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Hedi Raizer

Journal 6 min read

What does the research say about working memory?

Working memory is the limited-capacity system that holds and manipulates information over short intervals. This page summarises laboratory and clinical research on compounds, interventions and models reported to affect w

peptides-pro Editorial

Working memory is the cognitive system responsible for the temporary maintenance and manipulation of information needed to carry out complex tasks. It is often described as a limited-capacity workspace, distinct from long-term memory and from simple short-term storage, and it is assessed in the laboratory with delayed-match-to-sample tasks, spatial working-memory tasks such as the Y-maze, recognition-memory tasks such as novel object recognition, and, in human studies, computerised batteries measuring working memory alongside sustained attention, cognitive flexibility and inhibitory control. The evidence summarised here spans mouse models, hippocampal cell lines, and registered human trials; no single molecular identifier, sequence or formula applies to working memory as a construct, because it is a behavioural and neural phenotype rather than a compound.

The work below centres on several distinct pathways and receptor families, including mitochondrial bioenergetics and the sirtuin 1 (SIRT1) regulator axis, central CREB-BDNF signalling, neuroinflammatory signalling through non-neuronal cells, and, in a bifunctional peptide model, the neuropeptide Y4 and GLP-1 receptor families.

Research Studies

Ferulic acid eicosyl ester and cognitive flexibility in mice

Ferulic acid eicosyl ester (FAE-20) is a natural constituent of Rhodiola rosea that had previously been identified as an enhancer of simple Pavlovian conditioning in flies, bees and mice. In a mouse study, cognitive flexibility was assessed with the attentional set-shifting task (ASST), and subchronic FAE-20 treatment was investigated for effects on cognitive flexibility, working memory and spatial learning, together with potential neurobiological mechanisms [3].

Pyrroloquinoline quinone and spatial working memory in naturally aged mice

Pyrroloquinoline quinone (PQQ) was investigated in twenty-month-old naturally aged mice. PQQ supplementation improved spatial working memory and recognition memory without inducing anxiety-like behaviour, and was associated with better preservation of hippocampal neuronal integrity. In HT-22 hippocampal neuronal cells, PQQ reduced reactive oxygen species (ROS) accumulation, restored mitochondrial membrane potential, and enhanced mitochondrial respiratory capacity. Hippocampal transcriptomic analysis and upstream regulator prediction identified SIRT1 as a major regulator [4].

Glycodeoxycholic and deoxycholic bile acids and memory in adult mice

Two microbiota-derived secondary bile acids, deoxycholic acid (DCA) and glycodeoxycholic acid (GDCA), were examined for effects on memory in mice. Male and female mice received daily oral administration of DCA, GDCA or vehicle, and spatial working and reference memory (Y-maze) and recognition memory (novel object recognition task) were assessed. After testing, gene expression and signalling activity were measured in the frontal cortex and hippocampus. Administration of GDCA after 10 days disrupted recognition memory, and the study reported reduced central CREB-BDNF signalling and cytokine expression with neuroanatomical specificity [5].

Longevity interventions and short-term performance in mice

A short-term performance assay was designed to profile functional benefits and early toxicity of longevity interventions in mice over an 8-week period. Mice received one of five candidate anti-aging treatments: 17α-estradiol, rapamycin + Smer28, berberine + resveratrol, sildenafil and pinealon. The protocol longitudinally monitored body weight and temperature, and food intake, alongside performance measures [6].

Palmitoylethanolamide/luteolin and postoperative cognition in older adults

Postoperative cognitive dysfunction (POCD) is a common complication after surgery, particularly among older adults, and is characterised by cognitive impairment, reduced functional independence and decreased quality of life. Growing evidence suggests that neuroinflammation plays a relevant role in POCD development and persistence. Palmitoylethanolamide (PEA) is an endogenous lipid mediator involved in the regulation of neuroinflammatory processes through the modulation of non-neuronal cells, while luteolin is a flavonoid with antioxidant properties; under conditions of prolonged neuroinflammation, endogenous PEA levels may be insufficient to counteract pro-inflammatory processes [7].

Nutritional formulation and cognitive performance following stress exposure

A double-blind repeated-measures crossover study is evaluating a nutritional formulation, 'Think Tank', in middle-aged females (40–60 years). The study examines whether the formulation enhances cognitive performance and subjective well-being following a psychological and physical stressor, compared with placebo. Cognitive assessments examine working memory, sustained attention, cognitive flexibility and inhibitory control, alongside physiological measures [8].

Mind-body group interventions and psychological distress in young breast cancer survivors

A two-arm randomised controlled trial is assessing the feasibility of a larger, fully powered trial in younger ER+ breast cancer survivors undergoing endocrine therapy in the Deep South, and evaluating preliminary effectiveness of a breath-based group intervention, Breath-Body-Mind (BBM), a trauma-informed programme emphasising slow-paced coherent resonance breathing, on psychological and physiological outcomes. The second arm, a survivorship education programme (SEP), serves as an attention-control matched for contact time and group setting to control for placebo effects [1].

Total versus partial sleep deprivation and cognition in younger adults

A crossover study is examining how total and partial sleep deprivation affect brain function, cognitive performance, and biomarkers related to stress and inflammation in the same participants, and comparing the two conditions to determine whether they affect the brain and body differently. The findings may improve understanding of the consequences of sleep deprivation and inform strategies to reduce its negative impact on health and society [2].

Bifunctional peptide targeting neuropeptide Y4 and GLP-1 receptors in 5×FAD mice

Effective disease-modifying therapies for Alzheimer's disease remain limited. Glucagon-like peptide-1 receptor (GLP-1R) activation has shown neuroprotective potential in Alzheimer's disease, whereas the neuropeptide Y/pancreatic polypeptide-Y4 receptor (NPY/PP-Y4R) axis has been implicated in central homeostasis and inflammatory regulation. A novel bifunctional peptide predicted to target both receptor families was reported to alleviate cognitive deficits in 5×FAD mice by modulating cGAS-STING-mediated neuroinflammation [12].

Reference-only findings relevant to working memory

Additional studies support the wider picture without forming the core of this page. In adolescents with major affective disorders, relationships have been reported between childhood trauma subtypes, cognitive function, the anti-aging protein Klotho and matrix metalloproteinase-9 (MMP-9) [9]. In patients undergoing whole-brain radiotherapy, transcranial direct current stimulation was reported to enhance cognitive performance and modulate QEEG beta- and theta-band power [10]. Dietary procyanidin C1, a trimer of (-)-epicatechin units found in cocoa, grapes and apples, has been reported to improve cognitive function through microRNA-181a-5p [11].

If you are reading this for personal health reasons

The materials described on this page are sold for laboratory research only, and we do not provide dosing or medical guidance. Nothing here is a recommendation for human use. Anyone considering a compound for themselves should speak to a licensed clinician.

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