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Neural expression of sorting nexin 25 and its regulation of tyrosine receptor kinase B trafficking

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Abstract

Sorting nexin 25 (SNX25) belongs to the sorting nexin superfamily, whose members are responsible for membrane attachment to organelles of the endocytic system. Recent reports point to critical roles for SNX25 as a negative regulator of transforming growth factor β signaling, but the expression patterns of SNX25 in the central nervous system (CNS) remain almost uncharacterized. Here, we show widespread neuronal expression of SNX25 protein and Snx25 mRNA using immunohistochemistry and in situ hybridization. As an exception, SNX25 was present in the Bergmann glia of the cerebellum. SNX25 immunoreactivity was found in cholinergic and catecholaminergic neurons. Moreover, SNX25 colocalized with tropomyosin receptor kinase B (TrkB) in the neurons of the cortex and hippocampus. In vitro, SNX25 can interact with full-length TrkB, but not with its C-terminal-truncated isoform. Overexpression of SNX25 accelerated degradation of full-lengh TrkB, indicating that SNX25 promotes the trafficking of TrkB for lysosomal degradation. These findings suggest that SNX25 is a new actor in endocytic signaling, perhaps contributing to the regulation of BDNF–TrkB signaling in the CNS.

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Abbreviations

III:

Oculomotor nucleus

IV:

Trochlear nucleus

V:

Motor nucleus of trigeminal

VI:

Abducens nucleus

VII:

Facial motor nucleus

XII:

Hypoglossal nucleus

AAA:

Anterior amygdalar area

ACA:

Anterior cingulate area

ACB:

Nucleus accumbens

ACVII:

Accessory facial motor nucleus

AD:

Anterodorsal nucleus

ADP:

Anterodorsal preoptic nucleus

AHN:

Anterior hypothalamic nucleus

AI:

Agranular insular area

AM:

Anteromedial nucleus

AMB:

Nucleus ambiguus

AOB:

Accessory olfactory bulb

AON:

Anterior olfactory nucleus

AP:

Area postrema

ARH:

Arcuate hypothalamic nucleus

AT:

Anterior tegmental nucleus

AUD:

Auditory areas

AV:

Anteroventral nucleus of thalamus

AVP:

Anteroventral preoptic nucleus

AVPV:

Anteroventral periventricular nucleus

B:

Barrington's nucleus

BA:

Bed nucleus of the accessory olfactory tract

BAC:

Bed nucleus of the anterior commissure

BDNF:

Brain-derived neurotrophic factor

BLA:

Basolateral amygdalar nucleus

BMA:

Basomedial amygdalar nucleus

BST:

Bed nuclei of the stria terminalis

CA1:

Field CA1 of Ammon's horn

CA2:

Field CA2 of Ammon's horn

CA3:

Field CA3 of Ammon's horn

CBX:

Cerebellar cortex

CEA:

Central amygdalar nucleus

ChAT:

Choline acetyltransferase

CL:

Central lateral nucleus of the thalamus

CLA:

Claustrum

CLI:

Central linear nucleus raphe

CM:

Central medial nucleus of the thalamus

CN:

Cochlear nuclei

CNS:

Central nervous system

COA:

Cortical amygdalar area

CP:

Caudoputamen

CS:

Superior central nucleus raphe

CU:

Cuneate nucleus

CUN:

Cuneiform nucleus

DG:

Dentate gyrus

dHMNs:

Distal hereditary motor neuropathies

DMH:

Dorsomedial nucleus of the hypothalamus

DMX:

Dorsal motor nucleus of the vagus nerve

DN:

Dentate nucleus

DP:

Dorsal peduncular area

DR:

Dorsal nucleus raphe

DTN:

Dorsal tegmental nucleus

ECT:

Ectorhinal area

ECU:

External cuneate nucleus

EEA1:

Early endosome antigen 1

ENT:

Entorhinal area

EP:

Endopiriform nucleus

EW:

Edinger–Westphal nucleus

FC:

Fasciola cinerea

FN:

Fastigial nucleus

FRP:

Frontal pole

FS:

Fundus of striatum

GAPDH:

Glyceraldehyde-3-phosphate dehydrogenase

GR:

Gracile nucleus

GRN:

Gigantocellular reticular nucleus

GU:

Gustatory areas

HEK:

Human embryonic kidney

IA:

Intercalated amygdalar nucleus

IAD:

Interanterodorsal nucleus of the thalamus

IAM:

Interanteromedial nucleus of the thalamus

IC:

Inferior colliculus

ICB:

Infracerebellar nucleus

IF:

Interfascicular nucleus

IG:

Induseum griseum

IGL:

Intergeniculate leaflet of the lateral geniculate complex

ILA:

Infralimbic area

IMD:

Intermediodorsal nucleus of the thalamus

IO:

Inferior olivary complex

IP:

Interposed nucleus

IPN:

Interpeduncular nucleus

IRN:

Intermediate reticular nucleus

ISN:

Inferior salivatory nucleus

LA:

Lateral amygdalar nucleus

LAMP-1:

Lysosome marker lysosomal-associated membrane protein-1

LAT:

Lateral group of the dorsal thalamus

LC:

Locus coeruleus

LD:

Lateral dorsal nucleus of thalamus

LDT:

Laterodorsal tegmental nucleus

LGd:

Dorsal part of the lateral geniculate complex

LGv:

Ventral part of the lateral geniculate complex

LH:

Lateral habenula

LHA:

Lateral hypothalamic area

LIN:

Linear nucleus of the medulla

LPO:

Lateral preoptic area

LRN:

Lateral reticular nucleus

LSX:

Lateral septal complex

LT:

Lateral terminal nucleus of the accessory optic tract

MA:

Magnocellular nucleus

MARN:

Magnocellular reticular nucleus

MBO:

Mammillary body

MD:

Mediodorsal nucleus of thalamus

MDRN:

Medullary reticular nucleus

ME:

Median eminence

MEA:

Medial amygdalar nucleus

MEPO:

Median preoptic nucleus

MEV:

Midbrain trigeminal nucleus

MG:

Medial geniculate complex

MH:

Medial habenula

MO:

Somatomotor areas

MOB:

Main olfactory bulb

MPN:

Medial preoptic nucleus

MPO:

Medial preoptic area

MRN:

Midbrain reticular nucleus

MS:

Medial septal nucleus

NB:

Nucleus of the brachium of the inferior colliculus

NC:

Nucleus circularis

NDB:

Diagonal band nucleus

NI:

Nucleus incertus

NLL:

Nucleus of the lateral leminiscus

NLOT:

Nucleus of the lateral olfactory tract

NTB:

Nucleus of the trapezoid body

NTS:

Nucleus of the solitary tract

ORB:

Orbital area

OT:

Olfactory tubercle

OV:

Vascular organ of the lamina terminalis

PA:

Posterior amygdalar nucleus

PAA:

Piriform-amygdalar area

PAG:

Periaqueductal gray

PALd:

Pallidum, dorsal region

PAR:

Parasubiculum

PARN:

Parvicellular reticular nucleus

PAS:

Parasolitary nucleus

PB:

Parabrachial nucleus

PBG:

Parabigeminal nucleus

PBS:

Phosphate-buffered saline

PCG:

Pontine central gray

PCN:

Paracentral nucleus

PD:

Posterodorsal preoptic nucleus

PERI:

Perirhinal area

PF:

Parafascicular nucleus

PFA:

Paraformaldehyde

PG:

Pontine gray

PGRN:

Paragigantocellular reticular nucleus

PH:

Posterior hypothalamic nucleus

PHY:

Perihypoglossal nuclei

PIPs:

Phosphatidylinositol phosphates

PIR:

Piriform area

PL:

Prelimbic area

PMd:

Dorsal premammillary nucleus

PMv:

Ventral premammillary nucleus

POST:

Postsubiculum

PP:

Peripeduncular nucleus

PPN:

Pedunculopontine nucleus

PPY:

Parapyramidal nucleus

PR:

Perireunensis nucleus

PRE:

Presubiculum

PRNc:

Pontine reticular nucleus, caudal part

PRNr:

Pontine reticular nucleus

PRT:

Pretectal region

PS:

Parastrial nucleus

PST:

Preparasubthalamic nucleus

PSTN:

Parasubthalamic nucleus

PSV:

Principal sensory nucleus of the trigeminal

PT:

Parataenial nucleus

PTLp:

Posterior parietal association areas

PV:

Parvalbumin

Pva:

Periventricular hypothalamic nucleus, anterior part

PVH:

Paraventricular hypothalamic nucleus

PVHd:

Paraventricular hypothalamic nucleus, descending division

Pvi:

Periventricular hypothalamic nucleus, intermediate part

PVp:

Periventrucular hypothalamic nucleus, posterior part

Pvpo:

Periventrucular hypothalamic nucleus, preoptic part

PVT:

Paraventricular nucleus of the thalamus

PX:

Phox-homology

RCH:

Retrochiasmatic area

RE:

Nucleus of reuniens

RH:

Rhomboid nucleus

RL:

Rostral linear nucleus raphe

RM:

Nucleus raphe magnus

RN:

Red nucleus

RO:

Nucleus raphe obscurus

RPA:

Nucleus raphe pallidus

RPO:

Nucleus raphe pontis

RR:

Midbrain reticular nucleus, retrorubral area

RSP:

Retrosplenial area

RT:

Reticular nucleus of the thalamus

SAG:

Nucleus sagulum

SBPV:

Subparaventricular zone

SCH:

Suprachiasmatic nucleus

SCm:

Superior colliculus, motor related

SCs:

Superior colliculus, sensory related

SFO:

Subfornical organ

SG:

Supragenual nucleus

SI:

Sabstantia innominata

SLC:

Subcoeruleus nucleus

SLD:

Sublaterodorsal nucleus

SMT:

Submedial nucleus of the thalamus

SNc:

Substantia nigra, compact part

SNr:

Substantia nigra, reticular part

SNX25:

Sorting nexin 25

SNXs:

Sorting nexins

SO:

Supraoptic nucleus

SOC:

Superior olivary complex

SPA:

Subparafascicular area

SPF:

Subparafascicular nucleus

SPVC:

Spinal nucleus of the trigeminal, caudal part

SPVI:

Spinal nucleus of the trigeminal, interpolar part

SPVO:

Spinal nucleus of the trigeminal, oral part

SS:

Somatosensory areas

STN:

Subthalamic nucleus

SUB:

Subiculum

SubG:

Subgeniculate nucleus

SUT:

Supratrigeminal nucleus

TEa:

Temporal association areas

TfR:

Transferrin receptor

TGF-β:

Transforming growth factor-β

TH:

Tyrosine hydroxylase

TR:

Postpiriform transition area

TrkB:

Tropomyosin receptor kinase B

TrkB-FL:

Full-length TrkB

TrkB-T1:

C-terminally truncated isoform of TrkB

TRN:

Tegmental reticular nucleus

TRS:

Triangular nucleus of septum

TT:

Taenia tecta

TU:

Tuberal nucleus

VAL:

Ventral anterior-lateral complex of the thalamus

VAPB:

Vesicle-associated membrane protein-associated protein B

VIS:

Visual areas

VISC:

Visceral area

VLPO:

Ventrolateral preoptic nucleus

VM:

Ventral medial nucleus of the thalamus

VMH:

Ventromedial hypothalamic nucleus

VNC:

Vestibular nuclei

VP:

Ventral posterior complex of the thalamus

VTA:

Ventral tegmental area

VTN:

Ventral tegmental nucleus

x:

Nucleus x

y:

Nucleus y

ZI:

Zona incerta

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Acknowledgements

We thank Dr. Ian Smith for providing language help. This work was supported by a Scientific Research Grant from the Japan Society for the Promotion of Science [Grant Number 19K06958 to S. Takemura and 18K06836 to A. Wanaka].

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Correspondence to Shoko Takemura.

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Takemura, S., Isonishi, A., Tanaka, T. et al. Neural expression of sorting nexin 25 and its regulation of tyrosine receptor kinase B trafficking. Brain Struct Funct 225, 2615–2642 (2020). https://doi.org/10.1007/s00429-020-02144-0

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  • DOI: https://doi.org/10.1007/s00429-020-02144-0

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