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Preininger MK, Zaytseva D, Lin JM, Kaufer D. Blood-brain barrier dysfunction promotes astrocyte senescence through albumin-induced TGFβ signaling activation. Aging Cell 2023; 22:e13747. [PMID: 36606305 PMCID: PMC9924950 DOI: 10.1111/acel.13747] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 08/22/2022] [Accepted: 11/06/2022] [Indexed: 01/07/2023] Open
Abstract
Blood-brain barrier dysfunction (BBBD) and accumulation of senescent astrocytes occur during brain aging and contribute to neuroinflammation and disease. Here, we explored the relationship between these two age-related events, hypothesizing that chronic hippocampal exposure to the blood-borne protein serum albumin could induce stress-induced premature senescence (SIPS) in astrocytes via transforming growth factor beta 1 (TGFβ) signaling. We found that 1 week of albumin exposure significantly increased TGFβ signaling and senescence marker expression in cultured rat hippocampal astrocytes. These changes were preventable by pharmacological inhibition of the type I TGFβ receptor (TGFβR) ALK5. To study these effects in vivo, we utilized an animal model of BBBD in which albumin was continuously infused into the lateral ventricles of adult mice. Consistent with our in vitro results, 1 week of albumin infusion significantly increased TGFβ signaling activation and the burden of senescent astrocytes in hippocampal tissue. Pharmacological inhibition of ALK5 TGFβR or conditional genetic knockdown of astrocytic TGFβR prior to albumin infusion was sufficient to prevent albumin-induced astrocyte senescence. Together, these results establish a link between TGFβ signaling activation and astrocyte senescence and suggest that prolonged exposure to serum albumin due to BBBD can trigger these phenotypic changes.
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Affiliation(s)
- Marcela K. Preininger
- Department of Integrative BiologyUniversity of California, BerkeleyBerkeleyCaliforniaUSA
- Department of Molecular and Cell BiologyUniversity of California, BerkeleyBerkeleyCaliforniaUSA
| | - Dasha Zaytseva
- Department of Integrative BiologyUniversity of California, BerkeleyBerkeleyCaliforniaUSA
- Department of BiologySan Francisco State UniversitySan FranciscoCaliforniaUSA
| | - Jessica May Lin
- Department of Integrative BiologyUniversity of California, BerkeleyBerkeleyCaliforniaUSA
| | - Daniela Kaufer
- Department of Integrative BiologyUniversity of California, BerkeleyBerkeleyCaliforniaUSA
- Helen Wills Neuroscience InstituteUniversity of California, BerkeleyBerkeleyCaliforniaUSA
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2
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North KC, Zhang M, Singh AK, Zaytseva D, Slayden AV, Bukiya AN, Dopico AM. Cholesterol inhibition of slo1 channels is Ca2+-dependent and can be mediated by either high-affinity Ca2+-sensing site in the slo1 cytosolic tail. Mol Pharmacol 2021; 101:132-143. [PMID: 34969832 DOI: 10.1124/molpharm.121.000392] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Accepted: 12/27/2021] [Indexed: 11/22/2022] Open
Abstract
Ca2+-/voltage-gated K+ channels of large conductance (BK) are expressed in the cell membranes of all excitable tissues. Currents mediated by BK channel-forming slo1 homotetramers are consistently inhibited by increases in membrane cholesterol (CLR). The molecular mechanisms leading to this CLR action, however, remain unknown. Slo1 channels are activated by increases in Ca2+ nearby Ca2+-recognition sites in the slo1 cytosolic tail: one high-affinity and one low-affinity sites locate to the Regulator of Conductance for K+ (RCK) 1 domain, while another high-affinity site locates within the RCK2 domain. Here we first evaluated the cross-talking between Ca2+ and CLR on the function of slo1 (cbv1 isoform) channels reconstituted into planar lipid bilayers. CLR robustly reduced channel open probability while barely decreasing unitary current amplitude, with CLR maximal effects being observed at 10-30 µM internal Ca2+ CLR actions were not only modulated by internal Ca2+ levels but also disappeared in absence of this divalent. Moreover, in absence of Ca2+, BK channel-activating concentrations of Mg2+ (10 mM) did not support CLR action. Next, we evaluated CLR actions on channels where the different Ca2+-sensing sites present in the slo1 cytosolic domain became nonfunctional via mutagenesis. CLR still reduced the activity of low-affinity Ca2+ (RCK1:E379A, E404A) mutants. In contrast, CLR became inefficacious when both high-affinity Ca2+ sites were mutated (RCK1:D367A,D372A, and RCK2:D899N,D900N,D901N,D902N,D903N), yet still was able to decrease the activity of each high-affinity site mutant. Therefore, BK channel inhibition by CLR selectively requires optimal levels of Ca2+ being recognized by either of the slo1 high-affinity Ca2+-sensing sites. Significance Statement Results reveal that the widely reported inhibition of BK (slo1) channels by membrane cholesterol requires a physiologically range of internal Ca2+ and is selectively linked to the two high-affinity Ca2+-sensing sites located in the cytosolic tail domain of slo1 proteins, which underscores that Ca2+ and cholesterol actions are allosterically coupled to the channel gate. Cholesterol modification of BK channel activity likely contributes to disruption of normal physiology by common health conditions that are triggered by disruption of cholesterol homeostasis.
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Affiliation(s)
| | - Man Zhang
- Shanghai Center for System Biomedicine, Shanghai Jiao Tong University, China
| | | | | | | | - Anna N Bukiya
- Pharmacology, The University of Tennessee Health Science Center, United States
| | - Alex M Dopico
- Pharmacology, Addiction Science and Toxicology, University of Tennessee Health Science Center, United States
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Zaytseva D, Allawala A, Franco JA, Putnam S, Abtahie AM, Bubalo N, Criddle CR, Nguyen TA, Nguyen P, Padmanabhan S, Sanghera P, Bremer M, Abramson T, Wilkinson KA. Lipopolysaccharide-induced inflammation does not alter muscle spindle afferent mechanosensation or sensory integration in the spinal cord of adult mice. Physiol Rep 2018; 6:e13812. [PMID: 30178608 PMCID: PMC6121120 DOI: 10.14814/phy2.13812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Revised: 06/25/2018] [Accepted: 07/05/2018] [Indexed: 11/24/2022] Open
Abstract
Inflammation is known to alter nervous system function, but its effect on muscle spindle afferent mechanosensation and sensory integration in the spinal cord has not been well studied. We tested the hypothesis that systemic inflammation induced by an intraperitoneal injection of the endotoxin lipopolysaccharide (LPS; 7.5 × 105 endotoxin units/kg 18 h before experiment) would alter muscle spindle afferent mechanosensation and spinal cord excitability to Group Ia input in male and female adult C57Bl/6 mice. LPS injection caused a systemic immune response, evidenced by decreased white blood cell, monocyte, and lymphocyte concentrations in the blood, increased blood granulocyte concentration, and body weight loss. The immune response in both sexes was qualitatively similar. We used an in vitro muscle-nerve preparation to assay muscle spindle afferent response to stretch and vibration. LPS injection did not significantly change the response to stretch or vibration, with the exception of small decreases in the ability to entrain to high-frequency vibration in male mice. Similarly, LPS injection did not alter spinal cord excitability to Group Ia muscle spindle afferent input as measured by the Hoffman's reflex test in anesthetized mice (100 mg/kg ketamine, 10 mg/kg xylazine). Specifically, there were no changes in M or H wave latencies nor in the percentage of motor neurons excited by electrical afferent stimulation (Hmax /Mmax ). Overall, we found no major alterations in muscle proprioceptor function or sensory integration following exposure to LPS at a dose and time course that causes changes in nociceptor function and central processing.
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Affiliation(s)
- Dasha Zaytseva
- Department of Biological SciencesSan José State UniversitySan JoseCalifornia
| | - Anusha Allawala
- Department of Biological SciencesSan José State UniversitySan JoseCalifornia
| | - Joy A. Franco
- Department of Biological SciencesSan José State UniversitySan JoseCalifornia
| | - Shea Putnam
- Department of Biological SciencesSan José State UniversitySan JoseCalifornia
| | - Adam M. Abtahie
- Department of Biological SciencesSan José State UniversitySan JoseCalifornia
| | - Nina Bubalo
- Department of Biological SciencesSan José State UniversitySan JoseCalifornia
| | - Connor R. Criddle
- Department of Biological SciencesSan José State UniversitySan JoseCalifornia
| | - Tuan A. Nguyen
- Department of Biological SciencesSan José State UniversitySan JoseCalifornia
- Abbvie BiotherapeuticsRedwood CityCalifornia
| | - Peter Nguyen
- Department of Biological SciencesSan José State UniversitySan JoseCalifornia
| | | | - Puneet Sanghera
- Department of Biological SciencesSan José State UniversitySan JoseCalifornia
| | - Martina Bremer
- Department of Mathematics & StatisticsSan José State UniversitySan JoseCalifornia
| | - Tzvia Abramson
- Department of Biological SciencesSan José State UniversitySan JoseCalifornia
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5
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Woo SH, Lukacs V, de Nooij JC, Zaytseva D, Criddle CR, Francisco A, Jessell TM, Wilkinson KA, Patapoutian A. Piezo2 is the principal mechanotransduction channel for proprioception. Nat Neurosci 2015; 18:1756-62. [PMID: 26551544 PMCID: PMC4661126 DOI: 10.1038/nn.4162] [Citation(s) in RCA: 333] [Impact Index Per Article: 37.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2015] [Accepted: 10/13/2015] [Indexed: 12/25/2022]
Abstract
Proprioception, the perception of body and limb position, is mediated by proprioceptors, specialized mechanosensory neurons that convey information about the stretch and tension experienced by muscles, tendons, skin and joints. In mammals, the molecular identity of the stretch-sensitive channel that mediates proprioception is unknown. We found that the mechanically activated nonselective cation channel Piezo2 was expressed in sensory endings of proprioceptors innervating muscle spindles and Golgi tendon organs in mice. Two independent mouse lines that lack Piezo2 in proprioceptive neurons showed severely uncoordinated body movements and abnormal limb positions. Moreover, the mechanosensitivity of parvalbumin-expressing neurons that predominantly mark proprioceptors was dependent on Piezo2 expression in vitro, and the stretch-induced firing of proprioceptors in muscle-nerve recordings was markedly reduced in Piezo2-deficient mice. Together, our results indicate that Piezo2 is the major mechanotransducer of mammalian proprioceptors.
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Affiliation(s)
- Seung-Hyun Woo
- Howard Hughes Medical Institute, Molecular and Cellular Neuroscience, Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, California, USA
| | - Viktor Lukacs
- Howard Hughes Medical Institute, Molecular and Cellular Neuroscience, Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, California, USA
| | - Joriene C de Nooij
- Howard Hughes Medical Institute, Department of Neuroscience, Columbia University, New York, New York, USA.,Howard Hughes Medical Institute, Department of Biochemistry and Molecular Biophysics, Columbia University, New York, New York, USA
| | - Dasha Zaytseva
- Department of Biological Sciences, San José State University, San Jose, California, USA
| | - Connor R Criddle
- Department of Biological Sciences, San José State University, San Jose, California, USA
| | - Allain Francisco
- Howard Hughes Medical Institute, Molecular and Cellular Neuroscience, Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, California, USA
| | - Thomas M Jessell
- Howard Hughes Medical Institute, Department of Neuroscience, Columbia University, New York, New York, USA.,Howard Hughes Medical Institute, Department of Biochemistry and Molecular Biophysics, Columbia University, New York, New York, USA
| | - Katherine A Wilkinson
- Department of Biological Sciences, San José State University, San Jose, California, USA
| | - Ardem Patapoutian
- Howard Hughes Medical Institute, Molecular and Cellular Neuroscience, Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, California, USA
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Shamai K, Nguyen P, Zaytseva D, Wilkinson K. Diet Induced Obesity Alters Muscle Spindle Afferent Function in Adult Male Mice. FASEB J 2015. [DOI: 10.1096/fasebj.29.1_supplement.818.10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Krystle Shamai
- Department of Biological SciencesSan Jose State UniversitySan JoseCAUnited States
| | - Peter Nguyen
- Department of Biological SciencesSan Jose State UniversitySan JoseCAUnited States
| | - Dasha Zaytseva
- Department of Biological SciencesSan Jose State UniversitySan JoseCAUnited States
| | - Katherine Wilkinson
- Department of Biological SciencesSan Jose State UniversitySan JoseCAUnited States
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Allawala A, Behnke S, Zaytseva D, Wilkinson K. Characterization of changes in muscle afferent response to stretch following inflammation in male and female mice (1128.1). FASEB J 2014. [DOI: 10.1096/fasebj.28.1_supplement.1128.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Anusha Allawala
- Biological Sciences San Jose State UniversitySan JoseCAUnited States
| | - Stephanie Behnke
- Biological Sciences San Jose State UniversitySan JoseCAUnited States
| | - Dasha Zaytseva
- Biological Sciences San Jose State UniversitySan JoseCAUnited States
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