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Quick isolation of rat medullary thick ascending limbs. Enzymatic and metabolic characterization
Abstract:
This paper describes a rapid and simple method for isolation of medullary thick ascending limbs (MTAL) from rat kidney. The technique takes advantage of the fact that MTAL represents a high fraction of the inner stripe (IS) tissue in the outer medulla, and that this nephron segment is more resistant than others to mechanical and enzymatic disruption. Special attention was given in the design of each step of the isolation procedure in order to improve purity and yield of the preparation. Major steps are the following: careful dissection of the IS; cutting IS tissue into small pieces of regular size (approximately equal to 1 mm3); mild and brief enzymatic hydrolysis in a 65 U/ml collagenase solution; separation of long MTAL segments from other tubule fragments and cells, and washing of the collagenase solution, on a nylon sieve (100 microns opening). This technique does not require lengthy centrifugations and provides about 6 mg fresh tissue (= 1 mg protein) from two rat kidneys in 2 h. Light microscopy and transmission electron microscopy show a good purity (at least 95%) and good preservation of TAL ultrastructural morphology. Adenylate cyclase responsiveness to arginine-vasopressin (AVP), glucagon (GLU) and salmon calcitonin (SCT) of the MTAL suspension is similar to that reported for single microdissected rat MTAL. Viability of the MTALs was demonstrated by the ability to accumulate cyclic AMP in presence of AVP, GLU, SCT and forskolin. Normal oxygen consumption was 45.1 +/- 2.4 (SEM) microliter . mg protein-1 . h-1 (n = 8).(ABSTRACT TRUNCATED AT 250 WORDS)
Insights
This study presents a quick and easy method to isolate medullary thick ascending limbs (MTAL) from rat kidneys, yielding pure and viable tissue for research. The technique ensures high purity and preserves ultrastructural morphology for functional studies.
Area of Science:
- Nephrology
- Renal Physiology
- Molecular Biology
Background:
- Studying the medullary thick ascending limb (MTAL) is crucial for understanding kidney function.
- Previous isolation methods were time-consuming and yielded less pure samples.
- A need existed for a rapid, high-yield, and pure method for MTAL isolation.
Purpose of the Study:
- To develop and describe a rapid and simple method for isolating medullary thick ascending limbs (MTAL) from rat kidneys.
- To ensure high purity and yield of isolated MTAL tissue.
- To validate the functional integrity and viability of the isolated MTALs.
Main Methods:
- Dissection of rat kidney inner stripe (IS) tissue.
- Mechanical disruption and mild enzymatic hydrolysis using collagenase.
- Separation of MTAL segments via nylon sieve filtration.
Main Results:
- The method yields approximately 6 mg of fresh MTAL tissue (1 mg protein) from two rat kidneys in 2 hours.
- Light and transmission electron microscopy confirmed high purity (≥95%) and excellent ultrastructural preservation.
- Isolated MTALs demonstrated preserved adenylate cyclase responsiveness to arginine-vasopressin, glucagon, and salmon calcitonin, and maintained viability.
Conclusions:
- This optimized technique provides a rapid, simple, and effective means for isolating pure and functional rat MTALs.
- The isolated MTALs are suitable for biochemical and physiological studies, including investigations of cyclic AMP production and oxygen consumption.
- The method's efficiency and the quality of the isolated tissue facilitate further research into renal transport mechanisms.