{"count":5,"limit":50,"offset":0,"edits":[{"id":4978,"actor_id":null,"entity_type":"hypothesis","entity_id":"h-var-6e963ed4e6","action":"update","diff_json":{"after":"8033b8f2eb101067a4c7d32b05ccbf78270fa03b975b9252e1eef4b16d37202d","before":"ef6259148f85dfa5388f905ab90b6e5ebd8f008638693c694f4e668411a0b0ee"},"change_reason":"enrich EC-II vulnerability hypotheses with evidence addenda","created_at":"2026-04-21T02:54:50.595930+00:00"},{"id":4979,"actor_id":null,"entity_type":"hypothesis","entity_id":"h-var-6e963ed4e6","action":"update","diff_json":{"after":"## Molecular Mechanism and Rationale\n\nSomatostatin-positive (SST+) interneurons in entorhinal cortex layers II-III provide dendritic inhibition that controls excitatory integration and theta-gamma coupling through precise regulation of hyperpolarization-activated cyclic nucleotide-gated (HCN) channels on stellate cell dendrites. In Alzheimer's disease, hyperphosphorylated tau directly binds to and disrupts HCN1 channel trafficking and membrane insertion in SST interneuron dendrites, leading to altered h-current density and compromised dendritic excitability. This tau-HCN1 interaction results in impaired dendritic integration, disrupted theta resonance, and aberrant gamma coupling that underlies spatial navigation deficits. Unlike perisomatic PV interneuron dysfunction, SST interneuron impairment specifically affects the dendritic computation necessary for grid cell firing patterns and temporal sequence encoding.\n\n## Preclinical Evidence\n\nTransgenic AD mouse models show selective SST interneuron vulnerability with co-localization of tau aggregates and reduced HCN1 immunoreactivity in entorhinal dendrites. Patch-clamp recordings reveal decreased h-current amplitude, altered resonance frequency, and impaired theta-frequency membrane oscillations in SST cells from P301S and 3xTg-AD mice. Local field potential recordings demonstrate disrupted theta-gamma phase-amplitude coupling specifically during spatial exploration, correlating with grid cell firing irregularities and impaired path integration. Pharmacological HCN channel enhancement or selective SST interneuron optogenetic activation can restore theta resonance and improve spatial memory performance.\n\n## Therapeutic Strategy\n\nClosed-loop tACS targeting entorhinal SST networks would monitor theta oscillations and deliver synchronized gamma stimulation to enhance dendritic integration during active navigation. Real-time detection of movement-related theta would trigger precisely timed gamma-frequency stimulation to restore proper theta-gamma coupling. Combination therapy with HCN channel positive modulators could synergistically enhance dendritic excitability and theta resonance in remaining functional SST interneurons.\n\n## Evidence enrichment addendum: ecii-sst-hcn-dendritic-integration\n\n        ### Mechanistic focus\n        SST dendritic inhibition, HCN1-mediated theta resonance, and stellate-cell integration.\n\n\nThe shared evidence base for this EC layer II vulnerability family is now\nstronger than a generic \"entorhinal dysfunction\" claim. Neuropathology and\nsingle-cell evidence both place transentorhinal and entorhinal circuits at the\nfront of the Alzheimer cascade: Braak staging identified early neurofibrillary\nchange in these regions, modern tau-seeding work shows seeding activity can\nbegin in transentorhinal/entorhinal tissue before widespread cortical spread,\nand recent human cell-type profiling reports layer II entorhinal neurons as a\nselectively vulnerable population at the onset of AD neuropathology (PMID:\n39435008; PMID: 39803521). A 2023 review of entorhinal cortex dysfunction in AD\nalso links medial and lateral EC layer 2 output neurons to the perforant and\ntemporoammonic paths that feed dentate gyrus, CA3, and CA1, making EC-II a\nplausible upstream control point rather than a downstream bystander (PMID:\n36513524). In an EC-tau mouse model, tau pathology was sufficient to produce\nexcitatory neuron loss, degraded grid-cell tuning, altered network activity, and\nspatial memory deficits reminiscent of early AD (PMID: 28111080). The\nneuromodulation branch of this task is additionally supported by 40 Hz gamma\nentrainment studies: optogenetic or sensory gamma stimulation altered amyloid\nburden and microglial state in AD models (PMID: 27929004), and early feasibility\nclinical studies show that noninvasive gamma stimulation can entrain human\nneural activity with acceptable short-term tolerability while leaving efficacy\nas an open question (PMID: 34027028; PMID: 30155285).\n\nThe implication for SciDEX scoring is that EC-II hypotheses should be evaluated\non three separable axes: first, whether the proposed target maps to a layer II\ncell type or projection that is actually vulnerable in AD; second, whether the\nintervention can shift the network state without causing hyperexcitability,\nseizure risk, or nonspecific arousal; and third, whether the readout captures\nearly circuit rescue rather than only late global cognition. Strong support\nwould therefore require convergent biomarkers: tau or p-tau217 to confirm\ndisease stage, high-resolution structural or functional imaging of EC and\nhippocampal subfields, EEG/MEG evidence for theta-gamma coupling or gamma power\nchanges, and a behavioral assay sensitive to path integration, mnemonic\nseparation, or spatial remapping. Weak support would be any result that improves\na broad cognitive endpoint without demonstrating EC engagement, because such a\nsignal could come from attention, sleep, mood, or generalized cortical\nactivation rather than the specific layer II mechanism.\n\n\n        ### Hypothesis-specific interpretation\n        This hypothesis is compelling because HCN1 channels are central to resonance properties in entorhinal stellate networks, while SST interneurons shape dendritic input windows. The intervention should therefore be scored as a circuit-parameter rescue: restoring theta resonance and nested gamma timing may normalize grid and path-integration codes without requiring broad neuroprotection.\n\n        ### Validation path\n        Measure HCN1 localization/function, dendritic calcium events, theta resonance, and grid-cell remapping in preclinical AD models; pair stimulation with p-tau and synaptic integrity markers.\n\n        ### Counterevidence and market caveats\n        The key uncertainty is directionality. Both excessive and insufficient HCN current can impair resonance, so the proposal needs bidirectional physiology rather than assuming more activation is always beneficial. A reasonable Exchange price should increase only when\n        EC engagement, cell-type specificity, and disease-stage matching are\n        demonstrated together. The most informative near-term experiment is a\n        staged design that first confirms the circuit target in an ex vivo or\n        animal model, then tests a closed-loop intervention with blinded\n        oscillatory, pathology, and behavioral endpoints. This keeps the claim\n        falsifiable: failure to engage EC-II physiology, failure to alter tau or\n        amyloid-linked pathology, or benefit that disappears under sham-controlled\n        stimulation would all materially weaken the hypothesis.\n","before":"## Molecular Mechanism and Rationale\n\nSomatostatin-positive (SST+) interneurons in entorhinal cortex layers II-III provide dendritic inhibition that controls excitatory integration and theta-gamma coupling through precise regulation of hyperpolarization-activated cyclic nucleotide-gated (HCN) channels on stellate cell dendrites. In Alzheimer's disease, hyperphosphorylated tau directly binds to and disrupts HCN1 channel trafficking and membrane insertion in SST interneuron dendrites, leading to altered h-current density and compromised dendritic excitability. This tau-HCN1 interaction results in impaired dendritic integration, disrupted theta resonance, and aberrant gamma coupling that underlies spatial navigation deficits. Unlike perisomatic PV interneuron dysfunction, SST interneuron impairment specifically affects the dendritic computation necessary for grid cell firing patterns and temporal sequence encoding.\n\n## Preclinical Evidence\n\nTransgenic AD mouse models show selective SST interneuron vulnerability with co-localization of tau aggregates and reduced HCN1 immunoreactivity in entorhinal dendrites. Patch-clamp recordings reveal decreased h-current amplitude, altered resonance frequency, and impaired theta-frequency membrane oscillations in SST cells from P301S and 3xTg-AD mice. Local field potential recordings demonstrate disrupted theta-gamma phase-amplitude coupling specifically during spatial exploration, correlating with grid cell firing irregularities and impaired path integration. Pharmacological HCN channel enhancement or selective SST interneuron optogenetic activation can restore theta resonance and improve spatial memory performance.\n\n## Therapeutic Strategy\n\nClosed-loop tACS targeting entorhinal SST networks would monitor theta oscillations and deliver synchronized gamma stimulation to enhance dendritic integration during active navigation. Real-time detection of movement-related theta would trigger precisely timed gamma-frequency stimulation to restore proper theta-gamma coupling. Combination therapy with HCN channel positive modulators could synergistically enhance dendritic excitability and theta resonance in remaining functional SST interneurons."},"change_reason":"enrich EC-II vulnerability hypotheses with evidence addenda","created_at":"2026-04-21T02:54:50.595930+00:00"},{"id":4980,"actor_id":null,"entity_type":"hypothesis","entity_id":"h-var-6e963ed4e6","action":"update","diff_json":{"after":0.78,"before":1.0},"change_reason":"enrich EC-II vulnerability hypotheses with evidence addenda","created_at":"2026-04-21T02:54:50.595930+00:00"},{"id":4981,"actor_id":null,"entity_type":"hypothesis","entity_id":"h-var-6e963ed4e6","action":"update","diff_json":{"after":"2026-04-20 19:54:50.595930-07:00","before":"2026-04-16 15:06:36.818587-07:00"},"change_reason":"enrich EC-II vulnerability hypotheses with evidence addenda","created_at":"2026-04-21T02:54:50.595930+00:00"},{"id":4982,"actor_id":null,"entity_type":"hypothesis","entity_id":"h-var-6e963ed4e6","action":"update","diff_json":{"after":"'2':450 '2023':435 '27929004':546 '28111080':515 '30155285':578 '34027028':576 '36513524':481 '39435008':431 '39803521':433 '3xtg':199 '3xtg-ad':198 '40':526 'aberr':116 'accept':563 'activ':59,238,272,397,505,561,730,853 'actual':613 'ad':24,150,200,428,442,513,543,616,813 'addendum':320 'addit':523 'affect':133 'aggreg':164 'also':443 'alter':93,182,503,536,931 'alway':855 'alzheim':71,379 'amplitud':181,213 'amyloid':537,935 'amyloid-link':934 'anim':901 'arous':633 'assay':691 'assum':851 'attent':724 'axe':596 'base':345 'begin':399 'behavior':690,915 'benefici':856 'benefit':939 'bidirect':847 'bind':77 'biomark':655 'blind':911 'braak':381 'branch':518 'broad':710,794 'burden':538 'bystand':479 'ca1':465 'ca3':463 'calcium':802 'captur':639 'cascad':380 'caus':627 'caveat':828 'cell':68,140,194,222,340,366,411,501,607,809,868,979 'cell-typ':410,867 'central':750 'chang':386,687 'channel':21,65,82,231,302,748 'circuit':373,641,774,894 'circuit-paramet':773 'claim':361,920 'clamp':174 'clinic':550 'close':2,251,907 'closed-loop':1,250,906 'co':160 'co-loc':159 'code':791 'cognit':648,711 'combin':298 'come':722 'compel':745 'compromis':99 'comput':136 'confirm':662,892 'control':45,473,945,969 'converg':654 'correl':219 'cortex':36,439,955 'cortic':405,729 'could':305,721 'counterevid':825 'coupl':52,118,214,297,683,976 'current':96,180,839 'cyclic':60 'decreas':177 'deficit':123,509 'degrad':498 'deliv':263 'demonstr':206,714,877 'dendrit':13,42,69,90,100,110,135,171,269,308,325,330,762,801,961,970 'densiti':97 'dentat':461 'design':889 'detect':277 'direct':76,833 'disappear':941 'diseas':73,663,873 'disease-stag':872 'disrupt':80,112,207 'downstream':478 'dysfunct':22,128,360,440 'earli':384,512,548,640 'ec':7,348,448,468,485,587,673,715,865,926 'ec-ii':6,467,586,925 'ec-tau':484 'ecii':322 'ecii-sst-hcn-dendritic-integr':321 'eeg/meg':677 'efficaci':570 'encod':146 'endpoint':712,916 'engag':716,866,924 'enhanc':232,268,307 'enrich':319 'entorhin':35,170,255,359,372,417,438,755,954 'entrain':529,558 'evalu':592 'event':803 'evid':148,318,344,367,678 'ex':898 'excess':835 'exchang':859 'excit':101,309 'excitatori':46,495 'experi':885 'explor':218 'failur':922,929 'falsifi':921 'famili':352 'feasibl':549 'feed':460 'field':203 'fire':141,223 'first':597,891 'focus':328 'frequenc':184,189,289 'front':376 'function':315,670 'gamma':51,117,210,265,288,296,528,534,555,682,685,782,975 'gamma-frequ':287 'gate':63 'general':728 'generic':358 'global':647 'grid':139,221,500,786,808 'grid-cel':499,807 'gyrus':462 'h':95,179 'h-current':94,178 'hcn':20,64,230,301,324,838 'hcn1':81,105,167,333,747,799,965 'hcn1-mediated':332,964 'high':666 'high-resolut':665 'hippocamp':675 'human':409,559 'hyperexcit':628 'hyperphosphoryl':74 'hyperpolar':58 'hyperpolarization-activ':57 'hypothes':589 'hypothesi':739,743,952 'hypothesis-specif':738 'hz':527 'identifi':383 'ii':8,39,350,416,469,588,606,736,927,957 'ii-iii':38 'iii':40,958 'imag':671 'immunoreact':168 'impair':109,131,186,226,841 'implic':580 'improv':244,708 'increas':862 'inform':881 'inhibit':43,331,962 'input':763 'insert':86 'insuffici':837 'integr':14,47,111,228,270,326,341,695,790,823,971 'interact':106 'interneuron':10,33,89,127,130,156,236,317,760,960 'interpret':741 'intervent':620,766,909 'irregular':224 'keep':918 'key':830 'late':646 'later':447 'layer':37,349,415,449,605,735,956 'lead':91 'leav':569 'link':444,936 'local':161,202 'localization/function':800 'loop':3,252,908 'loss':497 'make':466 'map':602 'marker':824 'market':827 'match':875 'materi':949 'may':784 'measur':798 'mechan':26,737 'mechanist':327 'medial':445 'mediat':19,334,966 'membran':85,190 'memori':246,508 'mice':201 'microgli':540 'mnemon':696 'model':152,488,544,814,902 'modern':390 'modul':304 'molecular':25 'monitor':259 'mood':726 'mous':151,487 'movement':280 'movement-rel':279 'navig':122,273 'near':883 'near-term':882 'necessari':137 'need':846 'nest':781 'network':257,504,624,757,980 'neural':560 'neurofibrillari':385 'neuromodul':517 'neuron':418,452,496 'neuropatholog':362,429 'neuroprotect':795 'noninvas':554 'nonspecif':632 'normal':785 'nucleotid':62 'nucleotide-g':61 'onset':426 'open':573 'optogenet':237,531 'oscil':191,261 'oscillatori':912 'output':451 'p':659,819 'p-tau':818 'p-tau217':658 'p301s':196 'pair':815 'paramet':775 'patch':173 'patch-clamp':172 'path':227,458,694,789,797 'path-integr':788 'patholog':490,913,937 'pattern':142 'perfor':455 'perform':247 'perisomat':125 'pharmacolog':229 'phase':212 'phase-amplitud':211 'physiolog':848,928 'place':369 'plausibl':471 'pmid':430,432,480,514,545,575,577 'point':474 'popul':423 'posit':31,303 'potenti':204 'power':686 'precis':54,285 'preclin':147,812 'prevent':16 'price':860 'produc':494 'profil':413 'project':610 'proper':293 'properti':753 'propos':600,845 'provid':41 'pv':126 'question':574 'rather':475,643,731,849 'rational':28 'readout':638 'real':275 'real-tim':274 'reason':858 'recent':408 'record':175,205 'reduc':166 'region':389 'regul':55 'relat':281 'remain':314 'remap':700,810 'reminisc':510 'report':414 'requir':653,793 'rescu':642,776 'resolut':667 'reson':114,183,242,312,336,752,779,805,842,968 'restor':12,240,292,777 'result':107,706 'reveal':176 'review':436 'risk':630 'scidex':582 'score':583,770 'second':617 'seed':393,396 'seizur':629 'select':154,234,421 'sensit':692 'sensori':533 'separ':595,697 'sequenc':145 'sham':944 'sham-control':943 'shape':761 'share':343 'shift':622 'short':565 'short-term':564 'show':153,395,552 'signal':720 'singl':365 'single-cel':364 'sleep':725 'somatostatin':9,30 'somatostatin-posit':29 'spatial':121,217,245,507,699 'specif':132,215,734,740,870 'spread':406 'sst':32,88,129,155,193,235,256,316,323,329,759,953,959 'stage':382,664,874,888 'state':541,625 'stellat':67,339,756,978 'stellate-cel':338 'stimul':266,290,535,556,816,946 'strategi':249 'strong':649 'stronger':355 'structur':668 'studi':530,551 'subfield':676 'suffici':492 'support':524,650,702 'synapt':822 'synchron':264 'synergist':306 'tac':4,253 'target':5,254,601,895 'task':521 'tau':18,75,104,163,392,486,489,656,820,932 'tau-hcn1':103 'tau-medi':17 'tau-seed':391 'tau217':660 'tempor':144 'temporoammon':457 'term':566,884 'test':904 'therapeut':248 'therapi':299 'therefor':652,768 'theta':50,113,188,209,241,260,282,295,311,335,681,778,804,967,974 'theta-frequ':187 'theta-gamma':49,208,294,680,973 'third':635 'three':594 'time':276,286,783 'tissu':402 'togeth':878 'toler':567 'traffick':83 'transentorhin':370 'transentorhinal/entorhinal':401 'transgen':149 'trigger':284 'tune':502 'type':412,608,869 'uncertainti':831 'under':120 'unlik':124 'upstream':472 'valid':796 'vivo':899 'vulner':157,351,422,614 'weak':701 'weaken':950 'whether':598,618,636 'widespread':404 'window':764 'without':626,713,792 'work':394 'would':258,283,651,703,947","before":"'3xtg':199 '3xtg-ad':198 'aberr':116 'activ':59,238,272 'ad':24,150,200 'affect':133 'aggreg':164 'alter':93,182 'alzheim':71 'amplitud':181,213 'bind':77 'cell':68,140,194,222,344 'channel':21,65,82,231,302 'clamp':174 'close':2,251 'closed-loop':1,250 'co':160 'co-loc':159 'combin':298 'compromis':99 'comput':136 'control':45,334 'correl':219 'cortex':36,320 'could':305 'coupl':52,118,214,297,341 'current':96,180 'cyclic':60 'decreas':177 'deficit':123 'deliv':263 'demonstr':206 'dendrit':13,42,69,90,100,110,135,171,269,308,326,335 'densiti':97 'detect':277 'direct':76 'diseas':73 'disrupt':80,112,207 'dysfunct':22,128 'ec':7 'ec-ii':6 'encod':146 'enhanc':232,268,307 'entorhin':35,170,255,319 'evid':148 'excit':101,309 'excitatori':46 'explor':218 'field':203 'fire':141,223 'frequenc':184,189,289 'function':315 'gamma':51,117,210,265,288,296,340 'gamma-frequ':287 'gate':63 'grid':139,221 'h':95,179 'h-current':94,178 'hcn':20,64,230,301 'hcn1':81,105,167,330 'hcn1-mediated':329 'hyperphosphoryl':74 'hyperpolar':58 'hyperpolarization-activ':57 'ii':8,39,322 'ii-iii':38 'iii':40,323 'immunoreact':168 'impair':109,131,186,226 'improv':244 'inhibit':43,327 'insert':86 'integr':14,47,111,228,270,336 'interact':106 'interneuron':10,33,89,127,130,156,236,317,325 'irregular':224 'layer':37,321 'lead':91 'local':161,202 'loop':3,252 'mechan':26 'mediat':19,331 'membran':85,190 'memori':246 'mice':201 'model':152 'modul':304 'molecular':25 'monitor':259 'mous':151 'movement':280 'movement-rel':279 'navig':122,273 'necessari':137 'network':257,345 'nucleotid':62 'nucleotide-g':61 'optogenet':237 'oscil':191,261 'p301s':196 'patch':173 'patch-clamp':172 'path':227 'pattern':142 'perform':247 'perisomat':125 'pharmacolog':229 'phase':212 'phase-amplitud':211 'posit':31,303 'potenti':204 'precis':54,285 'preclin':147 'prevent':16 'proper':293 'provid':41 'pv':126 'rational':28 'real':275 'real-tim':274 'record':175,205 'reduc':166 'regul':55 'relat':281 'remain':314 'reson':114,183,242,312,333 'restor':12,240,292 'result':107 'reveal':176 'select':154,234 'sequenc':145 'show':153 'somatostatin':9,30 'somatostatin-posit':29 'spatial':121,217,245 'specif':132,215 'sst':32,88,129,155,193,235,256,316,318,324 'stellat':67,343 'stimul':266,290 'strategi':249 'synchron':264 'synergist':306 'tac':4,253 'target':5,254 'tau':18,75,104,163 'tau-hcn1':103 'tau-medi':17 'tempor':144 'therapeut':248 'therapi':299 'theta':50,113,188,209,241,260,282,295,311,332,339 'theta-frequ':187 'theta-gamma':49,208,294,338 'time':276,286 'traffick':83 'transgen':149 'trigger':284 'under':120 'unlik':124 'vulner':157 'would':258,283"},"change_reason":"enrich EC-II vulnerability hypotheses with evidence addenda","created_at":"2026-04-21T02:54:50.595930+00:00"}]}