associated with reduced body temperature and energy expenditure...
  48. Fromme T, Reichwald K, Platzer M, Li X, Klingenspor M. Chicken ovalbumin upstream promoter transcription factor II regulates uncoupling protein 3 gene transcription in Phodopus sungorus. BMC Mol Biol. 2007;8:1 pubmed
    ..In this study we in silico analyzed the upstream region of Ucp3 of the Djungarian hamster Phodopus sungorus and identified several putative response elements for Coup-TFII...
  49. Pak T, Lynch G, Tsai P. Estrogen accelerates gonadal recrudescence in photo-regressed male siberian hamsters. Endocrinology. 2002;143:4131-4 pubmed
    ..Further, we demonstrated a novel role of E(2) in the initiation of spermatogenesis, possibly via a mechanism independent of FSH...
  50. Shahed A, Young K. Differential ovarian expression of KiSS-1 and GPR-54 during the estrous cycle and photoperiod induced recrudescence in Siberian hamsters (Phodopus sungorus). Mol Reprod Dev. 2009;76:444-52 pubmed publisher
    ..This study examined the expression of KiSS-1/GPR54 mRNA and protein in ovaries of Siberian hamsters (Phodopus sungorus)...
  51. Duffield G, Hastings M, Ebling F. Investigation into the regulation of the circadian system by dopamine and melatonin in the adult Siberian hamster (Phodopus sungorus). J Neuroendocrinol. 1998;10:871-84 pubmed
    ..studies was to investigate their role in the entrainment of the circadian system of the adult Siberian hamster (Phodopus sungorus)...
  52. Kauffman A, Zucker I. Testicular recrudescence in intermediate day lengths reflects loss of photoperiodic memory in Siberian hamsters. J Biol Rhythms. 2002;17:345-52 pubmed
  53. Gunduz B, Stetson M. A test of the coincidence and duration models of melatonin action in Siberian hamsters. II. The effects of 4- and 8-hr melatonin infusions on testicular development of pinealectomized juvenile Siberian hamsters (Phodopus sungorus). J Pineal Res. 2001;30:56-64 pubmed
    ..The duration of the melatonin signal alone can not explain the results...
  54. Prendergast B, Mosinger B, Kolattukudy P, Nelson R. Hypothalamic gene expression in reproductively photoresponsive and photorefractory Siberian hamsters. Proc Natl Acad Sci U S A. 2002;99:16291-6 pubmed
  55. von Praun C, Burkert M, Gessner M, Klingenspor M. Tissue-specific expression and cold-induced mRNA levels of uncoupling proteins in the Djungarian hamster. Physiol Biochem Zool. 2001;74:203-11 pubmed
    ..In skeletal muscle, UCP2 and UCP3 mRNA levels were not altered. Cold-induced changes of serum FFA levels correlated with the stimulation of UCP1 mRNA in BAT but not with UCP2 and UCP3...
  56. Tarulli G, Stanton P, Lerchl A, Meachem S. Adult sertoli cells are not terminally differentiated in the Djungarian hamster: effect of FSH on proliferation and junction protein organization. Biol Reprod. 2006;74:798-806 pubmed
    ..by hormones after puberty in mammals, although recent data using the seasonal breeding adult Djungarian hamster (Phodopus sungorus) model challenged this assertion by demonstrating a decrease in Sertoli cell number after gonadotropin ..
  57. Anand S, Turek F, Horton T. Chemosensory stimulation of luteinizing hormone secretion in male Siberian hamsters (Phodopus sungorus). Biol Reprod. 2004;70:1033-40 pubmed
    Male Siberian hamsters (Phodopus sungorus) housed in long days (LD), but not short days (SD) release luteinizing hormone (LH) when exposed to females...
  58. Deboer T, Franken P, Tobler I. Sleep and cortical temperature in the Djungarian hamster under baseline conditions and after sleep deprivation. J Comp Physiol A. 1994;174:145-55 pubmed
    The Djungarian hamster (Phodopus sungorus) is a markedly photoperiodic rodent which exhibits daily torpor under short photoperiod. Normative data were obtained on vigilance states, electroencephalogram (EEG) power spectra (0.25-25...
  59. Ellis C, Moar K, Logie T, Ross A, Morgan P, Mercer J. Diurnal profiles of hypothalamic energy balance gene expression with photoperiod manipulation in the Siberian hamster, Phodopus sungorus. Am J Physiol Regul Integr Comp Physiol. 2008;294:R1148-53 pubmed publisher
  60. Prendergast B, Nelson R. Affective responses to changes in day length in Siberian hamsters (Phodopus sungorus). Psychoneuroendocrinology. 2005;30:438-52 pubmed
    ..Male and female Siberian hamsters (Phodopus sungorus) were exposed to long (16 h light/day; LD) or short (8 h light/day; SD) photoperiods beginning at the ..
  61. Gorman M, Zucker I. Pattern of change in melatonin duration determines testicular responses in Siberian hamsters, Phodopus sungorus. Biol Reprod. 1997;56:668-73 pubmed
    ..The pattern of change in MEL secretion, as well as absolute duration of the MEL signal, is important for implementing seasonal cycles of reproduction...
  62. Demas G. In vivo but not in vitro leptin enhances lymphocyte proliferation in Siberian hamsters (Phodopus sungorus). Gen Comp Endocrinol. 2010;166:314-9 pubmed publisher
    ..moderate reduction in energy stores by partial surgical lipectomy impairs humoral immunity of Siberian hamsters (Phodopus sungorus) and is mediated, in part, by changes in the adipose tissue hormone leptin...
  63. Shaw D, Goldman B. Developmental changes in male Siberian hamsters (Phodopus sungorus) exposed to different gestational and postnatal photoperiods. J Pineal Res. 2007;43:25-34 pubmed
  64. Prendergast B, Pyter L, Galang J, Kay L. Reproductive responses to photoperiod persist in olfactory bulbectomized Siberian hamsters (Phodopus sungorus). Behav Brain Res. 2009;198:159-64 pubmed publisher
    ..evaluated the role of the olfactory bulbs in the photoperiodic control of reproduction in Siberian hamsters (Phodopus sungorus), an established model species for the study of neural substrates mediating seasonality...