511 research outputs found
The Biophysical and Physiological Properties of TMEM150C and TMEM16H
νμλ
Όλ¬Έ (λ°μ¬) -- μμΈλνκ΅ λνμ : μ½νλν μ½νκ³Ό, 2020. 8. μ΄λ―Έμ₯.TMEM150C, also known as TTN3, is a cation channel which can be stimulated by mechanical stimulation. The inactivation of TTN3 is a slow adaptation (SA) MA type compared to the rapid inactivation mechanics of Piezo1 or Piezo2. It has previously been reported that TTN3 is expressed in muscle spindle afferents and mediates muscle coordination. Since TTN3 is a MA channel, I hypothesized that TTN3 may be involved in detecting blood pressure changes in baroreceptor. Here I show that TTN3 is expressed in the nerve endings of aortic arch and nodose ganglia (NG) neurons. Ttn3 KO promotes peripheral hypertension, tachycardia, large fluctuations in blood pressure, and impaired baroreceptor function. Chemogenetic silencing or stimulation of Ttn3 positive neurons in NG can cause an increase or decrease in blood pressure and heart rate, respectively. More importantly, overexpression of Ttn3 in Ttn3-/- mouse NG rescued cardiovascular changes in Ttn3-/- mice. My conclusion is that TTN3 is a molecular component that contributing to sensing the dynamic changes of blood pressure in baroreceptors.
TMEM16, also known as Anoctamin (ANO) gene family consists of ten isoforms. ANO1 and ANO2 are recognized as anion channels activated by Ca2+. ANO6 is a scramblase that destroys polarized phospholipids in the membrane. However, the function of TMEM16H (ANO8) is still unknown. Here I found that ANO8 is a cation channel activated by intracellular cAMP. Inward currents in ANO8 overexpressing HEK cells were observed when intracellular cAMP. The cAMP dependent currents were inhibited by a protein kinase-A inhibitor, which indicates that protein kinase A plays an active role in its activation mechanism. Cholera toxin, an activating agent of adenylate cyclase also activated ANO8. The currents in ANO8 expression cells induced by cAMP were cationic because they did not discriminate among cations. ANO8 is highly expressed in neurons in the brain regions as well as dorsal root ganglion (DRG) neurons. Knock down of Ano8 causes a decrease in cAMP dependent currents in DRG neurons as well as nociceptive behaviors in the formalin pain mice model. These results now suggest that ANO8 is a cation channel activated by the cAMP/pathway and involved in nociception in the pain pathway.TTN3μΌλ‘λ μλ €μ§ TMEM150Cλ κΈ°κ³μ μκ·Ήμ μν΄ νμ±ν λ μ μλ μμ΄μ¨ μ±λμ΄λ€. TTN3μ λΉνμ±νλ Piezo1 λλ Piezo2κ° λΉ λ₯΄κ² λΉνμ±ν λλ κ²κ³Ό λΉκ΅νμ¬ λλ¦¬κ² μΌμ΄λλ€. TTN3μ΄ κ·Όμ‘λ°©μΆμ ꡬμ¬μ±μ κ²½μμ λ°νλκ³ κ·Όμ‘ μ΄λμ μ‘°μ νλ κ²μΌλ‘ μ΄μ μ λ³΄κ³ λ λ° μλ€. κ·Έ μ΄ν, λ³Έ μ μλ TTN3μ΄ Baroreceptor ꡬμ¬μ±μ¬μ (Nodose ganglia, NG)μ μ κ²½μΈν¬μμ νμ νκ² λ°νλλ κ²μ λ°κ²¬νλ€. TTN3μ κΈ°κ³μ κ°κ°μ μν΄ λ°μνλ μ±λμ΄κΈ° λλ¬Έμ, TTN3μ΄ μλ ₯μμ©κΈ°κ° νμ λ³νλ₯Ό κ°μ§νλ λ° κ΄μ¬ ν μ μλ€λ κ°μ€μ μΈμ°κ³ μ€ννμλ€. μ΄ λ
Όλ¬Έμμ TTN3κ° λλλ§₯ κΆκ³Ό ꡬμ¬μ±μ¬μ λ΄λ°μ μ κ²½ λ§λ¨μμ λ°νλλ κ²μ νμΈνμλ€. Ttn3 KO μ₯μμ λ§μ΄ κ³ νμ, λΉλ§₯, νμμ ν° λ³λ λ±μ΄ μΌμ΄λκ³ , μλ ₯ μμ©κΈ°μ κΈ°λ₯μ΄ λ§κ°μ§ κ²μ νμΈλμλ€. Chemogeneticμ μ΄μ©νμ¬ Ttn3κ° λ°νλ NGμ λ΄λ°μ μ΅μ νΉμ μκ·Ή μν¬ λ, νμ λ° μ¬λ°μκ° μ¦κ° νΉμ κ°μλλ κ²μ νμΈνμλ€. λ, Ttn3 KO μ₯μ NGμμ Ttn3λ₯Ό λ€μ μ¬λ°νμν¨ κ²½μ°, KOμμ μΌμ΄λ¬λ μ¬νκ΄ λ³νκ° ν볡λμλ€. μ΄λ¬ν κ²°κ³Όλ‘ λ―Έλ£¨μ΄λ³Ό λ, λ³Έ λ
Όλ¬Έμ TTN3μ΄ μλ ₯μμ©μ²΄μμ νμμ λμ λ³νλ₯Ό κ°μ§νλ λ° μ€μνκ² κΈ°μ¬νλ€κ³ λ³΄κ³ νλ€.
μλ
Ήνλ―Ό (ANO) μ μ μ ν¨λ°λ¦¬λ‘λ μλ €μ§ TMEM16μ 10κ°μ μ΄μ±μ²΄λ‘ ꡬμ±λλ€. ANO1 λ° ANO2λ Ca2+μ μν΄ νμ±ν λλ μμ΄μ¨ μ±λμ΄λ€. ANO6λ λ§μμ λΆκ·Ήλ μΈμ§μ§μ νκ΄΄νλ μ§μ§ νκ΄΄ ν¨μλ‘ μλ €μ‘λ€. κ·Έλ¬λ μμ§κΉμ§ TMEM16H (ANO8)μ κΈ°λ₯μ λν΄μλ μλ €μ§μ§ μμλ€. μ΄ λ
Όλ¬Έμμ λ³Έ μ μλ ANO8/TMEM16Hκ° μΈν¬ λ΄ cAMPμ μν΄ νμ±ν λ μμ΄μ¨ μ±λμ΄λΌλ κ²μ λ°κ²¬νλ€. μΈν¬ λ΄ cAMPμ μν΄ ANO8κ° κ³Όλ°ν λ HEK μΈν¬μμ μ λ₯κ° μ λ°λμλ€. cAMP-μμ‘΄μ μ λ₯λ Protein kinase A μ΅μ μ μ μν΄ μ΅μ λλλ°, μ΄λ PKAκ° ANO8μ νμ±ν μν¨λ€λ κ²μ 보μ¬μ€λ€. Adenylyl cyclaseλ₯Ό νμ±νμν€λ μ½λ λΌ λ
μλ ANO8μ νμ±νμμΌ°λ€. cAMPμ μν΄ μ λ λ ANO8 λ°ν μΈν¬μ μ λ₯λ μμ΄μ¨μ΄μκ³ , μ΄λ μ νμ μΌλ‘ νΉμ μμ΄μ¨μ ν¬κ³Όμν€μ§λ μμλ€. ANO8μ λμμμ λ΄λ° λ° λ°°κ·Ό μ κ²½μ (DRG) λ΄λ°μμ κ³ λλ‘ λ°νλμ΄ μλ€. Ano8μ knockdownμ μν¨ κ²½μ°, ν¬λ₯΄λ§λ¦° ν΅μ¦ λ§μ°μ€ λͺ¨λΈμμ ν΅κ°μ΄ κ°μλκ³ , DRG λ΄λ°μμ cAMP- μμ‘΄μ μ λ₯μ κ°μλ μΌμ΄λ¬λ€. μ΄λ¬ν κ²°κ³Όλ ANO8μ΄ cAMP κ²½λ‘μ μν΄ νμ±νλκ³ ν΅μ¦ κ²½λ‘μμμ ν΅κ°μ κ΄μ¬νλ μμ΄μ¨ μ±λ μμ μμ¬νλ€.INTRODUCTION 1
1. Ion channels 1
1.1. Overview 1
1.2. Classification of ion channels 4
1.3. TMEM16 / Anoctamin Family 6
1.3.1. Overview 6
1.3.2. Physiology function of Anoctamins 8
1.3.2.1. ANO1 8
1.3.2.2 ANO2 9
1.3.2.3. ANO3 10
1.3.2.4. ANO5 10
1.3.2.5. ANO6 11
1.3.2.6. ANO9 12
1.3.2.7. ANO10 12
2. Baroreceptor reflex 13
2.1. Overview 13
2.2. Baroreflex pathway 17
2.3. Baroreceptors 19
3. Candidates for MA ion channels in Baroreceptor 20
3.1. Enac and Ascic2 20
3.2. TRPC5 23
3.3. TRPV1 24
3.4. Piezos channel 25
3.5. TMEM150c(TTN3) channel 29
4. Anoctamins in nociception 31
5. cAMP-PKA signaling pathway in DRG 32
PURPOSE OF THE STUDY 34
METHODS 35
1. Cell culture and transfection 35
2. Patch clamp 35
3. Mechanical stimulation 36
4. Animals and Ttn3cre mice 37
5. Immunofluorescence 39
6. RT-PCR 40
7. Dil-labeling of aortic BR neurons 41
8. Primary culture of NG or DRG neurons 42
9. Tissue clearing and staining 43
10. Recoding of aortic depressor nerve activity 44
11. 24-hour recoding of blood pressure and heart rate 46
12. Whole-body plethymography test 46
13. Baroreflex response test 47
14. Chemogenetic inhibition or acitvation of TTN3+ neurons 47
15. SiRNA 48
16. AAV infection of nodose ganglion or DRG 49
17. Formalin induced pain beavioral test 50
18. c-Fos immune-postive neurons counting 50
19. Statistical analysis 51
RESULTS 52
1. TTN3 expresses in baroreceptor neurons 52
2. TTN3 is responsible for SA MA currents in baroreceptor 55
3. TTN3 is expressed on AND in the aortic arch 58
4. TTN3 is required for pressure-evoked action potentials 61
5. TTN3-/- mice show hypertension and AP instability 65
6. Ttn3-/- mice shows normal locomotor activity 66
7. Ttn3-/- mice shows normal respiratiory functions 69
8. Ttn3 ablation impairs baroreflex sensitiveity 71
9. Overexpression of TTN3 in NG of Ttn3-/- mice rescues the impaired baroreceptor in Ttn3-/- mice 73
10. Chemogenetic inhibition or stimulation of TTN3+ neurons in NG induces hypertension or hypotension, respectively 76
11. ANO8 was localized in plasma membrane 79
12. ANO8 is activated by intracellular cAMP 81
13. ANO8 is a cation channel and not sensitive to voltage 83
14. Intracellular Calcium enhances CAMP-induced current 85
15. ANO8 is highly expressed in cortex, brainstem, cerebellum spinal cord and dorsal-root ganglia 87
16. ANO8 antibody specific confirm 90
17. ANO8 is highly expressed in nociceptive neurons 92
18. ANO8 confers cAMP-dependent channl current in DRG 94
19. ANO8 mediates pain sensitivity in nociceptive pain model 96
20. ANO8 knock-down reduces acitvities of dorsal horn neurons 99
DISCUSSION 101
1. The role of TMEM150C in baroreceptor function. 101
2. The role of TMEM16H in Nociceptive function 107
REFERENCES 112
κ΅λ¬Έμ΄λ‘ 123Docto
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