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Relationship between cognitive function and regulation of cerebral blood flow

Abstract

Ageing is the primary risk factor for cognitive deterioration. Given that the cerebral blood flow (CBF) or regulation of cerebral circulation is attenuated in the elderly, it could be expected that ageing-induced cognitive deterioration may be affected by a decrease in CBF as a result of brain ischemia and energy depletion. CBF regulation associated with cerebral metabolism thus likely plays an important role in the preservation of cognitive function. However, in some specific conditions (e.g. during exercise), change in CBF does not synchronize with that of cerebral metabolism. Our recent study demonstrated that cognitive function was more strongly affected by changes in cerebral metabolism than by changes in CBF during exercise. Therefore, it remains unclear how an alteration in CBF or its regulation affects cognitive function. In this review, I summarize current knowledge on previous investigations providing the possibility of an interaction between regulation of CBF or cerebral metabolism and cognitive function.

Introduction

It is generally believed that risk factors for the development of dementia include ageing, family history, low levels of physical activity, education, and the presence of the epsilon 4 allele of the apolipoprotein E (ApoE 4) gene [17, 27, 32, 62, 66, 75]. However, the physiological mechanism of alteration in cognitive function remains unknown.

Recently, some clinical investigations have highlighted the significant contribution of cerebral and vascular diseases in the development of cognitive dysfunction and dementia [62]. It is well known that these diseases also alter cerebral blood flow (CBF) regulation chronically. In addition, the previous studies [1, 9, 30, 55, 69, 73, 74] in healthy subjects demonstrated that several specific conditions (e.g., exercise, hypoxia, heat stress etc.) affect cognitive function with change in CBF. Under these conditions, it could be expected that CBF and its regulation may be a key factor in altering cognitive function. However, it remains unclear how an alteration in CBF and its regulation affects cognitive function. First of all, I summarize recent clinical and physiological investigations, suggesting that change in CBF affects cognitive function.

Cognitive dysfunction occurs with high risk factors for cerebral or vascular diseases

Dementia often occurs together with stroke, and the prevalence of cognitive impairment after stroke is high, particularly after stroke recurrence. However, the mechanism linking stroke to cognitive impairment or dementia remains unclear.

A previous study by Hennerici [20] proposed two different hypotheses for the mechanism of stroke-induced dementia. One hypothesis is that the central role of the stroke itself is related to the development of cognitive impairment, indicating that brain metabolic function associated with stroke itself may interact with cognitive function. The other involves the role of stroke-related deterioration of pre-existing systemic vascular factors, rather than the role of the stroke alone. Indeed, it has been suggested that vascular risk factors for cerebral or vascular disease including hypertension, atherosclerosis, diabetes mellitus, high cholesterol, atrial fibrillation, dyslipidemia, smoking, obesity, and alcohol consumption are associated with cognitive impairment [62]. Interestingly, maintaining ideal vascular health from young adulthood to middle age could be related to better cognitive performance later in life [58]. These findings support the second hypothesis of Hennerici [20] and suggest that cognitive function or the pathogenesis of dementia may be more affected by chronic alteration in vascular risk factors associated with cerebral or vascular disease rather than these diseases alone.

The mechanisms of cerebral and cardiovascular disease risk factor-induced cognitive dysfunction or dementia

Autonomic function could be a predictor of cognitive impairment as it is one of the fundamental homeostatic mechanisms for regulating blood pressure and metabolic rate [8, 61]. Indeed, abnormal autonomic function, including parasympathetic depression and sympathetic exacerbation, has been reported in patients with Alzheimer’s disease [10]. Also, associations between autonomic nervous system dysfunction and dementia [12, 70] or memory impairment [65, 72] have been reported.

Beside autonomic dysfunction, the high risk factors for cerebral or vascular disease also impair regulation of CBF. For example, hypertension results in vascular hypertrophy and remodeling and promotes atherosclerosis in large cerebral arteries and lipohyalinosis in penetrating arterioles [11, 13]. These structural vascular alterations facilitate vascular occlusions and compromise cerebral perfusion as well as the function of cerebral blood vessels, including impairments in endothelium-dependent relaxation [14] and cerebrovascular autoregulation [53]. In addition to abnormal vasculature, resting CBF, metabolism, and cognitive function are reduced in patients with hypertension [16]. On the other hand, atherosclerosis causes irregular vessel lumens, compression or local thickness, which alters smooth blood flow pattern [37]. In addition, the autonomic nervous system affects dynamic CBF regulation [45, 52, 79]. Ogoh et al. [45, 50] have examined CBF responses to acute hypotension with alpha (1)-adrenoreceptor blockade (prazosin) and strongly suggested that in humans sympathetic neural control of the cerebral vasculature provides dynamic functional control of CBF. Considering this evidence, it is highly likely that alteration in vascular risk factor-induced attenuation in CBF or dysfunction of CBF regulation is associated with cognitive function.

An adequate global CBF is needed for an increasing regional CBF for neural coupling to maintain brain function; does global CBF affect regional CBF for neural coupling?

The brain always requires a continuous supply of glucose and oxygen from the cerebral circulation in order to maintain brain function because its energy reserve is relatively small. The close spatial and temporal relationship between neural activity and regional CBF is termed “neurovascular coupling.” During synaptic activity, a sudden increase in the demand for energy could result in a relative lack of oxygen and glucose in the brain. Thus, it is thought that cognitive function is determined by an adequate increase in regional CBF for neural coupling.

It is well established that CBF is altered under a number of conditions [41,42,43, 47, 49, 63], and the CBF responses to physiological stress may be important to maintain brain metabolism and function [4]. In contrast, disrupted interaction between neural activity and global CBF may contribute to brain dysfunction. Indeed, cerebrovascular dysfunction often precedes the onset of cognitive impairment, suggesting its role in the mechanism of dementia [22].

The increase in regional CBF in the posterior parietal and thalamic areas is attenuated during cognitive tasks in patients with untreated chronic hypertension [26]. Similarly, the increase in regional CBF produced with a simple motor task (hand grip or finger tapping) is attenuated in patients with ischemic stroke [29], lacunar strokes causing limb weakness [54], and extracranial or intracranial artery disease [18]. Neural impairment also corresponds with the severity of cortical ischemia [4]. Interestingly, mechanical occlusion of both intracranial carotid arteries and one vertebral artery decreases regional CBF response to a simple motor task [60]. These findings indicate, thus, that global or focal cerebral ischemia exerts profound influences on the regional CBF regulation associated with neurovascular coupling. In patients with dementia, cerebrovascular structure was shown to be altered; as a result, the number of cerebral microvessels reduced, and flattened endothelial cells and smooth muscle cell degeneration occurred [15]. In addition, resting CBF is reduced, and the increase in regional CBF produced due to several physiological stimuli is attenuated in patients with Alzheimer’s disease [21, 35, 76]. These findings provide the evidence that the regulation of global CBF affects the response of regional CBF to neural coupling.

In patients with Alzheimer’s disease, dysregulation of the cerebral circulation, including endothelium-dependent responses [23], functional hyperemia [40], cerebral autoregulation [38], and responses to vasoconstrictors [39], occurs. The reduction in cerebral perfusion may attenuate cerebral protein synthesis and can thus promote ischemic lesions, which act synergistically with amyloid β-peptide (Aβ) to exacerbate the dementia [22]. An increase in Aβ levels in the neuropil (neuritic plaques) and blood vessels (amyloid angiopathy) is a characteristic of patients with Alzheimer’s disease [64]. Furthermore, insufficient CBF may alter Aβ trafficking across the blood–brain barrier [80], and reduced CBF may slow down Aβ clearance and promote its accumulation in the brain. Altogether, this previous research provides the possibility that structural and functional alterations of the cerebral microvasculature could affect resting CBF or regional CBF regulation and consequently contribute to the mechanisms of brain dysfunction underlying dementia.

Alteration in CBF regulation also affects cognitive function without high risk factors for cerebral or vascular disease

Many previous investigations regarding high risk factors for cerebral or vascular diseases and neural coupling provided the possibility that inadequate global CBF supply appears to cause brain dysfunction, subsequently resulting in dementia. Thus, it is expected that adequate CBF regulation is an important physiological factor for maintaining brain function. However, these clinical investigations could not provide the evidence that change in CBF affects cognitive function because many physiological factors modify cognitive function chronically in patients with cerebral or vascular disease, or dementia. In this section, I would like to discuss the research which investigated the effect on cognitive function of an alteration in CBF or its regulation (i.e., cerebral metabolism) under several conditions without any diseases. I believe that data from this research could provide important information about the relationship between CBF and cognitive function.

The alteration in CBF and its regulation during several physiological stresses likely affects cognitive function

The transient occlusion of CBF in patients with vascular disease was shown to reversibly impair cognition [33]. This finding suggests that an acute change in CBF modifies cognitive function; however, this response may be specific to these patients.

It has been reported that several physiological stresses affect cognitive function with the alteration in CBF and its regulation. For example, heat stress resulted in an expected decrease in anterior CBF [48] and caused cognitive impairment [30, 67, 69]. In addition, an oleuropein (a free radical scavenger)-induced decrease in oxidative stress attenuated cognitive function [1, 55]. Similarly, high-altitude exposure impaired cognitive function [9, 73, 74]. These findings of previous studies likely suggest that decrease in CBF is a key factor in determining cognitive function during these conditions. However, under hypoxic conditions, CBF increases acutely to preserve oxygen delivery to the brain [41] and to modify the systemic vascular system [28]. Hypoxia also affects other physiological factors [41, 42] as is the case with cerebral or vascular disease; thus, the relationship between the CBF response and cognitive function during hypoxia remains controversial. It remains difficult to identify the direct effect of change in CBF on cognitive function because studies on healthy individuals have not manipulated changes in CBF. However, these findings provide the possibility that acute alteration in CBF may affect cognitive function even without risk factors for cerebral or vascular disease.

An isolated change in CBF by manipulating cerebral perfusion does not affect cognitive function

With this in mind, we recently for the first time examined the effect of an isolated change in CBF on cognitive function in humans by manipulating CBF [51]. During dynamic exercise at mild to moderate intensity, increases in cerebral metabolism or cerebral neural activity [24, 42, 43] are paralleled by transient increases in CBF [19, 44, 46, 63]. Indeed, cognitive function improves during a single bout of moderate exercise [3, 34]. In contrast, during prolonged dynamic exercise, CBF gradually decreases toward resting values, and this is associated with hyperventilation [46]. Thus, in this study, we hypothesized that cognitive function is impaired in response to a decrease in CBF during prolonged exercise, and it can be restored with an artificial increase in CBF. However, in contrast to our hypothesis, cognitive function has been found to improve during prolonged exercise despite a decrease in CBF [51]. In addition, unexpectedly, an isolated change (hypercapnia-induced increase) in CBF by manipulating cerebral perfusion did not affect cognitive function at rest or during exercise (Fig. 1). These findings suggest that exercise-induced improvement in cognitive function is not simply due to change in global CBF. Thus, these findings suggest that another factor modified by exercise, rather than change in CBF, affects cognitive function. However, the mechanism of exercise-induced improvement in cognitive function remains unknown.

Fig. 1
figure 1

(Modified from Ogoh et al., Physiol Rep, 2014)

Despite a decrease in the mean blood flow velocity in the middle cerebral artery (MCA V mean), the reaction time of the Stroop test gradually decreased during prolonged exercise (50 min), indicating that cognitive function improves. In addition, the hypercapnia-induced increase in MCA V mean did not alter the reaction time at rest or during exercise [51]

Cerebral metabolism may be important for determining cognitive function, rather than change in CBF

Prolonged exercise [49, 51] or exercise under mild normobaric hypoxia induced a decrease in cerebral oxygenation [2] but these conditions did not impair cognitive function in healthy young subjects. These findings suggest that with respect to cognitive function, an alteration in CBF with decreased oxygen delivery to the brain may not correspond to cerebral metabolism or cognitive function. Indeed, previous studies demonstrated that during heavy exercise, compensatory increases in the uptake (arterial-venous difference) of lactate, glucose, and oxygen support the elevation of brain neural activity and metabolism when CBF decreases [24]. Considering that increases in brain neural activity and metabolism are not consistent with increases in CBF [36], cognitive function may be affected by extensive activation of motor and sensory systems due to the higher-order function of the prefrontal cortex, rather than by cerebral perfusion during exercise. On the other hand, more recently, we have demonstrated that cognitive function during exercise may be related to change in blood lactate concentration [71]. In our study, prolonged exercise improved cognitive function, but repeated (2nd) prolonged exercise attenuated this cognitive improvement along with a lack of blood lactate accumulation (Fig. 2). This finding indicates that neuro-humoral and metabolite responses, rather than a change in CBF, are associated with cognitive function during and after exercise.

Fig. 2
figure 2

(Modified from Tsukamoto et al., Physiol & Behav, 2016b)

Each subject performed high-intensity interval cycling exercises (HIIE), which consisted of four 4-min bouts at 90% peak oxygen uptake (O2) with a 3-min active recovery period at 60% peak O2. After the first HIIE, executive function (EF) significantly improved and the improved EF was sustained during 40 min of post-exercise recovery. However, repeated bouts of HIIE, which decreased lactate accumulation, dampened the positive effect of exercise on EF during the post-exercise recovery [71]

Moreover, another previous study [25] demonstrated that cognitive function is associated with type of food intake. Cognitive function decline throughout the morning is significantly reduced following intake of a low glycemic index cereal as compared with that of a high glycemic index cereal. These findings suggest that even an acute change in cerebral metabolism associated with food intake may affect cognitive function.

It also has been reported that intravenously or intranasally administered insulin improves cognitive function (memory) in patients with dementia [7, 56, 57]. Insulin resistance is linked to an increased risk for both Alzheimer’s disease [6, 77] and cognitive decline [77, 78]. Although the mechanistic relationship between insulin resistance and cognitive decline remains unclear, it has been reported that insulin signaling is linked to neurotransmission [68] and is impaired in the postmortem brain of individuals with Alzheimer’s disease [31]. However, some previous studies did not show the beneficial effects of insulin on Alzheimer’s disease; insulin’s therapeutic effects may not improve cognitive function in apolipoprotein E (APOE) ε4 carriers [59]. Furthermore, the relationship between circulating insulin, cognition, and brain structure may differ between individuals with normal cognition and Alzheimer’s disease [5]. However, regarding therapy for preventing the acceleration of cognitive dysfunction in patients with dementia, control of their cerebral metabolism (via exercise, diet, administered insulin, and so on) may be important.

Summary

Clinical research provides the possibility that impaired CBF and its regulation causes cognitive dysfunction or dementia. On the other hand, some previous studies in healthy individuals demonstrated that cognitive function is associated with acute change in CBF during some physiological stresses. However, our recent study demonstrated acute change in CBF did not affect cognitive function. Cerebral metabolism may be an important physiological factor that determines cognitive function rather than CBF, although it is also affected by acute or chronic change in CBF. However, we do not have any evidence regarding the physiological mechanism of onset of dementia or cognitive dysfunction from previous investigations. Thus, further studies are needed to identify the relationships between cerebral metabolism, CBF, its regulation, and cognitive function in order to prevent cognitive dysfunction or dementia.

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Acknowledgements

I am grateful to Dr. Shoichi Ando and Dr. Takeshi Hashimoto for their comments.

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Correspondence to Shigehiko Ogoh.

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Ogoh, S. Relationship between cognitive function and regulation of cerebral blood flow. J Physiol Sci 67, 345–351 (2017). https://doi.org/10.1007/s12576-017-0525-0

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