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1.
Open Heart ; 11(1)2024 Jun 18.
Article in English | MEDLINE | ID: mdl-38890129

ABSTRACT

BACKGROUND: For high bleeding-risk patients (HBR) undergoing percutaneous coronary intervention (PCI), the LEADERS FREE (LF) and LEADERS FREE II (LF II) trials established the safety and efficacy of a stainless steel polymer-free biolimus-coated stent (SS-BCS) with 30 days of dual antiplatelet treatment (DAPT). The LEADERS FREE III (LF III) trial investigated clinical outcomes after PCI with the next-generation cobalt-chromium thin-strut polymer-free biolimus-coated stent (CoCr-BCS) in HBR patients. AIMS: To report the final 3-year results of the LF III trial and compare them to LF II. METHODS: LF III was a prospective, multicentre, open-label single-arm study to evaluate the safety and efficacy of the CoCr-BCS stent. The primary safety endpoint was the composite of cardiac death (CD), myocardial infarction(MI) or definite/probable stent thrombosis (ST). The primary efficacy endpoint was clinically driven target lesion revascularisation (cd-TLR). We performed a propensity-matched comparison to the 3-year outcomes of LF II. RESULTS: After 3 years, CD/MI/ST had occurred in 57 patients (15%, 95% CI 11.8% to 19%) and cd-TLR in 23 (6.2%, 95% CI 4.1% to 9.2%) patients. In a propensity-matched comparison of patients treated with the CoCr-BCS versus the SS-BCS, there were similar rates of CD (6.6% vs 7.8%, p=0.50), MI (7.1% vs 8.3%, p=0.47) and definite/probable ST (1.1% vs 2%, HR 0.56, 95% CI 0.16 to 1.93, p=0.35). The rates of cd-TLR were 5.3% with CoCr-BCS versus 9.8% with SS-BCS (HR 0.54, 95% CI 0.31 to 0.96, p=0.03). CONCLUSION: LF III confirms the long-term safety and efficacy of the CoCr-BCS in HBR patients treated with 1 month of DAPT. TRIAL REGISTRATION NUMBER: NCT02843633, NCT03118895.


Subject(s)
Coronary Artery Disease , Drug-Eluting Stents , Percutaneous Coronary Intervention , Prosthesis Design , Sirolimus , Humans , Male , Prospective Studies , Female , Percutaneous Coronary Intervention/instrumentation , Percutaneous Coronary Intervention/methods , Percutaneous Coronary Intervention/adverse effects , Sirolimus/analogs & derivatives , Sirolimus/pharmacology , Sirolimus/administration & dosage , Treatment Outcome , Coronary Artery Disease/therapy , Coronary Artery Disease/diagnosis , Aged , Time Factors , Middle Aged , Follow-Up Studies , Platelet Aggregation Inhibitors/therapeutic use , Risk Factors
2.
Cardiovasc Diagn Ther ; 14(2): 283-293, 2024 Apr 30.
Article in English | MEDLINE | ID: mdl-38716311

ABSTRACT

Background: Venous malformation (VM) is the most frequent type of congenital vascular malformation. In terms of functional outcome local sclerotherapy remains the most important therapeutic tool. For planning and correct estimation and prevention of complications, an exact anatomical classification of the VM is crucial. Not only the drainage, as assessed in the established classification, but also the phlebographic aspect of the internal VM structure itself plays a decisive role. In order to integrate this aspect, we aim to validate a proposal for a revised phlebographic VM classification distinguishing non-lacunar (a) and lacunar (b) types. Methods: We retrospectively analyzed all patients with VM in whom a direct puncture phlebography was performed in our clinic between 2009 and 2018 to assess morphology and flow characteristics. Phlebographic assessment included: (I) differentiation of non-lacunar vs. lacunar type; (II) drainage assignment according to the existing classification; (III) adjusted classification combining both. Inter-reader agreement was measured in percentage as well as by the Cohen's kappa coefficient (κ). Results: Overall 26 patients were classified as non-lacunar (a) and 41 patients as lacunar (b) VM. For this categorization, inter-reader agreement was 96% (κ=0.91). Classical Puig classification into types I, II, III and IV showed 87% inter-reader agreement (κ=0.78). For the adjusted classification adding the non-lacunar or lacunar characteristic to type I-IV an agreement of 82% (κ=0.77) was achieved. Conclusions: Phlebographic differentiation into non-lacunar and lacunar VM is feasible and reliable to distinguish phenotypic subgroups of patients with VM. We therefore propose to integrate this parameter of the internal VM structure into the existing classification.

3.
Eur J Neurosci ; 59(7): 1500-1518, 2024 Apr.
Article in English | MEDLINE | ID: mdl-38185906

ABSTRACT

Discrete alcohol cues and contexts are relapse triggers for people with alcohol use disorder exerting particularly powerful control over behaviour when they co-occur. Here, we investigated the neural substrates subserving the capacity for alcohol-associated contexts to elevate responding to an alcohol-predictive conditioned stimulus (CS). Specifically, rats were trained in a distinct 'alcohol context' to respond by entering a fluid port during a discrete auditory CS that predicted the delivery of alcohol and were familiarized with a 'neutral context' wherein alcohol was never available. When conditioned CS responding was tested by presenting the CS without alcohol, we found that augmenting glutamatergic activity in the nucleus accumbens (NAc) shell by microinfusing α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) reduced responding to an alcohol CS in an alcohol, but not neutral, context. Further, AMPA microinfusion robustly affected behaviour, attenuating the number, duration and latency of CS responses selectively in the alcohol context. Although dopaminergic inputs to the NAc shell were previously shown to be necessary for CS responding in an alcohol context, here, chemogenetic excitation of ventral tegmental area (VTA) dopamine neurons and their inputs to the NAc shell did not affect CS responding. Critically, chemogenetic excitation of VTA dopamine neurons affected feeding behaviour and elevated c-fos immunoreactivity in the VTA and NAc shell, validating the chemogenetic approach. These findings enrich our understanding of the substrates underlying Pavlovian responding for alcohol and reveal that the capacity for contexts to modulate responding to discrete alcohol cues is delicately underpinned by the NAc shell.


Subject(s)
Cues , Nucleus Accumbens , Humans , Rats , Animals , Nucleus Accumbens/physiology , Rats, Long-Evans , alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid , Ethanol/pharmacology , Conditioning, Operant/physiology
4.
J Vet Intern Med ; 37(6): 2603-2609, 2023.
Article in English | MEDLINE | ID: mdl-37675885

ABSTRACT

BACKGROUND: A recessive form of MOCOS-associated xanthinuria type II is described in Tyrolean grey cattle. A similar case was identified in a 5-month-old Brown Swiss calf with hoof overgrowth, rough coat, urine sediment, and pneumonia. HYPOTHESIS/OBJECTIVES: To characterize the disease phenotype, to evaluate its genetic etiology, and to determine the prevalence of the deleterious allele in the Brown Swiss population. ANIMALS: An affected calf, its parents, and 65 441 Swiss dairy cattle. METHODS: The affected animal was clinically examined and necropsied. Microarray genotyping was used to determine the genotypes and to assess the frequency of the MOCOS allele in a Brown Swiss control cohort. RESULTS: Ultrasonography revealed hyperechoic renal pyramids with multifocal distal shadowing and echogenic sediment in the urinary bladder. Necropsy revealed suppurative bronchopneumonia and urolithiasis. Histology revealed numerous nephroliths with multifocal chronic lymphohistiocytic interstitial infiltrates, fibrosis, tubular degeneration, chronic multifocal glomerulonephritis with sclerosis, and bilateral hydronephrosis. Dysplastic changes were observed in the corium of the claw and the cornea. Genetic testing identified the homozygous presence of a known MOCOS frameshift variant in the case. Both parents were heterozygous and the prevalence of carriers in genotyped Brown Swiss cattle was 1.4% (342/24337). CONCLUSIONS AND CLINICAL IMPORTANCE: The findings were consistent with the diagnosis of a recessive renal syndrome similar to xanthinuria type II described in Tyrolean grey cattle. The prevalence of the deleterious MOCOS allele is low in the Brown Swiss breed. However, mating of carriers should be avoided to prevent further losses.


Subject(s)
Cattle Diseases , Frameshift Mutation , Sulfurtransferases , Animals , Cattle , Cattle Diseases/epidemiology , Cattle Diseases/genetics , Genotype , Heterozygote , Homozygote , Phenotype , Sulfurtransferases/genetics
5.
J Dairy Sci ; 106(12): 8969-8978, 2023 Dec.
Article in English | MEDLINE | ID: mdl-37641348

ABSTRACT

Shortening of the mandible (brachygnathia inferior) is a congenital, often inherited and variably expressed craniofacial anomaly in domestic animals including cattle. Brachygnathia inferior can lead to poorer animal health and welfare and reduced growth, which ultimately affects productivity. Within the course of the systematic conformation scoring, cases with a frequency of about 0.1% were observed in the Brown Swiss cattle population of Switzerland. In contrast, this anomaly is almost unknown in the Original Braunvieh population, representing the breed of origin. Because none of the individually examined 46 living offspring of our study cohort of 145 affected cows showed the trait, we can most likely exclude a monogenic-dominant mode of inheritance. We hypothesized that either a monogenic recessive or a complex mode of inheritance was underlying. Through a genome-wide association study of 145 cases and 509 controls with imputed 624k SNP data, we identified a 4.5 Mb genomic region on bovine chromosome 5 significantly associated with this anomaly. This locus was fine-mapped using whole-genome sequencing data. A run of homozygosity analysis revealed a critical interval of 430 kb. A breed specific frameshift duplication in WNT10B (rs525007739; c.910dupC; p.Arg304ProfsTer14) located in this genomic region was found to be associated with a 21.5-fold increased risk of brachygnathia inferior in homozygous carriers. Consequently, we present for the first time a genetic locus associated with this well-known anomaly in cattle, which allows DNA-based selection of Brown Swiss animals at decreased risk for mandibular shortening. In addition, this study represents the first large animal model of a WNT10B-related inherited developmental disorder in a mammalian species.


Subject(s)
Genome-Wide Association Study , Genome , Animals , Cattle , Female , Genome-Wide Association Study/veterinary , Genotype , Homozygote , Phenotype , Polymorphism, Single Nucleotide , Proto-Oncogene Proteins , Wnt Proteins
6.
Anim Genet ; 54(5): 613-618, 2023 Oct.
Article in English | MEDLINE | ID: mdl-37313694

ABSTRACT

In about 90% of multiple pregnancies in cattle, shared blood circulation between fetuses leads to genetic chimerism in peripheral blood and can reduce reproductive performance in heterosexual co-twins. However, the early detection of heterosexual chimeras requires specialized tests. Here, we used low-pass sequencing data with a median coverage of 0.64× generated from blood samples of 322 F1 crosses between beef and dairy cattle and identified 20 putative blood chimeras through increased levels of genome-wide heterozygosity. In contrast, for 77 samples with routine SNP microarray data generated from hair bulbs of the same F1s, we found no evidence of chimerism, simultaneously observing high levels of genotype discordance with sequencing data. Fifteen out of 18 reported twins showed signs of blood chimerism, in line with previous reports, whereas the presence of five alleged singletons with strong signs of chimerism suggests that the in-utero death rate of co-twins is at the upper limit of former estimates. Together, our results show that low-pass sequencing data allow reliable screening for blood chimeras. They further affirm that blood is not recommended as a source of DNA for the detection of germline variants.


Subject(s)
Chimerism , DNA , Pregnancy , Female , Cattle/genetics , Animals , Genotype , Heterozygote , Hair Follicle
9.
Behav Brain Res ; 440: 114248, 2023 02 25.
Article in English | MEDLINE | ID: mdl-36496079

ABSTRACT

Extinction is a fundamental form of inhibitory learning that is important for adapting to changing environmental contingencies. While numerous studies have investigated the neural correlates of extinction using Pavlovian fear conditioning and appetitive operant reward-seeking procedures, less is known about the neural circuitry mediating the extinction of appetitive Pavlovian responding. Here, we aimed to generate an extensive brain activation map of extinction learning in a rat model of appetitive Pavlovian conditioning. Male Long-Evans rats were trained to associate a conditioned stimulus (CS; 20 s white noise) with the delivery of a 10% sucrose unconditioned stimulus (US; 0.3 ml/CS) to a fluid port. Control groups also received CS presentations, but sucrose was delivered either during the inter-trial interval or in the home-cage. After conditioning, 1 or 6 extinction sessions were conducted in which the CS was presented but sucrose was withheld. We performed Fos immunohistochemistry and network connectivity analyses on a set of cortical, striatal, thalamic, and amygdalar brain regions. Neural activity in the prelimbic cortex, ventral orbitofrontal cortex, nucleus accumbens core, and paraventricular nucleus of the thalamus was greater during recall relative to extinction. Conversely, prolonged extinction following 6 sessions induced increased neural activity in the infralimbic cortex, medial orbitofrontal cortex, and nucleus accumbens shell compared to home-cage controls. All these structures were similarly recruited during recall on the first extinction session. These findings provide novel evidence for the contribution of brain areas and neural networks that are differentially involved in the recall versus extinction of appetitive Pavlovian conditioned responding.


Subject(s)
Brain , Prefrontal Cortex , Rats , Male , Animals , Rats, Long-Evans , Prefrontal Cortex/physiology , Brain/physiology , Mental Recall , Sucrose , Extinction, Psychological/physiology
10.
Psychopharmacology (Berl) ; 240(3): 393-416, 2023 Mar.
Article in English | MEDLINE | ID: mdl-36264342

ABSTRACT

RATIONALE: Alcohol use is reliably preceded by discrete and contextual stimuli which, through diverse learning processes, acquire the capacity to promote alcohol use and relapse to alcohol use. OBJECTIVE: We review contemporary extinction, renewal, reinstatement, occasion setting, and sex differences research within a conditioning framework of relapse to alcohol use to inform the development of behavioural and pharmacological therapies. KEY FINDINGS: Diverse learning processes and corresponding neurobiological substrates contribute to relapse to alcohol use. Results from animal models indicate that cortical, thalamic, accumbal, hypothalamic, mesolimbic, glutamatergic, opioidergic, and dopaminergic circuitries contribute to alcohol relapse through separable learning processes. Behavioural therapies could be improved by increasing the endurance and generalizability of extinction learning and should incorporate whether discrete cues and contexts influence behaviour through direct excitatory conditioning or occasion setting mechanisms. The types of learning processes that most effectively influence responding for alcohol differ in female and male rats. CONCLUSION: Sophisticated conditioning experiments suggest that diverse learning processes are mediated by distinct neural circuits and contribute to relapse to alcohol use. These experiments also suggest that gender-specific behavioural and pharmacological interventions are a way towards efficacious therapies to prevent relapse to alcohol use.


Subject(s)
Alcohol Drinking , Extinction, Psychological , Rats , Female , Male , Animals , Ethanol/pharmacology , Cues , Models, Animal , Recurrence , Conditioning, Operant
12.
Anim Genet ; 53(5): 557-569, 2022 Oct.
Article in English | MEDLINE | ID: mdl-35748198

ABSTRACT

Twin and multiple births have negative effects on the performance and health of cows and calves. To decipher the genetic architecture of this trait in the two Swiss Brown Swiss cattle populations, we performed various association analyses based on de-regressed breeding values. Genome-wide association analyses were executed using ~600 K imputed SNPs for the maternal multiple birth trait in ~3500 Original Braunvieh and ~7800 Brown Swiss animals. Significantly associated QTL were observed on different chromosomes for both breeds. We have identified on chromosome 11 a QTL that explains ~6% of the total genetic variance of the maternal multiple birth trait in Original Braunvieh. For the Brown Swiss breed, we have discovered a QTL on chromosome 15 that accounts for ~4% of the total genetic variance. For Original Braunvieh, subsequent haplotype analysis revealed a 90-kb window on chromosome 11 at 88 Mb, where a likely regulatory region is located close to the ID2 gene. In Brown Swiss, a 130-kb window at 75 Mb on chromosome 15 was identified. Analysis of whole-genome sequence data using linkage-disequilibrium estimation revealed possible causal variants for the identified QTL. A presumably regulatory variant in the non-coding 5' region of the ID2 gene was strongly associated with the haplotype for Original Braunvieh. In Brown Swiss, an intron variant in PRDM11, one 3' UTR variant in SYT13 and three intergenic variants 5' upstream of SYT13 were identified as candidate variants for the trait multiple birth maternal. In this study, we report for the first time QTL for the trait of multiple births in Original Braunvieh and Brown Swiss cattle. Moreover, our findings are another step towards a better understanding of the complex genetic architecture of this polygenic trait.


Subject(s)
Genome-Wide Association Study , Multiple Birth Offspring , Pregnancy, Animal , Quantitative Trait Loci , Animals , Cattle/genetics , Chromosomes , Female , Genome-Wide Association Study/veterinary , Polymorphism, Single Nucleotide , Pregnancy , Pregnancy, Animal/genetics , Synaptotagmins/genetics
14.
Anim Genet ; 53(3): 427-435, 2022 Jun.
Article in English | MEDLINE | ID: mdl-35451516

ABSTRACT

Sequence variations in the melanocortin-1 receptor (MC1R) gene are associated with melanism in different animal species. Six functionally relevant alleles have been described in cattle to date. In a hypothesis-free approach we performed a genome-wide allelic association study with black, red and wild-coloured cattle of three Alpine cattle breeds (Eringer, Evolèner and Valdostana), revealing a single significant association signal close to the MC1R gene. We searched for candidate causative variants by sequencing the entire coding sequence and identified two novel protein-changing variants. We propose designating the mutant alleles at MC1R:c.424C>T as ev1 and at MC1R:c.263G>A as ev2 . Both affect conserved amino acid residues in functionally important transmembrane domains (p.Arg142Cys and p.Ser88Asn). Both alleles segregate predominantly in the Swiss Evolèner breed. They occur in other European cattle breeds such as Abondance and Rotes Höhenvieh as well. We observed almost perfect association between the MC1R genotypes and the coat colour phenotype in a cohort of 513 black, red and wild-coloured cattle. Animals carrying two copies of MC1R loss-of-function alleles or that were compound heterozygous for e, ev1 , or ev2 have a red to dark red (chestnut-like red) coat colour. These findings expand the spectrum of causal MC1R variants causing recessive red in cattle.


Subject(s)
Hair Color , Receptor, Melanocortin, Type 1 , Alleles , Animals , Breeding , Cattle/genetics , Genotype , Hair Color/genetics , Humans , Phenotype , Receptor, Melanocortin, Type 1/genetics
15.
Sci Rep ; 12(1): 5435, 2022 03 31.
Article in English | MEDLINE | ID: mdl-35361830

ABSTRACT

Mendelian variants can determine both insemination success and neonatal survival and thus influence fertility and rearing success of cattle. We present 24 deficient homozygous haplotype regions in the Holstein population of Switzerland and provide an overview of the previously identified haplotypes in the global Holstein breed. This study encompasses massive genotyping, whole-genome sequencing (WGS) and phenotype association analyses. We performed haplotype screenings on almost 53 thousand genotyped animals including 114 k SNP data with two different approaches. We revealed significant haplotype associations to several survival, birth and fertility traits. Within haplotype regions, we mined WGS data of hundreds of bovine genomes for candidate causal variants, which were subsequently evaluated by using a custom genotyping array in several thousand breeding animals. With this approach, we confirmed the known deleterious SMC2:p.Phe1135Ser missense variant associated with Holstein haplotype (HH) 3. For two previously reported deficient homozygous haplotypes that show negative associations to female fertility traits, we propose candidate causative loss-of-function variants: the HH13-related KIR2DS1:p.Gln159* nonsense variant and the HH21-related NOTCH3:p.Cys44del deletion. In addition, we propose the RIOX1:p.Ala133_Glu142del deletion as well as the PCDH15:p.Leu867Val missense variant to explain the unexpected low number of homozygous haplotype carriers for HH25 and HH35, respectively. In conclusion, we demonstrate that with mining massive SNP data in combination with WGS data, we can map several haplotype regions and unravel novel recessive protein-changing variants segregating at frequencies of 1 to 5%. Our findings both confirm previously identified loci and expand the spectrum of undesired alleles impairing reproduction success in Holstein cattle, the world's most important dairy breed.


Subject(s)
Fertility , Alleles , Animals , Cattle/genetics , Female , Fertility/genetics , Genotype , Haplotypes , Homozygote
16.
Genet Sel Evol ; 54(1): 18, 2022 Mar 07.
Article in English | MEDLINE | ID: mdl-35255804

ABSTRACT

BACKGROUND: Semen quality and insemination success are monitored in artificial insemination bulls to ensure high male fertility rates. Only ejaculates that fulfill minimum quality requirements are processed and eventually used for artificial inseminations. We examined 70,990 ejaculates from 1343 Brown Swiss bulls to identify bulls from which all ejaculates were rejected due to low semen quality. This procedure identified a bull that produced 12 ejaculates with an aberrantly small number of sperm (0.2 ± 0.2 × 109 sperm per mL) which were mostly immotile due to multiple morphological abnormalities. RESULTS: The genome of this bull was sequenced at a 12× coverage to investigate a possible genetic cause. Comparing the sequence variant genotypes of this bull with those from 397 fertile bulls revealed a 1-bp deletion in the coding sequence of the QRICH2 gene which encodes the glutamine rich 2 protein, as a compelling candidate causal variant. This 1-bp deletion causes a frameshift in translation and a premature termination codon (ENSBTAP00000018337.1:p.Cys1644AlafsTer52). The analysis of testis transcriptomes from 76 bulls showed that the transcript with the premature termination codon is subject to nonsense-mediated mRNA decay. The 1-bp deletion resides in a 675-kb haplotype that includes 181 single nucleotide polymorphisms (SNPs) from the Illumina BovineHD Bead chip. This haplotype segregates at a frequency of 5% in the Brown Swiss cattle population. Our analysis also identified another bull that carried the 1-bp deletion in the homozygous state. Semen analyses from the second bull confirmed low sperm concentration and immotile sperm with multiple morphological abnormalities that primarily affect the sperm flagellum and, to a lesser extent, the sperm head. CONCLUSIONS: A recessive loss-of-function allele of the bovine QRICH2 gene likely causes low sperm concentration and immotile sperm with multiple morphological abnormalities. Routine sperm analyses unambiguously identify homozygous bulls for this allele. A direct gene test can be implemented to monitor the frequency of the undesired allele in cattle populations.


Subject(s)
Oligospermia , Semen Analysis , Animals , Cattle/genetics , Fertility/genetics , Insemination, Artificial/veterinary , Male , Semen Analysis/veterinary , Spermatozoa
17.
Anim Genet ; 53(3): 416-421, 2022 Jun.
Article in English | MEDLINE | ID: mdl-35233794

ABSTRACT

Inherited forms of cataract are a heterogeneous group of eye disorders known in livestock species. Clinicopathological analysis of a single case of impaired vision in a newborn Original Braunvieh calf revealed nuclear cataract. Whole-genome sequencing of the parent-offspring trio revealed a de novo mutation of ADAMTSL4 in this case. The heterozygous p.Arg776His missense variant affects a conserved residue of the ADAMTSL4 gene that encodes a secreted glycoprotein expressed in the lens throughout embryonic development. In humans, ADAMTSL4 genetic variants cause recessively inherited forms of subluxation of the lens. Given that ADAMTSL4 is a functional candidate gene for inherited disorders of the lens, we suggest that heterozygosity for the identified missense variant may have caused the congenital cataract in the affected calf. Cattle populations should be monitored for unexplained cataract cases, with subsequent DNA sequencing a hypothesized pathogenic effect of heterozygous ADAMTSL4 variants could be confirmed.


Subject(s)
Cataract , Cattle Diseases , Animals , Cataract/genetics , Cataract/veterinary , Cattle/genetics , Cattle Diseases/genetics , Mutation, Missense , Pedigree , Whole Genome Sequencing
18.
Neurosci Biobehav Rev ; 135: 104569, 2022 04.
Article in English | MEDLINE | ID: mdl-35131398

ABSTRACT

Emerging evidence implicates rodent medial prefrontal cortex (mPFC) in tasks requiring adaptation of behavior to changing information from external and internal sources. However, the computations within mPFC and subsequent outputs that determine behavior are incompletely understood. We review the involvement of mPFC subregions, and their projections to the striatum and amygdala in two broad types of tasks in rodents: 1) appetitive and aversive Pavlovian and operant conditioning tasks that engage mPFC-striatum and mPFC-amygdala circuits, and 2) foraging-based tasks that require decision making to optimize reward. We find support for region-specific function of the mPFC, with dorsal mPFC and its projections to the dorsomedial striatum supporting action control with higher cognitive demands, and ventral mPFC engagement in translating affective signals into behavior via discrete projections to the ventral striatum and amygdala. However, we also propose that defined mPFC subdivisions operate as a functional continuum rather than segregated functional units, with crosstalk that allows distinct subregion-specific inputs (e.g., internal, affective) to influence adaptive behavior supported by other subregions.


Subject(s)
Prefrontal Cortex , Rodentia , Adaptation, Psychological , Animals , Conditioning, Operant , Humans , Reward
19.
J Neurosci ; 42(5): 834-849, 2022 02 02.
Article in English | MEDLINE | ID: mdl-34880119

ABSTRACT

The capacity to suppress learned responses is essential for animals to adapt in dynamic environments. Extinction is a process by which animals learn to suppress conditioned responding when an expected outcome is omitted. The infralimbic (IL) cortex to nucleus accumbens shell (NAcS) neural circuit is implicated in suppressing conditioned responding after extinction, especially in the context of operant cocaine-seeking behavior. However, the role of the IL-to-NAcS neural circuit in the extinction of responding to appetitive Pavlovian cues is unknown, and the psychological mechanisms involved in response suppression following extinction are unclear. We trained male Long Evans rats to associate a 10 s auditory conditioned stimulus (CS; 14 trials per session) with a sucrose unconditioned stimulus (US; 0.2 ml per CS) in a specific context, and then following extinction in a different context, precipitated a renewal of CS responding by presenting the CS alone in the original Pavlovian conditioning context. Unilateral, optogenetic stimulation of the IL-to-NAcS circuit selectively during CS trials suppressed renewal. In a separate experiment, IL-to-NAcS stimulation suppressed CS responding regardless of prior extinction and impaired extinction retrieval. Finally, IL-to-NAcS stimulation during the CS did not suppress the acquisition of Pavlovian conditioning but was required for the subsequent expression of CS responding. These results are consistent with multiple studies showing that the IL-to-NAcS neural circuit is involved in the suppression of operant cocaine-seeking, extending these findings to appetitive Pavlovian cues. The suppression of appetitive Pavlovian responding following IL-to-NAcS circuit stimulation, however, does not appear to be an extinction-dependent process.SIGNIFICANCE STATEMENT Extinction is a form of inhibitory learning through which animals learn to suppress conditioned responding in the face of nonreinforcement. We investigated the role of the IL cortex inputs to the NAcS in the extinction of responding to appetitive Pavlovian cues and the psychological mechanisms involved in response suppression following extinction. Using in vivo optogenetics, we found that stimulating the IL-to-NAcS neural circuit suppressed context-induced renewal of conditioned responding after extinction. In a separate experiment, stimulating the IL-to-NAcS circuit suppressed conditioned responding in an extinction-independent manner. These findings can be used by future research aimed at understanding how corticostriatal circuits contribute to behavioral flexibility and mental disorders that involve the suppression of learned behaviors.


Subject(s)
Appetitive Behavior/physiology , Conditioning, Classical/physiology , Corpus Striatum/physiology , Nerve Net/physiology , Prefrontal Cortex/physiology , Animals , Corpus Striatum/chemistry , Extinction, Psychological/physiology , Male , Nerve Net/chemistry , Optogenetics/methods , Prefrontal Cortex/chemistry , Rats , Rats, Long-Evans
20.
Telemed J E Health ; 28(5): 654-665, 2022 05.
Article in English | MEDLINE | ID: mdl-34382821

ABSTRACT

Background: There is currently little scientific evidence on the usefulness of implementing strategies against COVID-19 remotely with the help of telemedicine. Objective: Evaluate whether teleconsultation is helpful as an instrument of mediated care in the monitoring and follow-up of individuals with high suspicion of COVID-19 through early detection by the Call Center COVID-19 of the Ministry of Health and Sports, Bolivia. Methodology: Descriptive and cross-sectional observational study of patients captured by the Call Center-COVID-19, who were monitored and followed up in their homes through teleconsultations carried out by the National TeleHealth Program, remotely through information and communication technologies throughout the Bolivian territory during the first 100 days of its implementation. Results: A total of 3,278 patients were studied, recruited between March 16 and June 23, 2020; 49.4% were women, with an overall mean age of 37.5 years (standard deviation [SD] 15.2). The mean detection time was 7.6 days (SD 6.92); 93.8% required home isolation, and only 6.2% were transferred for hospitalization. The mean follow-up time for all patients was 6.7 days (SD 4.87; range 2-38). A total of 75.6% were discharged as recovered patients, and 1.9% died. Conclusions: Early detection of individuals with suspected COVID-19 was achieved, knowing their clinical evolution until their recovery or death. Teleconsultations showed good outcomes at discharge and low fatal outcomes. From these results, it can be inferred that teleconsultation is a valuable tool in the monitoring, evaluation, and follow-up of patients. The Ministry of Health and Sports through Call Center-COVID-19 reinforced the Epidemiological Surveillance System as a passive search tool for possible suspected cases at the national level and decongesting other services in charge of this task.


Subject(s)
COVID-19 , Call Centers , Remote Consultation , Telemedicine , Adult , Bolivia/epidemiology , COVID-19/epidemiology , Cross-Sectional Studies , Female , Humans , Male
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