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Yeh SH, Hsu FW, Chen KH, Chiang ER, Chang MC, Ma HL. Repairing Complete Radial Tears of the Lateral Meniscus: Arthroscopic All-Inside Double Vertical Cross-Suture Technique Is Effective and Safe With 2-Year Minimum Follow-Up. Arthroscopy 2022; 38:1919-1929. [PMID: 34838645 DOI: 10.1016/j.arthro.2021.11.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 11/08/2021] [Accepted: 11/12/2021] [Indexed: 02/02/2023]
Abstract
PURPOSE To assess the failure rate and clinical outcomes of the all-inside, double-vertical, cross-suture technique in repairing complete radial tears of the lateral meniscus. METHOD We retrospectively reviewed records of patients with this injury on whom the present technique was employed at our institution between 2011 and 2018, with at least 24 months of follow-up. Six months postoperatively, the meniscus healing and extrusion status were evaluated through magnetic resonance imaging. Preoperative and postoperative knee function, measured through IKDC, Lysholm knee, and Tegner activity scale scores, were compared. RESULTS In total, 27 patients underwent the procedure. The preoperative mean (standard deviation) IKDC score, Lysholm knee score, and Tegner activity scale scores were 53.4 ± 5.3, 63.2 ± 9.3, and 4 ± .7, respectively. At the last follow-up (≥24 months postoperatively), these scores increased to 92.1 ± 2.6, 90.8 ± 4.2, and 6.1 ± 1.3, respectively (all P < .05). Complete healing of the meniscus was observed in 23 patients, and 4 patients had meniscus retear or nonhealing. The overall retear or nonhealing rate was 14.8%. Healing rates between those with isolated radial tears (87.5%) and those with combined anterior cruciate ligament rupture (84.2%; P = .826) were comparable. No difference was observed in the progression of coronal and sagittal meniscus extrusion (P = .133 and .797, respectively). CONCLUSION In patients with complete radial tears of the lateral meniscus, the arthroscopic all-inside double vertical cross-suture repair technique resulted in an 85.2% healing rate, improvements in functional outcomes and activity levels, and no identifiable progression of meniscus extrusion. The all-inside double vertical cross-suture technique is effective and safe for the repair of radial tears of the meniscus. LEVEL OF EVIDENCE Level IV, retrospective case series.
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Affiliation(s)
- Shih-Han Yeh
- Department of Orthopaedics and Traumatology, Taipei Veterans General Hospital, Taipei, Taiwan; Department of Surgery, School of Medicine, National Yang-Ming University, Taipei, Taiwan; Department of Surgery, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan; Department of Orthopedic Surgery, Taoyuan General Hospital, Ministry of Health & Welfare, Taoyuan, Taiwan
| | - Fang-Wei Hsu
- Department of Orthopaedics and Traumatology, Taipei Veterans General Hospital, Taipei, Taiwan; Department of Orthopedic Surgery, Taoyuan General Hospital, Ministry of Health & Welfare, Taoyuan, Taiwan; Orthopedics Department of Kuang Tien General Hospital, Taichung, Taiwan
| | - Kun-Hui Chen
- Department of Orthopaedics and Traumatology, Taipei Veterans General Hospital, Taipei, Taiwan; Department of Surgery, School of Medicine, National Yang-Ming University, Taipei, Taiwan; Department of Surgery, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan; Department of Orthopedic Surgery, Taoyuan General Hospital, Ministry of Health & Welfare, Taoyuan, Taiwan
| | - En-Rung Chiang
- Department of Orthopaedics and Traumatology, Taipei Veterans General Hospital, Taipei, Taiwan; Department of Surgery, School of Medicine, National Yang-Ming University, Taipei, Taiwan; Department of Surgery, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan; Department of Orthopedic Surgery, Taoyuan General Hospital, Ministry of Health & Welfare, Taoyuan, Taiwan
| | - Ming-Chau Chang
- Department of Orthopaedics and Traumatology, Taipei Veterans General Hospital, Taipei, Taiwan; Department of Surgery, School of Medicine, National Yang-Ming University, Taipei, Taiwan; Department of Surgery, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan; Department of Orthopedic Surgery, Taoyuan General Hospital, Ministry of Health & Welfare, Taoyuan, Taiwan
| | - Hsiao-Li Ma
- Department of Orthopaedics and Traumatology, Taipei Veterans General Hospital, Taipei, Taiwan; Department of Surgery, School of Medicine, National Yang-Ming University, Taipei, Taiwan; Department of Surgery, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan; Department of Orthopedic Surgery, Taoyuan General Hospital, Ministry of Health & Welfare, Taoyuan, Taiwan.
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Tung KK, Hsu FW, Ou HC, Chen KH, Pan CC, Lu WX, Chin NC, Shih CM, Wu YC, Lee CH. The Morphological Changes in Adjacent Segments Amongst Patients Receiving Anterior and Oblique Lumbar Interbody Fusion: A Retrospective Study. J Clin Med 2021; 10:jcm10235533. [PMID: 34884235 PMCID: PMC8658535 DOI: 10.3390/jcm10235533] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Revised: 11/22/2021] [Accepted: 11/26/2021] [Indexed: 12/30/2022] Open
Abstract
Adjacent segment disease (ASD) is troublesome condition that has proved to be highly related to spinal malalignment after spinal surgery. Hence, we aimed to evaluate the morphological changes after anterior lumbar interbody fusion (ALIF) and oblique LIF (OLIF) to establish the differences between the two surgical methods in terms of possible ASD avoidance. Fifty patients, half of whom received ALIF while the other half received OLIF, were analyzed with image studies and functional outcomes during the pre-operative and post-operative periods, and 2 years after surgery. Image measurements obtained included spinal-pelvic parameters, index lordosis (IL), segmental lordosis (SL), anterior disc height (ADH), posterior disc height (PDH) and adjacent segment disc angle (ASDA). The ADH and PDH in the adjacent segment decreased in the two groups while OLIF showed greater decrease without radiological ASD noted at 2-year follow-up. Both groups showed an increase in IL after surgery while ALIF showed greater improvement. No statistical difference was identified in functional outcomes between LIFs. We suggest that both ALIF and OLIF can restore adequate lordosis and prevent ASD after surgery. However, it should be noted that patient selection remains crucial when making any decision involving which of the two methods to use.
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Affiliation(s)
- Kuan-Kai Tung
- Department of Orthopedics, Taichung Veterans General Hospital, Taichung 40705, Taiwan; (K.-K.T.); (K.-H.C.); (C.-C.P.); (N.-C.C.); (C.-M.S.); (Y.-C.W.)
| | - Fang-Wei Hsu
- Department of Orthopedics, Kuang Tien General Hospital, Taichung 433, Taiwan;
| | - Hsien-Che Ou
- Department of Medicine Education, Taipei Veterans General Hospital, Taipei 112201, Taiwan;
| | - Kun-Hui Chen
- Department of Orthopedics, Taichung Veterans General Hospital, Taichung 40705, Taiwan; (K.-K.T.); (K.-H.C.); (C.-C.P.); (N.-C.C.); (C.-M.S.); (Y.-C.W.)
- Department of Biomedical Engineering, Hung Kuang University, Taichung 433304, Taiwan
- Department of Computer Science and Information Engineering, Providence University, Taichung 43301, Taiwan
- Department of Nursing, Jen-Teh Junior College of Medicine, Nursing and Management, Miaoli 35664, Taiwan
| | - Chien-Chou Pan
- Department of Orthopedics, Taichung Veterans General Hospital, Taichung 40705, Taiwan; (K.-K.T.); (K.-H.C.); (C.-C.P.); (N.-C.C.); (C.-M.S.); (Y.-C.W.)
- Department of Rehabilitation Science, Jen-Teh Junior College of Medicine, Nursing and Management, Miaoli 35664, Taiwan
| | - Wen-Xian Lu
- Department of Orthopedics, Feng Yuan Hospital Ministry of Health and Welfare, Taichung 420, Taiwan;
| | - Ning-Chien Chin
- Department of Orthopedics, Taichung Veterans General Hospital, Taichung 40705, Taiwan; (K.-K.T.); (K.-H.C.); (C.-C.P.); (N.-C.C.); (C.-M.S.); (Y.-C.W.)
| | - Cheng-Min Shih
- Department of Orthopedics, Taichung Veterans General Hospital, Taichung 40705, Taiwan; (K.-K.T.); (K.-H.C.); (C.-C.P.); (N.-C.C.); (C.-M.S.); (Y.-C.W.)
- Department of Physical Therapy, Hung Kuang University, Taichung 433304, Taiwan
- PhD Degree Program of Biomedical Science and Engineering, College of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan
| | - Yun-Che Wu
- Department of Orthopedics, Taichung Veterans General Hospital, Taichung 40705, Taiwan; (K.-K.T.); (K.-H.C.); (C.-C.P.); (N.-C.C.); (C.-M.S.); (Y.-C.W.)
| | - Cheng-Hung Lee
- Department of Orthopedics, Taichung Veterans General Hospital, Taichung 40705, Taiwan; (K.-K.T.); (K.-H.C.); (C.-C.P.); (N.-C.C.); (C.-M.S.); (Y.-C.W.)
- College of Medicine, National Chung Hsing University, Taichung 40227, Taiwan
- Department of Food Science and Technology, Hung Kuang University, Taichung 433304, Taiwan
- Correspondence: ; Tel.: +886-4-23592525
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Tung KK, Wu YC, Chen KH, Pan CC, Lu WX, Chin NC, Shih CM, Hsu FW, Lee CH. The radiological outcome in lumbar interbody fusion among rheumatoid arthritis patients: a 20-year retrospective study. BMC Musculoskelet Disord 2021; 22:658. [PMID: 34353311 PMCID: PMC8344185 DOI: 10.1186/s12891-021-04531-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Accepted: 07/20/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Clinical outcomes amongst Rheumatoid Arthritis (RA) patients have shown satisfactory results being reported after lumbar surgery. The increased adoption of the interbody fusion technique has been due to a high fusion rate and less invasive procedures. However, the radiographic outcome for RA patients after receiving interbody fusion has scarcely been addressed in the available literature. METHODS Patients receiving interbody fusion including ALIF, OLIF, and TLIF were examined for implant cage motion and fusion status at two-year follow-up. Parameters for the index correction level including ADH, PDH, WI, SL, FW, and FH were measured and compared at pre-OP, post-OP, and two-year follow-up. RESULTS We enrolled 64 RA patients at 104 levels (mean 64.0 years old, 85.9% female) received lumbar interbody fusion. There were substantial improvement in ADH, PDH, WI, SL, FW, and FH after surgery, with both ADH and PDH having significantly dropped at two-year follow up. The OLIF group suffered from a higher subsidence rate with no significant difference in fusion rate when compared to TLIF. The fusion rate and subsidence rate for all RA patients was 90.4 and 28.8%, respectively. CONCLUSIONS We revealed the radiographic outcomes of lumbar interbody fusions towards symptomatic lumbar disease in RA patients with good fusion outcome despite the relative high subsidence rate amongst the OLIF group. Those responsible for intra-operative endplate management should be more cautious to avoid post-OP cage subsidence.
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Affiliation(s)
- Kuan-Kai Tung
- Department of Orthopedics, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Yun-Che Wu
- Department of Orthopedics, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Kun-Hui Chen
- Department of Orthopedics, Taichung Veterans General Hospital, Taichung, Taiwan.,Department of Biomedical Engineering, Hung Kuang University, Taichung, Taiwan.,Department of Computer Science and Information Engineering, Providence University, Taichung, Taiwan.,Department of Nursing, Jenteh Junior College of Medicine, Nursing and Management, Miaoli, Taiwan
| | - Chien-Chou Pan
- Department of Orthopedics, Taichung Veterans General Hospital, Taichung, Taiwan.,Department of Rehabilitation Science, Jenteh Junior College of Medicine, Nursing and Management, Miaoli, Taiwan
| | - Wen-Xian Lu
- Department of Orthopedics, Feng Yuan Hospital Ministry of Health and Welfare, Taichung, Taiwan
| | - Ning-Chien Chin
- Department of Orthopedics, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Cheng-Min Shih
- Department of Orthopedics, Taichung Veterans General Hospital, Taichung, Taiwan.,Department of Physical Therapy, Hung Kuang University, Taichung, Taiwan.,PhD Degree Program of Biomedical Science and Engineering, College of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
| | - Fang-Wei Hsu
- Department of Orthopedics, Kuang Tien General Hospital, Taichung, Taiwan
| | - Cheng-Hung Lee
- Department of Orthopedics, Taichung Veterans General Hospital, Taichung, Taiwan. .,National Chung Hsing University, Taichung, Taiwan. .,Department of Food Science and Technology, Hung Kuang University, Taichung, Taiwan.
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Martin LA, Hsu FW, Herd B, Gregg M, Sample H, Kaplan J. Executive functions in agenesis of the corpus callosum: Working memory and sustained attention in the BTBR inbred mouse strain. Brain Behav 2021; 11:e01933. [PMID: 33300691 PMCID: PMC7821616 DOI: 10.1002/brb3.1933] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 10/16/2020] [Accepted: 10/18/2020] [Indexed: 11/11/2022] Open
Abstract
INTRODUCTION Agenesis of the corpus callosum (AgCC) is characterized by the congenital partial or complete absence of the corpus callosum. Several strains of mice have been reported to carry AgCC, with the BTBR T+ Itpr3tf /J (BTBR) inbred mouse strain consistently showing a complete absence of the corpus callosum, as well as a variable reduction in the size of the hippocampal commissure. While much research has focused on the social deficits of the BTBR strain, little research on its cognitive behavior has been conducted. The goal of our study was to compare two facets of executive functioning, spatial working memory, and sustained attention between the BTBR and C57BL/6J (B6) strains. METHODS Spatial working memory was measured utilizing a delayed matching-to-position (DMTP) task and sustained attention was measured utilizing an operant task in which mice were trained to distinguish signal and nonsignal events. RESULTS Both the BTBR and B6 mice demonstrated a predictable decline in performance on the DMTP task as the delay interval increased and predictable increase in performance on the sustained attention task as the duration of the signal event increased. Although no significant differences were found between strains on the performance of these tasks, there was a significant difference in learning the association between lever pressing and food reward. Histological investigation confirmed the complete absence of commissural fibers from the corpus callosum, but also the hippocampal commissure, counter to a previous study. CONCLUSION The results suggest spatial working memory and sustained attention are unaffected by the absence of these commissural fibers alone.
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Affiliation(s)
- Loren A Martin
- Department of Graduate Psychology, Azusa Pacific University, Azusa, CA, USA
| | - Fang-Wei Hsu
- Department of Graduate Psychology, Azusa Pacific University, Azusa, CA, USA
| | - Brooke Herd
- Department of Graduate Psychology, Azusa Pacific University, Azusa, CA, USA
| | - Michael Gregg
- Department of Psychology, Azusa Pacific University, Azusa, CA, USA
| | - Hannah Sample
- Center for Next-Gen Precision Diagnostics, UCSF, San Francisco, CA, USA
| | - Jason Kaplan
- U.S. Department of Veterans Affairs, Coatesville, PA, USA
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Tsai SW, Ma HH, Hsu FW, Chou TFA, Chen KH, Chiang CC, Chen WM. Risk factors for refracture after plate removal for midshaft clavicle fracture after bone union. J Orthop Surg Res 2019; 14:457. [PMID: 31864405 PMCID: PMC6925412 DOI: 10.1186/s13018-019-1516-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Accepted: 12/11/2019] [Indexed: 12/20/2022] Open
Abstract
Background Open reduction and internal fixation (ORIF) with plates and screws is one of the treatment options for clavicle fractures. However, an additional operation for implant removal after union of the fracture is commonly performed due to a high incidence of hardware irritation. Despite union of the fracture, a subsequent refracture might occur after removal of the implant which requires additional surgeries for fixation. This study aims to determine the risk factors associated with refracture of the clavicle after hardware removal. Methods We retrospectively reviewed the medical records of 278 patients that were diagnosed with a midshaft clavicle fracture (male 190; female 88) that had (1) undergone ORIF of the clavicle with plates and (2) received a second operation for removal of hardware after solid union of the fracture between 2010 and 2017. Their mean age was 40.1 ± 15.1 years, and mean interval from fixation to plate removal was 12.5 ± 7.5 months. The patients were then divided into two groups based on the presence of refracture (n = 20) or without refracture (n = 258). We analyzed patient demographics, interval between fixation and implant removal, fracture classification (AO/OTA, Robinson), fixation device, whether wires or interfragmentary screws were used, clavicular length, and bone diameter at the fracture site. Results The overall refracture rate was 7.2%, and the mean interval between plate removal and refracture was 23.9 days. A multivariate analysis showed that female (adjusted odds ratio [aOR] 4.74; 95% CI 1.6–14.1) and body mass index [BMI] (for every 1-unit decrease, aOR 1.25; 95% CI 1.06–1.48) were risk factors for refracture. In women, BMI was the only risk factor. The optimal BMI cutoff value was 22.73. In a female patient with a lower BMI, the refracture rate was 29.8%. Conclusions There are no significant radiographic parameters associated with refracture. Routine plate removal in a female patient with a low BMI after bony union of a midshaft clavicle fracture is not recommended because of a high refracture rate.
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Affiliation(s)
- Shang-Wen Tsai
- Department of Orthopaedics and Traumatology, Taipei Veterans General Hospital, No. 201, Sec 2, Shi-Pai Road, Taipei, 112, Taiwan.,Department of Orthopaedics, School of Medicine, National Yang-Ming University, Taipei, Taiwan
| | - Hsuan-Hsiao Ma
- Department of Orthopaedics and Traumatology, Taipei Veterans General Hospital, No. 201, Sec 2, Shi-Pai Road, Taipei, 112, Taiwan.,Department of Orthopaedics, School of Medicine, National Yang-Ming University, Taipei, Taiwan
| | - Fang-Wei Hsu
- Department of Orthopaedics and Traumatology, Taipei Veterans General Hospital, No. 201, Sec 2, Shi-Pai Road, Taipei, 112, Taiwan.,Department of Orthopaedics, School of Medicine, National Yang-Ming University, Taipei, Taiwan.,Department of Orthopaedics, Kuang-Tien General Hospital, Taichung, Taiwan
| | - Te-Feng Arthur Chou
- Department of Orthopaedics and Traumatology, Taipei Veterans General Hospital, No. 201, Sec 2, Shi-Pai Road, Taipei, 112, Taiwan.,Department of Orthopaedics, School of Medicine, National Yang-Ming University, Taipei, Taiwan
| | - Kun-Hui Chen
- Department of Orthopaedics and Traumatology, Taipei Veterans General Hospital, No. 201, Sec 2, Shi-Pai Road, Taipei, 112, Taiwan. .,Department of Orthopaedics, School of Medicine, National Yang-Ming University, Taipei, Taiwan.
| | - Chao-Ching Chiang
- Department of Orthopaedics and Traumatology, Taipei Veterans General Hospital, No. 201, Sec 2, Shi-Pai Road, Taipei, 112, Taiwan.,Department of Orthopaedics, School of Medicine, National Yang-Ming University, Taipei, Taiwan
| | - Wei-Ming Chen
- Department of Orthopaedics and Traumatology, Taipei Veterans General Hospital, No. 201, Sec 2, Shi-Pai Road, Taipei, 112, Taiwan.,Department of Orthopaedics, School of Medicine, National Yang-Ming University, Taipei, Taiwan
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Sung KB, Shih KW, Hsu FW, Hsieh HP, Chuang MJ, Hsiao YH, Su YH, Tien GH. Accurate extraction of optical properties and top layer thickness of two-layered mucosal tissue phantoms from spatially resolved reflectance spectra. J Biomed Opt 2014; 19:77002. [PMID: 25027003 DOI: 10.1117/1.jbo.19.7.077002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Accepted: 06/17/2014] [Indexed: 05/11/2023]
Abstract
We are reporting on an experimental investigation of a movable diffuse reflectance spectroscopy system to extract diagnostically relevant optical properties of two-layered tissue phantoms simulating mucosae that are covered with stratified squamous epithelium. The reflectance spectra were measured at multiple sourcedetector separations using two imaging fiber bundles in contact with the phantoms, one with its optical axis perpendicular to the sample surface (perpendicular probe) and the other with its distal end beveled and optical axis tilted at 45 deg (oblique probe). Polystyrene microspheres and purified human hemoglobin were used to make tissue phantoms whose scattering and absorption properties could be well controlled and theoretically predicted. Monte Carlo simulations were used to predict the reflectance spectra for system calibration and an iterative curve fitting that simultaneously extracted the top layer reduced scattering coefficient, thickness, bottom layer reduced scattering coefficient, and hemoglobin concentration of the phantoms. The errors of the recovered parameters ranged from 7% to 20%. The oblique probe showed higher accuracy in the extracted top layer reduced scattering coefficient and thickness than the perpendicular probe. The developed system and data analysis methods provide a feasible tool to quantify the optical properties in vivo.
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Affiliation(s)
- Kung-Bin Sung
- National Taiwan University, Graduate Institute of Biomedical Electronics and Bioinformatics, No. 1 Sec. 4 Roosevelt Road, Taipei 10617, TaiwanbNational Taiwan University, Department of Electrical Engineering, No. 1 Sec. 4 Roosevelt Road, Taipei 10617, Tai
| | - Kuang-Wei Shih
- National Taiwan University, Graduate Institute of Biomedical Electronics and Bioinformatics, No. 1 Sec. 4 Roosevelt Road, Taipei 10617, Taiwan
| | - Fang-Wei Hsu
- National Taiwan University, Graduate Institute of Biomedical Electronics and Bioinformatics, No. 1 Sec. 4 Roosevelt Road, Taipei 10617, Taiwan
| | - Hong-Po Hsieh
- National Taiwan University, Graduate Institute of Biomedical Electronics and Bioinformatics, No. 1 Sec. 4 Roosevelt Road, Taipei 10617, Taiwan
| | - Min-Jie Chuang
- National Taiwan University, Graduate Institute of Biomedical Electronics and Bioinformatics, No. 1 Sec. 4 Roosevelt Road, Taipei 10617, Taiwan
| | - Yi-Hsien Hsiao
- National Taiwan University, Graduate Institute of Biomedical Electronics and Bioinformatics, No. 1 Sec. 4 Roosevelt Road, Taipei 10617, Taiwan
| | - Yu-Hui Su
- National Taiwan University, Graduate Institute of Biomedical Electronics and Bioinformatics, No. 1 Sec. 4 Roosevelt Road, Taipei 10617, Taiwan
| | - Gen-Hao Tien
- National Taiwan University, Graduate Institute of Biomedical Electronics and Bioinformatics, No. 1 Sec. 4 Roosevelt Road, Taipei 10617, Taiwan
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Tsao T, Fawcett J, Fervenza FC, Hsu FW, Huie P, Sibley RK, Rabkin R. Expression of insulin-like growth factor-I and transforming growth factor-beta in hypokalemic nephropathy in the rat. Kidney Int 2001; 59:96-105. [PMID: 11135062 DOI: 10.1046/j.1523-1755.2001.00470.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Potassium deficiency (KD) in the rat retards body growth but stimulates renal enlargement caused by cellular hypertrophy and hyperplasia, which is most marked in the outer medulla. If hypokalemia persists, interstitial infiltrates appear and eventually fibrosis. Since early in KD insulin-like growth factor-I (IGF-I) levels in the kidney are elevated, suggesting that it may be an early mediator of the exaggerated renal growth, and as transforming growth factor-beta (TGF-beta) promotes cellular hypertrophy and fibrosis, we examined the renal expression of these growth factors in prolonged KD. METHODS Rats were given a K-deficient diet or were pair fed or ad libitum fed a K-replete diet for 21 days. Growth factor mRNA levels were measured in whole kidney and protein expression localized by immunohistochemistry. RESULTS KD rats weighed less than pair-fed controls, while the kidneys were 49% larger. Their serum IGF-I and kidney IGF-I protein levels were depressed, as were their IGF-I mRNA levels in liver, kidney, and muscle. These changes can largely be attributed to decreased food intake. In contrast, kidney IGF binding protein-1 (IGFBP-1) mRNA and TGF-beta mRNA levels were increased significantly. Histology of outer medulla revealed marked hypertrophy and adenomatous hyperplasia of the collecting ducts and hypertrophy of the thick ascending limbs of Henle with cellular infiltrates in the interstitium. Both nephron segments immunostained strongly for IGF-I and IGFBP-1, but only the nonhyperplastic enlarged thick ascending Henle limb cells immunostained for TGF-beta, which was strongly positive. Prominent interstitial infiltrates with ED1 immunostained monocytes/macrophages were present. CONCLUSIONS These findings are consistent with a sustained role for IGF-I in promoting the exaggerated renal growth of KD and appear to be mediated through local trapping of IGF-I by the overexpressed IGFBP-1, which together with IGF-I can promote renal growth. The selective localization of TGF-beta to hypertrophied nonhyperplastic nephron segments containing IGF-I raises the possibility that TGF-beta may be serving to convert the mitogenic action of IGF-I into a hypertrophic response in these segments. It is also conceivable that TGF-beta may be a cause of the tubulointerstitial infiltrate. Finally, the low circulating IGF-I levels likely contribute to the impaired body growth.
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Affiliation(s)
- T Tsao
- Research Service Veterans Affairs Palo Alto Health Care System and Departments of Medicine and Pathology, Stanford University, Palo Alto, California, USA
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Fawcett J, Hsu FW, Tsao T, Rabkin R. Effect of metabolic acidosis on the insulin-like growth factor-I system and cathepsins B and L gene expression in the kidney. J Lab Clin Med 2000; 136:468-75. [PMID: 11128748 DOI: 10.1067/mlc.2000.110606] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Prolonged acidemia causes growth retardation and muscle wasting, in part because of reduced food intake, depressed growth hormone secretion, and low serum insulin-like growth factor-I (IGF-I) levels. Paradoxically, in the rat kidney, protein synthesis increases, cathepsin B and L activities decline, protein degradation falls, and the kidneys enlarge. Because IGF-I has been implicated as a cause of renal hypertrophy in a variety of conditions, we examined whether IGF-I could be playing a role in the renal hypertrophy of acidosis. Rats were gavaged with NH4Cl or water for 4 days. Water-gavaged rats either were pair-fed with the NH4Cl-loaded rats (pH 7.15) or were given free access to food and served as controls. After 2 days, kidney weight and IGF-I mRNA levels did not differ between the groups, but kidney IGF-I protein levels were significantly higher in the acidotic rats. After 4 days the kidneys of the acidotic rats were significantly larger than the kidneys in both control groups but the renal IGF-I levels did not differ between the groups. It is notable that renal cathepsin B and L mRNA levels were reduced by 30% to 50% at both times. Thus the transient increase in renal IGF-I protein levels in acidosis, before the onset of hypertrophy, suggests that IGF-I may play a role in initiating kidney growth. Furthermore, it appears that reduced cathepsin B and L gene expression is a cause of the low renal cathepsin activity seen in acidosis. This likely contributes to the depressed renal proteolysis caused by acidosis.
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Affiliation(s)
- J Fawcett
- Veterans Affairs Palo Alto Health Care System and the Department of Medicine, Stanford University, California, USA
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Fervenza FC, Hsu FW, Tsao T, Friedlaender MM, Rabkin R. Response to growth hormone therapy in experimental ischemic acute renal failure. J Lab Clin Med 1999; 133:434-9. [PMID: 10235126 DOI: 10.1016/s0022-2143(99)90020-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
In acute renal failure (ARF), the gene and peptide expression of insulin-like growth factor-I (IGF-I) falls. Because IGF-I is regulated by growth hormone (GH) and because kidney GH receptor expression is also attenuated in ARF, the impaired IGF-I expression may partly reflect local GH resistance. Because IGF-I treatment accelerates recovery from ARF, we determined whether high-dose GH therapy could overcome this putative GH resistance, stimulate IGF-I production, and enhance recovery. Rats with ARF were given 2.5 mg GH or vehicle (V) over 2 days, beginning 24 hours before the onset of ARF. GH prevented weight loss but did not modify the course of ARF. Next we determined whether the failure of GH to modify kidney recovery could reflect a failure to stimulate renal IGF-I gene expression. Rats were treated with GH or V over an 18-hour period beginning 1 day after the induction of ARF. Hepatic IGF-I mRNA and serum IGF-I peptide levels rose significantly with GH treatment, but the low kidney IGF-I mRNA levels did not respond. We conclude that the failure of GH to enhance recovery from ARF is caused by impaired GH-stimulated renal IGF-I production, while the maintenance of body weight likely reflects the systemic effects of the increase in hepatic IGF-I production.
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Affiliation(s)
- F C Fervenza
- Research Service, Veterans Affairs Palo Alto Health Care System, California 94304, USA
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Abstract
Potassium deficiency in the rat results in growth retardation, muscle wasting and renal hypertrophy. This study tests the thesis that K deficiency leads to tissue distinct changes in the local IGF-I system and cell sensitivity to IGF-I that favors renal enlargement on the one hand and impaired muscle growth on the other. In rats after eight days of K deficiency, compared to pair-fed control rats, food utilization and muscle and body wt gain were attenuated while the kidneys enlarged. In muscle GH receptor and IGF-I gene expression, IGF-I peptide and IGF binding protein-5 (IGFBP) levels were decreased. Together with reduced food utilization, these changes may contribute to the attenuated muscle growth. In the enlarged kidneys despite a fall in IGF-I mRNA level, IGF-I peptide concentration was increased more than twofold. This increase in IGF-I could be caused by the increase in kidney IGFBP-1 gene and protein expression and the decrease in kidney IGF-I degrading activity noted in K deficiency. Treatment with IGF-I failed to induce body or muscle growth, but induced a further increase in kidney size and enlargement of the spleen. Thus, in K deficiency the spontaneous increase in IGF-I levels in the kidney that is IGF-I sensitive may well be a cause of the renal hypertrophy.
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Affiliation(s)
- F W Hsu
- Department of Medicine, Stanford University, Palo Alto, California, USA
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Abstract
Following acute tubular necrosis (ATN), kidney plasma membrane insulin-like growth factor-I (IGF-I) receptor number increases markedly, although IGF-I receptor mRNA levels do not change. To determine whether this increase could represent a redistribution of intracellular receptors and whether receptor function is intact in acute uremia, rats with ATN of 2 days duration and pair-fed controls were studied. Skeletal muscle receptor binding was unchanged. In contrast, binding to receptors in solubilized cortex and isolated cortical plasma membranes increased significantly due to an increase in receptor number. However, the increase in membrane binding was threefold greater than the increase in solubilized cortex binding. This indicates that the increase in total cellular IGF-I receptors can only account for a minor portion of the increase in abundance of plasma membrane receptors number and is consistent with a redistribution of receptors from an intracellular to a membrane location as the major mechanism. Autophosphorylation and receptor kinase activity were unaffected by the uremia (blood urea nitrogen of approximately 198 mg/dl). Since these early steps of IGF-I receptor signaling are intact early in acute uremia, it is likely that at this time in the course of the disease the increase in receptor number will heighten the sensitivity to IGF-I and may thus favor its participation in renal repair.
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Affiliation(s)
- T Tsao
- Veterans Affairs Palo Alto Health Care System and Stanford University, California 94304, USA
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